Generalised Penrose Limits and PP-Waves

TL;DR

This paper develops generalized Penrose limits for massive type IIA supergravity solutions, producing supersymmetric pp-wave backgrounds and suggesting broader applicability to gauged supergravities.

Contribution

It introduces a method to construct generalized Penrose limits for massive supergravity solutions, leading to supersymmetric pp-wave backgrounds.

Findings

Generated supersymmetric pp-waves from massive IIA supergravity solutions.

Demonstrated the method's applicability to gauged supergravities.

Provided a framework for analyzing supergravity solutions via Penrose limits.

Abstract

In this paper we construct generalised Penrose limits for the solutions of massive type IIA supergravity. We consider a Freund-Rubin type solution and apply these {\it massive} Penrose limits and obtain supersymmetric pp-wave which is a standard type IIA background. We point out that results in this paper are easily generalised for the cases of gauged supergravities.