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Horizonless spacetimes as seen by present and next-generation Event Horizon Telescope arrays

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arxiv 2205.14883 v1 pith:4TN5QBLO submitted 2022-05-30 astro-ph.HE gr-qc

Astrid Eichhorn , Roman Gold , Aaron Held This is my paper · ORCID
classification astro-ph.HEgr-qc
keywords arraysblackhorizonlesseventfutureholehorizonimage
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We study the capabilities of present and future radio very-long-baseline-interferometry arrays to distinguish black holes from horizonless spacetimes. We consider an example of a horizonless spacetime, obtained by overspinning a regular black hole. Its image is distinct from the image of a Kerr spacetime due to a second set of photon rings interior to the shadow. These photon rings cannot be directly resolved by present and even next-generation Event Horizon telescope arrays, but instead imprint themselves in horizon-scale images as excess central brightness relative to that of a black hole. We demonstrate that future arrays can detect such indirect imprints.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Anisotropic gravastar as horizonless regular black hole spacetime and its images illuminated by thin accretion disk

    gr-qc 2024-11 conditional novelty 6.0 of 10

    The authors build an anisotropic gravastar model whose pressure profile and cut-off make it interpolate between a Hayward regular black hole and a horizonless ultracompact star, then compute shadow images for two accr...

  2. Towards a Non-singular Paradigm of Black Hole Physics

    gr-qc 2025-01 unverdicted novelty 1.0 of 10

    This is a review built around a week-long workshop, synthesizing the state and open problems of regular black holes and black hole mimickers as alternatives to singular black holes.

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