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Non-standard primordial fluctuations and nongaussianity in string inflation

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 explic...

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Bibliographic Details
Main Authors: Burgess, C. P. (Author) , Cicoli, M. (Author) , Gómez-Reino, M. (Author) , Quevedo, F. (Author) , Tasinato, Gianmassimo (Author) , Zavala, I. (Author)
Format: Article (Journal)
Language:English
Published: August 10, 2010
In: Journal of high energy physics
Year: 2010, Issue: 8, Pages: 1-32
ISSN:1029-8479
DOI:10.1007/JHEP08(2010)045
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1007/JHEP08(2010)045
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Author Notes:C.P. Burgess, M. Cicoli, M. Gómez-Reino, F. Quevedo, G. Tasinato and I. Zavala
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Summary: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 Kähler 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, $$ {f_{\text{NL}}} \simeq \mathcal{O}\left( {10} \right) $$, potentially observable by the Planck satellite, with a bi-spectrum maximized by triangles with squeezed shape in a string realization 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.
Item Description:Gesehen am 16.03.2023
Physical Description:Online Resource
ISSN:1029-8479
DOI:10.1007/JHEP08(2010)045

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