What the study found
The study found that, compared with a Kerr black hole, a Kerr-de Sitter black hole can produce higher energy return on investment (EROI) and higher single-extraction energy capability in the repetitive Penrose process. The results also depend on the cosmological parameter and the decay radius.
Why the authors say this matters
The authors present these findings as extending earlier work on the repetitive Penrose process in black holes, and as showing how the cosmological parameter influences the process in Kerr-de Sitter black holes. The study suggests that these differences matter for how much energy can be obtained under repeated extraction.
What the researchers tested
The researchers studied the repetitive Penrose process in a Kerr-de Sitter black hole and examined how the cosmological parameter affects it. They compared the Kerr-de Sitter case with the Kerr black hole and considered energy return on investment, single-extraction energy capability, energy utilization efficiency (EUE), and extracted energy.
What worked and what didn't
The Kerr-de Sitter black hole showed stronger EROI and single-extraction energy capability than the Kerr black hole, and these increased as the cosmological parameter became larger. At a lower decay radius, the Kerr black hole had higher EUE and more extracted energy after the repetitive process was completed. At a higher decay radius, the Kerr-de Sitter black hole had higher EUE and more extracted energy, which the abstract links to the stopping condition of the iteration.
What to keep in mind
The abstract does not describe detailed limitations beyond the comparison conditions it studied. The reported findings are specific to the repetitive Penrose process, the Kerr-de Sitter and Kerr black holes, and the parameter settings mentioned in the abstract.
Key points
- Kerr-de Sitter black holes showed higher EROI and single-extraction energy capability than Kerr black holes in the repetitive Penrose process.
- A larger cosmological parameter was associated with stronger EROI and stronger single-extraction energy capability.
- At lower decay radius, Kerr black holes had higher energy utilization efficiency and more extracted energy after the process ended.
- At higher decay radius, Kerr-de Sitter black holes had higher energy utilization efficiency and more extracted energy.
- The abstract attributes the higher-energy result at higher decay radius to the stopping condition of the iteration.
Disclosure
- Research title:
- Kerr-de Sitter black holes show stronger repetitive energy return
- Authors:
- Ke Wang, Xiao-Xiong Zeng
- Institutions:
- Chongqing Jiaotong University, Chongqing Normal University
- Publication date:
- 2026-04-24
- OpenAlex record:
- View
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