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Title: An ignoble approach to large field inflation

Abstract

We study an inflationary model developed by Kaloper and Sorbo, in which the inflaton is an axion with a sub-Planckian decay constant, whose potential is generated by mixing with a topological 4-form field strength. This gives a 4d construction of ''axion monodromy inflation{sup :} the axion winds many times over the course of inflation and draws energy from the 4-form. The classical theory is equivalent to chaotic inflation with a quadratic inflaton potential. Such models can produce ''high scale'' inflation driven by energy densities of the order of (10{sup 16}GeV){sup 4}, which produces primordial gravitational waves potentially accessible to CMB polarization experiments. We analyze the possible corrections to this scenario from the standpoint of 4d effective field theory, identifying the physics which potentially suppresses dangerous corrections to the slow-roll potential. This yields a constraint relation between the axion decay constant, the inflaton mass, and the 4-form charge. We show how these models can evade the fundamental constraints which typically make high-scale inflation difficult to realize. Specifically, the moduli coupling to the axion-four-form sector must have masses higher than the inflationary Hubble scale (∼<10{sup 14}GeV). There are also constraints from states that become light due to multiple windings of the axion,more » as happens in explicit string theory constructions of this scenario. Further, such models generally have a quantum-mechanical ''tunneling mode'' in which the axion jumps between windings, which must be suppressed. Finally, we outline possible observational signatures.« less

Authors:
 [1];  [2];  [3]
  1. Department of Physics, University of California, Davis, CA 95616 (United States)
  2. Theory Group, Martin Fisher School of Physics, Brandeis University, MS057, PO Box 549110, Waltham, MA 02454 (United States)
  3. Department of Physics, University of Massachusetts, Amherst, MA 01003 (United States)
Publication Date:
OSTI Identifier:
22275497
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2011; Journal Issue: 03; 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; AXIONS; CORRECTIONS; COSMOLOGY; COUPLING; ENERGY DENSITY; FIELD THEORIES; GRAVITATIONAL WAVES; INFLATIONARY UNIVERSE; INFLATONS; POLARIZATION; POTENTIALS; QUANTUM MECHANICS; RELICT RADIATION; STRING MODELS; STRING THEORY; TOPOLOGY; TUNNEL EFFECT

Citation Formats

Kaloper, Nemanja, Lawrence, Albion, and Sorbo, Lorenzo. An ignoble approach to large field inflation. United States: N. p., 2011. Web. doi:10.1088/1475-7516/2011/03/023.
Kaloper, Nemanja, Lawrence, Albion, & Sorbo, Lorenzo. An ignoble approach to large field inflation. United States. doi:10.1088/1475-7516/2011/03/023.
Kaloper, Nemanja, Lawrence, Albion, and Sorbo, Lorenzo. Tue . "An ignoble approach to large field inflation". United States. doi:10.1088/1475-7516/2011/03/023.
@article{osti_22275497,
title = {An ignoble approach to large field inflation},
author = {Kaloper, Nemanja and Lawrence, Albion and Sorbo, Lorenzo},
abstractNote = {We study an inflationary model developed by Kaloper and Sorbo, in which the inflaton is an axion with a sub-Planckian decay constant, whose potential is generated by mixing with a topological 4-form field strength. This gives a 4d construction of ''axion monodromy inflation{sup :} the axion winds many times over the course of inflation and draws energy from the 4-form. The classical theory is equivalent to chaotic inflation with a quadratic inflaton potential. Such models can produce ''high scale'' inflation driven by energy densities of the order of (10{sup 16}GeV){sup 4}, which produces primordial gravitational waves potentially accessible to CMB polarization experiments. We analyze the possible corrections to this scenario from the standpoint of 4d effective field theory, identifying the physics which potentially suppresses dangerous corrections to the slow-roll potential. This yields a constraint relation between the axion decay constant, the inflaton mass, and the 4-form charge. We show how these models can evade the fundamental constraints which typically make high-scale inflation difficult to realize. Specifically, the moduli coupling to the axion-four-form sector must have masses higher than the inflationary Hubble scale (∼<10{sup 14}GeV). There are also constraints from states that become light due to multiple windings of the axion, as happens in explicit string theory constructions of this scenario. Further, such models generally have a quantum-mechanical ''tunneling mode'' in which the axion jumps between windings, which must be suppressed. Finally, we outline possible observational signatures.},
doi = {10.1088/1475-7516/2011/03/023},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 03,
volume = 2011,
place = {United States},
year = {2011},
month = {3}
}