Induced almost para-K\"ahler Einstein metrics on cotangent bundles

TL;DR

This paper explores the construction of almost para-K"ahler--Einstein metrics on cotangent bundles derived from specific geometric structures on manifolds, providing explicit formulas for various structures.

Contribution

It extends previous work by relating these metrics to Patterson--Walker metrics and deriving explicit formulas for projective, conformal, and Grassmannian structures.

Findings

Explicit formulas for almost para-K"ahler--Einstein metrics on cotangent bundles.

Connections between these metrics and Patterson--Walker metrics.

Applications to projective, conformal, and Grassmannian geometries.

Abstract

In earlier work we have shown that for certain geometric structures on a smooth manifold $M$ of dimension $n$, one obtains an almost para-K\"ahler--Einstein metric on a manifold $A$ of dimension $2n$ associated to the structure on $M$. The geometry also associates a diffeomorphism between $A$ and $T^*M$ to any torsion-free connection compatible with the geometric structure. Hence we can use this construction to associate to each compatible connection an almost para-K\"ahler--Einstein metric on $T^*M$. In this short article, we discuss the relation of these metrics to Patterson--Walker metrics and derive explicit formulae for them in the cases of projective, conformal and Grassmannian structures.