Event Horizon Telescope observations as probes for quantum structure of astrophysical black holes

Giddings, Steven B.; Psaltis, Dimitrios

doi:10.1103/PhysRevD.97.084035

Title: Event Horizon Telescope observations as probes for quantum structure of astrophysical black holes

Journal Article · 19 April 2018 · Physical Review D

DOI: https://doi.org/10.1103/PhysRevD.97.084035 · OSTI ID:1600760

Giddings, Steven B. ^[1]; Psaltis, Dimitrios ^[2]

Univ. of California, Santa Barbara, CA (United States)
Univ. of Arizona, Tucson, AZ (United States)

The need for a consistent quantum evolution for black holes has led to proposals that their semiclassical description is modified not just near the singularity, but at horizon or larger scales. If such modifications extend beyond the horizon, they influence regions accessible to distant observeration. Natural candidates for these modifications behave like metric fluctuations, with characteristic length and time scales set by the horizon radius. In this study, we investigate the possibility of using the Event Horizon Telescope to observe these effects, if they have a strength sufficient to make quantum evolution consistent with unitarity. We find that such quantum fluctuations can introduce a strong time dependence for the shape and size of the shadow that a black hole casts on its surrounding emission. For the black hole in the center of the Milky Way, detecting the rapid time variability of its shadow will require non-imaging timing techniques. However, for the much larger black hole in the center of the M87 galaxy, a variable black-hole shadow, if present with these parameters, would be readily observable in the individual snapshots that will be obtained by the Event Horizon Telescope.

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Research Organization:: Univ. of California, Santa Barbara, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP); Foundational Questions Institute; National Aeronautics and Space Administration (NASA)

Grant/Contract Number:: SC0011702; FQXi-RFP-1507; NNX14AB48G; AST 1312034

OSTI ID:: 1600760

Alternate ID(s):: OSTI ID: 1433749

Journal Information:: Physical Review D, Vol. 97, Issue 8; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 50 works

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