Warped Wilson Line DBI Inflation

Details Warped Wilson Line DBI Inflation Warped Wilson Line DBI Inflation

2008-10-28

arxiv.org/abs/0810.5001v3

JCAP 0901:045,2009

Physics

High Energy Physics

High Energy Physics - Theory

v3: Typos corrected, Published in JCAP; 21 pages

Scientific paper

10.1088/1475-7516/2009/01/045

We propose a novel inflationary scenario in string theory in which the inflaton field is a 'Wilson line' degree of freedom in the worldvolume of a probe Dp-brane, in a warped flux compactification. Kinetic terms for Wilson line fields on the world volume of a D-brane take a nonstandard Dirac-Born-Infeld (DBI) form. Thus, we work in the framework of DBI inflation. This extends the original slow roll Wilson line inflationary scenario, where only the quadratic piece was considered. Warped DBI Wilson line inflation offers an attractive alternative to ordinary (position field) DBI inflation, inasmuch as observational and theoretical constraints get considerably relaxed. Besides the standard large non-Gaussianities in DBI scenarios, it is also possible to achieve an observable amount of gravitational waves.

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