Program

O.4 -- Oral, NCTP-42

Date: Monday, 31 July 2017

Time: 11h40 - 12h00

Neutrino Statistics and Current Cosmological Tensions

Truong Xuan Nhut (1,2), Marco Laveder (3), Stefano Gariazzo (4)

(1): Institute For Interdisciplinary Research in Science and Education (IFIRSE) (2): University of Rome 'Tor Vergata' (3): University of Padova (4) University of Valencia

Recent results from observations of the Cosmic Microwave Background (CMB) exhibit tensions with those obtained from astrophysical observations in the local Universe. In particular, CMB data from the Planck mission appears to prefer a significantly lower value of the current expansion rate (H0) than the one obtained from type Ia Supernovae Surveys (i.e. Riess et al. 2016). On the other hand, the Planck CMB predicts a higher value of the present-day amplitude of matter fluctuations, parametrized by the parameter sigma_8, with respect to the value derived from the Planck Sunyaev-Zeldovich Clusters observations. We seek for solution for the above tensions by provoking non-standard features from the neutrino sector. In our phenomenological study, which is motivated by previous works from particle physics side (Dolgov & Smirnov 2005, Dolgov et al. 2005), we consider a Lambda-CDM model in which neutrinos obey a mixed-statistics instead of the Fermi-Dirac distribution. In this talk, I will present our preliminary results, for the first time, on the power of current cosmological data, i.e. CMB, BAO, in constraining the neutrino statistics as well as its potential in solving the aforementioned tensions.

Presenter: Truong Xuan Nhut