Regular Article - Theoretical Physics
Collapsing dust thin shells in Einstein–Gauss–Bonnet gravity
School of Physical Sciences, University of Chinese Academy of Sciences, 100049, Beijing, China
2 Institute of Theoretical Physics, Chinese Academy of Sciences, 100190, Beijing, China
3 Institute of Mathematics, Academy of Mathematics and System Science, Chinese Academy of Sciences, 100190, Beijing, China
4 Hua Loo-Keng Key Laboratory of Mathematics, Chinese Academy of Sciences, 100190, Beijing, China
5 School of Mathematical Sciences, University of Chinese Academy of Sciences, 100049, Beijing, China
Accepted: 29 January 2022
Published online: 28 February 2022
We investigate gravitational collapse of a spherically symmetric thin shell in the Einstein–Gauss–Bonnet (EGB) gravity. Under the recently proposed 4D limit, we find that the collapsing shell will be bounced back at a small radius, without forming a singularity. This bouncing behavior is similar to those of a test particle and a homogeneous spherical dust star, in accordance with the expectation that the Gauss–Bonnet term will modify the small scale behavior of the Einstein gravity. We analyze the causal structure of the dynamic spacetime that represents the bouncing process, finding that the thin shell has an oscillation behavior on the Penrose diagram, which means that the thin shell results in a novel type of black hole with respect to observers outside the event horizon that the collapse forms. We also find that the weak cosmic censorship conjecture holds in this model. Further implications of such a regular gravitational collapse are discussed.
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