All Questions
Tagged with particle-physics general-relativity
68
questions
-3
votes
5
answers
411
views
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
6
votes
1
answer
205
views
Spin statistical theorem in curved spacetime
In Wikipedia
https://en.wikipedia.org/wiki/Spin%E2%80%93statistics_theorem?wprov=sfti1
It states that
“The proof requires the following assumptions:
The theory has a Lorentz-invariant Lagrangian.
...
- 341
1
vote
1
answer
85
views
Is the Large Number Hypothesis still a subject worth researching? [closed]
I've done some research on it for an essay competition of the Gravity research Foundation and shared it with other physicists but the response was very dismal in the sense that most physicists didn't ...
9
votes
2
answers
1k
views
Why does gravity need a graviton? [duplicate]
Einstein theorized that gravity is a phenomena manifested by the curvature of spacetime, in effect it IS the curvature of spacetime. If this is so, why do we need a graviton to convey the force of ...
- 115
2
votes
1
answer
314
views
Do we use any other kinds of affine connections in physics apart from the Levi-Civita connection?
When studying General Relativity, I learned that we use the Levi-Civita connection, i.e. torsion-less(or just symmetric) and compatible with the metric(the covariant derivative of the metric is equal ...
- 7,720
1
vote
1
answer
103
views
Apparent analogies between statements from linear algebra and covariant tensor calculus
When using covariant tensors in relativity or particle physics, there are some statements that seem like analogues of statements known from linear algebra. For example, if we have a symmetric real-...
- 121
0
votes
1
answer
49
views
On two different size planets occurs radioactive decay, is the amount of decay the same?
Imagine there is a planet as big as our sun and a earth like planet. On both planets is a box with equal amounts of radioactive polonium. In between the planets is a measure station. After 10 years ...
- 3,348
7
votes
1
answer
307
views
Are there any additional fundamentals of physics in addition to space-time, energy, mass, and charge?
What do you consider the fundamental quantities in physics to be? By fundamentals, I mean quantities that cannot be described by a combination of other quantities. Fundamentals are things that just ...
- 249
2
votes
0
answers
77
views
does an accelerated charge would be slower relative to an neutral particle due to radiating and lose energy ? both in free fall
this part from this article https://en.wikipedia.org/wiki/Paradox_of_a_charge_in_a_gravitational_field
"Putting together these two basic facts of general relativity and electrodynamics, we seem to ...
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. ...
5
votes
1
answer
622
views
Charge without charge and non-traversable wormholes
My question concerns the theory proposed in this classic paper by Misner and Wheeler. In the paper, the authors propose the idea of "charge without charge"--namely, that positive and negative ...
- 2,665
13
votes
2
answers
1k
views
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 ...
- 314
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
0
votes
1
answer
238
views
Does an object traveling near the speed of light create a gravitaional field? [duplicate]
Does a particle traveling near the speed of light create an observable/measureable gravitational field around it? I know most elementary particles travel near the speed of light and have no ...
4
votes
1
answer
184
views
If the effects of gravity cannot travel faster than the "c", does this mean we are only gravitationally bound by masses in our observable universe?
I'm 17 and fascinated by the differences and omissions Newton made in his equations of motion. However it makes sense that gravity can't travel faster than light because of the force-carrying photons.....
- 379