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Building models of inflation in no-scale supergravity

  • Ellis, John National Institute of Chemical Physics and Biophysics, Rävala 10, 10143 Tallinn, Estonia
  • García, Marcos A. G. Instituto de Física Teórica (IFT) UAM-CSIC, Campus de Cantoblanco 28049, Madrid, Spain
  • Nagata, Natsumi Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113–0033, Japan
  • Nanopoulos, Dimitri V. Academy of Athens, Division of Natural Sciences, Athens 10679, Greece
  • Olive, Keith A. William I. Fine Theoretical Physics Institute, School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455, USA
  • Verner, Sarunas William I. Fine Theoretical Physics Institute, School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455, USA
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  • 2020-10-22
Published in:
  • International Journal of Modern Physics D. - World Scientific Pub Co Pte Lt. - 2020, p. 2030011
Space and Planetary Science
Mathematical Physics
Astronomy and Astrophysics
English After reviewing the motivations for cosmological inflation formulated in the formalism of supersymmetry, we argue that the appropriate framework is that of no-scale supergravity. We then show how to construct within this framework inflationary models whose predictions for the tilt in the spectrum of scalar perturbations, [Formula: see text], and the ratio, [Formula: see text], of tensor and scalar perturbations coincide with those of the [Formula: see text] model of inflation proposed by Starobinsky. A more detailed study of no-scale supergravity reveals a structure that is closely related to that of [Formula: see text] modifications of the minimal Einstein–Hilbert action for general relativity, opening avenues for constructing no-scale de Sitter and anti-de Sitter models by combining pairs of Minkowski models, as well as generalizations of the original no-scale Starobinsky models of inflation. We then discuss the phenomenology of no-scale models of inflation, including inflaton decay and reheating, and then the construction of explicit scenarios based on SU(5), SO(10) and string-motivated flipped SU(5)×U(1) GUT models. The latter provides a possible model of almost everything below the Planck scale, including neutrino masses and oscillations, the cosmological baryon asymmetry and cold dark matter, as well as [Formula: see text] and [Formula: see text].
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  • English
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https://sonar.ch/global/documents/86998
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