Higher dimensional conformal metrics from PDEs and Null Surface Formulation of GR

TL;DR

This paper extends the Null Surface Formulation of General Relativity to higher dimensions, establishing a link between conformal metrics and PDEs, and deriving conditions for Einstein solutions.

Contribution

It introduces a higher-dimensional generalization of the Null Surface Formulation and provides explicit metric components and conditions for Einstein metrics.

Findings

Derived explicit expressions for higher-dimensional conformal metrics.

Extended the Null Surface Formulation to n dimensions.

Identified PDE conditions for Einstein metrics.

Abstract

We analyze the relationship between $n$-dimensional conformal metrics and a certain class of partial differential equations (PDEs) that are in duality with the eikonal equation. In particular, we extend the Null Surface Formulation of General Relativity to higher dimensions and give explicit expressions for the components of the metric and the generalized W\"{u}nschmann-like metricity conditions. We also compute the equation that the conformal factor must satisfy in order the metric be a solution of the Einstein equations.