Phenomenological Aspects of No-Scale Inflation Models

TL;DR

This paper explores phenomenological features of no-scale supergravity inflation models inspired by string theory, analyzing inflation predictions, supersymmetry breaking patterns, inflaton decay, and reheating processes.

Contribution

It provides a comprehensive analysis of inflationary predictions, supersymmetry breaking scenarios, and reheating mechanisms in no-scale supergravity models derived from string theory.

Findings

Inflation models predict scalar spectral index and tensor-to-scalar ratio similar to Starobinsky.

Various supersymmetry breaking patterns are examined, including pure no-scale and CMSSM types.

Reheating can be efficient with matter field inflaton coupled to MSSM fields.

Abstract

We discuss phenomenological aspects of no-scale supergravity inflationary models motivated by compactified string models, in which the inflaton may be identified either as a K\"ahler modulus or an untwisted matter field, focusing on models that make predictions for the scalar spectral index $n_s$ and the tensor-to-scalar ratio $r$ that are similar to the Starobinsky model. We discuss possible patterns of soft supersymmetry breaking, exhibiting examples of the pure no-scale type $m_0 = B_0 = A_0 = 0$, of the CMSSM type with universal $A_0$ and $m_0 \ne 0$ 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 non-trivial gauge kinetic function that generates gaugino masses $m_{1/2} \ne 0$, 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 K\"ahler 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 non-trivial gauge kinetic function.