On the inverse hoop conjecture of Hod

被引:3
|
作者
Nandi, K. K. [1 ,2 ]
Izmailov, R. N. [1 ]
Potapov, A. A. [3 ]
Migranov, N. G. [4 ]
机构
[1] M Akmullah Bashkir State Pedag Univ, Zeldovich Int Ctr Astrophys, 3A,October Revolut St, Ufa 450008, RB, Russia
[2] Univ North Bengal, High Energy Cosm Ray Res Ctr, Darjeeling 734013, WB, India
[3] Bashkir State Univ, Dept Phys & Astron, 47A,Lenin St, Sterlitamak 453103, RB, Russia
[4] Bashkir State Med Univ, Dept Med Phys & Informat, 3 Lenina St, Ufa 450008, RB, Russia
来源
EUROPEAN PHYSICAL JOURNAL C | 2021年 / 81卷 / 11期
关键词
D O I
10.1140/epjc/s10052-021-09791-5
中图分类号
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号
摘要
Recently, Hod has shown that Thorne's hoop conjecture (C(R) /4 pi M(r <= R) <= 1 double right arrow horizon) is violated by stationary black holes and so he proposed a new inverse hoop conjecture characterizing such black holes (that is, horizon double right arrow H = pi A/C-eq(2) <= 1). In this paper, it is exemplified that stationary hairy black holes, endowed with Lorentz symmetry violating Bumblebee vector field related to quantum gravity and dilaton field of string theory, also respect the inverse conjecture. It is shown that stationary hairy singularity, recently derived by Bogush and Galt'sov, does not respect the conjecture thereby protecting it. However, curiously, there are two horizonless stationary wormholes that can also respect the conjecture. Thus one may also state that throat double right arrow H <= 1, suggesting that the inverse conjecturemay be a necessary but not sufficient proposition.
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页数:4
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