FIMP Dark Matter from Leptogenesis in Fast Expanding Universe

Abstract

Within the framework of canonical type-I seesaw, a feebly interacting massive particle (FIMP) $\chi$ is introduced as a dark matter candidate. The leptogenesis mechanism and dark matter relic density share a common origin via decays of Majorana neutrinos $N$. Provided an additional species $\phi$ whose energy density red-shifts as ${\rho }_{\phi }\propto a^{-(4+n)}$, the Hubble expansion rate is larger than the standard scenario, i.e., the Universe expands faster. The consequences of such a fast expanding Universe on leptogenesis as well as FIMP dark matter are investigated in detail. We demonstrate a significant impact on the final baryon asymmetry and dark matter abundance due to the existence of $\phi$ for the strong washout scenario. While for the weak washout scenario, the effects of FEU are relatively small. We introduce scale factors $F_L$ and $F_{\chi }$ to describe the corresponding effects of FEU. A semi-analytical approach to derive the efficiency factors ${\eta }_L$ and ${\eta }_{\chi }$ in FEU is also discussed. The viable parameter space for success thermal leptogenesis and correct FIMP DM relic density is obtained for standard cosmology and FEU. Our results show that it is possible to distinguish different cosmology scenarios for strong washout cases.

18 pages, 7 figures

References in corpus (12)

• Observation of electron-antineutrino disappearance at Daya Bay
• Leptogenesis
• Primordial Nucleosynthesis: from precision cosmology to fundamental physics
• Asymmetric Dark Matter from Leptogenesis
• Common Origin of Neutrino Mass, Dark Matter, and Baryogenesis
• Imprint of the seesaw mechanism on feebly interacting dark matter and the baryon asymmetry
• Freeze-in produced dark matter in the ultra-relativistic regime
• Feeble neutrino portal dark matter at neutrino detectors
• Seesaw determination of the dark matter relic density
• Predictive Scotogenic Model with Flavor Dependent Symmetry
• Baryogenesis via Leptogenesis: Spontaneous B and L Violation
• Freeze-In Dark Matter within the Seesaw mechanism

Cited by in corpus (8)

• Non-thermal Origin of Asymmetric Dark Matter from Inflaton and Primordial Black Holes
• WIMPy Leptogenesis in Non-Standard Cosmologies
• Baryon asymmetry and lower bound on right handed neutrino mass in fast expanding Universe: an analytical approach
• Sterile Neutrino Portal Dark Matter in $\nu$THDM
• Reviewing the prospect of fermion triplets as dark matter and source of baryon asymmetry in non-standard cosmology
• Spontaneously stabilised dark matter from a fermiophobic $U(1{)}^{\prime }$ gauge symmetry
• Minimal Leptogenesis in Brane-inspired Cosmology
• Magnetogenesis From Baryon Asymmetry During an Early Matter Dominated Era