Innermost stable circular orbit and shadow of the 4D Einstein–Gauss–Bonnet black hole

By Peng-Cheng Li. The European Physical Journal C, 2020

258 citations recorded by the source corpus.

Recently, a novel 4D Einstein–Gauss–Bonnet gravity was formulated by Glavan and Lin (Phys Rev Lett 124(8):081301, 2020). Although whether the theory is well defined is currently debatable, the spherically symmetric black hole solution is still meaningful and worthy of study. In this paper, we study the geodesic motions in the spacetime of the spherically symmetric black hole solution. First of all, we find that a negative GB coupling constant is allowable, as in which case the singular behavior of the black hole can be hidden inside the event horizon. Then we calculate the innermost stable circular orbits for massive particles, which turn out to be monotonic decreasing functions of the GB coupling constant. Furthermore, we study the unstable photon sphere and shadow of the black hole. It is interesting to find that the proposed universal bounds on black hole size in Lu and Lyu (Phys Rev D 101(4):044059, 2020) recently can be broken when the GB coupling constant takes a negative value.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/f06caf562c197c7cc636d8bb25ad338928e3fd28

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Citations in the corpus

Derivation of regularized field equations for the Einstein-Gauss-Bonnet theory in four dimensions (2020, methodology): “It has attracted a great deal of recent attention [10–44], In this work we investigate a method of regularizing the 4DEGB theory, in order to produce an action and set of field equations which are well defined in the limit D → 4, and which can be written in closed form.”
Influence of quintessence dark energy on the shadow of black hole (2020, background): “So far, the study of shadows of black holes has become a subject of great interest [12–39].”
Shadows and photon spheres with spherical accretions in the four-dimensional Gauss–Bonnet black hole (2020, background): “We first obtain the radius of the photon sphere and critical impact parameter for different Gauss-Bonnet constants, and find that the larger the Gauss-Bonnet constant is, the smaller the radius of the photon sphere and critical impact parameter will be, which is consistent with the previous results ”
The 4D Einstein–Gauss–Bonnet theory of gravity: a review (2022, background): “On the phenomenology side, the shadow, innermost-stablecircular-orbit (ISCO) and the quasi-normal modes of these black holes have been studied in references [59, 60].”