All Questions
Tagged with antimatter black-holes
47 questions
1
vote
2
answers
118
views
Are two oppositely charged black holes, matter & antimatter?
Let's say we have 2 identical black holes, except that their charges are opposite in sign.
Can we consider one to be matter, and the other antimatter? After all, I heard that anti-particles are the ...
- 12.9k
1
vote
1
answer
178
views
Are there any black holes made of antimatter? [duplicate]
And what would happen if an antimatter black hole and a matter black hole would collide?
- 21.9k
57
votes
5
answers
9k
views
Why is matter-antimatter asymmetry surprising, if asymmetry can be generated by a random walk in which particles go into black holes?
My understanding is the early universe was a very "hot" (ie energy dense) environment. It was even hot enough for black holes to form from photons.
My second point of understanding is that black ...
rob♦
- 94.2k
1
vote
3
answers
2k
views
What is really a negative energy particle (and why is it different from an anti-particle)?
I have read this question:
What is negative Energy/Exotic Energy?
This does not really give an answer.
Why does a particle (charged) change sign passing the event horizon?
Black holes and positive/...
1
vote
1
answer
79
views
Black hole radiation
Black hole radiation in which particle and antiparticle pairs are separated which ultimately leads to the 'evaporation', but why does the negative particle always enters the black hole? Why do the ...
- 23k
0
votes
1
answer
108
views
Actual physicists: shoot down my hypothesis regarding antimatter, primordial black holes, and the origin of the universe [closed]
Let's get this out of the way up front: I'm no physicist and have no business proposing any of the things I'm about to propose. The likely outcome here is that someone with relevant education can ...
- 22.1k
20
votes
3
answers
7k
views
If electrons were just positrons moving backwards in time, then shouldn't we see them coming out of black holes?
I have read this question (What would happen if I crossed the shell of a hollow black hole?):
In effect, the formerly spacelike direction inwards becomes timelike, and the singularity is in the ...
1
vote
0
answers
51
views
Charged black holes and the matter antimatter imbalance
After the big bang, could it be that lots of charged primordial black holes began to form? Would this make it more likely for oppositely charged particles to fall in, and thus cause the matter/...
- 213k
2
votes
1
answer
304
views
Vacuum fluctuation and negative energy
I was reading this post Black holes and positive/negative-energy particles because I was wondering how Hawking radiation works and why always the anti-particle falls into a black hole, which is nicely ...
- 235k
0
votes
1
answer
153
views
How can Hawking radiation maintain the balance of matter and antimatter?
If hawking radiation simply reduces the mass and emits electromagnetic radiation, how can the balance of matter / antimatter be maintained? Couldn't you use some of that $E = mc^2$ energy you would ...
- 28.7k
1
vote
1
answer
63
views
Could it be that at the big bang equal amounts of matter and antimatter were created, but the antimatter got stuck in black holes? [duplicate]
I recently watched PBS spacetime's video series on the black hole information paradox. Where they first discussed the no hair conjecture and then later also the true destruction of information by ...
- 546
5
votes
3
answers
596
views
If Hawking radiation is true why isn't the entire universe glowing?
It says hawking radiation appears due to a particle and anti-particle pair one of which gets sucked in and other one escapes , these particles are said to appear out of nowhere , appear everywhere in ...
- 254
5
votes
3
answers
2k
views
Could the universe's antimatter be hiding in black holes?
As far as we know almost all the mass in the universe is matter, not antimatter. There are three scenarios:
The universe started off with more matter than antimatter and the small amount of ...
- 1,554
1
vote
1
answer
159
views
Hawking Radiation Inverted [closed]
Regarding Hawking Radiation, if a particle - antiparticle pair forms with the particle within the event horizon, wouldn't the black hole increase in mass and appear to emit an antiparticle? Are the ...
- 16.6k
20
votes
3
answers
3k
views
What happens when a "matter-black-hole" and an "anti-matter-black-hole" collide?
Let's say we have one black hole that formed through the collapse of hydrogen gas and another that formed through the collapse of anti-hydrogen gas. What happens when they collide? Do they (1) ...
- 213k
4
votes
2
answers
386
views
Why aren't black holes antimatter fountains?
