Julien Lesgourgues

Massive neutrinos and cosmology

The present experimental results on neutrino flavour oscillations provide evidence for non-zero neutrino masses, but give no hint on their absolute mass scale, which is the target of beta decay and neutrinoless double-beta decay experiments. Crucial complementary information on neutrino masses can be obtained from the analysis of data on cosmological observables, such as the anisotropies of the cosmic microwave background or the distribution of large-scale structure. In this review we describe in detail how free-streaming massive neutrinos affect the evolution of cosmological perturbations. We summarize the current bounds on the sum of neutrino masses that can be derived from various combinations of cosmological data, including the most recent analysis by the WMAP team. We also discuss how future cosmological experiments are expected to be sensitive to neutrino masses well into the sub-eV range.

Constraining warm dark matter candidates including sterile neutrinos and light gravitinos with WMAP and the Lyman-alpha forest

The matter power spectrum at comoving scales of

The Cosmic Linear Anisotropy Solving System (CLASS). Part II: Approximation schemes

(1\ensuremath{-}40){h}^{\ensuremath{-}1}\text{ }\text{ }\mathrm{Mpc}

Lyman-alpha constraints on warm and on warm-plus-cold dark matter models

is very sensitive to the presence of Warm Dark Matter (WDM) particles with large free-streaming lengths. We present constraints on the mass of WDM particles from a combined analysis of the matter power spectrum inferred from the large samples of high-resolution high signal-to-noise Lyman-

Probing cosmological parameters with the CMB: Forecasts from Monte Carlo simulations

\ensuremath{\alpha}

Realistic sterile neutrino dark matter with keV mass does not contradict cosmological bounds.

forest data of Kim et al. (2004) and Croft et al. (2002) and the cosmic microwave background data of WMAP. We obtain a lower limit of

Probing neutrino masses with cmb lensing extraction

{m}_{\mathrm{WDM}}\ensuremath{\gtrsim}550\text{ }\text{ }\mathrm{eV}

Current cosmological bounds on neutrino masses and relativistic relics

(

The Cosmic Linear Anisotropy Solving System (CLASS) IV: efficient implementation of non-cold relics

2\ensuremath{\sigma}

Neutrino masses and cosmology with Lyman-alpha forest power spectrum

) for early decoupled thermal relics and