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Title: Preheating after modular inflation

Abstract

We study (p)reheating in modular (closed string) inflationary scenarios, with a special emphasis on Kähler moduli/Roulette models. It is usually assumed that reheating in such models occurs through perturbative decays. However, we find that there are very strong non-perturbative preheating decay channels related to the particular shape of the inflaton potential (which is highly nonlinear and has a very steep minimum). Preheating after modular inflation, proceeding through a combination of tachyonic instability and broad-band parametric resonance, is perhaps the most violent example of preheating after inflation known in the literature. Further, we consider the subsequent transfer of energy to the standard model sector in scenarios where the standard model particles are confined to a D7-brane wrapping the inflationary blow-up cycle of the compactification manifold or, more interestingly, a non-inflationary blow-up cycle. We explicitly identify the decay channels of the inflaton in these two scenarios. We also consider the case where the inflationary cycle shrinks to the string scale at the end of inflation; here a field theoretical treatment of reheating is insufficient and one must turn instead to a stringy description. We estimate the decay rate of the inflaton and the reheat temperature for various scenarios.

Authors:
; ; ;  [1]
  1. Canadian Institute for Theoretical Astrophysics, University of Toronto, 60 St. George St., Toronto, Ontario M5S 3H8 Canada (Canada)
Publication Date:
OSTI Identifier:
22273130
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2009; Journal Issue: 12; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BRANES; COMPACTIFICATION; COSMOLOGY; INFLATIONARY UNIVERSE; INFLATONS; NONLINEAR PROBLEMS; POTENTIALS; RESONANCE; STANDARD MODEL; STRING MODELS; TACHYONS

Citation Formats

Barnaby, Neil, Bond, J. Richard, Huang, Zhiqi, and Kofman, Lev. Preheating after modular inflation. United States: N. p., 2009. Web. doi:10.1088/1475-7516/2009/12/021.
Barnaby, Neil, Bond, J. Richard, Huang, Zhiqi, & Kofman, Lev. Preheating after modular inflation. United States. https://doi.org/10.1088/1475-7516/2009/12/021
Barnaby, Neil, Bond, J. Richard, Huang, Zhiqi, and Kofman, Lev. 2009. "Preheating after modular inflation". United States. https://doi.org/10.1088/1475-7516/2009/12/021.
@article{osti_22273130,
title = {Preheating after modular inflation},
author = {Barnaby, Neil and Bond, J. Richard and Huang, Zhiqi and Kofman, Lev},
abstractNote = {We study (p)reheating in modular (closed string) inflationary scenarios, with a special emphasis on Kähler moduli/Roulette models. It is usually assumed that reheating in such models occurs through perturbative decays. However, we find that there are very strong non-perturbative preheating decay channels related to the particular shape of the inflaton potential (which is highly nonlinear and has a very steep minimum). Preheating after modular inflation, proceeding through a combination of tachyonic instability and broad-band parametric resonance, is perhaps the most violent example of preheating after inflation known in the literature. Further, we consider the subsequent transfer of energy to the standard model sector in scenarios where the standard model particles are confined to a D7-brane wrapping the inflationary blow-up cycle of the compactification manifold or, more interestingly, a non-inflationary blow-up cycle. We explicitly identify the decay channels of the inflaton in these two scenarios. We also consider the case where the inflationary cycle shrinks to the string scale at the end of inflation; here a field theoretical treatment of reheating is insufficient and one must turn instead to a stringy description. We estimate the decay rate of the inflaton and the reheat temperature for various scenarios.},
doi = {10.1088/1475-7516/2009/12/021},
url = {https://www.osti.gov/biblio/22273130}, journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 12,
volume = 2009,
place = {United States},
year = {2009},
month = {12}
}