Abstract
The nature of dark matter (DM) particles and the mechanism that provides their measured relic abundance are currently unknown. Likewise, the nature of the inflaton is unknown as well. We investigate the triplet seesaw model in an unified picture. At high energy scale, we consider Higgs inflation driven by an admixture of standard model and triplet Higgs fields, both coupled non–minimally to gravity. At intermediate and low energies we investigate vector like fermion doublet DM candidates with a charge asymmetry in the dark sector, which is generated by the same mechanism that provides the baryon asymmetry, namely baryogenesis–via–leptogenesis induced by the decay of scalar triplets. At the same time the model gives rise to neutrino masses in the ballpark of oscillation experiments via type–II seesaw. We then apply Bayesian statistics to infer the model parameters giving rise to the observed baryon asymmetry and DM density, compatibly with inflationary and DM direct detection constraints, updated with the CRESST–II excess, the new XENON100 data release and KIMS exclusion limit.
Highlights
A widely accepted theory describing the early universe is inflation and many realization of it have been modeled
In these Proceedings we have discussed an extension of the standard model (SM) with two heavy triplet scalars whose partial decay to SM leptons and inert doublet scalars (χ) or vector like fermions (ψ), could explain a common origin of asymmetric dark matter and visible matter through the leptogenesis mechanism
Regarding the dark matter (DM) phenomenology, odd under a Z2 symmetry and stable, for the scalar candidate fast oscillations between χ0 and χ0 strongly deplete the asymmetry below EW symmetry breaking scale
Summary
A widely accepted theory describing the early universe is inflation and many realization of it have been modeled (see e.g. [1, 2] for a review). The Higgs boson has been suggested as inflaton [3] by means of a non-minimal coupling to gravity ξH : inflation will occur at the unitarity scale Mpl/ξH 1014 GeV. In case of a scalar DM χ0 any asymmetry in the DM sector gets washed out below electroweak (EW) phase transition by fast oscillations between χ0 and its complex conjugate field χ0 This sets a limit of the mass scale of χ0 to be Mχ0 ≡ mDM ≥ 2 TeV, so that the DM freezes out before oscillations begin to occur. Since the triplet is at a scale of 108 GeV, the inflationary constraints loosely bound the EW parameters, while λ∆ or λH∆ are unaccessible at the low energy of the Large Hadron Collider (LHC)
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