First constraints on Non-minimally coupled Natural and Coleman-Weinberg inflation in the light of massive neutrino self-interactions and Planck+BICEP/Keck
arxiv(2023)
摘要
In this work, for the first time in literature, we compare the predictions of
non-minimally coupled Natural and Coleman-Weinberg potentials in the n_s-r
plane against the constraints from the latest cosmological data in an extended
ΛCDM model where we include non-standard self-interactions among
massive neutrinos, mediated by a heavy scalar or vector boson. For the
inflationary potentials, we consider two different formulations in gravity that
are non-minimally coupled to the scalar field of the inflaton: Metric
and Palatini. We only consider the self-interaction to be present among
τ-neutrinos and only at moderate strengths. This is because strong
interactions among τ-neutrinos, or any strength self-interaction among
electron- and muon-neutrinos, as well as any strength flavor-universal
interactions, are strongly disfavoured from particle physics experiments.
In terms of cosmological data, we use the latest public CMB datasets from
Planck and BICEP/Keck collaborations, along with other data from CMB lensing,
BAO, RSD, and SNe Ia luminosity distance measurements. We find that there are
some situations where predictions from the inflationary models are ruled out at
more than 2σ by the minimal ΛCDM+r model, but they are allowed
in the self-interacting neutrino scenario.
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