BBN with light dark matter
Cosmology and Nongalactic Astrophysics
2015-06-12 v2 High Energy Physics - Phenomenology
Abstract
Effects of light millicharged dark matter particles on primordial nucleosynthesis are considered. It is shown that if the mass of such particles is much smaller than the electron mass, they lead to strong overproduction of Helium-4. An agreement with observations can be achieved by non-vanishing lepton asymmetry. Baryon-to-photon ratio at BBN and neutrino- to-photon ratio both at BBN and at recombination are noticeably different as compared to the standard cosmological model. The latter ratio and possible lepton asymmetry could be checked by Planck. For higher mass of new particles the effect is much less pronounced and may even have opposite sign.
Cite
@article{arxiv.1211.4937,
title = {BBN with light dark matter},
author = {Zurab Berezhiani and Aleksander Dolgov and Igor Tkachev},
journal= {arXiv preprint arXiv:1211.4937},
year = {2015}
}
Comments
Replaced with the version accepted for publication in JCAP