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- W2890960374 abstract "We study perturbative reheating at the end of fibre inflation where the inflaton is a closed string modulus with a Starobinsky-like potential. We first derive the spectral index ns and the tensor-to-scalar ratio r as a function of the number of efoldings and the parameter R which controls slow-roll breaking corrections. We then compute the inflaton couplings and decay rates into ultra-light bulk axions and visible sector fields on D7-branes wrapping the inflaton divisor. This leads to a reheating temperature of order 1010 GeV which requires 52 efoldings. Ultra-light axions contribute to dark radiation even if Δ Neff is almost negligible in the generic case where the visible sector D7-stack supports a non-zero gauge flux. If the parameter R is chosen to be small enough, ns≃ 0.965 is then in perfect agreement with current observations while r turns out to be of order r≃ 0.007. If instead the flux on the inflaton divisor is turned off, Δ Neff≲ 0.6 which, when used as a prior for Planck data, requires ns≃ 0.99. After R is fixed to obtain such a value of ns, primordial gravity waves are larger since r≃ 0.01." @default.
- W2890960374 created "2018-09-27" @default.
- W2890960374 creator A5074264308 @default.
- W2890960374 creator A5075070168 @default.
- W2890960374 date "2019-02-22" @default.
- W2890960374 modified "2023-10-04" @default.
- W2890960374 title "Reheating and dark radiation after fibre inflation" @default.
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- W2890960374 doi "https://doi.org/10.1088/1475-7516/2019/02/048" @default.
- W2890960374 hasPublicationYear "2019" @default.
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