Decomposable (6, 5)-solutions in eleven-dimensional supergravity

TL;DR

This paper constructs new eleven-dimensional supergravity backgrounds using twisted product manifolds, analyzing geometric constraints and linking to Ricci-flat Riemannian manifolds and Ricci-isotropic Walker manifolds.

Contribution

It introduces a novel class of decomposable (6, 5)-solutions in eleven-dimensional supergravity with explicit geometric constructions.

Findings

New supergravity backgrounds related to twisted product manifolds.

Connection between supergravity solutions and Ricci-flat Riemannian manifolds.

Identification of solutions involving Ricci-isotropic Walker manifolds.

Abstract

This paper presents a series of constructions providing eleven-dimensional bosonic supergravity backgrounds. In particular, we treat Lorentzian manifolds given in terms of twisted products of six-dimensional Lorentzian manifolds and five-dimensional Riemannian manifolds. By considering a representative flux 4-form adapted to this setting, we analyse the system of bosonic supergravity equations and describe the corresponding geometric constraints. The new supergravity backgrounds appear for special cases associated to the adapted flux 4-form. For example, we provide a relation of eleven-dimensional supergravity with Ricci-isotropic Walker manifolds, and illustrate several results in their terms and in terms of Ricci-flat Riemannian manifolds.