Constraining the dark fluid (2009)
Kunz, Martin, Liddle, Andrew R, Parkinson, David, Gao, Changjun
Cosmological observations are normally fit under the assumption that the dark sector can be decomposed into dark matter and dark energy components. However, as long as the probes remain purely...
Parkinson, David, Kunz, Martin, Liddle, Andrew R., Bassett, Bruce A., Nichol, Robert C., Vardanyan, Mihran
We extend our study of the optimization of large baryon acoustic oscillation (BAO) surveys to return the best constraints on the dark energy, building on Paper I of this series (Parkinson et al....
Viable inflationary models ending with a first-order phase transition (2009)
Cortês, Marina, Liddle, Andrew R.
We investigate the parameter space of hybrid inflation models where inflation terminates via a first-order phase transition causing nucleation of bubbles. Such models experience a tension from the...
Oscillations in the inflaton potential? (2009)
Pahud, Cédric, Kamionkowski, Marc, Liddle, Andrew R.
We consider a class of inflationary models with small oscillations imprinted on an otherwise smooth inflaton potential. These oscillations are manifest as oscillations in the power spectrum of...
Statistical methods for cosmological parameter selection and estimation (2009)
The estimation of cosmological parameters from precision observables is an important industry with crucial ramifications for particle physics. This article discusses the statistical methods presently...
Hilton, Matt, Stanford, S. Adam, Stott, John P., Collins, Chris A., Hoyle, Ben, Davidson, Michael, ...
We present a study of the morphological fractions and color-magnitude relation in the most distant X-ray selected galaxy cluster currently known, XMMXCS J2215.9-1738 at z=1.46, using a combination of...
Observational constraints on thawing quintessence models (2008)
Clemson, Timothy G, Liddle, Andrew R
We use a dynamical systems approach to study thawing quintessence models, using a multi-parameter extension of the exponential potential which can approximate the form of typical thawing potentials....
Boson stars in the centre of galaxies? (2008)
Schunck, Franz E., Liddle, Andrew R.
We investigate the possible gravitational redshift values for boson stars with a self-interaction, studying a wide range of possible masses. We find a limiting value of z_lim \simeq 0.687 for stable...
Oscillations in the inflaton potential? (2008)
Pahud, Cédric, Kamionkowski, Marc, Liddle, Andrew R
We consider a class of inflationary models with small oscillations imprinted on an otherwise smooth inflaton potential. These oscillations are manifest as oscillations in the power spectrum of...
Triple unification of inflation, dark matter, and dark energy using a single field (2008)
Liddle, Andrew R., Pahud, Cédric, Ureña-López, L. Arturo
We construct an explicit scenario whereby the same material driving inflation in the early Universe can comprise dark matter in the present Universe, using a simple quadratic potential. Following...
Urrestilla, Jon, Mukherjee, Pia, Liddle, Andrew R., Bevis, Neil, Hindmarsh, Mark, Kunz, Martin
While observations indicate that the predominant source of cosmic inhomogeneities are adiabatic perturbations, there are a variety of candidates to provide auxiliary trace effects, including...
Planck and reionization history: a model selection view (2008)
Mukherjee, Pia, Liddle, Andrew R.
We use Bayesian model selection tools to forecast the Planck satellite's ability to distinguish between different models for the reionization history of the Universe, using the large angular scale...
Sahlén, Martin, Viana, Pedro T. P., Liddle, Andrew R., Romer, A. Kathy, Davidson, Michael, Sabirli, Kivanc, ...
We forecast the constraints on the values of sigma_8, Omega_m, and cluster scaling relation parameters which we expect to obtain from the XMM Cluster Survey (XCS). We assume a flat Lambda-CDM...
STRUCTURE FORMATION IN INFLATIONARY COSMOLOGIES (2007)
A brief account is given of large-scale structure modelling based on the assumption that the initial perturbations arise from inflation. A recap is made of the implications of inflation for...
Astronomy Centre, Division of Physics and Astronomy, University of Sussex, (2007)
David H. Lyth, Andrew R. Liddle
Contribution to the 1993 Capri cmb workshop, to appear in
Can Inflation be Falsified? (2007)
John Barrow And, John D. Barrow, Andrew R. Liddle
Despite its central role in modern cosmology, doubts are often expressed as to whether cosmological inflation is really a falsifiable theory. We distinguish two facets of inflation, one as a theory...
Cosmological Parameter Estimation and the Spectral Index From Inflation (2007)
Edmund Copeland, Ian J. Grivell, Andrew R. Liddle
Accurate estimation of cosmological parameters from microwave background anisotropies requires high-accuracy understanding of the cosmological model. Normally, a power-law spectrum of density...
Edmund J. Copeland, Andrew R. Liddle, David H. Lyth, Lancaster La Yb, ...
We review some of the properties of chaotic inflation models possessing two scalar fields. One of these (the inflaton) rolls while the other is trapped in a false vacuum state which can dominate the...
Reconstructing the Inflaton Potential (2007)
Edward W. Kolb, Mark Abney, Edmund J. Copeland, Andrew R. Liddle, James E. Lidsey
INTRODUCTION Inflation involves a period of rapid growth of the Universe. This is most easily illustrated by considering a homogeneous, isotropic Universe with a flat Friedmann-- Robertson--Walker...
Stability of multi-field cosmological solutions (2007)
Calcagni, Gianluca, Liddle, Andrew R.
We explore the stability properties of multi-field solutions of assisted inflation type, where several fields collectively evolve to the same configuration. In the case of noninteracting fields, we...
WMAP normalization of inflationary cosmologies (2007)
Liddle, Andrew R., Parkinson, David, Leach, Samuel M., Mukherjee, Pia
We use the three-year WMAP observations to determine the normalization of the matter power spectrum in inflationary cosmologies. In this context, the quantity of interest is not the normalization...
Cosmic microwave anisotropies from BPS semilocal strings (2007)
Urrestilla, Jon, Bevis, Neil, Hindmarsh, Mark, Kunz, Martin, Liddle, Andrew R.
We present the first ever calculation of cosmic microwave background CMB anisotropy power spectra from semilocal cosmic strings, obtained via simulations of a classical field theory. Semilocal...
The XMM Cluster Survey: The Dynamical State of XMMXCS J2215.9-1738 at z=1.457 (2007)
Hilton, Matt, Collins, Chris A., Stanford, S. Adam, Lidman, Chris, Dawson, Kyle S., Davidson, Michael, ...
We present new spectroscopic observations of the most distant X-ray selected galaxy cluster currently known, XMMXCS J2215.9-1738 at z=1.457, obtained with the DEIMOS instrument at the W. M. Keck...
