ITP |
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Teilchentee WS 2017/18
Seminar at the Institute for Theoretical Physics, Heidelberg University
on Thursdays, 4 pm
organizers: Stefan Floerchinger, Susanne Westhoff
Before each seminar, the speaker gives an informal Pre-Talk, introducing the MSc and PhD students at the ITP to the broader context of the topic of the seminar.
Pre-Talks start at 3:30 pm
Date: 26.10.2017
Speaker: Viviana Niro (ITP)
Title: Neutrino mass limits from galaxy surveys and implications for particle physics
Abstract
In this talk I'll first review the information that cosmology can provide on neutrino properties, in particular on the sum of neutrino masses. I'll then present constraints on neutrino masses obtained using information from galaxy surveys. In particular, I'll use galaxy power spectrum data from the WiggleZ Dark Energy Survey (WZ) and from the Luminous Red Galaxies (LRG) sample of the Sloan Digital Sky Survey-Data Release 7 (SDSS-DR7). I'll show how the constraints on neutrino masses, obtained using Planck temperature and polarisation measurements, are improved by the information on the full shape of the power spectrum. Adding also Baryon Acoustic Oscillations measurements, the constraints on neutrino masses are further improved, since these measurements help in breaking cosmological parameters degeneracies. The tighter upper limit (0.13 eV at 95% CL) is obtained using SDSS-DR7 LRG together with Baryon Acoustic Oscillations measurements and Planck data. This value is close to the one recently obtained using Lyman-alpha data. Finally, I'll outline the implications of these current bounds for particle physics and the interplay with laboratory experiments, such as tritium beta decay and neutrinoless double-beta decay experiments.
