Implications of the study of galaxy clusters and cosmic large-scale structure on neutrino masses and dark matter

International Conference on Astrophysics and Particle Physics

December 08-10, 2016 Dallas, Texas, USA

Hans Bohringer

Ludwig-Maximilians-Universit�¤t M�¼nchen, Germany

Posters & Accepted Abstracts: J Astrophys Aerospace Technol

Abstract :

Galaxy clusters are sensitive probes of the large-scale structure of the matter density distribution of the Universe and they allow to obtain observational constraints of the masses if neutrinos. X-ray observations provide currently the best means to detect and characterize galaxy clusters. Using a statistically complete sample of galaxy clusters detected in the ROSAT All-Sky X-ray survey, we constrain cosmological parameters, specifically the matter density and the amplitude of the largescale matter density fluctuations. A comparison of these results with the measurements of cosmic microwave background anisotropies with the Planck satellite show some tension, which implies less pronounced fluctuation amplitude of nearby largescale structure as compared to the predictions based on Planck and a pure LCDM model. Damping of fluctuations by neutrino dark matter provides a plausible explanation for this discrepancy. We discuss the constraints on the neutrino mass from these findings and from other measurements of the nearby large-scale structure of the Universe.

Biography :

Email: hxb@mpe.mpg.de