Einstein-type structures, Besse's conjecture and a uniqueness result for a $\varphi$-CPE metric in its conformal class

TL;DR

This paper extends the CPE conjecture to manifolds with a structure relating curvature to a smooth map, proving rigidity and gap theorems that characterize spheres among such manifolds.

Contribution

It introduces the $( ext{φ-CPE})$ system, linking curvature and maps, and establishes new rigidity and characterization results for solutions within conformal classes.

Findings

Rigidity of solutions in conformal classes.

Characterization of round spheres among φ-CPE manifolds.

Solutions correspond to stationary points of a φ-scalar curvature functional.

Abstract

In this paper, we study an extension of the CPE conjecture to manifolds $M$ which support a structure relating curvature to the geometry of a smooth map $\varphi : M \to N$. The resulting system, denoted by $(\varphi-\mathrm{CPE})$, is natural from the variational viewpoint and describes stationary points for the integrated $\varphi$-scalar curvature functional restricted to metrics with unit volume and constant $\varphi$-scalar curvature. We prove both a rigidity statement for solutions to $(\varphi-\mathrm{CPE})$ in a conformal class, and a gap theorem characterizing the round sphere among manifolds supporting $(\varphi-\mathrm{CPE})$ with $\varphi$ a harmonic map.