Dark Radiation from a hidden U(1)
High Energy Physics - Phenomenology
2015-04-24 v1
Abstract
We discuss the impact of a hidden sector consisting of Minicharged Particles (MCPs) and massless hidden photons on the expansion history of our Universe. We present parameter scans for the amount of extra relativistic particles (Neff) and the abundance of light nuclei for fermionic MCPs with masses between ~100 keV and 10 GeV and minicharges in the range 10^(-11)-1. Current CMB and BBN data significantly constrain the available parameter space of MCPs. The shown results are a valuable indicator for future experimental searches and are presented in a flexible way so that more accurate results on Neff can be easily interpreted.
Keywords
Cite
@article{arxiv.1504.06222,
title = {Dark Radiation from a hidden U(1)},
author = {Hendrik Vogel and Javier Redondo},
journal= {arXiv preprint arXiv:1504.06222},
year = {2015}
}
Comments
Contributed to the 10th Patras Workshop on Axions, WIMPs and WISPs, CERN, June 29 to July 4, 2014