Abstract
We discuss inflation and dark matter in the inert doublet model coupled non-minimally to gravity where the inert doublet is the inflaton and the neutral scalar part of the doublet is the dark matter candidate. We calculate the various inflationary parameters like ns, r and Ps and then proceed to the reheating phase where the inflaton decays into the Higgs and other gauge bosons which are non-relativistic owing to high effective masses. These bosons further decay or annihilate to give relativistic fermions which are finally responsible for reheating the universe. At the end of the reheating phase, the inert doublet which was the inflaton enters into thermal equilibrium with the rest of the plasma and its neutral component later freezes out as cold dark matter with a mass of about 2 TeV.
Highlights
The modelWe will use the inert doublet model coupled non-minimally to gravity where there is an extra doublet Φ2 apart from the Higgs doublet Φ1
JHEP11(2017)080 hand Starobinsky models have exponential potentials
We calculate the various inflationary parameters like ns, r and Ps and proceed to the reheating phase where the inflaton decays into the Higgs and other gauge bosons which are non-relativistic owing to high effective masses
Summary
We will use the inert doublet model coupled non-minimally to gravity where there is an extra doublet Φ2 apart from the Higgs doublet Φ1. The extra doublet is inert in the sense that it does not have any Yukawa like couplings because of an inherent Z2 symmetry under which this doublet is odd (Φ2 → −Φ2) while the Higgs and other standard model particles are even (Φ1, ψ → Φ1, ψ, where ψ stands for SM particles other than Higgs). A choice where λ1 and ξ1 are of the same order while λ2 ∼ 1 ξ2 automatically satisfies this condition
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