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Title: Inflation by alignment

Abstract

Pseudo-Goldstone bosons (pGBs) can provide technically natural inflatons, as has been comparatively well-explored in the simplest axion examples. Although inflationary success requires trans-Planckian decay constants, f≳M{sub p}, several mechanisms have been proposed to obtain this, relying on (mis-)alignments between potential and kinetic energies in multiple-field models. We extend these mechanisms to a broader class of inflationary models, including in particular the exponential potentials that arise for pGB potentials based on noncompact groups (and so which might apply to moduli in an extra-dimensional setting). The resulting potentials provide natural large-field inflationary models and can predict a larger primordial tensor signal than is true for simpler single-field versions of these models. In so doing we provide a unified treatment of several alignment mechanisms, showing how each emerges as a limit of the more general setup.

Authors:
 [1];  [2];  [2];  [3]
  1. PH -TH Division, CERN,CH-1211, Genève 23 (Switzerland)
  2. (Canada)
  3. Van Swinderen Institute for Particle Physics and Gravity, University of Groningen,Nijenborgh 4, 9747 AG Groningen (Netherlands)
Publication Date:
Sponsoring Org.:
SCOAP3, CERN, Geneva (Switzerland)
OSTI Identifier:
22458350
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2015; Journal Issue: 06; Other Information: PUBLISHER-ID: JCAP06(2015)012; OAI: oai:repo.scoap3.org:10613; Article funded by SCOAP3. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 License. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ALIGNMENT; COSMOLOGICAL INFLATION; GOLDSTONE BOSONS; INFLATONS; KINETIC ENERGY; SIGNALS; STRING MODELS; STRING THEORY

Citation Formats

Burgess, C.P., Department of Physics & Astronomy, McMaster University,1280 Main Street West, Hamilton ON, Perimeter Institute for Theoretical Physics,31 Caroline Street North, Waterloo ON, and Roest, Diederik. Inflation by alignment. United States: N. p., 2015. Web. doi:10.1088/1475-7516/2015/06/012.
Burgess, C.P., Department of Physics & Astronomy, McMaster University,1280 Main Street West, Hamilton ON, Perimeter Institute for Theoretical Physics,31 Caroline Street North, Waterloo ON, & Roest, Diederik. Inflation by alignment. United States. doi:10.1088/1475-7516/2015/06/012.
Burgess, C.P., Department of Physics & Astronomy, McMaster University,1280 Main Street West, Hamilton ON, Perimeter Institute for Theoretical Physics,31 Caroline Street North, Waterloo ON, and Roest, Diederik. Mon . "Inflation by alignment". United States. doi:10.1088/1475-7516/2015/06/012.
@article{osti_22458350,
title = {Inflation by alignment},
author = {Burgess, C.P. and Department of Physics & Astronomy, McMaster University,1280 Main Street West, Hamilton ON and Perimeter Institute for Theoretical Physics,31 Caroline Street North, Waterloo ON and Roest, Diederik},
abstractNote = {Pseudo-Goldstone bosons (pGBs) can provide technically natural inflatons, as has been comparatively well-explored in the simplest axion examples. Although inflationary success requires trans-Planckian decay constants, f≳M{sub p}, several mechanisms have been proposed to obtain this, relying on (mis-)alignments between potential and kinetic energies in multiple-field models. We extend these mechanisms to a broader class of inflationary models, including in particular the exponential potentials that arise for pGB potentials based on noncompact groups (and so which might apply to moduli in an extra-dimensional setting). The resulting potentials provide natural large-field inflationary models and can predict a larger primordial tensor signal than is true for simpler single-field versions of these models. In so doing we provide a unified treatment of several alignment mechanisms, showing how each emerges as a limit of the more general setup.},
doi = {10.1088/1475-7516/2015/06/012},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 06,
volume = 2015,
place = {United States},
year = {Mon Jun 08 00:00:00 EDT 2015},
month = {Mon Jun 08 00:00:00 EDT 2015}
}