Dark radiation constraints on minicharged particles in models with a hidden photon

被引：185

作者：

Vogel, Hendrik ^{[1
]}

Redondo, Javier ^{[1
,2
]}

机构：

[1] Max Planck Inst Phys & Astrophys, D-80805 Munich, Germany

[2] Univ Munich, Arnold Sommerfeld Ctr, D-80333 Munich, Germany

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2014年 / 02期

关键词：

particle physics - cosmology connection; cosmological parameters from CMBR; cosmology of theories beyond the SM; cosmological neutrinos; MILLICHARGED PARTICLES; PRIMORDIAL ABUNDANCE; SECTOR; SEARCH; LIGHT; PROBE; PARAMETERS; TELESCOPE; NUMBER; MATTER;

D O I：

10.1088/1475-7516/2014/02/029

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We compute the thermalization of a hidden sector consisting of minicharged fermions (MCPs) and massless hidden photons in the early Universe. The precise measurement of the anisotropies of the cosmic microwave background (CMB) by Planck and the relic abundance of light nuclei produced during big bang nucleosynthesis (BBN) constrain the amount of dark radiation of this hidden sector through the effective number of neutrino species, N-eff. This study presents novel and accurate predictions of dark radiation in the strongly and weakly coupled regime for a wide range of model parameters. We give the value of N-eff for MCP masses between 100 keV and 10 GeV and minicharges in the range 10(-11) - 1. Our results can be used to constrain MCPs with the current data and they are also a valuable indicator for future experimental searches, should the hint for dark radiation manifest itself in the next release of Planck's data.

引用

页数：26

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