Phenomenological aspects of noscale inflation models
Abstract
We discuss phenomenological aspects of inflationary models wiith a noscale supergravity Kähler potential motivated by compactified string models, in which the inflaton may be identified either as a Kähler modulus or an untwisted matter field, focusing on models that make predictions for the scalar spectral index n_{s} and the tensortoscalar ratio r that are similar to the Starobinsky model. We discuss possible patterns of soft supersymmetry breaking, exhibiting examples of the pure noscale type m_{0} = B_{0} = A_{0} = 0, of the CMSSM type with universal A_{0} and m_{0} ≠ 0 at a high scale, and of the mSUGRA type with A_{0} = B_{0} + m_{0} boundary conditions at the high input scale. These may be combined with a nontrivial gauge kinetic function that generates gaugino masses m_{1/2} ≠ 0, or one may have a pure gravity mediation scenario where trilinear terms and gaugino masses are generated through anomalies. We also discuss inflaton decays and reheating, showing possible decay channels for the inflaton when it is either an untwisted matter field or a Kähler modulus. Reheating is very efficient if a matter field inflaton is directly coupled to MSSM fields, and both candidates lead to sufficient reheating in the presence of a nontrivial gauge kinetic function.
 Publication:

Journal of Cosmology and Astroparticle Physics
 Pub Date:
 October 2015
 DOI:
 10.1088/14757516/2015/10/003
 arXiv:
 arXiv:1503.08867
 Bibcode:
 2015JCAP...10..003E
 Keywords:

 High Energy Physics  Phenomenology;
 Astrophysics  Cosmology and Nongalactic Astrophysics;
 General Relativity and Quantum Cosmology;
 High Energy Physics  Theory
 EPrint:
 41 pages, 6 figures