AdS_3 backgrounds from 10D effective action of heterotic string theory

TL;DR

This paper develops a method to compute alpha'-exact solutions and central charges for AdS_3 backgrounds in heterotic string theory, including explicit examples and insights into correction sources and supersymmetry relations.

Contribution

It introduces a novel approach for exact solution calculation in heterotic string backgrounds with AdS_3 factors, extending previous formalisms and providing new central charge results.

Findings

Chern-Simons terms are the main source of alpha'-corrections.

Results align with conjectures on the structure of the tree-level Lagrangian.

New alpha'-exact central charge results for complex AdS_3 backgrounds.

Abstract

We present a method for calculating solutions and corresponding central charges for backgrounds with AdS_3 and S^k factors in alpha'-exact fashion from the full tree-level low energy effective action of heterotic string theory. Three examples are explicitly presented: AdS_3 X S^3 X T^4, AdS_3 X S^2 X S^1 X T^4 and AdS_3 X S^3 X S^3 X S^1. Crucial property which enabled our analysis is vanishing of the Riemann tensor calculated from connection with "sigma-model torsion". We show the following: (i) Chern-Simons terms are the only source of alpha'-corrections not only in BPS, but also in non-BPS cases, suggesting a possible extension of general method of Kraus and Larsen, (ii) our results are in agreement with some conjectures on the form of the part of tree-level Lagrangian not connected to mixed Cern-Simons term by supersymmetry (and present in all supersymmetric string theories), (iii) new alpha'-exact result for central charges in AdS_3 X S^3 X S^3 X S^1 geometry. As a tool we used our generalization of Sen's entropy function formalism to AdS_p with p>2, and paid special attention to proper definition of asymptotic charges.