Skip to main content

Questions tagged [hawking-radiation]

For questions about Hawking radiation, emitted by black holes and causing them to slowly evaporate. Use together with the [black-hole] tag.

Filter by
Sorted by
Tagged with
0 votes
0 answers
22 views

Is the hypothetical '(Don) Page curve' of evaporating black holes equal in time, so to speak, on both sides of the curve?

I have heard that Hawking radiation is slow at first, but rapidly increases when the black hole becomes much smaller... (I forget the formula...) Does that mean that the second half of Page's curve, ...
Kurt Hikes's user avatar
  • 5,177
3 votes
1 answer
162 views

A couple of questions on Hawking radiation

Black holes progressively evaporate due to the emission of Hawking radiation just outside their event horizon primarily in the form of photons. However, there is a small probability that they emit ...
vengaq's user avatar
  • 1,017
1 vote
1 answer
107 views

Death of a Black Hole ≠ Rebirth?

So we all know that Stephen Hawking proved that Black Holes do evaporate overtime through hawking radiation. But that energy is released in very discrete amounts and there will be a time in the ...
Shubhankar Dixit's user avatar
1 vote
1 answer
120 views

In the case of heat death of our universe, would proton decay overtake the singularity decay due to Hawking radiation?

According to GUT (The Grand Unified Theory), the half life of protons is 1.67×10^34 years if the standard model is incorrect and the time black holes take to evaporate due to hawking radiation is more ...
Arjun's user avatar
  • 1,474
4 votes
1 answer
984 views

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?

What equations tells us the most likely wavelength emitted for a given black hole mass at any instant in time and over the whole life of the black hole?
user avatar
1 vote
1 answer
170 views

Do black holes emit dark matter as Hawking radiation?

When a star made from protons neutrons and electrons becomes a black hole that black hole can emit protons neutrons and electrons as Hawking radiation. Dark matter is unusual matter: is there any ...
user avatar
1 vote
2 answers
156 views

What is the variation in the time it takes a black hole to evaporate from Hawking radiation?

I often see figures of how long it would take a black hole of a given mass to evaporate away due to Hawking Radiation. The wiki page itself mentions that a black hole of about $10^{11}$ kg takes ...
zibadawa timmy's user avatar
2 votes
0 answers
47 views

Is frame dragging expected to be quantized in a theory of quantum gravity?

Protons and electrons have angular momentum which is quantized. Would the angular momentum of black holes be quantized in quantum gravity? Would this then affect Hawking radiation?
user avatar
3 votes
1 answer
117 views

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

I am referring to Hawking radiation and the decrease in mass of the black hole with time
user avatar
4 votes
1 answer
98 views

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

The time and radial coördinate change are exchanged with one another behind the black hole horizon. So even stating that it's happening behind the horizon is misleading. There is, as a figure of ...
Felicia's user avatar
3 votes
1 answer
191 views

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

Would a black hole after eons of losing mass due to Hawking radiation, eventually turn into a burning star again? As it’s pressure will no longer be overwhelmed by the gravity it once had and through ...
eBookworm's user avatar
  • 145
0 votes
1 answer
1k views

How soon would an earth-mass black hole evaporate?

A raft of related questions: Is an Earth-mass black hole even possible? Assuming Hawking Radiation (HR) is a fact (has it been verified yet?), would HR cause an earth-mass black hole to evaporate ...
Cyberherbalist's user avatar
2 votes
2 answers
153 views

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

Is is true that the smaller a 'regular', stellar-mass black hole is, the denser it is inside of its event horizon? After all, if you look up (or calculate) the Schwarzschild radii of the Sun and the ...
Kurt Hikes's user avatar
  • 5,177
4 votes
2 answers
621 views

How can a black hole merger create a black hole with an event horizon surface area larger than the sum of the two original areas?

Many popular and professional science sites said something about Stephen Hawking's black hole area theorem being proven observationally, finally, not just mathematically, to 95% confidence. For ...
Kurt Hikes's user avatar
  • 5,177
0 votes
0 answers
104 views

How can Hawking radiation consist out of photons?