Nflation: observable predictions from the random matrix mass spectrum (2007)
We carry out numerical investigations of the perturbations in Nflation models where the mass spectrum is generated by random matrix theory. The tensor-to-scalar ratio and non-gaussianity are already...
The Sunyaev-Zel'dovich temperature of the intracluster medium (2007)
Kay, Scott T., Powell, Leila C., Liddle, Andrew R., Thomas, Peter A.
The relativistic Sunyaev-Zel'dovich (SZ) effect offers a method, independent of X-ray, for measuring the temperature of the intracluster medium (ICM) in the hottest systems. Here, using...
Liddle, Andrew R, Corasaniti, Pier Stefano, Kunz, Martin, Mukherjee, Pia, Parkinson, David, Trotta, Roberto
In astro-ph/0702542v2, Linder and Miquel seek to criticize the use of Bayesian model selection for data analysis and for survey forecasting and design. Their discussion is based on three serious...
On what scale should inflationary observables be constrained? (2007)
Cortês, Marina, Liddle, Andrew R, Mukherjee, Pia
We examine the choice of scale at which constraints on inflationary observables are presented. We describe an implementation of the hierarchy of inflationary consistency equations which ensures that...
When can the Planck satellite measure spectral index running? (2007)
Pahud, Cédric, Liddle, Andrew R., Mukherjee, Pia, Parkinson, David
We use model selection forecasting to assess the ability of the Planck satellite to make a positive detection of spectral index running. We simulate Planck data for a range of assumed cosmological...
Information criteria for astrophysical model selection (2007)
Model selection is the problem of distinguishing competing models, perhaps featuring different numbers of parameters. The statistics literature contains two distinct sets of tools, those based on...
Kay, Scott T., Da Silva, Antonio C., Aghanim, Nabila, Blanchard, Alain, Liddle, Andrew R., Puget, Jean-Loup, ...
We present results from a study of the X-ray cluster population that forms within the CLEF cosmological hydrodynamics simulation, a large N-body/SPH simulation of the Lambda CDM cosmology with...
Quintessence reconstructed: new constraints and tracker viability (2006)
Sahlén, Martin, Liddle, Andrew R, Parkinson, David
We update and extend our previous work reconstructing the potential of a quintessence field from current observational data. We extend the cosmological dataset to include new supernova data, plus...
Intermediate inflation in light of the three-year WMAP observations (2006)
Barrow, John D, Liddle, Andrew R, Pahud, Cédric
The three-year observations from the Wilkinson Microwave Anisotropy Probe have been hailed as giving the first clear indication of a spectral index n_s0 is given (within the slow-roll approximation)...
Present and future evidence for evolving dark energy (2006)
Liddle, Andrew R, Mukherjee, Pia, Parkinson, David, Wang, Yun
We compute the Bayesian evidences for one- and two-parameter models of evolving dark energy, and compare them to the evidence for a cosmological constant, using current data from Type Ia supernova,...
Cosmological model selection (2006)
Liddle, Andrew R., Mukherjee, Pia, Parkinson, David
Model selection aims to determine which theoretical models are most plausible given some data, without necessarily asking about the preferred values of the model parameters. A common model selection...
Nflation: non-gaussianity in the horizon-crossing approximation (2006)
Kim, Soo A., Liddle, Andrew R.
We analyze the cosmic non-gaussianity produced in inflation models with multiple uncoupled fields with monomial potentials, such as Nflation. Using the horizon-crossing approximation to compute the...
The WMAP normalization of inflationary cosmologies (2006)
Liddle, Andrew R, Parkinson, David, Leach, Samuel M, Mukherjee, Pia
We use the three-year WMAP observations to determine the normalization of the matter power spectrum in inflationary cosmologies. In this context, the quantity of interest is not the normalization...
Cosmic reionization constraints on the nature of cosmological perturbations (2006)
Avelino, Pedro P., Liddle, Andrew R.
We study the reionization history of the Universe in cosmological models with non-Gaussian density fluctuations, taking them to have a renormalized $\chi^2$ probability distribution function...
Tachyon dark energy models: dynamics and constraints (2006)
Calcagni, Gianluca, Liddle, Andrew R.
We explore the dynamics of dark energy models based on a Dirac-Born-Infeld (DBI) tachyonic action, studying a range of potentials. We numerically investigate the existence of tracking behaviour and...
Nflation: multi-field inflationary dynamics and perturbations (2006)
We carry out numerical investigations of the dynamics and perturbations in the Nflation model of Dimopoulos et al. (2005). This model features large numbers of scalar fields with different masses,...
Inflation, dark matter and dark energy in the string landscape (2006)
Liddle, Andrew R, Ureña-López, L Arturo
We consider the conditions needed to unify the description of dark matter, dark energy and inflation in the context of the string landscape. We find that incomplete decay of the inflaton field gives...
A Bayesian model selection analysis of WMAP3 (2006)
Parkinson, David, Mukherjee, Pia, Liddle, Andrew R
We present a Bayesian model selection analysis of WMAP3 data using our code CosmoNest. We focus on the density perturbation spectral index $n_S$ and the tensor-to-scalar ratio $r$, which define the...
Model selection forecasts for the spectral index from the Planck satellite (2006)
Pahud, Cédric, Liddle, Andrew R, Mukherjee, Pia, Parkinson, David
The recent WMAP3 results have placed measurements of the spectral index n_S in an interesting position. While parameter estimation techniques indicate that the Harrison-Zel'dovich spectrum n_S=1 is...
The consistency equation hierarchy in single-field inflation models (2006)
Cortês, Marina, Liddle, Andrew R
Inflationary consistency equations relate the scalar and tensor perturbations. We elucidate the infinite hierarchy of consistency equations of single-field inflation, the first of which is the...
The Cosmological Parameters 2006 (2006)
This is a review article for The Review of Particle Physics 2006 (aka the Particle Data Book). It forms a compact review of knowledge of the cosmological parameters as at May 2006. Topics included...
Model selection as a science driver for dark energy surveys (2005)
Mukherjee, Pia, Parkinson, David, Corasaniti, Pier Stefano, Liddle, Andrew R., Kunz, Martin
A key science goal of upcoming dark energy surveys is to seek time evolution of the dark energy. This problem is one of {\em model selection}, where the aim is to differentiate between cosmological...
Cosmic microwave background multipole alignments in slab topologies (2005)
Cresswell, James G., Liddle, Andrew R., Mukherjee, Pia, Riazuelo, Alain
Several analyses of the microwave sky maps from the Wilkinson Microwave Anisotropy Probe (WMAP) have drawn attention to alignments amongst the low-order multipoles. Amongst the various possible...
