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Title: GUT-scale inflation with sizeable tensor modes

Abstract

A sizeable tensor-to-scalar ratio, such as recently claimed by BICEP2, would imply a scale of inflation at the typical scale of supersymmetric grand unification. This could be an accident, or strong support for supersymmetric theories. Models of F-term hybrid inflation naturally connect the GUT scale with the inflationary scale, but they also predict the tensor-to-scalar ratio to be unmeasurably small. In this work we analyze a general UV embedding of F-term hybrid inflation into a supergravity theory with a general Kähler potential. The CMB observables are generated during the early phase of inflation, at large inflaton values, where the potential is dominated by Planck-suppressed operators. Tuning the leading higher-order terms can give an inflaton potential with sizeable tensor fluctuations and a field excursion which is still sub-Planckian but close to the Planck scale, as expected from the Lyth bound.

Authors:
;  [1];  [2]
  1. SISSA/INFN, Via Bonomea 265, 34136 Trieste (Italy)
  2. Department of Physics and Astronomy, University of Sussex, Brighton BN1 9QH (United Kingdom)
Publication Date:
OSTI Identifier:
22373364
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 08; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COSMOLOGICAL INFLATION; FLUCTUATIONS; GRAND UNIFIED THEORY; POTENTIALS; SUPERGRAVITY; SUPERSYMMETRY; TENSORS

Citation Formats

Brümmer, Felix, Domcke, Valerie, and Sanz, Verónica, E-mail: fbruemmer@sissa.it, E-mail: vdomcke@sissa.it, E-mail: v.sanz@sussex.ac.uk. GUT-scale inflation with sizeable tensor modes. United States: N. p., 2014. Web. doi:10.1088/1475-7516/2014/08/066.
Brümmer, Felix, Domcke, Valerie, & Sanz, Verónica, E-mail: fbruemmer@sissa.it, E-mail: vdomcke@sissa.it, E-mail: v.sanz@sussex.ac.uk. GUT-scale inflation with sizeable tensor modes. United States. doi:10.1088/1475-7516/2014/08/066.
Brümmer, Felix, Domcke, Valerie, and Sanz, Verónica, E-mail: fbruemmer@sissa.it, E-mail: vdomcke@sissa.it, E-mail: v.sanz@sussex.ac.uk. Fri . "GUT-scale inflation with sizeable tensor modes". United States. doi:10.1088/1475-7516/2014/08/066.
@article{osti_22373364,
title = {GUT-scale inflation with sizeable tensor modes},
author = {Brümmer, Felix and Domcke, Valerie and Sanz, Verónica, E-mail: fbruemmer@sissa.it, E-mail: vdomcke@sissa.it, E-mail: v.sanz@sussex.ac.uk},
abstractNote = {A sizeable tensor-to-scalar ratio, such as recently claimed by BICEP2, would imply a scale of inflation at the typical scale of supersymmetric grand unification. This could be an accident, or strong support for supersymmetric theories. Models of F-term hybrid inflation naturally connect the GUT scale with the inflationary scale, but they also predict the tensor-to-scalar ratio to be unmeasurably small. In this work we analyze a general UV embedding of F-term hybrid inflation into a supergravity theory with a general Kähler potential. The CMB observables are generated during the early phase of inflation, at large inflaton values, where the potential is dominated by Planck-suppressed operators. Tuning the leading higher-order terms can give an inflaton potential with sizeable tensor fluctuations and a field excursion which is still sub-Planckian but close to the Planck scale, as expected from the Lyth bound.},
doi = {10.1088/1475-7516/2014/08/066},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 08,
volume = 2014,
place = {United States},
year = {Fri Aug 01 00:00:00 EDT 2014},
month = {Fri Aug 01 00:00:00 EDT 2014}
}