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Chinese Physics C > 2022, Vol. 46 > Issue(10): 105104 DOI: 10.1088/1674-1137/ac7856

Tidal effects of a dark matter halo around a galactic black hole

  • 1.

    Department of Physics, Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal University, Changsha 410081, China

  • 2.

    Center for Gravitation and Cosmology, College of Physical Science and Technology, Yangzhou University, Yangzhou 225009, China

  • We investigate tidal forces and geodesic deviation motion in the spacetime of a black hole in a galaxy with a dark matter halo. Our results show that tidal forces and geodesic deviation motion depend on the mass of the dark matter halo and the typical lengthscale of the galaxy. The effect of the typical lengthscale of the galaxy on the tidal force is opposite to that of dark matter mass. With increasing dark matter mass, the radial tidal force increases in the region far from the black hole but decreases in the region near the black hole. Furthermore, the absolute value of angular tidal force monotonously increases with the dark matter halo mass. The angular tidal force also depends on the particle energy, and the effects of dark matter become more distinct for the test particle at higher energies, which differs from the behavior observed in typical static black hole spacetimes. We also present the change in the geodesic deviation vector with dark matter halo mass and the typical lengthscale of a galaxy under two types of initial conditions.
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Jiayi Liu, Songbai Chen and Jiliang Jing. Tidal effects of dark matter halo around a galactic black hole[J]. Chinese Physics C. doi: 10.1088/1674-1137/ac7856
Jiayi Liu, Songbai Chen and Jiliang Jing. Tidal effects of dark matter halo around a galactic black hole[J]. Chinese Physics C. doi:10.1088/1674-1137/ac7856 shu
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Received: 2022-05-04
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