Brane inflation is attractive

Journal Article · Tue Jul 15 04:00:00 EDT 2008 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.78.023509· OSTI ID:21250329

Underwood, Bret ^[1]

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1. Department of Physics, University of Wisconsin, Madison, Wisconsin 53706 (United States)

We study the phase space of initial conditions for brane inflation, and find that including the effects of the Dirac-Born-Infeld (DBI) kinetic term dramatically improves previous estimates on the amount of fine-tuning of initial conditions necessary for inflation, even for models dominated by slow roll. Two effects turn out to be important for the phase space analysis: restrictions on the total available phase space due to UV effects in brane inflation, and the extension of the inflationary attractor to the DBI inflationary regime. We compare the amount of initial conditions fine-tuning required for a brane-inflation model and its standard field theory counterpart and find that brane inflation decreases the required tuning by several orders of magnitude.

• OSTI ID: 21250329
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 2 Vol. 78; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ATTRACTORS
BORN-INFELD THEORY
COMPARATIVE EVALUATIONS
FIELD THEORIES
INFLATION
PHASE SPACE