All $2D$ generalised dilaton theories from $d\ge 4$ gravities

Abstract

We demonstrate that generic two-dimensional Horndeski theories can arise from the reduction of pure gravities in $d\ge 4$ dimensions, and therefore generic onshell configurations for the two-dimensional metric and scalar field correspond to genuine $d$-dimensional gravitational vacuum solutions. We discuss separately the two-dimensional Horndeski theories which can arise from the reduction of $d$-dimensional generally covariant gravitational actions built only from curvature invariants without covariant derivatives and possessing second-order equations of motion on $2+(d-2)$ warped-product backgrounds. The discussion is subsequently extended to generic $d$-dimensional gravitational actions with this latter property. We establish a Birkhoff theorem for all gravitational theories whose reduction yields an integrable two-dimensional Horndeski theory, in which case static spherically symmetric solutions satisfy $g_{tt}{g}_{rr}=-1$ in Schwarzschild gauge whereby the metric function $g_{tt}=-f$ is determined by an algebraic equation. We therefore propose to refer to all such theories as quasi-topological gravities. These results can be used to show in reverse that any $d$-dimensional static spherically symmetric and asymptotically flat spacetime satisfying $g_{tt}{g}_{rr}=-1$ in Schwarzschild gauge with an invertible dependence of $f$ on the ADM mass can be reconstructed explicitly as a vacuum solution to a $d$-dimensional gravitational theory. We discuss examples of regular black holes such as the Bardeen spacetime, which could not be obtained from polynomial and non-polynomial quasi-topological gravities involving only curvature invariants without covariant derivatives.

38 pages; published version

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Cited by in corpus (1)

• Modified Friedmann equations and non-singular cosmologies in $d=4$ non-polynomial quasi-topological gravities