2 research outputs found
Unifying darko-lepto-genesis with scalar triplet inflation
We present a scalar triplet extension of the standard model to unify the
origin of inflation with neutrino mass, asymmetric dark matter and
leptogenesis. In presence of non-minimal couplings to gravity the scalar
triplet, mixed with the standard model Higgs, plays the role of inflaton in the
early Universe, while its decay to SM Higgs, lepton and dark matter
simultaneously generate an asymmetry in the visible and dark matter sectors. On
the other hand, in the low energy effective theory the induced vacuum
expectation value of the triplet gives sub-eV Majorana masses to active
neutrinos. We investigate the model parameter space leading to successful
inflation as well as the observed dark matter to baryon abundance. Assuming the
standard model like Higgs mass to be at 125-126 GeV, we found that the mass
scale of the scalar triplet to be ~ O(10^9) GeV and its trilinear coupling to
doublet Higgs is ~ 0.09 so that it not only evades the possibility of having a
metastable vacuum in the standard model, but also lead to a rich
phenomenological consequences as stated above. Moreover, we found that the
scalar triplet inflation strongly constrains the quartic couplings, while
allowing for a wide range of Yukawa couplings which generate the CP asymmetries
in the visible and dark matter sectors.Comment: (v1) 29 pages, 11 figures; (v2) 30 pages, 1 figure added and
discussions expanded, to appear in Nuclear Physics
Asymmetric Inelastic Inert Doublet Dark Matter from Triplet Scalar Leptogenesis
The nature of dark matter (DM) particles and the mechanism that provides
their measured relic abundance are currently unknown. In this paper we
investigate inert scalar and 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 decays 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 discuss possible sources of depletion of asymmetry in the DM and visible
sectors and solve the relevant Boltzmann equations for quasi-equilibrium decay
of triplet scalars. A Monte-Carlo-Markov-Chain analysis is performed for the
whole parameter space. The survival of the asymmetry in the dark sector leads
to inelastic scattering off nuclei. We then apply bayesian statistic to infer
the model parameters favoured by the current experimental data, in particular
the DAMA annual modulation and Xenon100 exclusion limit. The latter strongly
disfavours asymmetric scalar doublet DM of mass \mathcal{O}(\TeV) as required
by DM- oscillations, while an asymmetric vector like fermion
doublet DM with mass around 100 GeV is a good candidate for DAMA annual
modulation yet satisfying the constraints from Xenon100 data.Comment: 35 pages and 15 figures, references adde