Gauge invariant cosmological perturbation theory for braneworlds (2007)
Riazuelo, Alain, Vernizzi, Filippo, Steer, Danièle, Durrer, Ruth
We derive the gauge invariant perturbation equations for a 5-dimensional bulk spacetime in the presence of a brane. The equations are derived in full generality, without specifying a particular...
Cosmic microwave background anisotropies seeded by incoherent sources (2007)
Riazuelo, Alain, Deruelle, Nathalie
The cosmic microwave background anisotropies produced by active seeds, such as topological defects, have been computed recently for a variety of models by a number of authors. In this paper we show...
What can we learn about dark energy evolution? (2006)
Douspis, Marian, Zolnierowski, Yves, Blanchard, Alain, Riazuelo, Alain
We examine some of the constraints that can be obtained on a two parameters model of dark energy in which the characteristic parameter of the equation of state $w (z) = P(z) / \rho (z)$ does not vary...
What can we learn about dark energy evolution? (2006)
Douspis, Marian, Zolnierowski, Yves, Blanchard, Alain, Riazuelo, Alain
We examine some of the constraints that can be obtained on a two parameters model of dark energy in which the characteristic parameter of the equation of state $w (z) = P(z) / \rho (z)$ does not vary...
Schimd, Carlo, Tereno, Ismael, Uzan, Jean-Philippe, Mellier, Yannick, Van Waerbeke, Ludovic, Semboloni, Elisabetta, ...
Dark energy can be investigated in two complementary ways, by considering either general parameterizations or physically well-defined models. Following the second route, we explore the constraints on...
What can we learn about dark energy evolution? (2006)
Douspis, Marian, Zolnierowski, Yves, Blanchard, Alain, Riazuelo, Alain
We examine some of the constraints that can be obtained on a two parameters model of dark energy in which the characteristic parameter of the equation of state $w (z) = P(z) / \rho (z)$ does not vary...
What can we learn about dark energy evolution? (2006)
Douspis, Marian, Zolnierowski, Yves, Blanchard, Alain, Riazuelo, Alain
We examine some of the constraints that can be obtained on a two parameters model of dark energy in which the characteristic parameter of the equation of state $w (z) = P(z) / \rho (z)$ does not vary...
What can we learn about dark energy evolution? (2006)
Douspis, Marian, Zolnierowski, Yves, Blanchard, Alain, Riazuelo, Alain
We examine some of the constraints that can be obtained on a two parameters model of dark energy in which the characteristic parameter of the equation of state $w (z) = P(z) / \rho (z)$ does not vary...
What can be learned about dark energy evolution? (2006)
Douspis, Marian, Zolnierowski, Yves, Blanchard, Alain, Riazuelo, Alain
We examine constraints obtained from SNIa surveys on a two parameter model of dark energy in which the equation of state $w (z) = P(z) / \rho (z)$ undergoes a transition over a period significantly...
Constraining Cosmic Topology with CMB Polarization (2006)
Riazuelo, Alain, Caillerie, Samuel, Lachièze-Rey, Marc, Lehoucq, Roland, Luminet, Jean-Pierre
Multiply connected space sections of the universe on a scale smaller than the horizon size can leave an imprint on cosmic microwave background polarization maps, in such a way that the so-called...
What can be learned about dark energy evolution? (2006)
Douspis, Marian, Zolnierowski, Yves, Blanchard, Alain, Riazuelo, Alain
We examine constraints obtained from SNIa surveys on a two parameter model of dark energy in which the equation of state $w (z) = P(z) / \rho (z)$ undergoes a transition over a period significantly...
What can be learned about dark energy evolution? (2006)
Douspis, Marian, Zolnierowski, Yves, Blanchard, Alain, Riazuelo, Alain
We examine constraints obtained from SNIa surveys on a two parameter model of dark energy in which the equation of state $w (z) = P(z) / \rho (z)$ undergoes a transition over a period significantly...
What can be learned about dark energy evolution? (2006)
Douspis, Marian, Zolnierowski, Yves, Blanchard, Alain, Riazuelo, Alain
We examine constraints obtained from SNIa surveys on a two parameter model of dark energy in which the equation of state $w (z) = P(z) / \rho (z)$ undergoes a transition over a period significantly...
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...
Exhaustive Study of Cosmic Microwave Background Anisotropies in Quintessential Scenarios (2005)
Brax, Philippe, Martin, Jerome, Riazuelo, Alain
Recent high precision measurements of the CMB anisotropies performed by the BOOMERanG and MAXIMA-1 experiments provide an unmatched set of data allowing to probe different cosmological models. Among...
Interacting dark matter disguised as Warm Dark Matter (2005)
Boehm, Celine, Riazuelo, Alain, Hansen, Steen H., Schaeffer, Richard
We explore some of the consequences of Dark Matter-photon interactions on structure formation, focusing on the evolution of cosmological perturbations and performing both an analytical and a...
