All Questions
25
questions
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121
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Black hole information paradox
I read that it is generally believed that information is preserved in black hole evaporation, and people's views only diverge when it comes to how information is preserved. Is this true?
- 117
1
vote
1
answer
81
views
Don't all objects that collapse have an apparent event horizon and so Hawking radiates?
So say there is an object that is in the form of gas and dust and a core that weighs 10 earths is in the center and there is a sphere of gas around it that weighs 50 Earths, so the final mass is only ...
- 1,534
2
votes
2
answers
150
views
Does Hawking radiation depend of what's inside a black hole?
Or is it entirely based on the existence of an event horizon?
Does the fact that black holes radiate depend on any properties of its interior?
- 476
0
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0
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28
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Why negative energy particles not created near a black hole? [duplicate]
If you take empty space right next to a black hole once in awhile, you will get a positive particle being admitted in the opposite direction of the black hole. In the creation of the photon this ...
1
vote
4
answers
177
views
No hair theorem and Klein-Gordon equation
The no-hair theorem states that we can't detect scalar fields outside a black hole, meaning that the solution for the KG equation is trivial, but in fact, we can solve it (for instance for a ...
- 63
0
votes
2
answers
291
views
Can someone help me understand backreaction?
I was reading a paper on black-hole information loss and it mentioned backreaction. I had never heard the word before so I googled it and was surprised to find no cohesive definition that I could ...
1
vote
1
answer
145
views
Euclidean Black hole diagram
I am trying to understand how the Euclidean "cigar" is built. I understand how and why the time is periodic, as for the radius of the cigar I am confused, it should be constant far from the ...
- 63
23
votes
5
answers
4k
views
Was Stephen Hawking's explanation of Hawking Radiation in "A Brief History of Time" not entirely accurate?
I've been looking into black holes and Hawking radiation recently (just on the surface level) and was reading "A Brief History in Time" by Stephen Hawking to understand the basics of ...
- 339
1
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0
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32
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What would happen if a true vacuum expanded within the event horizon of a black hole? [duplicate]
If a bubble of a false vacuum decaying to a true vacuum state (in one of the fields described by the Standard Model) somehow expanded starting from a point within the event horizon of a black hole, ...
- 111
3
votes
1
answer
166
views
What is the power emitted by a black hole for an observer located near its horizon?
The power emitted by a Schwarzschild black hole via Bekenstein-Hawking radiation is usually given for an observer at spatial infinity.
What is the emitted power for an observer hovering just above its ...
- 727
1
vote
2
answers
128
views
Do the null geodesics of photons emitted by Hawking radiation arise from the event horizon?
It is a well-known explanation of Hawking radiation that it originates from the quantum fluctuations near the horizon. Does it mean that one can look at the photons (part of the radiation) and follow ...
- 669
3
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0
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245
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In Hawking's original Hawking radiation paper, how can we understand where the radiation comes from in the collapsing star spacetime?
In the original Hawking's paper "Particle creation by black holes" he first studies the collapsing star spacetime, and then the quasi-stationary phase of the black hole.
In the collapsing ...
- 357
0
votes
2
answers
139
views
How does the quantum wave function behave within a black hole?
We have recently studied the wave function in physics and I was wondering how this behaves within a black hole, since within a black hole position cannot be determined so surely the wave function ...
- 124
10
votes
2
answers
1k
views
Why can't the information inside a black hole be reconstructed from what's left outside?
In trying to understand the significance of the black hole information paradox: regardless of what happens to information inside a black hole; how come it cannot, in principle, be reconstructed by ...
- 1,153
1
vote
3
answers
157
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Can the energy of a black hole's quantum field escape its event horizon?
From what I've read, Hawking radiation is produced far outside the event horizon. The radiation is produced by the quantum field of the black hole outside the event horizon. As more of these ...
- 151