Non-thermal Gravitino Production in Tribrid Inflation

Antusch, Stefan and Dutta, Koushik. (2015) Non-thermal Gravitino Production in Tribrid Inflation. Physical Review D, 92. 083503.

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Official URL: http://edoc.unibas.ch/39796/

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We investigate non-thermal gravitino production after tribrid inflation in supergravity, which is a variant of supersymmetric hybrid inflation where three fields are involved in the inflationary model and where the inflaton field resides in the matter sector of the theory. In contrast to conventional supersymmetric hybrid inflation, where non-thermal gravitino production imposes severe constraints on the inflationary model, we find that the "non-thermal gravitino problem" is generically absent in models of tribrid inflation, mainly due to two effects: (i) With the inflaton in tribrid inflation (after inflation) being lighter than the waterfall field, the latter has a second decay channel with a much larger rate than for the decay into gravitinos. This reduces the branching ratio for the decay of the waterfall field into gravitinos. (ii) The inflaton generically decays later than the waterfall field, and does not produce gravitinos when it decays. This leads to a dilution of the gravitino population from the decays of the waterfall field. The combination of both effects generically leads to a strongly reduced gravitino production in tribrid inflation.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretische Physik (Antusch)
UniBasel Contributors:Antusch, Stefan
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
ISSN:2470-0029 (online) ; 2470-0010 (print)
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:30 Jun 2016 11:00
Deposited On:28 Apr 2016 10:37

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