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Title: Reheating for closed string inflation

Abstract

We point out some of the outstanding challenges for embedding inflationary cosmology within string theory studying the process of reheating for models where the inflaton is a closed string mode parameterising the size of an internal cycle of the compactification manifold. A realistic model of inflation must explain the tiny perturbations in the cosmic microwave background radiation and also how to excite the ordinary matter degrees of freedom after inflation, required for the success of Big Bang Nucleosynthesis. We study these issues focusing on two promising inflationary models embedded in LARGE volume type IIB flux compactifications. We show that phenomenological requirements and consistency of the effective field theory treatment imply the presence at low energies of a hidden sector together with a visible sector, where the Minimal Supersymmetric Standard Model fields are residing. A detailed calculation of the inflaton coupling to the fields of the hidden sector, visible sector, and moduli sector, reveals that the inflaton fails to excite primarily the visible sector fields, instead hidden sector fields are excited copiously after the end of inflation. This sets severe constraints on hidden sector model building where the most promising scenario emerges as a pure N = 1 SYM theory, forbiddingmore » the kinematical decay of the inflaton to the hidden sector. In this case it is possible to reheat the Universe with the visible degrees of freedom even though in some cases we discover a new tension between TeV scale SUSY and reheating on top of the well-known tension between TeV scale SUSY and inflation.« less

Authors:
 [1];  [2]
  1. Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22603 Hamburg (Germany)
  2. Physics Department, Lancaster University, Lancaster, LA1 4YB (United Kingdom)
Publication Date:
OSTI Identifier:
22275451
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2010; Journal Issue: 09; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COMPACTIFICATION; COSMOLOGY; DEGREES OF FREEDOM; INFLATIONARY UNIVERSE; LIMITING VALUES; NUCLEOSYNTHESIS; RELICT RADIATION; STANDARD MODEL; STRING MODELS; STRING THEORY; SUPERSYMMETRY; TEV RANGE; UNIVERSE; YANG-MILLS THEORY

Citation Formats

Cicoli, Michele, and Mazumdar, Anupam. Reheating for closed string inflation. United States: N. p., 2010. Web. doi:10.1088/1475-7516/2010/09/025.
Cicoli, Michele, & Mazumdar, Anupam. Reheating for closed string inflation. United States. https://doi.org/10.1088/1475-7516/2010/09/025
Cicoli, Michele, and Mazumdar, Anupam. 2010. "Reheating for closed string inflation". United States. https://doi.org/10.1088/1475-7516/2010/09/025.
@article{osti_22275451,
title = {Reheating for closed string inflation},
author = {Cicoli, Michele and Mazumdar, Anupam},
abstractNote = {We point out some of the outstanding challenges for embedding inflationary cosmology within string theory studying the process of reheating for models where the inflaton is a closed string mode parameterising the size of an internal cycle of the compactification manifold. A realistic model of inflation must explain the tiny perturbations in the cosmic microwave background radiation and also how to excite the ordinary matter degrees of freedom after inflation, required for the success of Big Bang Nucleosynthesis. We study these issues focusing on two promising inflationary models embedded in LARGE volume type IIB flux compactifications. We show that phenomenological requirements and consistency of the effective field theory treatment imply the presence at low energies of a hidden sector together with a visible sector, where the Minimal Supersymmetric Standard Model fields are residing. A detailed calculation of the inflaton coupling to the fields of the hidden sector, visible sector, and moduli sector, reveals that the inflaton fails to excite primarily the visible sector fields, instead hidden sector fields are excited copiously after the end of inflation. This sets severe constraints on hidden sector model building where the most promising scenario emerges as a pure N = 1 SYM theory, forbidding the kinematical decay of the inflaton to the hidden sector. In this case it is possible to reheat the Universe with the visible degrees of freedom even though in some cases we discover a new tension between TeV scale SUSY and reheating on top of the well-known tension between TeV scale SUSY and inflation.},
doi = {10.1088/1475-7516/2010/09/025},
url = {https://www.osti.gov/biblio/22275451}, journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 09,
volume = 2010,
place = {United States},
year = {Wed Sep 01 00:00:00 EDT 2010},
month = {Wed Sep 01 00:00:00 EDT 2010}
}