On the Slow Roll Expansion for Brane Inflation

Details On the Slow Roll Expansion for Brane Inflation On the Slow Roll Expansion for Brane Inflation

2007-02-15

arxiv.org/abs/hep-th/0702118v3

JCAP 0704:018,2007

Physics

High Energy Physics

High Energy Physics - Theory

References added

Scientific paper

10.1088/1475-7516/2007/04/018

One possibility for identifying the inflaton in the framework of string theory is that it is a $D$-brane modulus. This option involves a specific, non-canonical form of the kinetic energy -- the Dirac-Born-Infeld action. This note investigates the applicability of the slow roll approximation in inflationary models of this type. To this end the slow roll expansion of Liddle, Parsons and Barrow is derived for the case of the DBI action. The resulting slow roll conditions augment the standard ones valid in the case of canonical kinetic terms. It is also shown that in DBI models inflation does not require that the potential dominate the energy density.

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