The Last Eight Minutes of a Primordial Black Hole — mentioned by the8472

Fri, 24 Oct 2025 11:57:15 GMT

We do not what such a thing anywhere near Earth though. https://arxiv.org/abs/astro-ph/9911309

Paper and discussion history. A mention is not an endorsement.

The Last Eight Minutes of a Primordial Black Hole — mentioned by xenophonf

Thu, 13 Jan 2022 17:13:52 GMT

Not just black holes, but neutron stars and brown dwarfs, too. These studies ruled out MACHOs with masses in the range of 10^(−8) to 100 solar masses. That's 1/3rd the mass of the Moon to five times the mass of Betelgeuse. For black holes to be visible due to Hawking radiation against the cosmic microwave background, they would have to be pretty small, about 0.8% of the mass of Earth or about the mass of the Moon (https://arxiv.org/abs/astro-ph/9911309). I don't think anyone's found such a small black hole anywhere, yet. If they did, it would be a pretty big discovery since such a small black…

Paper and discussion history. A mention is not an endorsement.

The Last Eight Minutes of a Primordial Black Hole · HackerPapers discussions

The Last Eight Minutes of a Primordial Black Hole — mentioned by the8472

The Last Eight Minutes of a Primordial Black Hole — mentioned by xenophonf