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Title: A universal bound on excitations of heavy fields during inflation

Abstract

We discuss a universal bound on any excitation of heavy fields during inflation: the ratio of the heavy field's energy density to the one driving inflation must be less than the maximally allowed relative amplitude of oscillations in the power-spectrum ρ{sub h}/ρ{sub I} ∼< 0.01  according to PLANCK). This bound can be traced back to the sudden change of the equation of state parameter across the excitation event. We employ a sudden transition approximation at the perturbed level, which has been used before in different settings; we check its validity by comparison to the full multi-field result in a concrete case study involving a sudden mass change of an inflaton.

Authors:
;  [1]
  1. Institute for Astrophysics, University of Goettingen, Friedrich Hund Platz 1, D-37077 Goettingen (Germany)
Publication Date:
OSTI Identifier:
22375875
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 09; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AMPLITUDES; APPROXIMATIONS; CONCRETES; COSMOLOGICAL INFLATION; ENERGY DENSITY; EQUATIONS OF STATE; EXCITATION; MASS; OSCILLATIONS; SPECTRA

Citation Formats

Battefeld, Thorsten, and Freitas, R.C., E-mail: tbattefe@gmail.com, E-mail: rodolfo.camargo@pq.cnpq.br. A universal bound on excitations of heavy fields during inflation. United States: N. p., 2014. Web. doi:10.1088/1475-7516/2014/09/029.
Battefeld, Thorsten, & Freitas, R.C., E-mail: tbattefe@gmail.com, E-mail: rodolfo.camargo@pq.cnpq.br. A universal bound on excitations of heavy fields during inflation. United States. doi:10.1088/1475-7516/2014/09/029.
Battefeld, Thorsten, and Freitas, R.C., E-mail: tbattefe@gmail.com, E-mail: rodolfo.camargo@pq.cnpq.br. Mon . "A universal bound on excitations of heavy fields during inflation". United States. doi:10.1088/1475-7516/2014/09/029.
@article{osti_22375875,
title = {A universal bound on excitations of heavy fields during inflation},
author = {Battefeld, Thorsten and Freitas, R.C., E-mail: tbattefe@gmail.com, E-mail: rodolfo.camargo@pq.cnpq.br},
abstractNote = {We discuss a universal bound on any excitation of heavy fields during inflation: the ratio of the heavy field's energy density to the one driving inflation must be less than the maximally allowed relative amplitude of oscillations in the power-spectrum ρ{sub h}/ρ{sub I} ∼< 0.01  according to PLANCK). This bound can be traced back to the sudden change of the equation of state parameter across the excitation event. We employ a sudden transition approximation at the perturbed level, which has been used before in different settings; we check its validity by comparison to the full multi-field result in a concrete case study involving a sudden mass change of an inflaton.},
doi = {10.1088/1475-7516/2014/09/029},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 09,
volume = 2014,
place = {United States},
year = {Mon Sep 01 00:00:00 EDT 2014},
month = {Mon Sep 01 00:00:00 EDT 2014}
}