Resonant particle production during inflation: A full analytical study

Lauren Pearce, Marco Peloso, Lorenzo Sorbo

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

We revisit the study of the phenomenology associated to a burst of particle production of a field whose mass is controlled by the inflaton field and vanishes at one given instance during inflation. This generates a bump in the correlators of the primordial scalar curvature. We provide a unified formalism to compute various effects that have been obtained in the literature and confirm that the dominant effects are due to the rescattering of the produced particles on the inflaton condensate. We improve over existing results (based on numerical fits) by providing exact analytic expressions for the shape and height of the bump, both in the power spectrum and the equilateral bispectrum. We then study the regime of validity of the perturbative computations of this signature. Finally, we extend these computations to the case of a burst of particle production in a sector coupled only gravitationally to the inflaton.

Original languageEnglish (US)
Article number054
JournalJournal of Cosmology and Astroparticle Physics
Volume2017
Issue number5
DOIs
StatePublished - May 30 2017

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics

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