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...
Planck priors for dark energy surveys (2008)
Mukherjee, Pia, Kunz, Martin, Parkinson, David, Wang, Yun
Although cosmic microwave background (CMB) anisotropy data alone cannot constrain simultaneously the spatial curvature and the equation of state of dark energy, CMB data provide a valuable addition...
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...
Observational Bounds on Modified Gravity Models (2007)
De Felice, Antonio, Mukherjee, Pia, Wang, Yun
Modified gravity provides a possible explanation for the currently observed cosmic accelaration. In this paper, we study general classes of modified gravity models. The Einstein-Hilbert action is...
Nontrivial Geometries: Bounds on the Curvature of the Universe (2007)
Mersini-Houghton, Laura, Wang, Yun, Mukherjee, Pia, Kafexhiu, Ervin
Probing the geometry of the universe is one of the most important endevours in cosmology. Current observational data from the Cosmic Microwave Background anisotropy (CMB), galaxy surveys and type Ia...
Observational Constraints on Dark Energy and Cosmic Curvature (2007)
Current observational bounds on dark energy depend on assumptions about the curvature of the universe. We present a simple and efficient method for incorporating constraints from CMB anisotropy data,...
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...
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...
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...
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...
Type Ia supernova (SN Ia), galaxy clustering, and cosmic microwave background anisotropy (CMB) data provide complementary constraints on the nature of the dark energy in the universe. We find that...
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...
Primordial Power Spectrum Reconstruction (2005)
In order to reconstruct the initial conditions of the universe it is important to devise a method that can efficiently constrain the shape of the power spectrum of primordial matter density...
Looking for Cosmological Alfven Waves in WMAP Data (2004)
Chen, Gang, Mukherjee, Pia, Kahniashvili, Tina, Ratra, Bharat, Wang, Yun
A primordial cosmological magnetic field induces and supports vorticity or Alfven waves, which in turn generate cosmic microwave background (CMB) anisotropies. A homogeneous primordial magnetic field...
Wavelets and WMAP non-Gaussianity (2004)
We study the statistical properties of the 1st year WMAP data on different scales using the spherical mexican hat wavelet transform. Consistent with the results of Vielva et al. (2003) we find a...
We reconstruct the dark energy density $\rho_X(z)$ as a free function from current type Ia supernova (SN Ia) data (Tonry et al. 2003; Barris et al. 2003; Knop et al. 2003), together with the Cosmic...
COBE-DMR-Normalized Dark Energy Cosmogony (2003)
Mukherjee, Pia, Banday, Anthony J., Riazuelo, Alain, Górski, Krzysztof M., Ratra, Bharat
Likelihood analyses of the COBE-DMR sky maps are used to determine the normalization of the inverse-power-law-potential scalar field dark energy model. Predictions of the DMR-normalized model are...
Model-Independent Reconstruction of the Primordial Power Spectrum from WMAP Data (2003)
Reconstructing the shape of the primordial power spectrum in a model independent way from cosmological data is a useful consistency check on what is usually assumed regarding early universe physics....
Galactic Foreground Constraints from the Python V Cosmic Microwave Background Anisotropy Data (2003)
Mukherjee, Pia, Coble, Kim, Dragovan, Mark, Ganga, Ken, Kovac, John, Ratra, Bharat, ...
We constrain Galactic foreground contamination of the Python V cosmic microwave background anisotropy data by cross correlating it with foreground contaminant emission templates. To model foreground...
Direct Wavelet Expansion of the Primordial Power Spectrum (2003)
In order to constrain and possibly detect unusual physics during inflation, we allow the power spectrum of primordial matter density fluctuations, P_{in}(k), to be an arbitrary function in the...
Wavelet Band Powers of the Primordial Power Spectrum from CMB Data (2003)
Measuring the primordial matter power spectrum is our primary means of probing unknown physics in the very early universe. We allow the primordial power spectrum to be an arbitrary function, and...
Mukherjee, Pia, Ganga, Ken, Ratra, Bharat, Rocha, Graca, Souradeep, Tarun, Sugiyama, Naoshi, ...
We use joint likelihood analyses of combinations of fifteen cosmic microwave background (CMB) anisotropy data sets from the DMR, UCSB South Pole 1994, Python I--III, ARGO, MAX 4 and 5, White Dish,...
OVRO CMB Anisotropy Measurement Constraints on Flat-Lambda and Open CDM Cosmogonies (2002)
Mukherjee, Pia, Souradeep, Tarun, Ratra, Bharat, Sugiyama, Naoshi, Górski, Krzysztof M.
We use Owens Valley Radio Observatory (OVRO) cosmic microwave background (CMB) anisotropy data to constrain cosmological parameters. We account for the OVRO beamwidth and calibration uncertainties,...
Mukherjee, Pia, Dennison, Brian, Ratra, Bharat, Simonetti, John H., Ganga, Ken, Hamilton, Jean-Christophe
We study Galactic emission foreground contamination of the OVRO and UCSB South Pole 1994 cosmic microwave background (CMB) anisotropy data by cross-correlating with templates of infrared dust...