3 ms·

I don't know physics very well, but I was under the impression that our current models said that the primordial black holes would have evaporated by now. Perha

• brainless 6y ago
  I think this is what you are referring to: https://en.wikipedia.org/wiki/Hawking_radiation#Black_hole_evaporation https://en.wikipedia.org/wiki/Hawking_radiation#Black_hole_e... "Hawking estimated that any black hole formed in the early universe with a mass of less than approximately 10^15 g would have evaporated completely by the present day."
  • scott_s 6y ago
    And the relevant part from the article discussing it: > The original idea dates back to the 1970s with the work of Stephen Hawking and Bernard Carr. Hawking and Carr reasoned that in the universe’s first fractions of a second, small fluctuations in its density could have endowed lucky — or unlucky — regions with too much mass. Each of these regions would collapse into a black hole. The size of the black hole would be dictated by the region’s horizon — the parcel of space around any point reachable at the speed of light. Any matter within the horizon would feel the black hole’s gravity and fall in. Hawking’s rough calculations showed that if the black holes were bigger than small asteroids, they could plausibly still be lurking in the universe today. This theory proposes the black holes would be big enough to still be around.
• tremon 6y ago
  Would that evaporation be independent of matter accretion? Wouldn't a black hole of any size be able to sustain itself depending on the availability of matter in its catchment radius? Or would black holes of smaller size not be able to capture enough matter to sustain themselves?