Please use this identifier to cite or link to this item: http://hdl.handle.net/10773/16634
Title: Warm little inflaton
Author: Bastero-Gil, Mar
Berera, Arjun
Ramos, Rudnei O.
Rosa, João G.
Keywords: Inflation
Dissipation
Little Higgs
Issue Date: 4-Oct-2016
Publisher: American Physical Society
Abstract: We show that inflation can naturally occur at a finite temperature T>H that is sustained by dissipative effects, when the inflaton field corresponds to a pseudo Nambu-Goldstone boson of a broken gauge symmetry. Similar to the Little Higgs scenarios for electroweak symmetry breaking, the flatness of the inflaton potential is protected against both quadratic divergences and the leading thermal corrections. We show that, nevertheless, nonlocal dissipative effects are naturally present and are able to sustain a nearly thermal bath of light particles despite the accelerated expansion of the Universe. As an example, we discuss the dynamics of chaotic warm inflation with a quartic potential and show that the associated observational predictions are in very good agreement with the latest Planck results. This model constitutes the first realization of warm inflation requiring only a small number of fields; in particular, the inflaton is directly coupled to just two light fields.
Peer review: yes
URI: http://hdl.handle.net/10773/16634
DOI: 10.1103/PhysRevLett.117.151301
ISSN: 0031-9007
Appears in Collections:CIDMA - Artigos
GGDG - Artigos

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