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Title: Chain inflation reconsidered

Abstract

We investigate density perturbations in the chain inflation scenario, where the inflaton undergoes successive tunneling transitions along one field direction. First we show that when the bubble walls associated with such a phase transition meet, they induce the next phase transition and continue to propagate as phase interfaces. Then we present an analytical calculation of the density fluctuations and an estimate of non-Gaussianities such as f{sub NL}, which we find to be small (of order 1). To get the right amplitude for the power spectrum, there have to be 10{sup 8} phase transitions per Hubble time, a significant model building challenge. We find that working models of chain inflation must be rather strongly coupled, and thus have a very limited range of validity as effective field theories. We discuss generalizations to the multiple field case, the curvaton scenario, and noncanonical kinetic terms.

Authors:
; ;  [1]
  1. Physics Department, McGill University, Montreal, H3A2T8 (Canada)
Publication Date:
OSTI Identifier:
22277817
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2011; Journal Issue: 08; 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; AMPLITUDES; COSMOLOGY; DENSITY; DISTURBANCES; ENERGY SPECTRA; FIELD THEORIES; FLUCTUATIONS; INFLATIONARY UNIVERSE; INFLATONS; PHASE TRANSFORMATIONS; TUNNEL EFFECT

Citation Formats

Cline, James M., Moore, Guy D., and Wang, Yi, E-mail: jcline@hep.physics.mcgill.ca, E-mail: guymoore@hep.physics.mcgill.ca, E-mail: wangyi@hep.physics.mcgill.ca. Chain inflation reconsidered. United States: N. p., 2011. Web. doi:10.1088/1475-7516/2011/08/032.
Cline, James M., Moore, Guy D., & Wang, Yi, E-mail: jcline@hep.physics.mcgill.ca, E-mail: guymoore@hep.physics.mcgill.ca, E-mail: wangyi@hep.physics.mcgill.ca. Chain inflation reconsidered. United States. doi:10.1088/1475-7516/2011/08/032.
Cline, James M., Moore, Guy D., and Wang, Yi, E-mail: jcline@hep.physics.mcgill.ca, E-mail: guymoore@hep.physics.mcgill.ca, E-mail: wangyi@hep.physics.mcgill.ca. Mon . "Chain inflation reconsidered". United States. doi:10.1088/1475-7516/2011/08/032.
@article{osti_22277817,
title = {Chain inflation reconsidered},
author = {Cline, James M. and Moore, Guy D. and Wang, Yi, E-mail: jcline@hep.physics.mcgill.ca, E-mail: guymoore@hep.physics.mcgill.ca, E-mail: wangyi@hep.physics.mcgill.ca},
abstractNote = {We investigate density perturbations in the chain inflation scenario, where the inflaton undergoes successive tunneling transitions along one field direction. First we show that when the bubble walls associated with such a phase transition meet, they induce the next phase transition and continue to propagate as phase interfaces. Then we present an analytical calculation of the density fluctuations and an estimate of non-Gaussianities such as f{sub NL}, which we find to be small (of order 1). To get the right amplitude for the power spectrum, there have to be 10{sup 8} phase transitions per Hubble time, a significant model building challenge. We find that working models of chain inflation must be rather strongly coupled, and thus have a very limited range of validity as effective field theories. We discuss generalizations to the multiple field case, the curvaton scenario, and noncanonical kinetic terms.},
doi = {10.1088/1475-7516/2011/08/032},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 08,
volume = 2011,
place = {United States},
year = {2011},
month = {8}
}