Is Stephen Hawking’s evaporation of black holes wrong? – Black Hole as a new candidate for dark matter –

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Apr. 23 Wed
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Campus: Mitaka
Seminar: NAOJ Science Colloquium
Date and time: 2025 April 23 (Wed.), 15:30-16:30 JST
Place: The insei seminar room of Subaru Building / Zoom (hybrid)

Speaker: Kazunori Kohri
Affiliation: DoS, NAOJ
Title: Is Stephen Hawking’s evaporation of black holes wrong? – Black Hole as a new candidate for dark matter –
Abstract: Last year, Prof. Gia Dvali, an expert in quantum gravity theory, criticized Stephen Hawking’s proposal for calculating the evaporation of black holes due to Hawking radiation, insisting that the initial conditions assumed were not appropriate, and if he added the back reaction (the Memory Burden Effect) from the entropy of Hawking radiation emitted by the black hole itself to the calculation, the lifetime of the black hole should be extended even further. Researchers around the world were surprised. My group (Thoss, Burkert and Kohri, MNRAS, 2024, arXiv:2402.17823) was quick to incorporate this correction and pointed out that primordial black holes that have existed since the early Universe may have remained and become dark matter without evaporating. I will explain this topic, which is still the subject of heated debate, in an easy-to-understand way for non-experts in this seminar. https://arxiv.org/abs/2402.17823