Cosmic microwave background bispectrum on small angular scales (2008)
Pitrou, Cyril, Uzan, Jean-Philippe, Bernardeau, Francis
This article investigates the non-linear evolution of cosmological perturbations on sub-Hubble scales in order to evaluate the unavoidable deviations from Gaussianity that arise from the non-linear...
Multi-Point Propagators in Cosmological Gravitational Instability (2008)
Bernardeau, Francis, Crocce, Martin, Scoccimarro, Roman
We introduce the concept of multi-point propagators between linear cosmic fields and their nonlinear counterparts in the context of cosmological perturbation theory. Such functions express how a...
Propagators in Lagrangian space (2008)
Bernardeau, Francis, Valageas, Patrick
It has been found recently that propagators, e.g. the cross-correlation spectra of the cosmic fields with the initial density field, decay exponentially at large-k in an Eulerian description of the...
Time drift of cosmological redshifts and its variance (2007)
Uzan, Jean-Philippe, Bernardeau, Francis, Mellier, Yannick
The contribution of cosmological perturbations to the time drift of the cosmological redshift is derived. It is shown that the dominant correction arises from the local acceleration of both the...
Non-Gaussianities in extended D-term inflation (2007)
Bernardeau, Francis, Brunier, Tristan
We explore extensions of hybrid inflationary models in the context of supersymmetric D-term inflation. We point out that a large variety of inflationary scenarios can be encountered when the field...
Lensing at cosmological scales: a test of higher dimensional gravity (2006)
Uzan, Jean-Philippe, Bernardeau, Francis
Recent developments in gravitational lensing astronomy have paved the way to genuine mappings of the gravitational potential at cosmological scales. We stress that comparing these data with...
Models of inflation with primordial non-Gaussianities (2006)
Bernardeau, Francis, Brunier, Tristan, Uzan, Jean-Philippe
We present a class of models in which the primordial metric fluctuations do not necessarily obey Gaussian statistics. These models are realizations of mechanisms in which non-Gaussianity is first...
With the developments of large galaxy surveys or cosmic shear surveys it is now possible to map the dark matter distribution at truly cosmological scales. Detailed examinations of the statistical...
High order correlation functions for self interacting scalar field in de Sitter space (2005)
Bernardeau, Francis, Brunier, Tristan, Uzan, Jean-Philippe
We present the expressions of the three- and four-point correlation functions of a self interacting light scalar field in a de Sitter spacetime at tree order respectively for a cubic and a quartic...
Finite volume effects for non-Gaussian multi-field inflationary models (2005)
Bernardeau, Francis, Uzan, Jean-Philippe
Models of multi-field inflation exhibiting primordial non-Gaussianity have recently been introduced. This is the case in particular if the fluctuations of a light field scalar field, transverse to...
Inflationary models inducing non-Gaussian metric fluctuations (2005)
Bernardeau, Francis, Uzan, Jean-Philippe
We construct explicit models of multi-field inflation in which the primordial metric fluctuations do not necessarily obey Gaussian statistics. These models are realizations of mechanisms in which...
Cosmic Strings Lens Phenomenology Revisited (2005)
Bernardeau, Francis, Uzan, Jean-Philippe
We present investigations of lens phenomenological properties of cosmic strings for deep galaxy surveys. General results that have obtained for lineic energy distribution are presented first. We...
Cosmic Strings Lens Phenomenology: Model of Poisson Energy Distribution (2005)
Bernardeau, Francis, Uzan, Jean-Philippe
We present a novel approach for investigating lens phenomenology of cosmic strings in order to elaborate detection strategies in galaxy deep field images. To account for the complexity of the...
With the developments of large galaxy surveys or cosmic shear surveys it is now possible to map the dark matter distribution at truly cosmological scales. Detailed examinations of the statistical...
Constraints on mode couplings and modulation of the CMB with WMAP data (2004)
Prunet, Simon, Uzan, Jean-Philippe, Bernardeau, Francis, Brunier, Tristan
We investigate a possible asymmetry in the statistical properties of the cosmic microwave background temperature field and to do so we construct an estimator aiming at detecting a dipolar modulation....
Modulated fluctuations from hybrid inflation (2004)
Bernardeau, Francis, Kofman, Lev, Uzan, Jean-Philippe
Inflation universally produces classical almost scale free Gaussian inhomogeneities of any light scalars. Assuming the coupling constants at the time of inflation depend on some light moduli fields,...
With the developments of large galaxy surveys or cosmic shear surveys it is now possible to map the dark matter distribution at truly cosmological scales. Detailed examinations of the statistical...
With the developments of large galaxy surveys or cosmic shear surveys it is now possible to map the dark matter distribution at truly cosmological scales. Detailed examinations of the statistical...
Finite volume effects for non-Gaussian multi-field inflationary models (2003)
Bernardeau, Francis, Uzan, Jean-Philippe
Models of multi-field inflation exhibiting primordial non-Gaussianity have recently been introduced. This is the case in particular if the fluctuations of a light field scalar field, transverse to...
High order correlation functions for self interacting scalar field in de Sitter space (2003)
Bernardeau, Francis, Brunier, Tristan, Uzan, Jean-Philippe
We present the expressions of the three- and four-point correlation functions of a self interacting light scalar field in a de Sitter spacetime at tree order respectively for a cubic and a quartic...
High order correlation functions for self interacting scalar field in de Sitter space (2003)
Bernardeau, Francis, Brunier, Tristan, Uzan, Jean-Philippe
We present the expressions of the three- and four-point correlation functions of a self interacting light scalar field in a de Sitter spacetime at tree order respectively for a cubic and a quartic...
