Hidden Symmerties in Dilaton--Axion Gravity

TL;DR

This paper explores hidden symmetries in a four-dimensional Einstein-Maxwell-dilaton-axion system with one Killing symmetry, revealing new solution-generating techniques through sigma-model formulations and target space isometries.

Contribution

It formulates the system as a three-dimensional sigma-model, uncovers hidden symmetries, and introduces new multicenter solutions using non-dualized variables.

Findings

Identification of hidden symmetries in the sigma-model

Development of solution-generating techniques

Construction of new multicenter solutions

Abstract

Four--dimensional Einstein--Maxwell--dilaton--axion system restricted to space--times with one non--null Killing symmetry is formulated as the three--dimensional gravity coupled sigma--model. Several alternative representations are discussed and the associated hidden symmetries are revealed. The action of target space isometries on the initial set of (non--dualized ) variables is found. New mulicenter solutions are obtained via generating technique based on the formulation in terms of the non--dualized variables.