Effect of reheating on predictions following multiple-field inflation

Selim C. Hotinli, Jonathan Frazer, Andrew H. Jaffe, Joel Meyers, Layne C. Price, and Ewan R. M. Tarrant
Phys. Rev. D 97, 023511 – Published 16 January 2018

Abstract

We study the sensitivity of cosmological observables to the reheating phase following inflation driven by many scalar fields. We describe a method which allows semianalytic treatment of the impact of perturbative reheating on cosmological perturbations using the sudden decay approximation. Focusing on N-quadratic inflation, we show how the scalar spectral index and tensor-to-scalar ratio are affected by the rates at which the scalar fields decay into radiation. We find that for certain choices of decay rates, reheating following multiple-field inflation can have a significant impact on the prediction of cosmological observables.

  • Figure
  • Figure
  • Figure
  • Figure
  • Received 16 November 2017

DOI:https://doi.org/10.1103/PhysRevD.97.023511

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Gravitation, Cosmology & Astrophysics

Authors & Affiliations

Selim C. Hotinli1,*, Jonathan Frazer2,†, Andrew H. Jaffe1,‡, Joel Meyers3,§, Layne C. Price4,∥, and Ewan R. M. Tarrant5,¶

  • 1Astrophysics Group & Imperial Centre for Inference and Cosmology, Department of Physics, Imperial College London, Blackett Laboratory, Prince Consort Road, London SW7 2AZ, United Kingdom
  • 2Deutsches Elektronen-Synchrotron DESY, Theory Group, 22603 Hamburg, Germany
  • 3Canadian Institute for Theoretical Astrophysics, University of Toronto, Toronto, Ontario M5S 3H8, Canada
  • 4McWilliams Center for Cosmology, Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
  • 5Astronomy Centre, University of Sussex, Falmer, Brighton BN1 9QH, United Kingdom

  • *selim.hotinli14@imperial.ac.uk
  • jonathan.frazer@desy.de
  • a.jaffe@imperial.ac.uk
  • §jmeyers@cita.utoronto.ca
  • laynep@andrew.cmu.edu
  • e.tarrant@sussex.ac.uk

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 97, Iss. 2 — 15 January 2018

Reuse & Permissions
Access Options
CHORUS

Article Available via CHORUS

Download Accepted Manuscript
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review D

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×