Ellis, John García, Marcos A. G. Nagata, Natsumi Nanopoulos, Dimitri V. Olive, Keith A. Verner, Sarunas 2020 <jats:p> 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]. </jats:p> application/pdf https://sonar.ch/global/documents/86998 eng info:eu-repo/semantics/altIdentifier/doi/10.1142/s0218271820300116 info:eu-repo/semantics/altIdentifier/issn/0218-2718 info:eu-repo/semantics/openAccess International Journal of Modern Physics D. - World Scientific Pub Co Pte Lt. - 2020, p. 2030011 Space and Planetary Science Mathematical Physics Astronomy and Astrophysics Building models of inflation in no-scale supergravity http://purl.org/coar/resource_type/c_6501