Black hole shadow and chaos bound violation in f(T) teleparallel gravity

Addazi, Andrea; Capozziello, Salvatore

doi:10.1016/j.physletb.2023.137828

Cited by 6 publications

(1 citation statement)

References 40 publications

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“…The properties of BH shadows can be used to assess both General Relativity and alternative theories of gravity [3,14], making it a crucial aspect to consider. Therefore, it is crucial to continue with theoretical efforts to calculate the forms of shadows created by BHs and BH mimickers in various theories of gravity and astrophysical settings [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. Shadow images can provide insight into various astrophysical phenomena, including accretion matter around BHs and the distribution of dark matter (DM) in the center of galaxies.…”

Section: Introductionmentioning

confidence: 99%

Dark matter spike around Bumblebee black holes

Capozziello

Zare

Mota

et al. 2023

J. Cosmol. Astropart. Phys.

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The effects of dark matter spike in the vicinity of the supermassive black hole, located at the center of M87 (the Virgo A galaxy), are investigated within the framework of the so-called Bumblebee Gravity. Our primary aim is to determine whether the background of spontaneous Lorentz symmetry breaking has a significant effect on the horizon, ergo-region, and shadow of the Kerr Bumblebee black hole in the spike region. For this purpose, we first incorporate the dark matter distribution in a Lorentz-violating spherically symmetric space-time as a component of the energy-momentum tensors in the Einstein field equations. This leads to a space-time metric for a Schwarzschild Bumblebee black hole with a dark matter distribution in the spike region and beyond. Subsequently, this solution is generalized to a Kerr Bumblebee black hole through the use of the Newman-Janis-Azreg-Aïnou algorithm. Then, according to the available observational data for the dark matter spike density and radius, and the Schwarzschild radius of the supermassive black hole in Virgo A galaxy, we examine the shapes of shadow and demonstrate the influence of the spin parameter a, the Lorentz-violating parameter ℓ and the corresponding dark matter halo parameters ρ 0 and r 0 on the deformation and size of the shadow.

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