As I understand it, nothing can escape a black hole because the only worldlines leading 'out' from the event horizon point backwards in time.
As I understand it, antimatter is time-reversed ordinary ...
- 213k
1
vote
1
answer
246
views
What happens when you dump antimatter onto a naked singularity?
Inspired by this question, what would happen if you dumped antimatter onto a naked singularity? The answers for the previous question suggest that once the antimatter crossed the event horizon, no ...
- 20.7k
10
votes
3
answers
2k
views
What happens if you dump antimatter into a black hole? [duplicate]
Let's say you have a 10 solar mass BH and dump 10 solar masses of antimatter into the BH... What would happen?
Would I have a 20 solar mass BH?
Would the BH explode
Do we even understand what would ...
- 972
1
vote
1
answer
95
views
In an anti-matter universe, would an anti-matter black hole emit anti-matter gamma radiation? [duplicate]
In an anti-matter universe, when an anti-matter black hole is consuming a large anti-matter star, would it emit anti-matter gamma radiation, or would gamma radiation be the same in either a matter or ...
- 52.2k
1
vote
1
answer
167
views
Using Hawking radiation to turn matter into antimatter and vice-versa
I asked this question on the astronomy stack exchange: https://astronomy.stackexchange.com/q/30477 and it was recommended to me that I instead ask it here.
My question is related to the following ...
CommunityBot
- 1
2
votes
2
answers
201
views
How can one of the particles on a pair of virtual particles created by vacuum fluctuations have negative energy? How does it lower black hole mass?
Assuming Stephen Hawking’s 1975 “Particle Creation by Black Holes” :
“One might picture this negative energy flux in the following way. Just outside the event horizon there will be virtual pairs of ...
- 213k
5
votes
1
answer
218
views
How to understand Hawking's interpretation of the quantization of the field?
In Hawking's paper "Particle Creation by Black Holes" he says the following:
The operator $\phi$ can be expressed as $$\phi=\sum_i f_i a_i+\bar{f}_ia_i^\dagger.$$
The solutions $\{f_i\}$ of ...
CommunityBot
- 1
3
votes
1
answer
100
views
Hawking Radiation specific clarification [duplicate]
If virtual particles on the edge of a black hole pop into existence randomly, wouldnt the likelyhood of a antiparticle generating on the inside of the black hole equal to a particle doing the same? So ...
- 213k
9
votes
2
answers
999
views
Why are there negative energy particles inside a black hole?
In quantum field theory in flat spacetime, there are both positive and negative frequency solutions to the classical field equations, but upon quantization we get only positive energy particles. But ...
- 16.6k
1
vote
1
answer
118
views
If the observable universe after inflation was all there was, would this form a black hole?
There have been other similar questions, but none of the answers address this point.
Inflation ends after the first 10^-32 seconds. Our observable
universe was the size of a grain of sand that ...
- 213k
0
votes
2
answers
397
views
How can the antiparticle of Hawking radiation fall into the black hole? [duplicate]
According to the theory, when quantum fluctuations occur near the event horizon, one is absorbed and the other is emitted as hawking radiation
But in order to conserve the energy the fallen particle ...
- 235k
1
vote
1
answer
222
views
Why does Hawking Radiation not add up to zero? [duplicate]
First off: I am not familiar with the details of quantum mechanics or relativity.
My understanding of Hawking radiation is as follows: Pairs of particles and anti-particles can and will spontaneously ...
- 213k
3
votes
1
answer
309
views
Anti-matter black holes radiation
It is generally accepted that black hole emits Hawking radiation.
I wonder if this radiation is different in case of black hole created by collapsing anti-matter.
Consider a thought experiment. At ...
- 213k
1
vote
1
answer
84
views
Creating two universes at the event horizon of a black hole
Using the uncertainty principle involving time and energy, is it possible a universe and anti-matter universe be formed at the event horizon of a supermassive black-hole? If so, could one the anti-...
CommunityBot
- 1
0
votes
1
answer
171
views
Antimatter and annihilation of light and black light
Can we annihilate a photon with an opposite phase? As two photons annihilate to give two antimatter photons (with opposite charge), these photons must have some opposite property. When these opposite ...
