Galactic Pure Lovelock Blackholes: Geometry, stability, and Hawking temperature

Abstract

In this article, we will first-time model galactic black holes in pure Lovelock gravity. Even though working with higher spacetime dimensions, we assume (implicitly) the Hernquist-type mass profile for the galaxy in such a way that the horizon structure of a pure LoveLock black hole remains intact. In this way, we will model the galactic pure Lovelock black hole with arbitrary dimension ($d$) and order ($N$). Then, we will specialize this technique for critical dimension $d=3N+1$. We want to see how the galactic parameters affect the time domain single, quasinormal modes, photon sphere, innermost stable circular orbits (ISCO), and shadow radius. The time domain signal may allow us to identify the galactic parameters as well as to distinguish them from their isolated pure Lovelock counterparts if it is observed in future generations of gravitational wave measurements. We also calculate Hawking temperature for the same setup and want to see how Hawking's temperature will be affected due to the presence of a galaxy. It shows that the presence of a galactic halo can quench Hawking temperature.

19 pages, 3 figures

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• A direct empirical proof of the existence of dark matter
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Cited by in corpus (5)

• Greybody factors, reflectionless scattering modes, and echoes of ultracompact horizonless objects
• Pure Lovelock Gravity regular black holes
• Effect of generic dark matter halo on transonic accretion onto galactic black holes
• Klein-Gordon and Schrödinger solutions in Lovelock quantum gravity
• Excitation factors for horizonless compact objects: long-lived modes, echoes, and greybody factors