Axion–Sterile Neutrino Dark Matter

Universe

Alberto Salvio¹  Simone Scollo¹ 

[1] Physics Department, University of Rome Tor Vergata, Via Della Ricerca Scientifica, I-00133 Rome, Italy;

关键词: neutrinos;    axion;    inflation;   

DOI  :  10.3390/universe7100354

来源: DOAJ

【 摘 要 】

Extending the standard model with three right-handed neutrinos and a simple QCD axion sector can account for neutrino oscillations, dark matter and baryon asymmetry; at the same time, it solves the strong CP problem, stabilizes the electroweak vacuum and can implement critical Higgs inflation (satisfying all current observational bounds). We perform here a general analysis of dark matter (DM) in such a model, which we call the $a\nu$MSM. Although critical Higgs inflation features a (quasi) inflection point of the inflaton potential, we show that DM cannot receive a contribution from primordial black holes in the $a\nu$MSM. This leads to a multicomponent axion–sterile neutrino DM and allows us to relate the axion parameters, such as the axion decay constant, to the neutrino parameters. We include several DM production mechanisms: the axion production via misalignment and decay of topological defects as well as the sterile neutrino production through the resonant and non-resonant mechanisms and in the recently proposed CPT-symmetric universe.

【 授权许可】

Unknown