A Nested Sampling Algorithm for Cosmological Model Selection (2005)
Mukherjee, Pia, Parkinson, David, Liddle, Andrew R.
The abundance of new cosmological data becoming available means that a wider range of cosmological models are testable than ever before. However, an important distinction must be made between...
Direct reconstruction of the quintessence potential (2005)
Sahlén, Martin, Liddle, Andrew R., Parkinson, David
We describe an algorithm which directly determines the quintessence potential from observational data, without using an equation of state parametrisation. The strategy is to numerically determine...
Flow equations in generalized braneworld scenarios (2005)
Calcagni, Gianluca, Liddle, Andrew R., Ramirez, Erandy
We discuss the flow equations in the context of general braneworld cosmologies with a modified Friedmann equation, for either an ordinary scalar field or a Dirac-Born-Infeld tachyon as inflaton...
Dynamics of assisted quintessence (2005)
Kim, Soo A, Liddle, Andrew R, Tsujikawa, Shinji
We explore the dynamics of assisted quintessence, where more than one scalar field is present with the same potential. For potentials with tracking solutions, the fields naturally approach the same...
Stochastic approaches to inflation model building (2005)
Ramirez, Erandy, Liddle, Andrew R
While inflation gives an appealing explanation of observed cosmological data, there are a wide range of different inflation models, providing differing predictions for the initial perturbations....
Braneworld flow equations (2004)
Ramirez, Erandy, Liddle, Andrew R
We generalize the flow equations approach to inflationary model building to the Randall-Sundrum Type II braneworld scenario. As the flow equations are quite insensitive to the expansion dynamics, we...
Structure formation constraints on the Jordan-Brans-Dicke theory (2004)
Acquaviva, Viviana, Baccigalupi, Carlo, Leach, Samuel M., Liddle, Andrew R., Perrotta, Francesca
We use cosmic microwave background data from WMAP, ACBAR, VSA and CBI, and galaxy power spectrum data from 2dF, to constrain flat cosmologies based on the Jordan-Brans-Dicke theory, using a Markov...
A new calculation of the mass fraction of primordial black holes. (2004)
Green, Anne M., Liddle, Andrew R., Malik, Karim A., Sasaki, Misao
We revisit the calculation of the abundance of primordial black holes (PBHs) formed from primordial density perturbations, using a formation criterion derived by Shibata and Sasaki which refers to a...
The Cosmological Parameters (2004)
This is a new review article for The Review of Particle Physics 2004 (aka the Particle Data Book). It forms a compact review of knowledge of the cosmological parameters as at the end of 2003. Topics...
XMM Cluster Survey: X-ray source identification using the Sloan Digital Sky Survey (2004)
Land, Kate R., Nichol, Robert C., Davidson, Michael, Sabirli, Kivanc, Romer, A. Kathy, Liddle, Andrew R., ...
[ABRIDGED] The XMM Cluster Survey (XCS) is predicted to detect thousands of clusters observed serendipitously in XMM-Newton pointings. We investigate automating optical follow-up of cluster...
A new calculation of the mass fraction of primordial black holes (2004)
Green, Anne M., Liddle, Andrew R., Malik, Karim A., Sasaki, Misao
We revisit the calculation of the abundance of primordial black holes (PBHs) formed from primordial density perturbations, using a formation criterion derived by Shibata and Sasaki which refers to a...
How many cosmological parameters? (2004)
Constraints on cosmological parameters depend on the set of parameters chosen to define the model which is compared with observational data. I use the Akaike and Bayesian information criteria to...
Constraints on braneworld inflation from CMB anisotropies (2003)
Tsujikawa, Shinji, Liddle, Andrew R.
We obtain observational constraints on Randall--Sundrum type II braneworld inflation using a compilation of data including WMAP, the 2dF and latest SDSS galaxy redshift surveys. We place constraints...
Perturbations in cosmologies with a scalar field and a perfect fluid (2003)
Bartolo, Nicola, Corasaniti, Pier-Stefano, Liddle, Andrew R., Malquarti, Michaël
We study the properties of cosmological density perturbations in a multi-component system consisting of a scalar field and a perfect fluid. We discuss the number of degrees of freedom completely...
Inflationary potentials yielding constant scalar perturbation spectral indices (2003)
Vallinotto, Alberto, Copeland, Edmund J., Kolb, Edward W., Liddle, Andrew R., Steer, Daniele A.
We explore the types of slow-roll inflationary potentials that result in scalar perturbations with a constant spectral index, i.e., perturbations that may be described by a single power-law spectrum...
From the production of primordial perturbations to the end of inflation (2003)
Malquarti, Michaël, Leach, Samuel M., Liddle, Andrew R.
In addition to generating the appropriate perturbation power spectrum, an inflationary scenario must take into account the need for inflation to end subsequently. In the context of single-field...
Inflationary slow-roll formalism and perturbations in the Randall-Sundrum Type II braneworld (2003)
Ramirez, Erandy, Liddle, Andrew R.
We formalize the Hubble slow-roll formalism for inflationary dynamics in Randall-Sundrum Type II braneworld cosmologies, defining Hubble slow-roll parameters which can be used along with the...
The Cosmological Parameters (2003)
Pre-publication version withdrawn at the request of the journal. Final version now available in Reviews of Particle Physics at http://pdg.lbl.gov/2004/reviews/contents_sports.html
Da Silva, Antonio C., Kay, Scott T., Liddle, Andrew R., Thomas, Peter A.
The Sunyaev-Zel'dovich effect is a powerful new tool for finding and studying clusters at high redshift, particularly in combination with their X-ray properties. In this paper we quantify the...
On the inflationary flow equations (2003)
I explore properties of the inflationary flow equations. I show that the flow equations do not correspond directly to inflationary dynamics. Nevertheless, they can be used as a rather complicated...
Observational constraints on braneworld chaotic inflation (2003)
Liddle, Andrew R, Smith, Anthony J
We examine observational constraints on chaotic inflation models in the Randall-Sundrum Type II braneworld. If inflation takes place in the high-energy regime, the perturbations produced by the...
Constraining slow-roll inflation with WMAP and 2dF (2003)
Leach, Samuel M, Liddle, Andrew R
We constrain slow-roll inflationary models using the recent WMAP data combined with data from the VSA, CBI, ACBAR and 2dF experiments. We find the slow-roll parameters to be $0 < \epsilon_1 < 0.032$...
