Hubble induced mass after inflation in spectator field models

Tomohiro Fujita, Keisuke Harigaya

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


Spectator field models such as the curvaton scenario and the modulated reheating are attractive scenarios for the generation of the cosmic curvature perturbation, as the constraints on inflation models are relaxed. In this paper, we discuss the effect of Hubble induced masses on the dynamics of spectator fields after inflation. We pay particular attention to the Hubble induced mass by the kinetic energy of an oscillating inflaton, which is generically unsuppressed but often overlooked. In the curvaton scenario, the Hubble induced mass relaxes the constraint on the property of the inflaton and the curvaton, such as the reheating temperature and the inflation scale. We comment on the implication of our discussion for baryogenesis in the curvaton scenario. In the modulated reheating, the predictions of models e.g. the non-gaussianity can be considerably altered. Furthermore, we propose a new model of the modulated reheating utilizing the Hubble induced mass which realizes a wide range of the local non-gaussianity parameter.

Original languageEnglish
Article number014
JournalJournal of Cosmology and Astroparticle Physics
Issue number12
Publication statusPublished - 2016 Dec 7
Externally publishedYes


  • ination
  • non-gaussianity
  • particle physics-cosmology connection

ASJC Scopus subject areas

  • Astronomy and Astrophysics


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