Quantum Corrections to the Universal Hypermultiplet and Superspace

TL;DR

This paper studies quantum corrections to the universal hypermultiplet in superspace, rederives known one-loop effects, and proposes a framework for nonperturbative instanton-induced moduli space metrics.

Contribution

It introduces a superspace action framework for quantum corrections and proposes a natural model for nonperturbative effects from five-brane instantons.

Findings

Rederived the one-loop correction to the hypermultiplet moduli space.

Developed a superspace action description for quantum corrections.

Proposed a model for nonperturbative instanton effects.

Abstract

We investigate quantum corrections to the effective action of the universal hypermultiplet in the language of projective superspace. We rederive the recently found one-loop correction to the universal hypermultiplet moduli space geometry. The deformed metric is described as a superspace action in terms of a single function, homogeneous of first degree. Our framework leads us to a natural proposal for the nonperturbative moduli space metric induced by five-brane instantons.