Cosmological perturbations and the reionization epoch (2003)
Avelino, Pedro P, Liddle, Andrew R
We investigate the dependence of the epoch of reionization on the properties of cosmological perturbations, in the context of cosmologies permitted by WMAP. We compute the redshift of reionization...
How long before the end of inflation were observable perturbations produced? (2003)
Liddle, Andrew R, Leach, Samuel M
We reconsider the issue of the number of e-foldings before the end of inflation at which observable perturbations were generated. We determine a plausible upper limit on that number for the standard...
K-essence and the coincidence problem (2003)
Malquarti, Michael, Copeland, Edmund J, Liddle, Andrew R
K-essence has been proposed as a possible means of explaining the coincidence problem of the Universe beginning to accelerate only at the present epoch. We carry out a comprehensive dynamical systems...
A new view of k-essence (2003)
Malquarti, Michael, Copeland, Edmund J, Liddle, Andrew R, Trodden, Mark
K-essence models, relying on scalar fields with non-canonical kinetic terms, have been proposed as an alternative to quintessence in explaining the observed acceleration of the Universe. We consider...
Curvaton reheating: an application to braneworld inflation (2003)
Liddle, Andrew R., Urena-Lopez, L. Arturo
The curvaton was introduced recently as a distinct inflationary mechanism for generating adiabatic density perturbations. Implicit in that scenario is that the curvaton offers a new mechanism for...
Primordial black holes in braneworld cosmologies: astrophysical constraints (2003)
Clancy, Dominic, Guedens, Raf, Liddle, Andrew R
In two recent papers we explored the modifications to primordial black hole physics when one moves to the simplest braneworld model, Randall--Sundrum type II. Both the evaporation law and the...
Viana, Pedro T P, Kay, Scott T, Liddle, Andrew R, Muanwong, Orrarujee, Thomas, Peter A
The amplitude of density perturbations, for the currently-favoured LambdaCDM cosmology, is constrained using the observed properties of galaxy clusters. The catalogue used is that of Ikebe et al....
Evolution of large-scale perturbations in quintessence models (2002)
Malquarti, Michael, Liddle, Andrew R.
We carry out a comprehensive study of the dynamics of large-scale perturbations in quintessence scenarios. We model the contents of the Universe by a perfect fluid with equation of state w_f and a...
Primordial black holes in braneworld cosmologies: Accretion after formation (2002)
Guedens, Raf, Clancy, Dominic, Liddle, Andrew R
We recently studied the formation and evaporation of primordial black holes in a simple braneworld cosmology, namely Randall-Sundrum Type II. Here we study the effect of accretion from the...
Supermassive black holes in scalar field galaxy halos (2002)
Urena-Lopez, L. Arturo, Liddle, Andrew R.
Ultra-light scalar fields provide an interesting alternative to WIMPS as halo dark matter. In this paper we consider the effect of embedding a supermassive black hole within such a halo, and estimate...
Microwave background constraints on inflationary parameters (2002)
Leach, Samuel M, Liddle, Andrew R
We use a compilation of cosmic microwave anisotropy data (including the recent VSA, CBI and Archeops results), supplemented with an additional constraint on the expansion rate, to directly constrain...
Guedens, Raf, Clancy, Dominic, Liddle, Andrew R
We consider the population evolution and evaporation of primordial black holes in the simplest braneworld cosmology, Randall-Sundrum type II. We demonstrate that black holes forming during the...
Initial conditions for quintessence after inflation (2002)
Malquarti, Michael, Liddle, Andrew R
We consider the behaviour of a quintessence field during an inflationary epoch, in order to learn how inflation influences the likely initial conditions for quintessence. We use the stochastic...
The simplest curvaton model (2002)
We analyze the simplest possible realization of the curvaton scenario, where a nearly scale-invariant spectrum of adiabatic perturbations is generated by conversion of an isocurvature perturbation...
Cosmological parameter estimation and the inflationary cosmology (2002)
Leach, Samuel M., Liddle, Andrew R., Martin, Jerome, Schwarz, Dominik J.
We consider approaches to cosmological parameter estimation in the inflationary cosmology, focussing on the required accuracy of the initial power spectra. Parametrizing the spectra, for example by...
Recent developments in cosmology (2002)
This article gives an overview, aimed at theoretical particle physicists, of some recent developments in cosmology.
Can simulations reproduce the observed temperature-mass relation for clusters of galaxies? (2001)
Thomas, Peter A., Muanwong, Orrarujee, Kay, Scott T., Liddle, Andrew R.
It has become increasingly apparent that traditional hydrodynamical simulations of galaxy clusters are unable to reproduce the observed properties of galaxy clusters, in particular overpredicting the...
Inflationary Cosmology: Status and Prospects (2001)
This article gives a brief overview of the status of attempts to constrain inflation using observations, and examines prospects for future developments.
Viana, Pedro T. P., Nichol, Robert C., Liddle, Andrew R.
We describe a new approach to constrain the amplitude of the power spectrum of matter perturbations in the Universe, parametrized by sigma_8 as a function of the matter density Omega_0. We compare...
Inflationary Cosmology: Theory and Phenomenology (2001)
This article gives a brief overview of some of the theory behind the inflationary cosmology, and discusses prospects for constraining inflation using observations. Particular care is given to the...
Inflaton potential reconstruction in the braneworld scenario (2001)
We consider inflaton potential reconstruction in the context of the simplest braneworld scenario, where both the Friedmann equation and the form of scalar and tensor perturbations are modified at...
The impact of cooling and pre-heating on the Sunyaev-Zel'dovich effect (2001)
Da Silva, Antonio C, Kay, Scott T, Liddle, Andrew R, Thomas, Peter A, Pearce, Frazer R, Barbosa, Domingos
We use hydrodynamical simulations to assess the impact of radiative cooling and `pre-heating' on predictions for the Sunyaev--Zel'dovich (SZ) effect. Cooling significantly reduces both the mean SZ...
The evolution and persistence of dumbbells (2001)
Urrestilla, Jon, Achucarro, Ana, Borrill, Julian, Liddle, Andrew R.
We use large-scale numerical simulations to study the formation and evolution of non-topological defects in a generalized electroweak phase transition described by the Glashow-Salam-Weinberg model...
The lepton asymmetry: the last chance for a critical-density cosmology? (2001)
Lesgourgues, Julien, Liddle, Andrew R.
We use a wide range of observations to constrain cosmological models possessing a significant asymmetry in the lepton sector, which offer perhaps the best chance of reconciling a critical-density...
Kay, Scott T, Liddle, Andrew R, Thomas, Peter A
We use the billion-particle Hubble Volume simulations to make statistical predictions for the distribution of galaxy clusters that will be observed by the Planck Surveyor satellite through their...
