SubPlanckian twofield inflation consistent with the Lyth bound
Abstract
The BICEP2 observation of a large tensortoscalar ratio, r = 0.20{sup +0.07}{sub 0.05}, implies that the inflaton φ in singlefield inflation models must satisfy φ ∼ 10M{sub Pl} in order to produce sufficient inflation. This is a problem if interaction terms suppressed by the Planck scale impose a bound φ ∼< M{sub Pl}. Here we consider whether it is possible to have successful subPlanckian inflation in the case of twofield inflation. The trajectory in field space cannot be radial if the effective singlefield inflaton is to satisfy the Lyth bound. By considering a complex field Φ, we show that a near circular but aperiodic modulation of a Φ{sup 4} potential can reproduce the results of φ{sup 2} chaotic inflation for n{sub s} and r while satisfying Φ ∼< 0.01 M{sub Pl} throughout. More generally, for models based on a Φ{sup 4} potential, the simplest subPlanckian models are equivalent to φ{sup 2} and φ{sup 4/3} chaotic inflation.
 Authors:

 Department of Physics, University of Lancaster, Lancaster LA1 4YB (United Kingdom)
 Publication Date:
 OSTI Identifier:
 22375880
 Resource Type:
 Journal Article
 Journal Name:
 Journal of Cosmology and Astroparticle Physics
 Additional Journal Information:
 Journal Volume: 2014; Journal Issue: 09; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 14757516
 Country of Publication:
 United States
 Language:
 English
 Subject:
 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CHAOS THEORY; COSMOLOGICAL INFLATION; INTERACTIONS; MODULATION; POTENTIALS; SCALARS; SPACE; TENSORS; TRAJECTORIES
Citation Formats
McDonald, John. SubPlanckian twofield inflation consistent with the Lyth bound. United States: N. p., 2014.
Web. doi:10.1088/14757516/2014/09/027.
McDonald, John. SubPlanckian twofield inflation consistent with the Lyth bound. United States. doi:10.1088/14757516/2014/09/027.
McDonald, John. Mon .
"SubPlanckian twofield inflation consistent with the Lyth bound". United States. doi:10.1088/14757516/2014/09/027.
@article{osti_22375880,
title = {SubPlanckian twofield inflation consistent with the Lyth bound},
author = {McDonald, John},
abstractNote = {The BICEP2 observation of a large tensortoscalar ratio, r = 0.20{sup +0.07}{sub 0.05}, implies that the inflaton φ in singlefield inflation models must satisfy φ ∼ 10M{sub Pl} in order to produce sufficient inflation. This is a problem if interaction terms suppressed by the Planck scale impose a bound φ ∼< M{sub Pl}. Here we consider whether it is possible to have successful subPlanckian inflation in the case of twofield inflation. The trajectory in field space cannot be radial if the effective singlefield inflaton is to satisfy the Lyth bound. By considering a complex field Φ, we show that a near circular but aperiodic modulation of a Φ{sup 4} potential can reproduce the results of φ{sup 2} chaotic inflation for n{sub s} and r while satisfying Φ ∼< 0.01 M{sub Pl} throughout. More generally, for models based on a Φ{sup 4} potential, the simplest subPlanckian models are equivalent to φ{sup 2} and φ{sup 4/3} chaotic inflation.},
doi = {10.1088/14757516/2014/09/027},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {14757516},
number = 09,
volume = 2014,
place = {United States},
year = {2014},
month = {9}
}