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

Abstract

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.

Authors:
 [1];  [2]
  1. Univ. of California, Santa Barbara, CA (United States)
  2. Univ. of Arizona, Tucson, AZ (United States)
Publication Date:
Research Org.:
Univ. of California, Santa Barbara, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP); Foundational Questions Institute; National Aeronautics and Space Administration (NASA)
OSTI Identifier:
1600760
Alternate Identifier(s):
OSTI ID: 1433749
Grant/Contract Number:  
SC0011702; FQXi-RFP-1507; NNX14AB48G; AST 1312034
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 97; Journal Issue: 8; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Quantum gravity; Astronomical black holes

Citation Formats

Giddings, Steven B., and Psaltis, Dimitrios. Event Horizon Telescope observations as probes for quantum structure of astrophysical black holes. United States: N. p., 2018. Web. doi:10.1103/PhysRevD.97.084035.
Giddings, Steven B., & Psaltis, Dimitrios. Event Horizon Telescope observations as probes for quantum structure of astrophysical black holes. United States. https://doi.org/10.1103/PhysRevD.97.084035
Giddings, Steven B., and Psaltis, Dimitrios. Thu . "Event Horizon Telescope observations as probes for quantum structure of astrophysical black holes". United States. https://doi.org/10.1103/PhysRevD.97.084035. https://www.osti.gov/servlets/purl/1600760.
@article{osti_1600760,
title = {Event Horizon Telescope observations as probes for quantum structure of astrophysical black holes},
author = {Giddings, Steven B. and Psaltis, Dimitrios},
abstractNote = {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.},
doi = {10.1103/PhysRevD.97.084035},
journal = {Physical Review D},
number = 8,
volume = 97,
place = {United States},
year = {2018},
month = {4}
}

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Cited by: 6 works
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