Enhancement of superhorizon scale inflationary curvature perturbations (2001)
Leach, Samuel M, Sasaki, Misao, Wands, David, Liddle, Andrew R
We show that there exists a simple mechanism which can enhance the amplitude of curvature perturbations on superhorizon scales during inflation, relative to their amplitude at horizon crossing. The...
The effect of reionization on the COBE normalization (2001)
Griffiths, Louise M, Liddle, Andrew R
We point out that the effect of reionization on the microwave anisotropy power spectrum is not necessarily negligible on the scales probed by COBE. It can lead to an upward shift of the COBE...
Apparent and actual galaxy cluster temperatures (2000)
Liddle, Andrew R, Viana, Pedro T P, Romer, A Kathy, Mann, Robert G
The redshift evolution of the galaxy cluster temperature function is a powerful probe of cosmology. However, its determination requires the measurement of redshifts for all clusters in a catalogue,...
Gravitino production in the warm inflationary scenario (2000)
Taylor, A. N., Liddle, Andrew R.
We estimate the production of gravitinos during and after the end of a period of warm inflation, a model in which radiation is produced continuously as the field rolls down the potential producing...
Hydrodynamical simulations of the Sunyaev-Zel'dovich effect: the kinetic effect (2000)
Da Silva, Antonio C, Barbosa, Domingos, Liddle, Andrew R, Thomas, Peter A
We use hydrodynamical N-body simulations to study the kinetic Sunyaev-Zel'dovich effect. We construct sets of maps, one square degree in size, in three different cosmological models. We confirm...
Inflationary perturbations near horizon crossing (2000)
Leach, Samuel M, Liddle, Andrew R
We study the behaviour of inflationary density perturbations in the vicinity of horizon crossing, using numerical evolution of the relevant mode equations. We explore two specific scenarios. In one,...
Acceleration of the Universe (2000)
The cosmological model best capable of fitting current observational data features two separate epochs during which the Universe is accelerating. During the earliest stages of the Universe, such...
Steep inflation: ending braneworld inflation by gravitational particle production (2000)
Copeland, Edmund J, Liddle, Andrew R, Lidsey, James E
We propose a scenario for inflation based upon the braneworld picture, in which high-energy corrections to the Friedmann equation permit inflation to take place with potentials ordinarily too steep...
Initial conditions for hybrid inflation (2000)
Mendes, Luis E, Liddle, Andrew R
In hybrid inflation models, typically only a tiny fraction of possible initial conditions give rise to successful inflation, even if one assumes spatial homogeneity. We analyze some possible...
The Dearth of Halo Dwarf Galaxies: Is There Power on Short Scales? (2000)
Kamionkowski, Marc, Liddle, Andrew R.
N-body simulations of structure formation with scale-invariant primordial perturbations show significantly more virialized objects of dwarf-galaxy mass in a typical galactic halo than are observed...
Black hole constraints on the running-mass inflation model (2000)
Leach, Samuel M, Grivell, Ian J, Liddle, Andrew R
The running-mass inflation model, which has strong motivation from particle physics, predicts density perturbations whose spectral index is strongly scale-dependent. For a large part of parameter...
A new approach to the evolution of cosmological perturbations on large scales (2000)
Wands, David, Malik, Karim A., Lyth, David H., Liddle, Andrew R.
We discuss the evolution of linear perturbations about a Friedmann-Robertson-Walker background metric, using only the local conservation of energy-momentum. We show that on sufficiently large scales...
Super-horizon perturbations and preheating (1999)
Liddle, Andrew R., Lyth, David H., Malik, Karim A., Wands, David
It has recently been claimed by Bassett et al that preheating after inflation may affect the amplitude of curvature perturbations on large scales, undermining the usual inflationary prediction. We...
Perturbation amplitude in isocurvature inflation scenarios (1999)
Liddle, Andrew R, Mazumdar, Anupam
We make a detailed calculation of the amplitude of isocurvature perturbations arising from inflationary models in which the cold dark matter is represented by a scalar field which acquires...
Romer, A. Kathy, Viana, Pedro T. P., Liddle, Andrew R., Mann, Robert G.
This paper describes a serendipitous galaxy cluster survey that we plan to conduct with the XMM X-ray satellite. We have modeled the expected properties of such a survey for three different...
The dearth of halo dwarf galaxies: is there power on short scales? (1999)
Kamionkowski, Marc, Liddle, Andrew R.
N-body simulations of structure formation with scale-invariant primordial perturbations show significantly more virialized objects of dwarf-galaxy mass in a typical galactic halo than are observed...
Dynamics and perturbations in assisted chaotic inflation (1999)
Kaloper, Nemanja, Liddle, Andrew R.
On compactification from higher dimensions, a single free massive scalar field gives rise to a set of effective four-dimensional scalar fields, each with a different mass. These can cooperate to...
Observational tests of inflation (1999)
We are on the verge of the first precision testing of the inflationary cosmology as a model for the origin of structure in the Universe. I review the key predictions of inflation which can be used as...
Hydrodynamical simulations of the Sunyaev--Zel'dovich effect (1999)
Da Silva, Antonio C, Barbosa, Domingos, Liddle, Andrew R, Thomas, Peter A
We use a hydrodynamical N-body code to generate simulated maps, of size one square degree, of the thermal SZ effect. We study three different cosmologies; the currently-favoured low-density model...
Inflaton potential reconstruction without slow-roll (1999)
Grivell, Ian J, Liddle, Andrew R
We describe a method of obtaining the inflationary potential from observations which does not use the slow-roll approximation. Rather, the microwave anisotropy spectrum is obtained directly from a...
Aspects of inflationary reconstruction (1999)
I review various aspects of techniques for reconstructing the potential of the inflaton field from observations, with special emphasis on difficulties which might arise. While my view is that if...
Galaxy Cluster Abundance Evolution and Cosmological Parameters (1999)
Viana, Pedro T. P., Liddle, Andrew R.
We use the observed evolution of the galaxy cluster X-ray integral temperature distribution function between z=0.05 and z=0.32 in an attempt to constrain the value of the density parameter, Omega_0,...
Critical collapse and the primordial black hole initial mass function (1999)
Green, Anne M, Liddle, Andrew R
It has normally been assumed that primordial black holes (PBHs) always form with mass approximately equal to the mass contained within the horizon at that time. Recent work studying the application...
An introduction to cosmological inflation (1999)
An introductory account is given of the inflationary cosmology, which postulates a period of accelerated expansion during the Universe's earliest stages. The historical motivation is briefly...
