Freeze-in Leptogenesis via Dark-Matter Oscillations

Abstract

We study the cosmology and phenomenology of freeze-in baryogenesis via dark-matter oscillations, taking the dark matter to couple to Standard Model leptons. We investigate viable models both with and without a $Z_2$ symmetry under which all new fields are charged. Lepton flavor effects are important for leptogenesis in these models, and we identify scenarios in which the baryon asymmetry is parametrically distinct from and enhanced relative to leptogenesis from sterile neutrino oscillations. The models we study predict the existence of new, electroweak-charged fields, and can be tested by a combination of collider searches, structure-formation studies, X-ray observations, and terrestrial low-energy tests.

24 pages + appendices, 21 figures; added a comment on thermal corrections to dark matter masses

References in corpus (14)

• Measurement of the Positive Muon Anomalous Magnetic Moment to 0.46 ppm
• The Dawn of FIMP Dark Matter: A Review of Models and Constraints
• The Sphaleron Rate in the Minimal Standard Model
• Sterile neutrinos, dark matter, and the pulsar velocities in models with a Higgs singlet
• Search for direct production of charginos, neutralinos and sleptons in final states with two leptons and missing transverse momentum in pp collisions at sqrt(s) = 8 TeV with the ATLAS detector
• Dark-matter sterile neutrinos in models with a gauge singlet in the Higgs sector
• Constraints from Ly-$\alpha$ forests on non-thermal dark matter including resonantly-produced sterile neutrinos
• New Constraints on Sterile Neutrino Dark Matter from $NuSTAR$ M31 Observations
• How warm are non-thermal relics? Lyman-$\alpha$ bounds on out-of-equilibrium dark matter
• Threshold Resummation for Slepton-Pair Production at Hadron Colliders
• Decaying dark matter search with NuSTAR deep sky observations
• Freeze-out of baryon number in low-scale leptogenesis
• Towards Cogenesis via Asymmetric Freeze-in: The $\chi$ Who Came-in from the Cold
• Baryogenesis and Dark Matter from Freeze-In