Publications associées à Planck 2013 results. XXVI. Background geometry and topology of the Universe

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Conservative constraints on early cosmology with MONTE PYTHON

Julien Lesgourgues, Benjamin Audren

Models for the latest stages of the cosmological evolution rely on a less solid theoretical and observational ground than the description of earlier stages like BBN and recombination. As suggested in a previous work by Vonlanthen et al., it is possible to ...

Iop Publishing Ltd2013

Optimal polarisation equations in FLRW universes

Julien Lesgourgues

This paper presents the linearised Boltzmann equation for photons for scalar, vector and tensor perturbations in flat, open and closed FLRW cosmologies. We show that E- and B-mode polarisation for all types can be computed using only a single hierarchy. Th ...

Iop Publishing Ltd2013

Low-l CMB analysis and inpainting

Jean-Luc Starck, Anaïs Marie Rassat

Reconstructing the cosmic microwave background (CMB) in the Galactic plane is extremely difficult due to the dominant foreground emissions such as dust, free-free or synchrotron. For cosmological studies, the standard approach consists in masking this area ...

Edp Sciences S A2013

Sparsity and the Bayesian perspective

Jean-Luc Starck, Anaïs Marie Rassat

Sparsity has recently been introduced in cosmology for weak-lensing and cosmic microwave background (CMB) data analysis for different applications such as denoising, component separation, or inpainting (i.e., filling the missing data or the mask). Although ...

Edp Sciences S A2013

A naturally light dilaton

Riccardo Rattazzi, Duccio Pappadopulo, Paolo Lodone, Lorenzo Vitale

Goldstone's theorem does not apply straightforwardly to the case of spontaneously broken scale invariance. We elucidate under what conditions a light scalar degree of freedom, identifiable with the dilaton, can naturally arise. Our construction can be cons ...

Springer2013

Normal generation of locally compact groups

Nicolas Monod, Amichai Netanel Eisenmann

It is a well-known open problem since the 1970s whether a finitely generated perfect group can be normally generated by a single element or not. We prove that the topological version of this problem has an affirmative answer as long as we exclude infinite ...

Oxford Univ Press2013

Neutrino Mass from Cosmology

Julien Lesgourgues

Neutrinos can play an important role in the evolution of the universe, modifying some of the cosmological observables. In this contribution we summarize the main aspects of cosmological relic neutrinos, and we describe how the precision of present cosmolog ...

Hindawi Publishing Corporation2012

Spherical 3D isotropic wavelets

Jean-Luc Starck, Anaïs Marie Rassat

Context. Future cosmological surveys will provide 3D large scale structure maps with large sky coverage, for which a 3D spherical Fourier-Bessel (SFB) analysis in spherical coordinates is natural. Wavelets are particularly well-suited to the analysis and d ...

2012

Planck 2013 results. XXVI. Background geometry and topology of the Universe

Graph Chatbot

Chattez avec Graph Search

Conservative constraints on early cosmology with MONTE PYTHON

Optimal polarisation equations in FLRW universes

Low-l CMB analysis and inpainting

Sparsity and the Bayesian perspective

A naturally light dilaton

Normal generation of locally compact groups

Neutrino Mass from Cosmology

Higgs-Dilaton cosmology: Are there extra relativistic species?

3D spherical analysis of baryon acoustic oscillations

Spherical 3D isotropic wavelets

Sparsity and the Bayesian perspective

Neutrino Mass from Cosmology

3D spherical analysis of baryon acoustic oscillations

Spherical 3D isotropic wavelets

Low-l CMB analysis and inpainting

Normal generation of locally compact groups

A naturally light dilaton

Conservative constraints on early cosmology with MONTE PYTHON

Optimal polarisation equations in FLRW universes

Higgs-Dilaton cosmology: Are there extra relativistic species?