All Questions
Tagged with particle-physics general-relativity
19
questions
11
votes
4
answers
3k
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What is the difference between a black hole and a point particle?
Theoretically, what is the difference between a black hole and a point particle of certain nonzero mass? Of course, the former exists while it's not clear whether the latter exists or not, but both ...
- 2,152
4
votes
3
answers
728
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Can a single particle create a black hole?
Let us suppose a particle with so much energy $ E= h \frac{c}{\lambda} $ so $ \lambda $ is smaller than Planck's length ?
Would it be possible? I mean if the particle has so much energy then its mass ...
- 4,747
4
votes
4
answers
1k
views
Resource Recommendations: General relativity, local tetrads and particle physics
I'm still self-learning general relativity. I have been a huge fan of Andrew Hamilton's amazing lecture notes on GR, black holes and cosmology. He goes through GR in pretty much full tetrad formalism. ...
13
votes
2
answers
1k
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Do photons generate gravitational waves since they affect with their energy the stress tensor? [duplicate]
The gravitational waves are fact. They are produced in a way predicted 100 years before by Einstein. Anything with energy affecting stress tensor of space time produces them. What does it happen with ...
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9
votes
2
answers
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Was the Higgs mass correctly predicted by asymptotic safety of gravity?
This paper was published in Phys Lett B in 2009, and predicted the Higgs mass to be 126 GeV based on the asymptotic safety of gravity. Is this prediction taken seriously by the theory community, or is ...
- 7,398
8
votes
2
answers
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Does the equivalence between inertial and gravitational mass imply anything about the Higgs mechanism?
For example: the role it might play in a theory of quantum gravity (ie causing space-time curvature)?
I realize that inertial mass can result from binding energy alone. Has the equivalence principle ...
- 7,398
1
vote
1
answer
435
views
If a black hole is just warped spacetime, then where is the electric charge?
I've heard Kip Thorne repeatedly state that matter is destroyed when a black hole is created, that all you are left with is distorted spacetime.
"The idea that black holes are made from very ...
- 51
19
votes
5
answers
2k
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Are elementary particles ultimate fate of black holes?
From the "no hair theorem" we know that black holes have only 3 characteristic external observables, mass, electric charge and angular momentum (except the possible exceptions in the higher ...
user1355
5
votes
1
answer
342
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Why did Dirac say that atomic time is different from relativistic time, and that gravity is becoming weaker? What is the relation between the two?
In this gem of an interview in 1982 with Friedrich Hund, Dirac says at 09:17 that there is some theoretical basis and observational evidence that atomic time and distances are different from ...
- 1,421
-3
votes
5
answers
411
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What causes a single photon to divert its trajectory?
If a single photon passes close enough to a star, the gravity will diverts its trajectory. What causes a photon to divert its trajectory as it passes a sharp edge or the boundary of two mediums?
- 4,083
36
votes
7
answers
4k
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Why can’t gravitons distinguish gravity and inertial acceleration?
If gravitons mediate the gravitational force, couldn’t the detection of gravitons by an observer be used to distinguish whether they are experiencing gravitational acceleration vs. inertial ...
- 481
3
votes
2
answers
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Matter and anti-matter collision energy problem
From Beyond Einstein, by Michio Kaku and Jennifer Thompson, Chapter 13, Antimatter :
Dirac, also focused on the fact that Einstein's equation $E=mc^2$ wasn't totally true. (Einstein was aware that ...
- 231
2
votes
2
answers
239
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Does an observer moving in a circle with constant angular velocity in space experience GR gravitational time dilation?
Assuming that there are no other planets or other gravitational sources around the observer in empty space, would the observer's very fast circular motion create GR gravitational or else called ...
- 4,170
2
votes
0
answers
180
views
Spin particles in curved spacetime
On the Lorentz space, particles are axiomatized as unitary projective representations of the Poincaré group (according to Wigner if I recall correctly). It is then possible to specify a (non-charged) ...
- 41
2
votes
1
answer
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Do atoms expand with universe? [duplicate]
Possible Duplicate:
Why space expansion affects matter?
Why does space expansion not expand matter?
As we know, the universe is expanding, galaxies are away from each other. But what about ...
- 483