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• W2979401660 abstract "We consider scenarios where the inflaton field decays dominantly to a hidden dark matter (DM) sector. By studying the typical behavior of the Standard Model (SM) Higgs field during inflation, we derive a relation between the primordial tensor-to-scalar ratio $r$ and amplitude of the residual DM isocurvature perturbations $beta$ which is typically generated if the DM is thermally decoupled from the SM sector. We consider different expansion histories and find that if the Universe was radiation- or matter-dominated after inflation, a future discovery of primordial DM isocurvature will rule out all simple scenarios of this type because generating observable $beta$ from the Higgs is not possible without violating the bounds on $r$. Seen another way, the Higgs field is generically not a threat to models where both the inflaton and DM reside in a decoupled sector. However, this is not necessarily the case for an early kination-dominated epoch, as then the Higgs can source sizeable $beta$. We also discuss why the Higgs cannot source the observed curvature perturbation at large scales in any of the above cases but how the field can still be the dominant source of curvature perturbations at small scales." @default.
• W2979401660 created "2019-10-18" @default.
• W2979401660 creator A5007388772 @default.
• W2979401660 date "2019-10-11" @default.
• W2979401660 modified "2023-09-24" @default.
• W2979401660 title "Standard model Higgs field and hidden sector cosmology" @default.
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• W2979401660 doi "https://doi.org/10.1103/physrevd.100.083515" @default.
• W2979401660 hasPublicationYear "2019" @default.
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