2012/11/30 by Zurab Berezhiani, Aleksander Dolgov, Igor Tkachev · 2 citations
Computer Science · Physics and Astronomy · #Asymmetry #Big Bang nucleosynthesis #Computational Physics and Python Applications #Cosmology #Dark Matter and Cosmic Phenomena #Dark matter #Lepton #Light dark matter #Nucleosynthesis #Particle physics theoretical and experimental studies #Recombination #Standard Model (mathematical formulation) #astro-ph.CO #hep-ph
paper · pdf · doi:10.1088/1475-7516/2013/02/010
Replaced with the version accepted for publication in JCAP
arxiv created 2013/01/14 · openalex publication_date 2013/02/05 · arxiv updated 2015/06/12 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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.