2025/04/07 by Martin-Dussaud, Pierre
#FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc)
paper · doi:10.48550/arxiv.2504.05492
The black-to-white hole scenario is a well-motivated proposal from non-perturbative quantum gravity concerning the final stage of black hole evaporation. In this framework, a black hole of initial mass M undergoes Hawking evaporation over a timescale of order M3 before tunneling into a long-lived white hole. Previous estimates suggest that the lifetime of the resulting white hole scales as M4. In this short note, I argue that such estimates neglect key aspects of the white hole's internal dynamics, and I demonstrate that a more consistent timescale for the white hole lifetime is of order M5.