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  • Letter
  • Open Access

Gravitino constraints on supergravity inflation

Shinsuke Kawai1 and Nobuchika Okada2

  • 1Department of Physics, Sungkyunkwan University, Suwon 16419, Republic of Korea
  • 2Department of Physics and Astronomy, University of Alabama, Tuscaloosa, Alabama 35487, USA

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Phys. Rev. D 105, L101302 – Published 17 May, 2022

DOI: https://doi.org/10.1103/PhysRevD.105.L101302

Abstract

Supergravity embedding of the Standard Model of particle physics provides phenomenologically well-motivated and observationally viable inflationary scenarios. We investigate a class of inflationary models based on the superconformal framework of supergravity and discuss constraints from the reheating temperature, with the particular focus on the gravitino problem inherent in these scenarios. We point out that a large part of the parameter space within the latest BICEP/Keck 95% confidence contour may have been excluded by the gravitino constraints, depending on the mass scale of the inflaton. Precision measurements of the scalar spectral index by a future mission may rule out some of these scenarios conclusively.

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Phys. Rev. D 105, L101302– Published 17 May, 2022
  • Received 18 November 2021
  • Accepted 3 May 2022
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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