Inflation and the cosmic microwave background (1999)
Various issues concerning the impact of inflationary models on parameter estimation from the cosmic microwave background are reviewed, with particular focus on the range of possible outcomes of...
An Introduction to Modern Cosmology (1999)
Introducción a la cosmología moderna. Aborda los conceptos actuales sobre el origen del universo, se explica la teoría del Big Bang, la expansión del universo con una aproximación a la física...
An Introduction to Modern Cosmology / A.R. Liddle. (1999)
Introducción a la cosmología moderna. Aborda los conceptos actuales sobre el origen del universo, se explica la teoría del Big Bang, la expansión del universo con una aproximación a la física...
Cosmic microwave background constraints on the epoch of reionization (1998)
Griffiths, Louise M, Barbosa, Domingos, Liddle, Andrew R
We use a compilation of cosmic microwave anisotropy data to constrain the epoch of reionization in the Universe, as a function of cosmological parameters. We consider spatially-flat cosmologies,...
Early cosmology and the stochastic gravitational wave background (1998)
Mendes, Luis E, Liddle, Andrew R
The epoch when the Universe had a temperature higher than a GeV is long before any time at which we have reliable observations constraining the cosmological evolution. For example, the occurrence of...
On the formation of non-topological string networks (1998)
Achúcarro, Ana, Borrill, Julian, Liddle, Andrew R.
We review recent simulations of the formation of a particular class of non-topological defects known as semilocal strings during a phase transition. Semilocal strings have properties that are...
A classification of scalar field potentials with cosmological scaling solutions (1998)
Liddle, Andrew R, Scherrer, Robert J
An attractive method of obtaining an effective cosmological constant at the present epoch is through the potential energy of a scalar field. Considering models with a perfect fluid and a scalar...
Inflation during oscillations of the inflaton (1998)
Liddle, Andrew R, Mazumdar, Anupam
Damour and Mukhanov have recently devised circumstances in which inflation may continue during the oscillatory phase which ensues once the inflaton field reaches the minimum of its potential. We...
Black holes and gravitational waves in concert - a probe of superstring cosmology (1998)
Copeland, Edmund J., Liddle, Andrew R., Lidsey, James E., Wands, David
Two strands of observational gravitation, one the search for astrophysical evidence of primordial black holes and the other the search for gravitational waves, may combine to provide strong evidence...
Liddle, Andrew R, Mazumdar, Anupam, Schunck, Franz E
In inflationary scenarios with more than one scalar field, inflation may proceed even if each of the individual fields has a potential too steep for that field to sustain inflation on its own. We...
Cosmological Constraints from Primordial Black Holes (1998)
Liddle, Andrew R, Green, Anne M
Primordial black holes may form in the early Universe, for example from the collapse of large amplitude density perturbations predicted in some inflationary models. Light black holes undergo Hawking...
Brans-Dicke Boson Stars: Configurations and Stability through Cosmic History (1998)
Torres, Diego F, Schunck, Franz E, Liddle, Andrew R
We make a detailed study of boson star configurations in Jordan--Brans--Dicke theory, studying both equilibrium properties and stability, and considering boson stars existing at different cosmic...
Galaxy clusters at 0.3 < z < 0.4 and the value of \Omega_0 (1998)
Viana, Pedro T P, Liddle, Andrew R
The observed evolution of the galaxy cluster X-ray integral temperature distribution function between $z=0.05$ and $z=0.32$ is used in an attempt to constrain the value of the density parameter,...
Black holes and gravitational waves in string cosmology (1998)
Copeland, Edmund J, Liddle, Andrew R, Lidsey, James E, Wands, David
Pre--big bang models of inflation based on string cosmology produce a stochastic gravitational wave background whose spectrum grows with decreasing wavelength, and which may be detectable using...
Inflation and the microwave background (1998)
I discuss the interplay between inflation and microwave background anisotropies, stressing in particular the accuracy with which inflation predictions need to be made, and the importance of inflation...
On the reliability of inflaton potential reconstruction (1998)
Copeland, Edmund J., Grivell, Ian J., Kolb, Edward W., Liddle, Andrew R.
If primordial scalar and tensor perturbation spectra can be inferred from observations of the cosmic background radiation and large-scale structure, then one might hope to reconstruct a unique...
The formation rate of semilocal strings (1998)
Achucarro, Ana, Borrill, Julian, Liddle, Andrew R
We carry out three-dimensional numerical simulations to investigate the formation rate of semilocal strings. We find that the back-reaction of the gauge fields on the scalar field evolution is...
The radiation-matter transition in Jordan-Brans-Dicke theory (1998)
Liddle, Andrew R, Mazumdar, Anupam, Barrow, John D
We study the transition from radiation domination to matter domination in Jordan-Brans-Dicke theory, in particular examining how the Hubble length at equality depends on the coupling parameter...
Cosmological parameter estimation and the spectral index from inflation (1997)
Copeland, Edmund J, Grivell, Ian J, Liddle, Andrew R
Accurate estimation of cosmological parameters from microwave background anisotropies requires high-accuracy understanding of the cosmological model. Normally, a power-law spectrum of density...
Exponential potentials and cosmological scaling solutions (1997)
Copeland, Edmund J, Liddle, Andrew R, Wands, David
We present a phase-plane analysis of cosmologies containing a barotropic fluid with equation of state $p_\gamma = (\gamma-1) \rho_\gamma$, plus a scalar field $\phi$ with an exponential potential $V...
Primordial black holes and early cosmology (1997)
Liddle, Andrew R, Green, Anne M
We describe the changes to the standard primordial black hole constraints on density perturbations if there are modifications to the standard cosmology between the time of formation and...
Gravitational memory of boson stars (1997)
Torres, Diego F, Liddle, Andrew R, Schunck, Franz E
`Gravitational memory' refers to the possibility that, in cosmologies with a time-varying gravitational `constant', objects such as black holes may retain a memory of conditions at the time of their...
Perturbation evolution in cosmologies with a decaying cosmological constant (1997)
Viana, Pedro T P, Liddle, Andrew R
Structure formation models with a cosmological constant are successful in explaining large-scale structure data, but are threatened by the magnitude-redshift relation for Type Ia supernovae. This has...
Instability of the one-texture universe (1997)
Chen, Xuelei, Hindmarsh, Mark, Kamionkowski, Marc, Liddle, Andrew R.
The one-texture universe, introduced by Davis in 1987, is a homogeneous mapping of a scalar field with an S^3 vacuum into a closed universe. It has long been known to mathematicians that such...
