skip to main content

Title: Resurrecting quadratic inflation in no-scale supergravity in light of BICEP2

The magnitude of primordial tensor perturbations reported by the BICEP2 experiment is consistent with simple models of chaotic inflation driven by a single scalar field with a power-law potential ∝ φ{sup n} : n ≅ 2, in contrast to the WMAP and Planck results, which favored models resembling the Starobinsky R+R{sup 2} model if running of the scalar spectral index could be neglected. While models of inflation with a quadratic potential may be constructed in simple N = 1 supergravity, these constructions are more challenging in no-scale supergravity. We discuss here how quadratic inflation can be accommodated within supergravity, focusing primarily on the no-scale case. We also argue that the quadratic inflaton may be identified with the supersymmetric partner of a singlet (right-handed) neutrino, whose subsequent decay could have generated the baryon asymmetry via leptogenesis.
Authors:
 [1] ; ;  [2] ;  [3]
  1. Theoretical Particle Physics and Cosmology Group, Department of Physics, King's College London, London, WC2R 2LS (United Kingdom)
  2. William I. Fine Theoretical Physics Institute, School of Physics and Astronomy, University of Minnesota, 116 Church Street SE, Minneapolis, MN, 55455 (United States)
  3. George P. and Cynthia W. Mitchell Institute for Fundamental Physics and Astronomy, Texas A and M University, College Station, Texas, 77843 (United States)
Publication Date:
OSTI Identifier:
22373559
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 05; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASYMMETRY; BARYONS; CHAOS THEORY; COSMOLOGICAL INFLATION; NEUTRINOS; PARTICLE PRODUCTION; PERTURBATION THEORY; POTENTIALS; SCALAR FIELDS; SUPERGRAVITY; SUPERSYMMETRY