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Calculations of inflaton decays and reheating: With applications to no-scale inflation models

Research output: Contribution to journalArticle

John Ellis, Marcos A G Garcia, Dimitri V. Nanopoulos, Keith A. Olive

Original languageEnglish
Article number050
Number of pages32
JournalJournal Of Cosmology And Astroparticle Physics
Issue number7
Publication statusPublished - 30 Jul 2015


King's Authors


We discuss inflaton decays and reheating in no-scale Starobinsky-like models of inflation, calculating the effective equation-of-state parameter, w, during the epoch of inflaton decay, the reheating temperature, Treh, and the number of inflationary e-folds, N, comparing analytical approximations with numerical calculations. We then illustrate these results with applications to models based on no-scale supergravity and motivated by generic string compactifications, including scenarios where the inflaton is identified as an untwisted-sector matter field with direct Yukawa couplings to MSSM fields, and where the inflaton decays via gravitational-strength interactions. Finally, we use our results to discuss the constraints on these models imposed by present measurements of the scalar spectral index ns and the tensor-to-scalar perturbation ratio r, converting them into constraints on N, the inflaton decay rate and other parameters of specific no-scale inflationary models.

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