Primordial black hole constraints in cosmologies with early matter domination (1997)
Green, Anne M, Liddle, Andrew R, Riotto, Antonio
Moduli fields, a natural prediction of any supergravity and superstring-inspired supersymmetry theory, may lead to a prolonged period of matter domination in the early Universe. This can be...
Can Inflation be Falsified? (1997)
Barrow, John D, Liddle, Andrew R
Despite its central role in modern cosmology, doubts are often expressed as to whether cosmological inflation is really a falsifiable theory. We distinguish two facets of inflation, one as a theory...
Constraints on the density perturbation spectrum from primordial black holes (1997)
Green, Anne M, Liddle, Andrew R
We re-examine the constraints on the density perturbation spectrum, including its spectral index $n$, from the production of primordial black holes. The standard cosmology, where the Universe is...
The gravitational redshift of boson stars (1997)
Schunck, Franz E, Liddle, Andrew R
We investigate the possible gravitational redshift values for boson stars with a self-interaction, studying a wide range of possible masses. We find a limiting value of $z_{lim} \simeq 0.687$ for...
Semilocal string formation in two dimensions (1997)
Achucarro, Ana, Borrill, Julian, Liddle, Andrew R
We present a toy model for the investigation of the formation of semilocal strings, where a planar symmetry is employed to reduce the system to two dimensions. We approximate the symmetry breaking...
On the instability of the one-texture universe (1997)
Chen, Xuelei, Hindmarsh, Mark, Kamionkowski, Marc, Liddle, Andrew R
The one-texture universe, introduced by Davis in 1987, is a homogeneous mapping of a scalar field with an $S^3$ vacuum into a closed universe. It has long been known to mathematicians that such...
Accurately determining inflationary perturbations (1997)
Liddle, Andrew R, Grivell, Ian J
Cosmic microwave anisotropy satellites promise extremely accurate measures of the amplitude of perturbations in the universe. We use a numerical code to test the accuracy of existing approximate...
An introductory account is given of the modern understanding of the physics of the early Universe. Particular emphasis is placed on the paradigm of cosmological inflation, which postulates a period...
Inflation, structure formation and dark matter (1996)
Liddle, Andrew R, Viana, Pedro T P
The formation of structure in the Universe offers some of the most powerful evidence in favour of the existence of dark matter in the Universe. We summarize recent work by ourselves and our...
Complete power spectrum for an induced gravity open inflation model (1996)
Garcia-Bellido, Juan, Liddle, Andrew R
We study the phenomenological constraints on a recently proposed model of open inflation in the context of induced gravity. The main interest of this model is the relatively small number of...
Normalization of modes in an open universe (1996)
Garcia-Bellido, Juan, Liddle, Andrew R, Lyth, David H, Wands, David
We discuss the appropriate normalization of modes required to generate a homogeneous random field in an open Friedmann-Robertson-Walker universe. We consider scalar random fields and certain tensor...
Open Inflationary Universes in the Induced Gravity Theory (1996)
Green, Anne M, Liddle, Andrew R
The induced gravity theory is a variant of Jordan--Brans--Dicke theory where the `dilaton' field possesses a potential. It has the unusual feature that in the presence of a false vacuum there is a...
Accurate determination of inflationary perturbations (1996)
Grivell, Ian J, Liddle, Andrew R
We use a numerical code for accurate computation of the amplitude of linear density perturbations and gravitational waves generated by single-field inflation models to study the accuracy of existing...
Four-year COBE normalization of inflationary cosmologies (1996)
Bunn, Emory F, Liddle, Andrew R, White, Martin
We supply fitting formulae enabling the normalization of slow-roll inflation models to the four-year COBE data. We fully include the effect of the gravitational wave modes, including the predicted...
Cold dark matter models with high baryon content (1996)
White, Martin, Viana, Pedro T. P., Liddle, Andrew R., Scott, Douglas
Recent results have suggested that the density of baryons in the Universe, OmegaB, is much more uncertain than previously thought, and may be significantly higher. We demonstrate that a higher OmegaB...
Structure Formation in Inflationary Cosmologies (1996)
A brief account is given of large-scale structure modelling based on the assumption that the initial perturbations arise from inflation. A recap is made of the implications of inflation for...
Conditions for Successful Extended Inflation (1996)
Green, Anne M, Liddle, Andrew R
We investigate, in a model-independent way, the conditions required to obtain a satisfactory model of extended inflation in which inflation is brought to an end by a first-order phase transition. The...
Cold dark matter models with high baryon content (1996)
Martin White, Andrew R. Liddle, Douglas Scott
Recent results have suggested that the density of baryons in the Universe, B, ismuch more uncertain than previously thought, and may be signi cantly higher. We demonstrate that a higher B increases...
Cold Dark Matter Models with a Cosmological Constant (1995)
Liddle, Andrew R, Lyth, David H, Viana, Pedro T P, White, Martin
We use linear and quasi-linear perturbation theory to analyse cold dark matter models of structure formation in spatially flat models with a cosmological constant. Both a tilted spectrum of density...
Pursuing Parameters for Critical Density Dark Matter Models (1995)
Liddle, Andrew R, Lyth, David H, Schaefer, R K, Shafi, Q, Viana, Pedro T P
We present an extensive comparison of models of structure formation with observations, based on linear and quasi-linear theory. We assume a critical matter density, and study both cold dark matter...
The Cluster Abundance in Flat and Open Cosmologies (1995)
Viana, Pedro T P, Liddle, Andrew R
We use the galaxy cluster X-ray temperature distribution function to constrain the amplitude of the power spectrum of density inhomogeneities on the scale corresponding to clusters. We carry out the...
Reconstructing the Inflaton Potential --- an Overview (1995)
Lidsey, James E, Liddle, Andrew R, Kolb, Edward W, Copeland, Edmund J, Barreiro, Tiago, Abney, Mark
We review the relation between the inflationary potential and the spectra of density (scalar) perturbations and gravitational waves (tensor perturbations) produced, with particular emphasis on the...
The Open Universe Grishchuk-Zel'dovich Effect (1995)
Garcia-Bellido, Juan, Liddle, Andrew R, Lyth, David H, Wands, David
The Grishchuk--Zel'dovich effect is the contribution to the microwave background anisotropy from an extremely large scale adiabatic density perturbation, on the standard hypothesis that this...
Open Cold Dark Matter Models (1995)
Liddle, Andrew R, Lyth, David H, Roberts, David, Viana, Pedro P T
Motivated by recent developments in inflationary cosmology indicating the possibility of obtaining genuinely open universes in some models, we compare the predictions of cold dark matter (CDM) models...
