arXiv: High Energy Physics - Theory | 2019
$\\mathbf{O}(D,D)$ completion of the Einstein Field Equations
Abstract
Upon treating the whole closed-string massless NS-NS sector as stringy graviton fields, Double Field Theory may evolve into `Stringy Gravity . In terms of an $\\mathbf{O}(D,D)$ covariant differential geometry beyond Riemann, we present the definitions of the off-shell conserved stringy Einstein curvature tensor and the on-shell conserved stringy Energy-Momentum tensor. Equating them, all the equations of motion of the massless sector are unified into a single expression, $G_{AB}{=8\\pi G} T_{AB}$, carrying $\\mathbf{O}(D,D)$ vector indices, which we dub `the Einstein Double Field Equations .