Shadows and thin accretion disk images of the $\gamma $-metric - INSPIRE

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Shadows and thin accretion disk images of the $\gamma$ -metric

Rajibul Shaikh
(
- Indian Inst. Tech., Kanpur
)
,
Suvankar Paul
(
- Indian Inst. Tech., Kanpur and
- ICFAI U.
)
,
Pritam Banerjee
(
- Indian Inst. Tech., Kanpur
)
,
Tapobrata Sarkar
(
- Indian Inst. Tech., Kanpur
)

May 25, 2021

14 pages

Published in:

Eur.Phys.J.C 82 (2022) 8, 696

Published: Aug 10, 2022

e-Print:

2105.12057 [gr-qc]

DOI:

10.1140/epjc/s10052-022-10664-8

View in:

ADS Abstract Service

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Abstract: (Springer)

The

\gamma

-metric is a static, axially-symmetric singular solution of the vacuum Einstein’s equations without an event horizon. This is a two-parameter family of solutions, generic values of one of which (called

\gamma

) measure the deviation from spherical symmetry. We show that this can serve as a black hole mimicker, consistent with current observations. To this end, we first study the shadow cast by this geometry, in order to constrain the

\gamma

-metric from observations. We find that for

\gamma < 1/2

, there are, in principle, no shadows cast. On the other hand, shadows cast for all values of

\gamma \ge 1/2

are consistent with observations of M

87^*

by the Event Horizon Telescope. We also study images of thin accretion disks in the

\gamma

-metric background. In situations where the

\gamma

-metric possesses light rings, these qualitatively mimic Schwarzschild black holes with the same ADM mass, while in the absence of such rings, they are drastically different from the black hole case.

Note:

14 pages, 22 figures

vacuum: solution
Einstein equation: vacuum
solution: static
black hole: Schwarzschild
accretion
horizon
geometry
family
background
shadowing

References(44)

Figures(22)

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