31 votes

How exactly does Hawking radiation decrease the mass of black holes?

I'm going to give you an intuitive answer. Keep in mind, this is not the "actual" answer, as the Hawking radiation is quite a bit more complex than the typical pop-sci explanation with virtual ...
Florin Andrei's user avatar
25 votes
Accepted

Explosions of black holes

What this video is talking about is Hawking Radiation, as you've linked. Hawking Radiation is a proposed hypothetical (by no means verified or proven) way for a black hole to radiate its energy into ...
zephyr's user avatar
  • 15k
21 votes
Accepted

What if the two Black Holes spiraling around each other are evaporating via their Hawking radiation?

Gravitational waves are efficiently emitted by massive black holes orbiting each other - the power emitted increases with mass. Hawking radiation on the other hand is a process that increases with ...
ProfRob's user avatar
  • 152k
9 votes

Would a black hole evaporate via Hawking radiation before you fall past the event horizon?

I've asked this question to a couple of physicists a few days ago. Great minds think alike, huh? First, bear in mind that Hawking radiation is only hypothetical. It is not theory. If we trust that ...
Sir Cumference's user avatar
9 votes

How exactly does Hawking radiation decrease the mass of black holes?

These lecture notes address the issues to some degree, especially on slides 33-35. Because in the strongly warped spacetime near the horizon, virtual particles made from vacuum fluctuations ...
Steve Linton's user avatar
  • 10.3k
8 votes
Accepted

Is there a better explanation of Hawking radiation?

Andy Gould proposed a classical derivation of Hawking radiation in a somewhat obscure paper from 1987. The essential argument is that a black hole must have a finite, non-zero entropy (otherwise you ...
J. O'Brien Antognini's user avatar
7 votes

Which wavelength is most likely to be emitted over the lifetime of a black hole by hawking radiation and which is most likely at any given time?

A black hole is black... and is a nearly perfect black-body radiator. It emits across the whole range of wavelengths, but the peak wavelength is given by Wien's law $$\lambda_* = 2.898×10^{-3} / T$$ ...
James K's user avatar
  • 122k
6 votes

Could Hawking radiation turn a black hole back into a star?

Black holes are not lumps of matter held together by gravity, but something very different. So while Hawking radiation will eventually make them evaporate and this process gets hotter and faster the ...
Anders Sandberg's user avatar
6 votes

What mass does an evaporating black hole have when it's schwarzschild radius equals the Planck length?

A black hole's Schwarzschild radius is $$R=\frac{2GM}{c^2}$$ In Planck units, $G=1$ and $c=1$, so the above reduces to $R=2M$ with mass and radius expressed in Planck units. Thus a black hole with a ...
David Hammen's user avatar
5 votes

Does the density of a black hole decrease after releasing a large amount of Hawking radiation?

The smaller a 'regular', stellar-mass black hole is, the denser it is inside of its event horizon, correct? Yes, that's correct. But the black hole density is a mean density, that is, it's just the ...
PM 2Ring's user avatar
  • 14.5k
5 votes

What does it mean that the radial coordinate becomes the time coordinate behind the horizon?

Please do NOT confuse what is happening with coordinates in General Relativity, with what anyone measures. When we refer to coordinates as "timelike" or "spacelike", this refers to ...
ProfRob's user avatar
  • 152k
5 votes
Accepted

Death of a Black Hole ≠ Rebirth?

A star needs more than "energy" to form. It needs fuel, in the form of hydrogen. In this distant era, there will no longer be clouds of hydrogen to collapse to form stars. So there will be ...
James K's user avatar
  • 122k
4 votes
Accepted

Can hawking radiation be eaten by another blackhole?

Black holes can "eat" Hawking radiation, but the radiation has to be directed towards the black hole before it can be "eaten". Black holes are pretty small, and space is very very very big. So as a ...
James K's user avatar
  • 122k
4 votes

How Does Black Hole Evaporation Look From the Inside?

