All Questions
Tagged with unruh-effect hawking-radiation
43
questions
0
votes
0
answers
29
views
How to relate the two expressions of thermal spectrum?
I am reading a proof of the fact that if there exists a monochromatic plane electromagnetic wave for an observer in frame $S$, an observer in a frame $S'$, which is uniformly accelerated with respect ...
- 108
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
1
vote
1
answer
60
views
Cosmological horizon and Hawking/Unruh radiation? [closed]
I have two questions about cosmological horizons and their emission of radiation
The first one is:
There are some authors that propose that dark energy or the accelerated expansion of the universe ...
- 2,462
1
vote
2
answers
108
views
Why is Unruh radiation in a full 4$\pi$ solid angle contrary to Hawking's radiation?
I have some trouble asking this question, so I will try a roundabout approach to explain what I mean.
If (outside of Earth atmosphere) one looks at the sun from different distances, the light coming ...
- 4,460
2
votes
1
answer
185
views
Can we infer Hawking radiation assuming the Unruh effect?
An observer near the event horizon of a black hole will experience an extremely strong gravitational field.
Due to the principle of equivalence, this observer cannot locally distinguish between this ...
- 489
6
votes
2
answers
205
views
Will gravitational waves decay into photons? (and by how much?)
We know intense regions of curvature, for example near a black hole horizon, induce a flow of electromagnetic waves (and, less so, other particles). aka Hawking radiation.
By contrast, curvature in ...
user84158
4
votes
1
answer
716
views
Boulware and Unruh vacuum in Schwarzschild spacetime
I am studying quantization in Schwarzschild spacetime. In class the Boulware vacuum $\left| B \right>$ has been defined using the o.n. modes $u_I(x) = \frac{1}{4\pi \sqrt{\omega}}e^{-i\omega v}$, $...
- 626
3
votes
1
answer
112
views
Why is the Unruh effect observer dependent?
Why Unruh radition is observer dependent why Hawking radition is not observer dependent?
I know hawking radiation is caused by the creation of a pair partice and antiparticle in two different sides ...
- 209
3
votes
1
answer
1k
views
How is Hawking radiation formally derived?
[EDITED] I'm a postdoc working in cond-mat/quant theory, and I've heard some explanations of Hawking radiation that strike me as inconsistent or silly (e.g., in terms of pair production). I'm hoping ...
- 873
4
votes
1
answer
521
views
Does String Theory predict things like Unruh effect and Hawking radiation?
I've seen the other post about this, but the answer only discusses Unruh effect rather than String theory.
Hawking radiation and Unruh effect solidify fields as the universe's fundamental objects. ...
- 6,355
6
votes
1
answer
860
views
Might the tiny Hawking radiation from our cosmic event horizon (CEH) be additive, since my CEH is not your CEH?
Concerning our cosmic event horizon, an interesting question arises from the seemingly innocent statement, "My cosmic event horizon is not your cosmic event horizon." Ie: Since 'you' and 'I'...
- 149
0
votes
1
answer
165
views
Unruh effect origin of particle
I have a little confusion about where from the particle are coming in Unruh effect. Vacuum fluctuation is always there and does not depend on whether the frame/detector is moving or not. Vacuum ...
- 534
1
vote
1
answer
87
views
Calculation of expectation of number of particle using Bogolubov transformation [closed]
we have two bases connected by Bogoljubov transformations. In the first basis, creation and annihilation operators are ($a,a^\dagger$) and in the second basis ($a',a'^\dagger$). They are connected by
\...
- 534
0
votes
1
answer
67
views
Proof probability distribution of number of particles seen in different basis connected by Bogoljubov transformation is Poissonian
Let we have two bases connected by Bogoljubov transformations. In the first basis, creation and annihilation operators are ($a,a^\dagger$) and in the second basis ($a',a'^\dagger$). They are connected ...
- 534
1
vote
0
answers
23
views
Significance of non-zero cross energy-momentum tensor in Fulling Davies Unruh effect
In the Fulling Davies Unruh effect We can get the outgoing particle flux from the asymptotic future region $\mathscr{I}^+$ from the mirror trajectory as the following
$$
\mathcal{F}=\int_0^\infty \...
- 534