It is assumed in some explanations that Hawking radiation origins in virtual particle pairs getting real near the horizon of a black hole (the tidal force tearing them apart). But how can this be when ...
Deschele Schilder's user avatar
0 votes
1 answer
85 views

What is Hawking radiation? [closed]

Like the radiation the Sun gives out to sustain it's circular shape, will Hawking radiation sustain the black hole's shape?
yor's user avatar
  • 21
4 votes
1 answer
392 views

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

According to this comment, if the peak photon energy is 511 KeV, electrons and antielectrons begin to be produced along with photons. So when the peak energy is ~940 MeV, the rest mass of a proton, ...
WarpPrime's user avatar
  • 6,683
5 votes
0 answers
55 views

What scales and types of EM and gravitational radiation do we expect to be given off by a black hole, in the final stages of evaporation?

In theory, black holes of all sizes eventually evaporate, due to quantum processes close to the event horizon that result in net emissions that appear to come from the black hole (but actually ...
Stilez's user avatar
  • 1,022
3 votes
1 answer
1k views

Can Hawking Radiation ever be detected and does it exist? [duplicate]

I'm researching black hole Hawking radiation for a contest, and so far I get the overall gist of how the process works. But as far as I've searched, there hasn't been any confirmed observational ...
AdiBak's user avatar
  • 655
0 votes
1 answer
418 views

Does Hawking Radiation really exist and Why "negative energy" in virtual particles? [duplicate]

I'm doing some research on black holes for a science video contest - more specifically, on Hawking Radiation. As far as I know, there are these constant quantum fluctuations of "virtual" ...
AdiBak's user avatar
  • 655
2 votes
1 answer
5k views

Calculating the black hole evaporation time

Black holes evaporate very, very slowly by emitting Hawking radiation, and eventually they disappear, maybe even during the lifetime of the universe ($\sim 1.5 \times 10^{18}{\rm s}$). That's what I ...
B--rian's user avatar
  • 5,626
1 vote
2 answers
540 views

Why is a black hole's Hawking radiation temperature inversely proportional to its mass/size?

As a black hole shrinks in volume and mass, shouldn't its temperature get lower? Shouldn't it evaporate more slowly? Naively, (very naively), I think that with a smaller surface area (as per its ...
Kurt Hikes's user avatar
  • 5,177
5 votes
2 answers
2k views

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

A non-technical explanation In a Gravitational Wave event, the point is that in this event when Black Holes are spiraling around each other, they will cause the very fabric of Space-time to ripple and ...
A High School Student's user avatar
2 votes
0 answers
87 views

How does hawking radiation work without virtual particles?

How does hawking radiation work without the existence for virtual particles? I read that certain quantum fields are distorted when a black hole forms on top of them. But what fields specifically? If ...
Orangeman's user avatar
5 votes
3 answers
406 views

Is Hawking radiation detectable?

Could Hawking radiation be detected with instruments available today? If not, what sort of instruments would be required to observe it? Would there be any way to confirm through observations the ...
usernumber's user avatar
  • 17.6k
2 votes
1 answer
216 views

What's the point with Hawking Radiation? [duplicate]

I saw that Black Holes can evaporate because of Hawking radiation. Because pair of particle, antiparticle can spawn at any point of the space, the antiparticle could be absorbed by the black hole and ...
Raphaël Frantz's user avatar
1 vote
1 answer
182 views

How much starlight do black holes absorb?

Can it be calculated how much light from other stars a black hole of certain sizes would absorb? And how long will it take for the number of active stars to decrease to the point where Hawking ...
Snowshard's user avatar
  • 111
0 votes
1 answer
88 views

Control the behavior of a Black Hole

Is it possible to manipulate the size of a black hole or how a black hole behaves if scientists were able to synthesize hawking radiation on demand. That is, if I could find a way to imitate hawking ...
Logikal's user avatar
  • 245
38 votes
5 answers
7k views

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

From what I understand so far, when one of virtual particles crosses the event horizon and the other does not, they can not annihilate each other. The latter wanders off into the universe (btw, is it ...
marko-36's user avatar
  • 621
2 votes
1 answer
156 views

Can hawking radiation be eaten by another blackhole?

Just a theory, from this video. At last, only the black holes are gonna exist and even they'll decay because of hawkings radiation. As black holes emit hawkings radiation, then if one emits it, ...
Arshdeep Singh's user avatar
0 votes
2 answers
228 views

Information Paradox with Hawking's Radiation

A theory about Blackholes storing the information from the universe. Being said that Blackholes are condensed mass sufficient enough to break every particle into different elementary particles, ...
Arshdeep Singh's user avatar
2 votes
1 answer
1k views

Does Hawking radiation in fact bring mass into the universe?

