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

Steven B. Giddings, Dimitrios Psaltis

Research output: Contribution to journalArticle

16 Citations (Scopus)

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 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.

Original languageEnglish (US)
Article number084035
JournalPhysical Review D
Volume97
Issue number8
DOIs
StatePublished - Apr 19 2018

Fingerprint

event horizon
astrophysics
telescopes
probes
horizon
time dependence
proposals
casts
time measurement
galaxies
radii

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Event Horizon Telescope observations as probes for quantum structure of astrophysical black holes. / Giddings, Steven B.; Psaltis, Dimitrios.

In: Physical Review D, Vol. 97, No. 8, 084035, 19.04.2018.

Research output: Contribution to journalArticle

@article{f05af2c524dd45e59274cb937ca8d44f,
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 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.",
author = "Giddings, {Steven B.} and Dimitrios Psaltis",
year = "2018",
month = "4",
day = "19",
doi = "10.1103/PhysRevD.97.084035",
language = "English (US)",
volume = "97",
journal = "Physical Review D",
issn = "2470-0010",
publisher = "American Physical Society",
number = "8",

}

TY - JOUR

T1 - Event Horizon Telescope observations as probes for quantum structure of astrophysical black holes

AU - Giddings, Steven B.

AU - Psaltis, Dimitrios

PY - 2018/4/19

Y1 - 2018/4/19

N2 - 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 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.

AB - 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 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.

UR - http://www.scopus.com/inward/record.url?scp=85047134223&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85047134223&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.97.084035

DO - 10.1103/PhysRevD.97.084035

M3 - Article

AN - SCOPUS:85047134223

VL - 97

JO - Physical Review D

JF - Physical Review D

SN - 2470-0010

IS - 8

M1 - 084035

ER -