Abstract
The magnitude of B-mode polarization in the cosmic microwave background as measured by BICEP2 favours models of chaotic inflation with a quadratic m2 ϕ2/2 potential, whereas data from the Planck satellite favour a small value of the tensor-to-scalar perturbation ratio r that is highly consistent with the Starobinsky R +R2 model. Reality may lie somewhere between these two scenarios. In this paper we propose a minimal two-field no-scale supergravity model that interpolates between quadratic and Starobinsky-like inflation as limiting cases, while retaining the successful prediction ns ≃ 0.96.
Highlights
A No-Scale Inflationary Model to Fit Them AllOliveb aTheoretical Particle Physics and Cosmology Group, Department of Physics, King’s College London, London WC2R 2LS, United Kingdom; Theory Division, CERN, CH-1211 Geneva 23, Switzerland bWilliam I
The theory of inflationary cosmology has received important boosts from the first release of data from the Planck satellite [1] - which confirmed the infrared tilt of the scalar perturbation spectrum ns [2] expected in slow-roll models of inflation [3] - and the discovery by BICEP2 of B-mode polarization fluctuations [4] - which may be interpreted as primordial tensor perturbations with a large ratio r relative to the scalar perturbations, as would be generated in models with a large energy density during inflation
In this paper we introduce a minimal two-field no-scale supergravity model with a Kahler potential motivated by orbifold compactifications of string theory [46, 47]
Summary
Oliveb aTheoretical Particle Physics and Cosmology Group, Department of Physics, King’s College London, London WC2R 2LS, United Kingdom; Theory Division, CERN, CH-1211 Geneva 23, Switzerland bWilliam I. Fine Theoretical Physics Institute, School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455, USA cGeorge P. and Cynthia W. Mitchell Institute for Fundamental Physics and Astronomy, Texas A&M University, College Station, TX 77843, USA; Astroparticle Physics Group, Houston Advanced Research Center (HARC), Mitchell Campus, Woodlands, TX 77381, USA; Academy of Athens, Division of Natural Sciences, Athens 10679, Greece
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