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

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arxiv 1910.02121 v2 pith:YEUQJQUR submitted 2019-10-04 gr-qc hep-th

classification gr-qchep-th
keywords einstein-scalar-gauss-bonnetobjectsparticle-likesolutionsspacetimetheoriesultracompactarise
verification ladder T0 review T1 audit T2 compute T3 formal
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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.

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