Shamit Kachru et al JCAP10(2003)013 doi:10.1088/1475-7516/2003/10/013
Shamit Kachru1,2, Renata Kallosh1, Andrei Linde1, Juan Maldacena3, Liam McAllister1 and Sandip P Trivedi4
Show affiliationsWe investigate the embedding of brane inflation into stable compactifications of string theory. At first sight a warped compactification geometry seems to produce a naturally flat inflaton potential, evading one well known difficulty of brane–antibrane scenarios. Careful consideration of the closed string moduli reveals a further obstacle: superpotential stabilization of the compactification volume typically modifies the inflaton potential and renders it too steep for inflation. We discuss the non-generic conditions under which this problem does not arise. We conclude that brane inflation models can only work if restrictive assumptions about the method of volume stabilization, the warping of the internal space, and the source of inflationary energy are satisfied. We argue that this may not be a real problem, given the large range of available fluxes and background geometries in string theory.
E-print Number: hep-th/0308055
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11.25.Mj Compactification and four-dimensional models
Issue 10 (October 2003)
Received 23 September 2003, accepted for publication 30 September 2003
Published 30 October 2003
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