2014/12/26 by Sin Kyu Kang, Ayon Patra
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Asymmetry #Baryon asymmetry #Dark Matter and Cosmic Phenomena #Dark matter #Leptogenesis #Lepton #Neutrino #Particle physics theoretical and experimental studies #Standard Model (mathematical formulation) #Sterile neutrino #Yukawa potential #hep-ph
paper · pdf · doi:10.3938/jkps.69.1375
15 pages, 3 figures
arxiv created 2014/12/26 · openalex created_date 2016/06/24 · openalex publication_date 2016/10/01 · arxiv updated 2018/01/17 · openalex updated_date 2026/08/05
We consider a simple extension of the Standard Model to consistently explain the observation of a peak in the galactic X-ray spectrum at 3.55 keV, the light neutrino masses, and the baryon asymmetry of the universe. The baryon asymmetry is generated through leptogenesis, the lepton asymmetry being generated by the decay of a heavy neutrino with a TeV mass scale. The extra singlet fermion introduced in the model can be identified as a dark matter candidate with a mass of 7.1 keV. It decays with a lifetime much larger than the age of the universe, producing a final state photon. The Yukawa interactions between the extra singlet neutrino and a heavier right-handed neutrino play a crucial role in simultaneously achieving low-scale leptogenesis and the relic density of the keV dark matter candidate.