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Observational signatures of hot spots orbiting horizonless objects

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arxiv 2205.11541 v2 pith:Z6DWHPIX submitted 2022-05-23 gr-qc

João Luís Rosa , Paulo Garcia , Frédéric H. Vincent , Vitor Cardoso This is my paper · ORCID
classification gr-qc
keywords objectscentralblackcompactfeatureholeshorizonhorizonless
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Pushed by a number of advances, electromagnetic observatories have now reached the horizon scale of supermassive black holes. The existence and properties of horizons in our universe is one of the outstanding fundamental issues that can now be addressed. Here we investigate the ability to discriminate between black holes and compact, horizonless objects, focusing on the lensing of hot spots around compact objects. We work in particular with boson and Proca stars as central objects, and show that the absence of a horizon gives rise to a characteristic feature -- photons that plough through the central object and produce an extra image. This feature should be universal for central objects made of matter weakly coupled to the standard model.

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Cited by 3 Pith papers

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

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  2. Massive boson stars: Stability and GW emission in head-on mergers

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    Quartically self-interacting massive boson stars are stable only up to the first mass maximum; their head-on mergers yield a boson-star remnant, a black hole at contact, or two black holes formed before contact, with ...

  3. Observational Signatures of Janis-Newman-Winicour Strongly Naked Singularity

    gr-qc 2025-05 conditional novelty 5.0 of 10

    Light rays that turn around near a JNW strongly naked singularity produce paired lensed images and characteristic brightness curves that differ from black hole images.

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