All Questions
Tagged with gravity electromagnetic-radiation
58
questions
7
votes
1
answer
739
views
Can gravity radiate?
In electromagnetism, when a charge accelerates, it emits radiation. We know this because we can write the retarded potentials, apply $\vec E=- \nabla V-\frac{\partial \vec{A}}{\partial t}$ and $\vec B=...
- 1,619
0
votes
2
answers
42
views
Stars that have fairly high gravitational redshift and calculation of their surface temperature by Planck emition spectra?
How high can the ratio between gravitational redshift and planck emition spectra be depending on the mass of the star so by how much this gravitational redshift could elongate the Planck spectra of ...
- 2,245
0
votes
2
answers
124
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Does gravity affects electromagnetic waves? Or electromagnetism affects gravity?
I'm confused about the relationship of electromagnetism and gravity, or are they even related?
It has been said the electromagnetic field produces a gravitational field, and so, there is no gravity if ...
0
votes
0
answers
21
views
Charged particles deflected by gravitational and magnetic fields
I am trying to better understand one of my previous questions, and another.
Charged particle in uniform Magnetic field
Does a charged particle orbiting Earth radiate?
https://en.wikipedia.org/wiki/...
- 187
-4
votes
2
answers
102
views
Speed of light affected by gravity or frame dragging effect
If we do not really 100% know how light works as a oscillation we also do not know is its speed indeed constant no matter is there a space or space-time motion that can affect it. Could a device that ...
- 2,245
2
votes
2
answers
382
views
Is there a relation between spacetime curvature and radiation?
To my understanding, the curvature of spacetime is determined by the stress-energy tensor.
I was wondering if we could calculate some of those components using radiation.
Is it possible that objects ...
-3
votes
3
answers
224
views
Why is light not affected by gravity?
If a rocket needs to go to mars, it needs to go through a specific trajectory. But i can see the sun straight where it is, so light does not obey gravity?
- 121
3
votes
1
answer
214
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Deviation of light rays in a scalar gravity theory (simple modification of Nordström theory)
I'm considering a simple scalar theory of gravity in Minkowski spacetime, which isn't exactly the same as the old Nordström theory. The scalar gravity field $\phi$ and the electromagnetic field $A_a$ ...
- 7,572
2
votes
2
answers
188
views
Does the frequency of light have any effect on gravitational lensing? [duplicate]
General relativity considers gravity as the curvature of space-time instead of a force. Therefore, what is bent around an astronomical object is the space-time itself. The light just follows the path ...
- 720
3
votes
1
answer
107
views
Gravitational wavelength shift of microwave background radiation
I can't find this precise question answered. It is basically a two part question.
Would the microwave background radiation, as well as light travelling to us from stars in an expanding universe ...
- 533
0
votes
1
answer
29
views
Red shift for an observer outside the gravitational field
Assuming there are no forces around,consider the situation:
A multi storey laboratory is accelerating in free space, for convenience say vertically. In it a light pulse is generated. The people in ...
- 1,260
15
votes
2
answers
1k
views
Is there a gravitational analogue of a classical Rutherford-atom?
In a Rutherford-atom, the electron classically emits EM radiation on an average rate of,
$$
-\frac{dE}{dt}=\frac {\omega^4 e^2 R_0^2}{3c^3(4π\epsilon_0)}
$$
Where $\omega$ is the angular frequency, $...
- 421
1
vote
0
answers
35
views
Do anti-parallel photons affect each other gravitationally? [duplicate]
We know that two parallel photons have no gravitational effect on each other because they never pass through each other's light cone. The question is, what happens to anti-parallel photons? It ...
- 804
1
vote
2
answers
187
views
Does it take work to bend light?
We all know that light always travels in a straight line. Would it not then stand to reason that changing the path of light requires energy? If so, would this not violate Newton's laws of motion if ...
- 804
7
votes
2
answers
478
views
Do gravitational waves travel always in a straight line (along a geodesic) like EM waves?
There are a lot of questions and answers on this site about light traveling in straight lines in vacuum (following a geodesic). And there are a lot about both EM and gravitational waves traveling at ...
- 29k