Supersymmetric Hybrid Inflation

TL;DR

Supersymmetric hybrid inflation is a natural, well-protected inflationary model compatible with grand unified theories, solving key cosmological issues like monopole production, baryogenesis, and neutrino masses.

Contribution

The paper constructs a concrete supersymmetric GUT model for hybrid inflation that addresses the mu problem, neutrino masses, reheating, and monopole avoidance.

Findings

Reheating temperature satisfies gravitino constraints.

Baryon asymmetry generated via leptogenesis consistent with neutrino oscillations.

Extensions avoid monopole overproduction in higher gauge groups.

Abstract

The non-supersymmetric and supersymmetric versions of hybrid inflation are summarized. It is emphasized that supersymmetric hybrid inflation (with its extensions) is an extremely "natural" inflationary scenario since it does not require "tiny" parameters, its superpotential has the most general form allowed by the symmetries, and it can be protected against radiative or supergravity corrections. A concrete supersymmetric grand unified theory which leads to hybrid inflation, solves the mu problem and generates seesaw masses for the light neutrinos is constructed. The "reheating" which follows hybrid inflation is studied in this theory. It is shown that the gravitino constraint on the "reheat" temperature can be "naturally" satisfied. Also, the observed baryon asymmetry of the universe can be generated via a primordial leptogenesis consistently with the requirements from solar and atmospheric neutrino oscillations. Extensions of the standard supersymmetric hybrid inflationary scenario which are still consistent with all these requirements but can also avoid the cosmological disaster from the possible copious monopole production at the abrupt termination of standard hybrid inflation are constructed. They rely on utilizing the leading non-renormalizable correction to the standard hybrid inflationary superpotential and are necessary for higher unified gauge groups which predict the existence of monopoles.