Publications by Jan Hamann | EPFL Graph Search

A White Paper on keV sterile neutrino Dark Matter

Laurent Gastaldo, Igor Tkachev, Alexey Boyarsky, Oleg Ruchayskiy, Julien Lesgourgues, Marco Drewes, Antoine Pierre Emmanuel Alexis Merle, Jan Hamann, Jonathan Leon Wolf

We present a comprehensive review of keV-scale sterile neutrino Dark Matter, collecting views and insights from all disciplines involved - cosmology, astrophysics, nuclear, and particle physics - in each case viewed from both theoretical and experimental/o ...

Iop Publishing Ltd2017

Planck 2013 results. XVI. Cosmological parameters

Julien Lesgourgues, Fabio Finelli, Jan Hamann, Xin Chen

This paper presents the first cosmological results based on Planck measurements of the cosmic microwave background (CMB) temperature and lensing-potential power spectra. We find that the Planck spectra at high multipoles (l greater than or similar to 40) a ...

Edp Sciences S A2014

Planck 2013 results. I. Overview of products and scientific results

Slobodan Ilic, Julien Lesgourgues, Fabio Finelli, Jason Douglas McEwen, Jan Hamann, Ji Hyun Kim, Xin Chen

The European Space Agency's Planck satellite, dedicated to studying the early Universe and its subsequent evolution, was launched 14 May 2009 and has been scanning the microwave and submillimetre sky continuously since 12 August 2009. In March 2013, ESA an ...

Edp Sciences S A2014

Planck 2013 results. XXII. Constraints on inflation

Julien Lesgourgues, Fabio Finelli, Jan Hamann, Jean-Luc Starck

We analyse the implications of the Planck data for cosmic inflation. The Planck nominal mission temperature anisotropy measurements, combined with the WMAP large-angle polarization, constrain the scalar spectral index to be n(s) = 0.9603 +/- 0:0073, ruling ...

EDP Sciences2014

Single-field inflation constraints from CMB and SDSS data

Julien Lesgourgues, Fabio Finelli, Jan Hamann

We present constraints on canonical single-field inflation derived from WMAP five year, ACBAR, QUAD, BICEP data combined with the halo power spectrum from SDSS LRG7. Models with a non-scale-invariant spectrum and a red tilt n(S) < 1 are now preferred over ...

2010

Cosmological parameters from large scale structure - geometric versus shape information

Julien Lesgourgues, Jan Hamann

The matter power spectrum as derived from large scale structure (LSS) surveys contains two important and distinct pieces of information: an overall smooth shape and the imprint of baryon acoustic oscillations (BAO). We investigate the separate impact of th ...

2010

Optimising Boltzmann codes for the PLANCK era

Julien Lesgourgues, Jan Hamann

High precision measurements of the Cosmic Microwave Background (CMB) anisotropies, as can be expected from the PLANCK satellite, will require high-accuracy theoretical predictions as well. One possible source of theoretical uncertainty is the numerical err ...

2009