- 255
-2
votes
2
answers
351
views
Is it possible that black holes have an anti-matter jet? [closed]
If we can think of the black hole in the center of our galaxy as a group of decaying atoms with neutrinos coming from one side in the jet and anti neutrinos from the other side then would it be ...
CommunityBot
- 1
-1
votes
1
answer
166
views
Matter beyond event horizon
Assuming that antimatter is matter with time arrow reversed, would it be right to say that matter beyond black hole event horizon then would become antimatter because of space and time axes exchanged? ...
1
vote
0
answers
40
views
How is it possible that pair production results in the decrease in a black holes energy? [duplicate]
I learned that pair production near black holes can cause them to loose energy, and eventually stop. But this is because quantum fluctuations cause particle and anti-particle pairs and the anti-...
- 213k
1
vote
0
answers
44
views
What if a black hole of normal matter and a black hole of antimatter collided? [duplicate]
This is a curiosity question. Considering same mass black holes. As nothing can come out of either black hole, would the annihilation result into a black hole of energy? Assuming the two black holes ...
- 4,519
38
votes
3
answers
16k
views
What happens when anti-matter falls into a black hole?
Let's say a black hole of mass $M$ and a very compact lump of anti-matter (not a singularity) also of mass $M$ are traveling toward each other. What does an outside observer see when they meet?
Will ...
CommunityBot
- 1
1
vote
1
answer
108
views
Particle-antiparticle behaviour
I am trying to understand several particle-antiparticle concepts and there are questions that are not answered in any literature:
Hawking's radiation: what happens if classic particle of particle-...
- 4,984
-1
votes
2
answers
111
views
Theoretical relativity of black hole and antimatter [closed]
(Theoretically), can black holes be considered antimatter that just cancels its equivalent mass and goes back to neutral stage? Note: Be kind I am not a physicist
.
3
votes
3
answers
1k
views
Decay of matter
I was watching Stephen Hawking's documentary and in there he explained how he realized why black holes eventually disintegrate:
There are ripples in space, an antiparticle and a particle get ...
CommunityBot
- 1
1
vote
1
answer
269
views
Difference between anti-matter and matter black holes [duplicate]
Laymen question:
Is there any way to determine by observation whether or not a black hole has resulted from the core collapse supernova of a star originally composed of anti-matter versus a star ...
- 25.9k
0
votes
0
answers
58
views
Can antimatter becomes black hole? [duplicate]
I know it seems unlikely to accumulate sufficient amount of antimatter to let it collapse under its own weight to become a black hole(maybe the gravity works differently I don't know) since they will ...
- 13.1k
0
votes
1
answer
408
views
Theory of black holes producing matter or antimatter [closed]
One of my friends gave a theory about the formation of black holes. He said that:
Black holes are formed when an extremely massive star collapses in its
own gravity to produce a particle of ...
- 1,331
1
vote
4
answers
174
views
Is there any evidence that matter and antimatter continuously appear and disappear on the edge of a black hole?
I heard Stephen Hawking got a Nobel prize for this, someone said there was no evidence for it which I find quite strange since he got an award for it.
2
votes
1
answer
182
views
What would happen in a collision of an antimatter singularty and a matter singularity? [duplicate]
Would energy be released if a black hole made out of antimatter and another of matter were to collide?
- 363k
19
votes
5
answers
3k
views
Anti-Matter Black Holes
Assuming for a second that there were a pocket of anti matter somewhere sufficiently large to form all the type of object we can see forming from normal matter - then one of these objects would be a ...
2
votes
1
answer
1k
views
Anti-matter black hole and time
I have recently read some hard science-fiction story based on an assumption that if time stops (from external observer's perspective) on the event horizon of black hole, then in an anti-matter black ...
CommunityBot
- 1
28
votes
3
answers
4k
views
No hair theorem for black holes and the baryon number
The no hair theorem says that a black hole can be characterized by a small number of parameters that are visible from distance - mass, angular momentum and electric charge.
For me it is puzzling why ...
CommunityBot
- 1
10
votes
4
answers
3k
views
If an anti-matter singularity and a normal matter singularity, of equal masses, collided would we (outside the event horizon) see an explosion? [duplicate]
If an anti-matter singularity and a normal matter singularity, of equal masses, collided would we (outside the event horizon) see an explosion?
- 6,665