Quantum modes in DBI inflation: exact solutions and constraints from
vacuum selection
W. Kinney, and K. Tzirakis. (2007)cite arxiv:0712.2043
Comment: 10 pages, LaTeX; V2: version submitted to PRD. References added,
minor error in text corrected.
Abstract
We study a two-parameter family of exactly solvable inflation models with
variable sound speed, and derive a corresponding exact expression for the
spectrum of curvature perturbations. We generalize this expression to the slow
roll case, and derive an approximate expression for the scalar spectral index
valid to second order in slow roll. We apply the result to the case of DBI
inflation, and show that for certain choices of slow roll parameters, the
Bunch-Davies limit (a) does not exist, or (b) is sensitive to stringy physics
in the bulk, which in principle can have observable signatures in the
primordial power spectrum.
Description
Quantum modes in DBI inflation: exact solutions and constraints from
vacuum selection
%0 Journal Article
%1 Kinney2007
%A Kinney, William H.
%A Tzirakis, Konstantinos
%D 2007
%K DBI cosmology inflation vacuum
%T Quantum modes in DBI inflation: exact solutions and constraints from
vacuum selection
%U http://arxiv.org/abs/0712.2043
%X We study a two-parameter family of exactly solvable inflation models with
variable sound speed, and derive a corresponding exact expression for the
spectrum of curvature perturbations. We generalize this expression to the slow
roll case, and derive an approximate expression for the scalar spectral index
valid to second order in slow roll. We apply the result to the case of DBI
inflation, and show that for certain choices of slow roll parameters, the
Bunch-Davies limit (a) does not exist, or (b) is sensitive to stringy physics
in the bulk, which in principle can have observable signatures in the
primordial power spectrum.
@article{Kinney2007,
abstract = { We study a two-parameter family of exactly solvable inflation models with
variable sound speed, and derive a corresponding exact expression for the
spectrum of curvature perturbations. We generalize this expression to the slow
roll case, and derive an approximate expression for the scalar spectral index
valid to second order in slow roll. We apply the result to the case of DBI
inflation, and show that for certain choices of slow roll parameters, the
Bunch-Davies limit (a) does not exist, or (b) is sensitive to stringy physics
in the bulk, which in principle can have observable signatures in the
primordial power spectrum.
},
added-at = {2009-08-28T12:10:27.000+0200},
author = {Kinney, William H. and Tzirakis, Konstantinos},
biburl = {https://www.bibsonomy.org/bibtex/268bf4067a7bb1741dab8ae723911ef3f/jpschaar},
description = {Quantum modes in DBI inflation: exact solutions and constraints from
vacuum selection},
interhash = {cd6445bd44542708369532ba4613e10e},
intrahash = {68bf4067a7bb1741dab8ae723911ef3f},
keywords = {DBI cosmology inflation vacuum},
note = {cite arxiv:0712.2043
Comment: 10 pages, LaTeX; V2: version submitted to PRD. References added,
minor error in text corrected},
timestamp = {2009-08-28T12:10:27.000+0200},
title = {Quantum modes in DBI inflation: exact solutions and constraints from
vacuum selection},
url = {http://arxiv.org/abs/0712.2043},
year = 2007
}