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arXiv · 2512.01349

AdS gravastar and its signatures from dual conformal field theory

Heng-Yu Chen·Yasuaki Hikida·Yasutaka Koga
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Abstract

Quantum gravity effects are expected to resolve the black hole singularity and the effects may deform the region near but outside the horizon. Applying AdS/CFT correspondence, we see their signatures from the viewpoint of dual conformal field theory. As a regularized geometry, we consider AdS gravastar constructed by gluing AdS-Schwarzschild and de Sitter spacetime. The retarded Green functions of dual conformal field theory have bulk-cone singularities associated with null trajectories in the bulk and we obtain the singularities specific to a horizon-less geometry. We also observe echoes coming from waves reflected behind the photon sphere. The existence of echoes implies the modification of geometry inside the photon sphere.

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Heng-Yu Chen, Yasuaki Hikida, Yasutaka Koga. 2025-12-01. AdS gravastar and its signatures from dual conformal field theory. https://doi.org/10.1103/6cbs-c9n2

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