fnctId=bbs,fnctNo=11969
- 작성일
- 2021.04.09
- 수정일
- 2021.04.09
- 작성자
- 염동한
- 조회수
- 125
[Physical Review Letters] Testing loop quantum gravity from observational consequences of nonsingular rotating black holes
Testing loop quantum gravity from observational consequences of nonsingular rotating black holes
Phys. Rev. Lett.
Suddhasattwa Brahma, Che-Yu Chen, and Dong-han Yeom
Accepted 8 April 2021
ABSTRACT
The lack of rotating black hole models, which are typically found in nature, in loop quantum gravity (LQG) substantially hinders the progress of testing LQG from observations. Starting with a non-rotating LQG black hole as a seed metric, we construct a rotating spacetime using the revised Newman-Janis algorithm. The rotating solution is non-singular everywhere and it reduces to the Kerr black hole asymptotically. In different regions of the parameter space, the solution describes {i)} a wormhole without event horizon (which, we show, is almost ruled out by observations), {ii)} a black hole with a spacelike transition surface inside the event horizon, or {iii)} a black hole with a timelike transition region inside the inner horizon. It is shown how fundamental parameters of LQG can be constrained by the observational implications of the shadow cast by this x-object. The causal structure of our solution depends crucially only on the spacelike transition surface of the non-rotating seed metric, while being agnostic about specific details of the latter, and therefore captures universal features of an effective rotating, non-singular black hole in LQG.
Phys. Rev. Lett.
Suddhasattwa Brahma, Che-Yu Chen, and Dong-han Yeom
Accepted 8 April 2021
ABSTRACT
The lack of rotating black hole models, which are typically found in nature, in loop quantum gravity (LQG) substantially hinders the progress of testing LQG from observations. Starting with a non-rotating LQG black hole as a seed metric, we construct a rotating spacetime using the revised Newman-Janis algorithm. The rotating solution is non-singular everywhere and it reduces to the Kerr black hole asymptotically. In different regions of the parameter space, the solution describes {i)} a wormhole without event horizon (which, we show, is almost ruled out by observations), {ii)} a black hole with a spacelike transition surface inside the event horizon, or {iii)} a black hole with a timelike transition region inside the inner horizon. It is shown how fundamental parameters of LQG can be constrained by the observational implications of the shadow cast by this x-object. The causal structure of our solution depends crucially only on the spacelike transition surface of the non-rotating seed metric, while being agnostic about specific details of the latter, and therefore captures universal features of an effective rotating, non-singular black hole in LQG.
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