Non-Perturbative Properties of Heterotic String Vacua Compactified on ${K3\times T^2}$

TL;DR

This paper explores non-perturbative properties of heterotic string vacua compactified on K3×T^2, utilizing dualities to compute couplings and analyze their implications in four-dimensional theories.

Contribution

It provides explicit calculations of vector multiplet couplings in type II vacua and examines their dual heterotic descriptions, revealing new insights into non-perturbative effects.

Findings

Computed vector multiplet couplings in type II vacua.

Analyzed heterotic S-duality and tensor multiplet Coulomb branch.

Linked non-perturbative couplings to heterotic duals.

Abstract

Using the heterotic--type II duality of $N=2$ string vacua in four space-time dimensions we study non-perturbative couplings of toroidally compactified six-dimensional heterotic vacua. In particular, the heterotic--heterotic $S$-duality and the Coulomb branch of tensor multiplets observed in six dimensions are studied from a four-dimensional point of view. We explicitly compute the couplings of the vector multiplets of several type II vacua and investigate the implications for their heterotic duals.