Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2010-05-26
JHEP 1008:045,2010
Physics
High Energy Physics
High Energy Physics - Theory
31 pages. Typos corrected, references added, matches published version. Dedicated to Lev Kofman
Scientific paper
10.1007/JHEP08(2010)045
Inflationary scenarios in string theory often involve a large number of light scalar fields, whose presence can enrich the post-inflationary evolution of primordial fluctuations generated during the inflationary epoch. We provide a simple example of such post-inflationary processing within an explicit string-inflationary construction, using a Kahler modulus as the inflaton within the framework of LARGE Volume Type-IIB string flux compactifications. We argue that inflationary models within this broad category often have a selection of scalars that are light enough to be cosmologically relevant, whose contributions to the primordial fluctuation spectrum can compete with those generated in the standard way by the inflaton. These models consequently often predict nongaussianity at a level, f_NL ~ O(10), potentially observable by the Planck satellite, with a bi-spectrum maximized by triangles with squeezed shape in a string realisation of the curvaton scenario. We argue that the observation of such a signal would robustly prefer string cosmologies such as these that predict a multi-field dynamics during the very early universe.
Burgess Cliff P.
Cicoli Michele
Gomez-Reino Marta
Quevedo Fernando
Tasinato Gianmassimo
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