An infalling observer cannot remain stationary inside the event horizon of a black hole. According to them, there is a short period of proper time before they meet whatever lies at the centre of the ...
ProfRob's user avatar
  • 152k
4 votes

Can Hawking Radiation ever be detected and does it exist?

How do we know Hawking radiation exists? Quantum Physics (Quantum Field Theory) and General Relativity are considered as the two main theories in physics, which can explain a broad range of phenomena ...
Ad Astra's user avatar
  • 258
4 votes
Accepted

Is it true that black holes emit only photons, electrons, and positrons in the form of Hawking Radiation?

When you look at Hawking's 1974 Nature paper (https://www.nature.com/articles/248030a0), it is very clear that like thermodynamic blackbodies, black holes can emit anything they want. Or to be more ...
Viktor Toth's user avatar
4 votes

How soon would an earth-mass black hole evaporate?

https://en.wikipedia.org/wiki/Hawking_radiation#Black_hole_evaporation gives the necessary formulae. And if you just want the answers then change the top line of this javascript calculator to 1 Earth ...
ProfRob's user avatar
  • 152k
4 votes

Do black holes emit dark matter as Hawking radiation?

Black holes are expected to be able to radiate every particle. There is no connection to what kinds of particles fell into the black hole. And indeed, evaporating black holes in the early universe ...
Sten's user avatar
  • 4,664
3 votes
Accepted

Calculating the black hole evaporation time

The derivation of life time formula for black holes: It is not difficult to approximately estimate the life time of a black hole. Since Hawking radiation is indeed a black-body radiation, the rate at ...
Ad Astra's user avatar
  • 258
3 votes

Black Hole / Hawking Radiation: Why only capture anti-particle?

First, I'd like to point out and commend @user83692435's reply which came first and is correct. Expanding on it: The image of a virtual particle/anti-particle pair being created and then one of the ...
Mark Olson's user avatar
  • 7,650
3 votes

Symmetry in Hawking radiation?

This assumes that when a pair particle-antiparticle is created, a bias towards antiparticles being captured and particles escaping must exist. No such assumption or bias exists. As far as we know ...
StephenG - Help Ukraine's user avatar
3 votes

Do black holes produce thermal radiation?

Hawking radiation is the black body radiation that black holes emit. It is a well established theoretical result but it has never been observed. For all currently known astrophysical black holes it ...
Chetan Pandey's user avatar
3 votes

A couple of questions on Hawking radiation

warning: Hawking radiation is not fully understood. Most calculations involving it are done in a semi-classical framework, where you combine quantum field theory with a classical black hole. That ...
Paul T.'s user avatar
  • 717
2 votes

Would a black hole evaporate via Hawking radiation before you fall past the event horizon?

As it has been mentioned in a comment by @zephyr, the infinite time issue is actually a non-issue. As you move closer to a black hole, the relative time to your point of view doesn't change in the ...
LaserYeti's user avatar
  • 736
2 votes

How exactly does Hawking radiation decrease the mass of black holes?

I don't know if the experts will agree with this description, but here is how I understand it: Both space and the event horizon are in constant quantum fluctuation. Essentially, the event horizon has ...
Alsee's user avatar
  • 121
2 votes

Does Hawking radiation in fact bring mass into the universe?

The black hole loses mass in order to generate the Hawking radiation. The energy carried by the radiation is exactly proportional to the mass lost by the black hole according to Einstein's formula E = ...
Florin Andrei's user avatar
2 votes

Is there a better explanation of Hawking radiation?

There is quite a nice explanation on this web page. A key passage is this: in curved spacetime there aren't these "best" co-ordinate systems, the inertial ones. So even very reasonable different ...
Steve Linton's user avatar
  • 10.3k
2 votes

Is Hawking radiation detectable?

The lifetime of a black hole to evaporation by Hawking radiation scales as the cube of its mass. If sufficiently low-mass black holes are created then they can evaporate on a timescale shorter than ...
ProfRob's user avatar
  • 152k

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