Finite volume effects for non-Gaussian multi-field inflationary models (2003)
Bernardeau, Francis, Uzan, Jean-Philippe
Models of multi-field inflation exhibiting primordial non-Gaussianity have recently been introduced. This is the case in particular if the fluctuations of a light field scalar field, transverse to...
High order correlation functions for self interacting scalar field in de Sitter space (2003)
Bernardeau, Francis, Brunier, Tristan, Uzan, Jean-Philippe
We present the expressions of the three- and four-point correlation functions of a self interacting light scalar field in a de Sitter spacetime at tree order respectively for a cubic and a quartic...
Finite volume effects for non-Gaussian multi-field inflationary models (2003)
Bernardeau, Francis, Uzan, Jean-Philippe
Models of multi-field inflation exhibiting primordial non-Gaussianity have recently been introduced. This is the case in particular if the fluctuations of a light field scalar field, transverse to...
Inflationary models inducing non-Gaussian metric fluctuations (2002)
Bernardeau, Francis, Uzan, Jean-Philippe
We construct explicit models of multi-field inflation in which the primordial metric fluctuations do not necessarily obey Gaussian statistics. These models are realizations of mechanisms in which...
Non-Gaussianity in multi-field inflation (2002)
Bernardeau, Francis, Uzan, Jean-Philippe
This article investigates the generation of non-Gaussianity during inflation. In the context of multi-field inflation, we detail a mechanism that can create significant primordial non-Gaussianities...
Inflationary models inducing non-Gaussian metric fluctuations (2002)
Bernardeau, Francis, Uzan, Jean-Philippe
We construct explicit models of multi-field inflation in which the primordial metric fluctuations do not necessarily obey Gaussian statistics. These models are realizations of mechanisms in which...
Inflationary models inducing non-Gaussian metric fluctuations (2002)
Bernardeau, Francis, Uzan, Jean-Philippe
We construct explicit models of multi-field inflation in which the primordial metric fluctuations do not necessarily obey Gaussian statistics. These models are realizations of mechanisms in which...
Source-lens clustering effects on the skewness of the lensing convergence (2000)
Hamana, Takashi, Colombi, Stephane T., Thion, Aurelien, Mellier, Yannick, Bernardeau, Francis
The correlation between source galaxies and lensing potentials causes a systematic effect on measurements of cosmic shear statistics, known as the source-lens clustering (SLC) effect. The SLC effect...
Lensing at cosmological scales: a test of higher dimensional gravity (2000)
Uzan, Jean-Philippe, Bernardeau, Francis
Recent developments in gravitational lensing astronomy have paved the way to genuine mappings of the gravitational potential at cosmological scales. We stress that comparing these data with...
Cosmic Strings Lens Phenomenology Revisited (2000)
Bernardeau, Francis, Uzan, Jean-Philippe
We present investigations of lens phenomenological properties of cosmic strings for deep galaxy surveys. General results that have obtained for lineic energy distribution are presented first. We...
Cosmic Strings Lens Phenomenology: Model of Poisson Energy Distribution (2000)
Bernardeau, Francis, Uzan, Jean-Philippe
We present a novel approach for investigating lens phenomenology of cosmic strings in order to elaborate detection strategies in galaxy deep field images. To account for the complexity of the...
Cosmic Strings Lens Phenomenology: General Properties of Distortion Fields (2000)
Uzan, Jean-Philippe, Bernardeau, Francis
We reconsider the general properties of gravitational lensing effects induced by cosmic string systems, taking into account their equation of state and motion equations. We explicitly show that the...
Cosmic Strings Lens Phenomenology Revisited (2000)
Bernardeau, Francis, Uzan, Jean-Philippe
We present investigations of lens phenomenological properties of cosmic strings for deep galaxy surveys. General results that have obtained for lineic energy distribution are presented first. We...
Cosmic Strings Lens Phenomenology: Model of Poisson Energy Distribution (2000)
Bernardeau, Francis, Uzan, Jean-Philippe
We present a novel approach for investigating lens phenomenology of cosmic strings in order to elaborate detection strategies in galaxy deep field images. To account for the complexity of the...
Cosmic Strings Lens Phenomenology Revisited (2000)
Bernardeau, Francis, Uzan, Jean-Philippe
We present investigations of lens phenomenological properties of cosmic strings for deep galaxy surveys. General results that have obtained for lineic energy distribution are presented first. We...
Cosmic Strings Lens Phenomenology: Model of Poisson Energy Distribution (2000)
Bernardeau, Francis, Uzan, Jean-Philippe
We present a novel approach for investigating lens phenomenology of cosmic strings in order to elaborate detection strategies in galaxy deep field images. To account for the complexity of the...
Velocity Field Statistics and Tessellation Techniques: Unbiased Estimators of $\Omega$ (1998)
Van De Weygaert, Rien, Bernardeau, Francis
We describe two new -- stochastic-geometrical -- methods to obtain reliable velocity field statistics from N-body simulations and from any general density and velocity fluctuation field sampled at a...
The Statistics of the large-scale Velocity Field (1996)
A lot of predictions for the statistical properties of the cosmic velocity field at large-scale have been obtained recently using perturbation theory. In this contribution I report the outcomes of a...
A new method for accurate velocity statistics estimation (1995)
Bernardeau, Francis, Van De Weygaert, Rien
We introduce two new methods to obtain reliable velocity field statistics from N-body simulations, or indeed from any general density and velocity fluctuation field sampled by discrete points. These...