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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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Autores principales: Burgess, C.P., Cicoli, M., Gomez-Reino, M., Quevedo, F., Tasinato, G., Zavala, I.
Formato: info:eu-repo/semantics/article
Lenguaje:eng
Publicado: JHEP 2010
Materias:
Acceso en línea:https://dx.doi.org/10.1007/JHEP08(2010)045
http://cds.cern.ch/record/1268099
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author Burgess, C.P.
Cicoli, M.
Gomez-Reino, M.
Quevedo, F.
Tasinato, G.
Zavala, I.
author_facet Burgess, C.P.
Cicoli, M.
Gomez-Reino, M.
Quevedo, F.
Tasinato, G.
Zavala, I.
author_sort Burgess, C.P.
collection CERN
description 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.
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spelling cern-12680992023-03-14T19:09:32Z doi:10.1007/JHEP08(2010)045 http://cds.cern.ch/record/1268099 eng Burgess, C.P. Cicoli, M. Gomez-Reino, M. Quevedo, F. Tasinato, G. Zavala, I. Non-standard primordial fluctuations and nongaussianity in string inflation Particle Physics - Theory 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. 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. info:eu-repo/grantAgreement/EC/FP7/237920 info:eu-repo/semantics/openAccess Education Level info:eu-repo/semantics/article http://cds.cern.ch/record/1268099 JHEP JHEP, (2010) pp. 045 2010-05-27
spellingShingle Particle Physics - Theory
Burgess, C.P.
Cicoli, M.
Gomez-Reino, M.
Quevedo, F.
Tasinato, G.
Zavala, I.
Non-standard primordial fluctuations and nongaussianity in string inflation
title Non-standard primordial fluctuations and nongaussianity in string inflation
title_full Non-standard primordial fluctuations and nongaussianity in string inflation
title_fullStr Non-standard primordial fluctuations and nongaussianity in string inflation
title_full_unstemmed Non-standard primordial fluctuations and nongaussianity in string inflation
title_short Non-standard primordial fluctuations and nongaussianity in string inflation
title_sort non-standard primordial fluctuations and nongaussianity in string inflation
topic Particle Physics - Theory
url https://dx.doi.org/10.1007/JHEP08(2010)045
http://cds.cern.ch/record/1268099
http://cds.cern.ch/record/1268099
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