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  Does the black hole shadow probe the event horizon geometry?

Cunha, P. V. P., Herdeiro, C. A. R., & Rodriguez, M. J. (2018). Does the black hole shadow probe the event horizon geometry? Physical Review D, 97: 084020. doi:10.1103/PhysRevD.97.084020.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-4107-E Version Permalink: http://hdl.handle.net/21.11116/0000-0002-E98E-8
Genre: Journal Article

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 Creators:
Cunha, Pedro V. P., Author
Herdeiro, Carlos A. R., Author
Rodriguez, Maria J.1, Author              
Affiliations:
1Gravitation and Black Hole Theory, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_2477691              

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Free keywords: General Relativity and Quantum Cosmology, gr-qc, Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE,High Energy Physics - Theory, hep-th
 Abstract: There is an exciting prospect of obtaining the shadow of astrophysical black holes (BHs) in the near future with the Event Horizon Telescope. As a matter of principle, this justifies asking how much one can learn about the BH horizon itself from such a measurement. Since the shadow is determined by a set of special photon orbits, rather than horizon properties, it is possible that different horizon geometries yield similar shadows. One may then ask how sensitive is the shadow to details of the horizon geometry? As a case study, we consider the double Schwarzschild BH and analyse the impact on the lensing and shadows of the conical singularity that holds the two BHs in equilibrium -- herein taken to be a strut along the symmetry axis in between the two BHs. Whereas the conical singularity induces a discontinuity of the scattering angle of photons, clearly visible in the lensing patterns along the direction of the strut's location, it produces no observable effect on the shadows, whose edges remain everywhere smooth. The latter feature is illustrated by examples including both equal and unequal mass BHs. This smoothness contrasts with the intrinsic geometry of the (spatial sections of the) horizon of these BHs, which is not smooth, and provides a sharp example on how BH shadows are insensitive to some horizon geometry details. This observation, moreover, suggests that for the study of their shadows, this static double BH system may be an informative proxy for a dynamical binary.

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 Dates: 2018-02-072018
 Publication Status: Published in print
 Pages: 15 pages, 9 figures
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1802.02675
DOI: 10.1103/PhysRevD.97.084020
URI: http://arxiv.org/abs/1802.02675
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Title: Physical Review D
  Other : Phys. Rev. D.
Source Genre: Journal
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Publ. Info: Lancaster, Pa. : American Physical Society
Pages: - Volume / Issue: 97 Sequence Number: 084020 Start / End Page: - Identifier: ISSN: 0556-2821
CoNE: /journals/resource/111088197762258