Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2003-08-07
JCAP 0310:013,2003
Physics
High Energy Physics
High Energy Physics - Theory
41 pages, harvmac; v2: results of appendix A extended to include branes at angles, typos corrected, refs added
Scientific paper
10.1088/1475-7516/2003/10/013
We 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.
Kachru Shamit
Kallosh Renata
Linde Andrei
Maldacena Juan
McAllister Liam
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