3 ms·

Although that pretty much means that Hawking radiation very much is a significant factor on any humanly achievable mass.

DuskStar 7y ago
And puts some hard, theoretical limits on using black holes as total conversion reactors. Reducing the power output to a terawatt requires 2x10^10kg... Probably not practical. (It would also have a radius of 0.03 femtometers. A proton? ~0.84)
- Roboprog 7y ago
  Is there a Planck constant type value for minimal singularities?
  - philipov 7y ago
    The mass of the smallest-possible black hole is called the Planck Mass (~21 micrograms). Such a black hole would have a Schwarzschild radius of 1 planck length, and would evaporate in 1 planck time. The planck mass is also considered to be the largest-possible mass of an elementary particle. https://en.wikipedia.org/wiki/Planck_mass https://en.wikipedia.org/wiki/Planck_mass
ClumsyPilot 7y ago
You are looking at something that weighs less than mount Everest and thinking that's an unrealistic amount of mass to control. In actual fact, moving mount Everest To The Moon is trivial in comparison with the task of creating a black hole. It's a feat only accessible to Kardashev type 2, at the very least 1.5, civilisations. We are talking about civilisations that can move small planets at will. The most credible approach is to build giant gamma-ray lasers, and focus so much energy into a spot to small, that the weight of light itself will collapse the spot into a tiny black hole made of pure energy, Kugelblitz. Once you would have a black hole formed that way, you could continue force-feeding it with lasers or particle beams to weigh whatever amount you desire. It would be a very energy-inefficient process. At some point the black hole reaches a mass where it's Eddington limit allows it to feed by 'normal' means faster than it evaporates by hawking radiation. At that point it could server to convert matter to energy.
- Roboprog 7y ago
  Sounds like fusion: there’s a big gap between making it happen for a moment and actually using it. ... Ignoring the HUGE gap between smashing together a few atoms so a small fraction of their bits evaporate and smashing them so hard they pretty much disappear.

DuskStar 7y ago

And puts some hard, theoretical limits on using black holes as total conversion reactors. Reducing the power output to a terawatt requires 2x10^10kg... Probably not practical. (It would also have a radius of 0.03 femtometers. A proton? ~0.84)

Roboprog 7y ago
Is there a Planck constant type value for minimal singularities?
- philipov 7y ago
  The mass of the smallest-possible black hole is called the Planck Mass (~21 micrograms). Such a black hole would have a Schwarzschild radius of 1 planck length, and would evaporate in 1 planck time. The planck mass is also considered to be the largest-possible mass of an elementary particle. https://en.wikipedia.org/wiki/Planck_mass https://en.wikipedia.org/wiki/Planck_mass

ClumsyPilot 7y ago

You are looking at something that weighs less than mount Everest and thinking that's an unrealistic amount of mass to control. In actual fact, moving mount Everest To The Moon is trivial in comparison with the task of creating a black hole. It's a feat only accessible to Kardashev type 2, at the very least 1.5, civilisations. We are talking about civilisations that can move small planets at will. The most credible approach is to build giant gamma-ray lasers, and focus so much energy into a spot to small, that the weight of light itself will collapse the spot into a tiny black hole made of pure energy, Kugelblitz. Once you would have a black hole formed that way, you could continue force-feeding it with lasers or particle beams to weigh whatever amount you desire. It would be a very energy-inefficient process. At some point the black hole reaches a mass where it's Eddington limit allows it to feed by 'normal' means faster than it evaporates by hawking radiation. At that point it could server to convert matter to energy.

Roboprog 7y ago
Sounds like fusion: there’s a big gap between making it happen for a moment and actually using it. ... Ignoring the HUGE gap between smashing together a few atoms so a small fraction of their bits evaporate and smashing them so hard they pretty much disappear.