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Title: Warm little inflaton becomes cold dark matter
Author: Rosa, João Pedro Trancoso Gomes
Ventura, Luís Bastos
Keywords: Inflation
Dark matter
Issue Date: 24-Apr-2019
Publisher: American Physical Society
Abstract: We present a model where the inflaton can naturally account for all the dark matter in the Universe within the warm inflation paradigm. In particular, we show that the symmetries of the Warm Little Inflaton scenario (i) avoid large thermal and radiative corrections to the scalar potential, (ii) allow for sufficiently strong dissipative effects to sustain a radiation bath during inflation that becomes dominant at the end of the slow-roll regime, and (iii) enable a stable inflaton remnant in the post-inflationary epochs. The latter behaves as dark radiation until parametrically before matter-radiation equality, leading to a non-negligible contribution to the effective number of relativistic degrees of freedom during nucleosynthesis, becoming the dominant cold dark matter component in the Universe for inflaton masses in the $10^{-4}-10^{-1}$ eV range. Cold dark matter isocurvature perturbations, anti-correlated with the main adiabatic component, provide a smoking gun for this scenario that can be tested in the near future.
Peer review: yes
DOI: 10.1103/PhysRevLett.122.161301
ISSN: 0031-9007
Publisher Version:
Appears in Collections:CIDMA - Artigos
DFis - Artigos
GGDG - Artigos

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