False Vacuum Inflation with a Quartic Potential (1994)
Roberts, David, Liddle, Andrew R, Lyth, David H
We consider a variant of Hybrid Inflation, where inflation is driven by two interacting scalar fields, one of which has a `Mexican hat' potential and the other a quartic potential. Given the...
An examination is made of the widely held belief that inflation is the only possible causal mechanism capable of generating density perturbations on scales well in excess of the Hubble radius. A...
Trends in Large Scale Structure Observations and the Likelihood of Early Reionization (1994)
Liddle, Andrew R, Lyth, David H
With the imminent promise of constraints on the epoch of reionization from observations of microwave background anisotropies, the question of whether or not the standard Cold Dark Matter (CDM) model...
Interpreting Large Scale Structure Observations (1994)
Lyth, David H, Liddle, Andrew R
The standard model of large scale structure is considered, in which the structure originates as a Gaussian adiabatic density perturbation with a nearly scale invariant spectrum. The basic theoretical...
Formalising the Slow-Roll Approximation in Inflation (1994)
Liddle, Andrew R., Parsons, Paul, Barrow, John D.
The meaning of the inflationary slow-roll approximation is formalised. Comparisons are made between an approach based on the Hamilton-Jacobi equations, governing the evolution of the Hubble...
Reconstructing the Inflaton Potential (1994)
Kolb, Edward W, Abney, Mark, Copeland, Edmund J, Liddle, Andrew R, Lidsey, James E
A review is presented of recent work by the authors concerning the use of large scale structure and microwave background anisotropy data to determine the potential of the inflaton field. The...
Texture-Induced Microwave Background Anisotropies (1994)
Borrill, Julian, Copeland, Edmund J, Liddle, Andrew R, Stebbins, Albert, Veeraraghavan, Shoba
We use numerical simulations to calculate the cosmic microwave background anisotropy induced by the evolution of a global texture field, with special emphasis on individual textures. Both spherically...
Second-Order Reconstruction of the Inflationary Potential (1994)
Liddle, Andrew R, Turner, Michael S
To first order in the deviation from scale invariance the inflationary potential and its first two derivatives can be expressed in terms of the spectral indices of the scalar and tensor...
Observational Constraints on the Spectral Index (1994)
Liddle, Andrew R, Lyth, David H
We address the possibility of bounding the spectral index $n$ of primordial density fluctuations, using both the cosmic microwave background (cmb) anisotropy and data on galaxies and clusters. Each...
False Vacuum Inflation with Einstein Gravity (1994)
Copeland, Edmund J, Liddle, Andrew R, Lyth, David H, Stewart, Ewan D, Wands, David
We investigate chaotic inflation models with two scalar fields, such that one field (the inflaton) rolls while the other is trapped in a false vacuum state. The false vacuum becomes unstable when the...
Formalising the Slow-Roll Approximation in Inflation (1994)
Andrew R. Liddle, Paul Parsons, John D. Barrow, Brighton Bn Qh
The meaning of the inflationary slow-roll approximation is formalised. Comparisons are made between an approach based on the Hamilton-Jacobi equations, governing the evolution of the Hubble...
Texture-Induced Microwave Background Anisotropies (1994)
Julian Borrill, Edmund J. Copeland, Andrew R. Liddle, Albert Stebbins, Shoba Veeraraghavan, Brighton Bn Qh
We use numerical simulations to calculate the cosmic microwave background anisotropy induced by the evolution of a global texture field, with special emphasis on individual textures. Both spherically...
Second-Order Reconstruction of the Inflationary Potential (1994)
Andrew R. Liddle, Michael S. Turner
To first order in the deviation from scale invariance the inflationary potential and its first two derivatives can be expressed in terms of the spectral indices of the scalar and tensor...
Reconstructing the Inflaton Potential---Perturbative Reconstruction to Second Order (1993)
Copeland, Edmund, Kolb, Edward W., Liddle, Andrew R., Lidsey, James E.
One method to reconstruct the scalar field potential of inflation is a perturbative approach, where the values of the potential and its derivatives are calculated as an expansion in departures from...
Can the Gravitational Wave Background from Inflation be Detected Locally? (1993)
The Cosmic Background Explorer (COBE) detection of microwave background anisotropies may contain a component due to gravitational waves generated by inflation. It is shown that the gravitational...
The Inflationary Energy Scale (1993)
The energy scale of inflation is of much interest, as it suggests the scale of grand unified physics and also governs whether cosmological events such as topological defect formation can occur after...
Extended Inflation with a Curvature-Coupled Inflaton (1993)
Laycock, Andrew M, Liddle, Andrew R
We examine extended inflation models enhanced by the addition of a coupling between the inflaton field and the space-time curvature. We examine two types of model, where the underlying inflaton...
Inflation and Mixed Dark Matter Models (1993)
Liddle, Andrew R, Lyth, David H
Recent large scale structure observations, including COBE, have prompted many authors to discuss modifications of the standard Cold Dark Matter model. Two of these, a tilted spectrum and a...
Observing the Inflaton Potential (1993)
Copeland, Edmund J., Kolb, Edward W., Liddle, Andrew R., Lidsey, James E.
We show how observations of the density perturbation (scalar) spectrum and the gravitational wave (tensor) spectrum allow a reconstruction of the potential responsible for cosmological inflation. A...
The Cold Dark Matter Density Perturbation (1993)
Liddle, Andrew R, Lyth, David H
This is a review of the Cold Dark Matter model of structure formation, and its variants. The approach is largely from first principles, the main aim being to impart a basic understanding of the...
Perturbation Spectra from Intermediate Inflation (1993)
Barrow, John D, Liddle, Andrew R
We investigate models of `intermediate' inflation, where the scale factor $a(t)$ grows as $a(t) = \exp (A t^f)$, $0 < f < 1$, $A$ constant. These solutions arise as exact analytic solutions for a...
Reconstructing the Inflaton Potential---in Principle and in Practice (1993)
Copeland, Edmund, Kolb, Edward W., Liddle, Andrew R., Lidsey, James E.
Generalizing the original work by Hodges and Blumenthal, we outline a formalism which allows one, in principle, to reconstruct the potential of the inflaton field from knowledge of the tensor...
COBE, Gravitational Waves, Inflation and Extended Inflation (1992)
Lyth, David H, Liddle, Andrew R
We analyse the implications for inflationary models of the cosmic microwave background (cmb) anisotropy measured by COBE. Vacuum fluctuations during inflation generate an adiabatic density...
The Big Bang: status and prospects
The 20th century saw the establishment of the first quantitative theory seeking to describe the behaviour of the Universe as a whole the Big Bang. This sets up a framework within which there has been...