Bounds on CDM and neutrino isocurvature perturbations from CMB and LSS data (2005)
Beltran, Maria, Garcia-Bellido, Juan, Lesgourgues, Julien, Riazuelo, Alain
Generic models for the origin of structure predict a spectrum of initial fluctuations with a mixture of adiabatic and isocurvature perturbations. Using the observed anisotropies of the cosmic...
Weak lensing in scalar-tensor theories of gravity (2004)
Schimd, Carlo, Uzan, Jean-Philippe, Riazuelo, Alain
This article investigates the signatures of various models of dark energy on weak gravitational lensing, including the complementarity of the linear and non-linear regimes. It investigates...
Bounds on CDM and neutrino isocurvature perturbations from CMB and LSS data (2004)
Beltran, Maria, Garcia-Bellido, Juan, Lesgourgues, Julien, Riazuelo, Alain
Generic models for the origin of structure predict a spectrum of initial fluctuations with a mixture of adiabatic and isocurvature perturbations. Using the observed anisotropies of the cosmic...
Bounds on CDM and neutrino isocurvature perturbations from CMB and LSS data (2004)
Beltran, Maria, Garcia-Bellido, Juan, Lesgourgues, Julien, Riazuelo, Alain
Generic models for the origin of structure predict a spectrum of initial fluctuations with a mixture of adiabatic and isocurvature perturbations. Using the observed anisotropies of the cosmic...
Bounds on CDM and neutrino isocurvature perturbations from CMB and LSS data (2004)
Beltran, Maria, Garcia-Bellido, Juan, Lesgourgues, Julien, Riazuelo, Alain
Generic models for the origin of structure predict a spectrum of initial fluctuations with a mixture of adiabatic and isocurvature perturbations. Using the observed anisotropies of the cosmic...
Well-proportioned universes suppress CMB quadrupole (2003)
Weeks, Jeffrey, Luminet, Jean-Pierre, Riazuelo, Alain, Lehoucq, Roland
A widespread myth asserts that all small universe models suppress the CMB quadrupole. In actual fact, some models suppress the quadrupole while others elevate it, according to whether their low-order...
Cosmic microwave background anisotropies in multi-connected flat spaces (2003)
Riazuelo, Alain, Weeks, Jeffrey, Uzan, Jean-Philippe, Lehoucq, Roland, Luminet, Jean-Pierre
This article investigates the signature of the seventeen multi-connected flat spaces in cosmic microwave background (CMB) maps. For each such space it recalls a fundamental domain and a set of...
Signature de divers modèles d'univers primordial dans les anisotropies du rayonnement fossile (2003)
Cette thèse porte sur l'étude de divers modèles d'univers primordial et leur observabilité dans les anisotropies du rayonnement fossile. Dans la première partie sont exposées les équations...
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...
Cosmic microwave background constraints on multi-connected spherical spaces (2003)
Uzan, Jean-Philippe, Riazuelo, Alain, Lehoucq, Roland, Weeks, Jeffrey
This article describes the Cosmic Microwave Background anisotropies expected in a closed universe with the topology of a lens space L(p,q) and with density parameter Omega_0 close to 1. It provides...
Simulating Cosmic Microwave Background maps in multi-connected spaces (2002)
Riazuelo, Alain, Uzan, Jean-Philippe, Lehoucq, Roland, Weeks, Jeffrey
This article describes the computation of cosmic microwave background anisotropies in a universe with multi-connected spatial sections and focuses on the implementation of the topology in standard...
Gauge invariant cosmological perturbation theory for braneworlds (2002)
Riazuelo, Alain, Vernizzi, Filippo, Steer, Danièle, Durrer, Ruth
We derive the gauge invariant perturbation equations for a 5-dimensional bulk spacetime in the presence of a brane. The equations are derived in full generality, without specifying a particular...
Interacting dark matter disguised as Warm Dark Matter (2002)
Boehm, Celine, Riazuelo, Alain, Hansen, Steen H., Schaeffer, Richard
We explore some of the consequences of Dark Matter-photon interactions on structure formation, focusing on the evolution of cosmological perturbations and performing both an analytical and a...
Interacting dark matter disguised as Warm Dark Matter (2002)
Boehm, Celine, Riazuelo, Alain, Hansen, Steen H., Schaeffer, Richard
We explore some of the consequences of Dark Matter-photon interactions on structure formation, focusing on the evolution of cosmological perturbations and performing both an analytical and a...
Interacting Dark Matter disguised as Warm Dark Matter (2001)
Boehm, Celine, Riazuelo, Alain, Hansen, Steen H., Schaeffer, Richard
We explore some of the consequences of Dark Matter-photon interactions on structure formation, focusing on the evolution of cosmological perturbations and performing both an analytical and a...
Cosmological observations in scalar-tensor quintessence (2001)
Riazuelo, Alain, Uzan, Jean-Philippe
The framework for considering the astronomical and cosmological observations in the context of scalar-tensor quintessence in which the quintessence field also accounts for a time dependence of the...
Quintessence with two energy scales (2001)
Brax, Philippe, Martin, Jerome, Riazuelo, Alain
We study quintessence models using low energy supergravity inspired from string theory. We consider effective supergravity with two scales m_S, the string scale, and m_PL, the Planck scale and show...