As I understand virtual particles pairs, e.g. electron and positron spontaneously pop into existence for tiny period of time, then they annihilate. When virtual electron and virtual positron ...
zuba's user avatar
  • 121
0 votes
0 answers
53 views

Do anti-particle black hole exist and can they evaporate? [duplicate]

I know that virtual particles are constantly be created and annihilated even in a complete vacuum, I like to know if there exist such a mechanism to spawn an anti-particle black hole can be any size ...
user6760's user avatar
  • 2,501
12 votes
2 answers
1k views

Is there a better explanation of Hawking radiation?

I'm writing a piece on Hawking radiation, and find I have something of a problem. The "given" explanation which I find on Wikipedia and elsewhere is unsatisfactory: "Physical insight into the ...
John Duffield's user avatar
2 votes
1 answer
363 views

Symmetry in Hawking radiation?

I have a question concerning how Hawking radiation works. As I understand, a pair of particle-antiparticle may pop to existence near the event horizon (from a virtual particle). Then it might happen ...
Elerium115's user avatar
4 votes
0 answers
62 views

How can X-rays be emitted from a black hole? [duplicate]

A black hole's gravity prevents light from escaping, how can a black hole emit X-rays? Visible light and X-rays are both electromagnetic radiation, shouldn't the black hole's gravity prevent X-rays ...
Harsh Kumar's user avatar
1 vote
1 answer
664 views

Do black holes produce thermal radiation?

Do black holes produce thermal radiation, as expected on theoretical grounds? Does this radiation contain information about their inner structure, as suggested by gauge–gravity duality, or not, as ...
Darth Ewok's user avatar
25 votes
3 answers
3k views

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

It takes an infinite amount of time for something to fall past the event horizon of a black hole from the perspective of someone outside the event horizon. Black holes also evaporate after a finite ...
Thomas's user avatar
  • 381
20 votes
2 answers
3k views

Explosions of black holes

I was bopping around YouTube and observed this enjoyably produced video. In it, when describing the behavior of a black hole with the mass of a US nickel, the narrator says, "Its 5 grams of mass ...
pdm's user avatar
  • 311
3 votes
2 answers
705 views

Eternally collapsing objects?

As has been pointed out by some scientists, that black holes aren't stable bodies but are eternally collapsing objects. How does one come to such a conclusion? Is hawking radiation related to this in ...
Victor Juliet's user avatar
6 votes
2 answers
1k views

How Does Black Hole Evaporation Look From the Inside?

Imagine you're inside a black hole event horizon. The curvature of spacetime is such that the direction towards the singularity becomes timelike, as reverse movement becomes literally impossible. How ...
Serban Tanasa's user avatar
16 votes
1 answer
820 views

Is it safer to be near a star or a black hole?

If a star or black hole neared the solar system, which would do the least damage? For the sake of a good comparison, lets assume the candidate star is an "average" 5 solar mass star, and the black ...
Jonathan's user avatar
  • 4,381
23 votes
4 answers
9k views

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

I may have some specifics wrong here. If so, don't focus on those. Just focus on the general thrust of my question. I "understand" (cough) that particle/anti-particle pairs form spontaneously in ...
user3355020's user avatar
5 votes
2 answers
335 views

What does black hole evaporation correspond to in the accelerating universe / black hole analogy?

In the same way, as a black hole emits Hawking radiation corresponding to its temperature $$ T = \frac{\hbar}{r_{BH}} $$ the accelerating universe can be described as all of the stuff falling ...
Dilaton's user avatar
  • 809
5 votes
1 answer
165 views

What happens to the shrinking universe in the presence of the pressure of Hawking radiation?

Black holes release Hawking radiation. Now assume that the universe after all collapses back again, bringing all matter to a single black hole. I assume that this would bend the whole space-time of ...
draks ...'s user avatar
  • 385
4 votes
2 answers
919 views

Black Holes emitting Hawking radiation

I've read that even light cannot escape from black holes. The speed of light is theoretically predicted to be the escape velocity of a black hole. I've also read that the general notion that nothing ...
user748's user avatar
  • 141
17 votes
1 answer
3k views

Has Hawking Radiation Ever Been Observed?

I know Hawking Radiation has firm theoretical footing, but has a signal ever actually been observed? What observational research is being done to attempt to see this effect? Is it simply too tall an ...
astromax's user avatar
  • 5,953
14 votes
1 answer
617 views

Can any information leave a black hole?

Referring to this question, is there any information that can leave black holes? Are they causing a permanent information loss in our Universe?
Aschratt's user avatar
  • 259