Event Horizon Telescope observations as probes for quantum structure of astrophysical black holes
AffiliationUniv Arizona, Dept Astron, Tucson, AZ 85721 USA
Univ Arizona, Dept Phys, Tucson, AZ 85721 USA
MetadataShow full item record
PublisherAMER PHYSICAL SOC
CitationGiddings, S. B., & Psaltis, D. (2018). Event horizon telescope observations as probes for quantum structure of astrophysical black holes. Physical Review D, 97(8), 084035.
JournalPHYSICAL REVIEW D
Rights© 2018 American Physical Society
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at firstname.lastname@example.org.
AbstractThe 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 observation. Natural candidates for these modifications behave like metric fluctuations, with characteristic length scales and timescales set by the horizon radius. 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, without introducing new scales. 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 nonimaging 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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VersionFinal published version
SponsorsU.S. DOE [DE-SC0011702]; Foundational Questions Institute [FQXi-RFP-1507]; NASA TCAN award [NNX14AB48G]; NSF [AST 1312034]