Signature de divers modèles d'univers primordial dans les anisotropies du rayonnement fossile (2000)
Cette thèse porte sur l'étude de divers modèles d'univers primordial et leur observabilité dans les anisotropies du rayonnement fossile. Dans la première partie sont exposées les équations...
Signature de divers modèles d'univers primordial dans les anisotropies du rayonnement fossile (2000)
Cette thèse porte sur l'étude de divers modèles d'univers primordial et leur observabilité dans les anisotropies du rayonnement fossile. Dans la première partie sont exposées les équations...
Signature de divers modèles d'univers primordial dans les anisotropies du rayonnement fossile (2000)
Cette thèse porte sur l'étude de divers modèles d'univers primordial et leur observabilité dans les anisotropies du rayonnement fossile. Dans la première partie sont exposées les équations...
Precision of inflationary predictions and recent CMB anisotropy data (2000)
Schwarz, Dominik J., Martin, Jerome, Riazuelo, Alain
Inflationary predictions of the cosmic microwave background anisotropy are often based on the slow-roll approximation. We study the precision of these predictions and compare them with the recent...
Slow-roll inflation and CMB anisotropy data (2000)
Martin, Jerome, Riazuelo, Alain, Schwarz, Dominik J.
We emphasize that the estimation of cosmological parameters from cosmic microwave background (CMB) anisotropy data, such as the recent high resolution maps from BOOMERanG and MAXIMA-1, requires...
Exhaustive Study of Cosmic Microwave Background Anisotropies in Quintessential Scenarios (2000)
Brax, Philippe, Martin, Jerome, Riazuelo, Alain
Recent high precision measurements of the CMB anisotropies performed by the BOOMERanG and MAXIMA-1 experiments provide an unmatched set of data allowing to probe different cosmological models. Among...
Cosmic microwave background anisotropies seeded by incoherent sources (2000)
Riazuelo, Alain, Deruelle, Nathalie
The cosmic microwave background anisotropies produced by active seeds, such as topological defects, have been computed recently for a variety of models by a number of authors. In this paper we show...
Quintessence and Gravitational Waves (2000)
Riazuelo, Alain, Uzan, Jean-Philippe
We investigate some aspects of quintessence models with a non-minimally coupled scalar field and in particular we show that it can behave as a component of matter with $-3 \lesssim P/\rho \lesssim...
Correlated mixtures of adiabatic and isocurvature cosmological perturbations (2000)
Riazuelo, Alain, Langlois, David
The Cosmic Microwave Background (CMB) anisotropies measurements can provide many clues about the Universe. Although the common belief is that they will allow a very precise measurement of the...
Exhaustive Study of Cosmic Microwave Background Anisotropies in Quintessential Scenarios (2000)
Brax, Philippe, Martin, Jerome, Riazuelo, Alain
Recent high precision measurements of the CMB anisotropies performed by the BOOMERanG and MAXIMA-1 experiments provide an unmatched set of data allowing to probe different cosmological models. Among...
Signature de divers modèles d'univers primordial dans les anisotropies du rayonnement fossile (2000)
Cette thèse porte sur l'étude de divers modèles d'univers primordial et leur observabilité dans les anisotropies du rayonnement fossile. Dans la première partie sont exposées les équations...
Exhaustive Study of Cosmic Microwave Background Anisotropies in Quintessential Scenarios (2000)
Brax, Philippe, Martin, Jerome, Riazuelo, Alain
Recent high precision measurements of the CMB anisotropies performed by the BOOMERanG and MAXIMA-1 experiments provide an unmatched set of data allowing to probe different cosmological models. Among...
Signature de divers modèles d'univers primordial dans les anisotropies du rayonnement fossile (2000)
Cette thèse porte sur l'étude de divers modèles d'univers primordial et leur observabilité dans les anisotropies du rayonnement fossile. Dans la première partie sont exposées les équations...
Signature de divers modèles d'univers primordial dans les anisotropies du rayonnement fossile (2000)
Cette thèse porte sur l'étude de divers modèles d'univers primordial et leur observabilité dans les anisotropies du rayonnement fossile. Dans la première partie sont exposées les équations...
Correlated mixtures of adiabatic and isocurvature cosmological perturbations (1999)
Langlois, David, Riazuelo, Alain
We examine the consequences of the existence of correlated mixtures of adiabatic and isocurvature perturbations on the CMB and large scale structure. In particular, we consider the four types of...
Topological Defects and CMB anisotropies : Are the predictions reliable ? (1999)
Riazuelo, Alain, Deruelle, Nathalie, Peter, Patrick
We consider a network of topological defects which can partly decay into neutrinos, photons, baryons, or Cold Dark Matter. We find that the degree-scale amplitude of the cosmic microwave background...
Uzan, Jean-Philippe, Deruelle, Nathalie, Riazuelo, Alain
We consider a perfectly homogeneous, isotropic and spatially flat universe which undergoes a sudden phase transition producing topological defects. We assume that these defects form a coherent...