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Title: Inflaton dark matter from incomplete decay
Author: Bastero-Gil, Mar
Cerezo, Rafael
Rosa, João G.
Issue Date: 15-May-2016
Publisher: American Physical Society
Abstract: We show that the decay of the inflaton field may be incomplete, while nevertheless successfully reheating the Universe and leaving a stable remnant that accounts for the present dark matter abundance. We note, in particular, that since the mass of the inflaton decay products is field dependent, one can construct models, endowed with an appropriate discrete symmetry, where inflaton decay is kinematically forbidden at late times and only occurs during the initial stages of field oscillations after inflation. We show that this is sufficient to ensure the transition to a radiation-dominated era and that inflaton particles typically thermalize in the process. They eventually decouple and freeze out, yielding a thermal dark matter relic. We discuss possible implementations of this generic mechanism within consistent cosmological and particle physics scenarios, for both single-field and hybrid inflation.
Peer review: yes
DOI: 10.1103/PhysRevD.93.103531
ISSN: 1550-7998
Appears in Collections:CIDMA - Artigos
GGDG - Artigos

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