A Microscopic Limit on Gravitational Waves from D-brane Inflation
Journal
Phys.Rev.D75:123508,2007
Journal Volume
75
Journal Issue
12
Date Issued
2006-10-27
Author(s)
Liam McAllister
Abstract
We derive a microscopic bound on the maximal field variation of the inflaton
during warped D-brane inflation. By a result of Lyth, this implies an upper
limit on the amount of gravitational waves produced during inflation. We show
that a detection at the level $r > 0.01$ would falsify slow roll D-brane
inflation. In DBI inflation, detectable tensors may be possible in special
compactifications, provided that $r$ decreases rapidly during inflation. We
also show that for the special case of DBI inflation with a quadratic
potential, current observational constraints imply strong upper bounds on the
five-form flux.
Subjects
High Energy Physics - Theory; High Energy Physics - Theory; Astrophysics
SDGs
Description
8 pages
Type
journal article