Gravitational and Axionic Backgrounds for Four-dimensional Superstrings

TL;DR

This paper constructs new four-dimensional superstring vacua with extended superconformal symmetries, exploring backgrounds with non-trivial dilaton fields and Abelian symmetries, and demonstrating duality preservation.

Contribution

It introduces novel superstring backgrounds with extended symmetries and develops methods to construct dual backgrounds maintaining superconformal invariance.

Findings

Existence of new superstring vacua with extended superconformal symmetry

Construction of dual backgrounds preserving N=2 superconformal invariance

Identification of Abelian killing symmetries in non-trivial dilaton backgrounds

Abstract

We construct new four-dimensional superstring vacua with extended superconformal symmetries. A non-trivial dilaton background implies the existence of Abelian killing symmetries. These are used to construct dual equivalent backgrounds in a way preserving the N=2 superconformal invariance.