Particle-like ultracompact objects in Einstein-scalar-Gauss-Bonnet theories

Abstract

We present a new type of ultracompact objects, featuring lightrings and echoes in the gravitational-wave spectrum. These particle-like solutions arise in Einstein-scalar-Gauss-Bonnet theories in four spacetime dimensions, representing globally regular spacetime manifolds. The scalar field diverges at the center, but the effective stress-energy tensor is free from pathologies. We determine their domain of existence and compare with wormhole solutions, black holes and the Fisher solution.

7 pages, 4 figures, the analysis on the observable effects was extended, a new plot, comments and references were added, version published in Physics Letters B

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