Dark Radiation from a hidden U(1)
Hendrik Vogel, Javier Redondo
TL;DR
This paper investigates how a hidden sector with minicharged particles and hidden photons affects the universe's expansion, constraining their properties using current cosmological data and guiding future searches.
Contribution
It provides a comprehensive parameter scan of minicharged particles' effects on cosmology, offering a flexible framework for interpreting future experimental results.
Findings
Current CMB and BBN data strongly constrain MCP parameters.
The results inform future experimental searches for hidden sector particles.
A flexible analysis framework for Neff contributions is presented.
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.
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Taxonomy
TopicsDark Matter and Cosmic Phenomena · Particle physics theoretical and experimental studies · Cosmology and Gravitation Theories