K-Models and Type IIB Superstring Backgrounds

TL;DR

This paper constructs new type IIB superstring backgrounds with Ramond-Ramond fields using K-models, demonstrating their exactness and incorporating $SL(2,R)$ symmetry as a solution-generating transformation.

Contribution

It introduces a novel method to generate exact type IIB backgrounds from K-models, extending previous results and utilizing symmetry transformations.

Findings

New exact type IIB backgrounds with Ramond-Ramond fields

Implementation of $SL(2,R)$ symmetry as a solution generator

Geometrical analysis confirming background exactness

Abstract

A family of type IIB superstring backgrounds involving Ramond-Ramond fields are obtained in ten dimensions starting from a K-model through a generalization of our recent results. The unbroken global $SL(2,R)$ symmetry of the type IIB equations of motion are implemented in this context as a solution generating transfromation. A geometrical analysis, based on the tensor structure of the higher order $\alpha^{\prime}$ terms in the equations of motion, is employed to show that these backgrounds are exact.