All Questions
Tagged with electromagnetic-radiation gravity
57
questions
7
votes
1
answer
747
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=...
- 1,616
0
votes
2
answers
43
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 ...
- 2,255
0
votes
2
answers
124
views
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
104
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 ...
- 2,255
2
votes
2
answers
387
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
229
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
views
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 $A_a$ ...
- 7,592
2
votes
2
answers
189
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 ...
- 1,270
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
2
answers
191
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 ...
- 813
7
votes
2
answers
483
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
2
votes
0
answers
52
views
Are electromagnetic and gravitational waves the only known types of waves that can travel in empty space? [duplicate]
Besides electromagnetic and graviational waves, are there any other waves known to travel through empty space?
- 147
0
votes
1
answer
23
views
Are very massive neutron stars highly streching wavelenghts of their emitted light?
Can be possible that more massive or more denser neutron stars stretch the wavelengths of their emitted EM-waves more than less massive and less denser neutron stars?
- 1,815
2
votes
0
answers
438
views
Paradox of radiation of charged particles in a gravitational field
"Paradox of radiation of charged particles in a gravitational field" - Wikipedia ( Paper by a guy I forget the same of)
On wikipedia (reliable ikr), there is a paradox occuring between ...
- 6,636
11
votes
3
answers
2k
views
Can light cause gravity? [duplicate]
We know the following:
Two masses are attracted to one another, as represented by Newtonian gravity
$F = \frac{GMm}{R^{2}}$
Light is massless and bends in the curvature of space-time which can be ...
- 540
0
votes
3
answers
230
views
Why does Light get caught by Gravity, when both are travelling at the Speed of Light?
Gravitational waves travel at the speed of light waves.
So then, why do light waves get caught by gravitational waves (eg, black holes)?
And if it is about the strength of the photon field, then why ...
- 113
5
votes
2
answers
890
views
Are photons affected by Earth's gravity? [duplicate]
Just wondering if the Earth's gravity affects the photons? We can obviously think about equivalent mass of photons by using de broglie relation and then use it to calculate force of gravitational ...
- 691
4
votes
1
answer
388
views
Is there an Abraham-Lorentz force for Gravity?
The Abraham-Lorentz force in Electromagnetism is the recoil a charge experiences as it accelerates due to own emission of radiation.
The Newtonian theory of gravity is identical to that of ...
- 596
2
votes
1
answer
117
views
Can a free electron accelerating in a gravitational field absorb photons? [duplicate]
An 'free' electron accelerated in an electromagnetic field can both absorb and emit a photon. What about an election accelerating in a gravitational field?
Edit:
Some users have suggested that the ...
0
votes
1
answer
671
views
How does black hole suck light? [duplicate]
I was asked the same by my friend. I said that gravitational attraction also occurs for high energy particles .
My friend said photon is not so very high energy particle which I found on net. He ...
- 1,149
3
votes
6
answers
922
views
Does light’s deflection by a gravitational well vary depending on frequency or other properties of the wave?
I’m curious if the magnitude of the displacement of light by a gravity well is variable to any property of the photons (frequency, polarization, etc).
- 317
-3
votes
1
answer
106
views
Can my theory work for letting the swinging work?
This is my theory, will it stop after few hours? why would it stop? i have on top S to S to repel then i have N S to attract, to produce random force for the swing. Then i have large N N repel to push ...
- 97
0
votes
1
answer
67
views
Photons and Black holes [duplicate]
A black hole is listed as "a region of spacetime exhibiting such strong gravitational effects that nothing—not even particles and electromagnetic radiation such as light—can escape from inside it" One ...
user172320
0
votes
2
answers
179
views
Is the Light REALLY bent?
I've learned that always, the light go straight. The as Einstein's gravitation therory, the light can be bent in bented space-I mean, curved space.
Actullay, I think that if we in the space which ...
- 29
1
vote
1
answer
202
views
Strength of gravitational waves vs. electromagnetic waves
If the recent gravitational wave's energy had reached us as visible light, how bright would it have been? Stackexchange complains about the form and brevity of the question so i add something... if it ...
- 213
5
votes
2
answers
395
views
Light dispersion in gravitational theories
GR predicts no Ricci curvature in vacuum (or at least when we can ignore the cosmological constant). Would theories that violate this lead to observable light dispersion in solar system tests of ...
- 175
3
votes
0
answers
130
views
Consequences of a stable geon
What would be the consequences be of a stable geon? What similiarity, if any, would it have to a naked singularity? What would a stable geon potentially look like, and what would the immediate ...
- 31