2018
DOI: 10.1103/physrevd.97.084035
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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 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 Tele… Show more

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Cited by 80 publications
(78 citation statements)
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“…The images used in our analysis in Section 7 measure the shape of the emitting region. In future work a similar analysis can be done using images from models that violate the no-hair theorem, where the photon ring/shadow shape can be highly prolate, oblate, or even amorphous (Broderick et al 2014;Giddings & Psaltis 2018).…”
Section: Implications For the Kerr Nature Of The Black Holementioning
confidence: 99%
“…The images used in our analysis in Section 7 measure the shape of the emitting region. In future work a similar analysis can be done using images from models that violate the no-hair theorem, where the photon ring/shadow shape can be highly prolate, oblate, or even amorphous (Broderick et al 2014;Giddings & Psaltis 2018).…”
Section: Implications For the Kerr Nature Of The Black Holementioning
confidence: 99%
“…If one assumes these fluctuations should lead to a minimal departure from Hawking's description of BH evolution, and in particular should not greatly alter the thermal spectrum of the BH emission [49] [48], the frequencies of the fluctuations should be of comparable to the thermal frequency, The period for Sgr A * is less than the EHT image scan time of several hours, making it hard to resolve such temporal fluctuation. This suggests the best sensitivity to such variation is from M87 observations.…”
Section: (B) Strong/coherent Scenariomentioning
confidence: 99%
“…GR predicts images with a particular structure, and specifically a "shadow" of the black hole with a bright "photon ring" just outside, resulting from gravitational lensing around the black hole. For example, in the case of soft quantum structure of [7], the necessary transfer of information may be accomplished by fluctuations with large magnitude, and simple models of such fluctuations can have significant impact on predicted images [15], including distortion of the photon ring and shadow, and the possibility of observable time dependence of the image. An open question is whether other versions of this soft scenario permit smaller, less-visible fluctuations, as newer work is suggesting [16].…”
Section: Oct 2017mentioning
confidence: 99%