All Questions
Tagged with gravity electromagnetic-radiation
18
questions
21
votes
2
answers
2k
views
Gravitational slingshot of light using a black hole/massive object
Wikipedia has this page on gravity assists using planets. In some cases this effect was used to accelerate the spacecraft to a higher velocity. This diagram shows this in a very oversimplified manner. ...
- 4,023
15
votes
3
answers
616
views
Can the question of a gravitationally accelerated charge radiation be tested experimentally?
I know that the question of radiation from a gravitationally accelerated charge has been discussed extensively at Does a charged particle accelerating in a gravitational field radiate?. Yet the ...
- 166
6
votes
4
answers
3k
views
Gravitational lensing or cloud refraction?
My current understanding of gravitational lensing follows
When a star or other massive body passes between us and another star, the phenomenon
generally labeled 'gravitational lensing' occurs. The ...
- 171
3
votes
2
answers
436
views
Do electromagnetic fields gravitate?
It's well known that electromagnetic fields contains energy but do they gravitate?
When we talk about the composition of the universe it's now accepted that the 74% is dark energy, the 22% is dark ...
- 905
2
votes
2
answers
748
views
Does light have mass? [closed]
Does light have mass?
If yes, will it exert force?
If no, then how are light particles are travelling at light speed?
If light doesn't have mass how is it attracted by gravitational force (black holes)...
- 41
9
votes
3
answers
2k
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Why is it hard to detect a black hole
I've read in some texts that we can't directly observe a black hole in space because not even light can escape from its gravity. Some of the indirect observational methods mentioned are, gravitational ...
- 359
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
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
11
votes
3
answers
2k
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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
8
votes
1
answer
373
views
Can light gravitationally affect itself?
Consider a electromagnetic wave in a vacuum. From my understanding of general relativity,
The wave has momentum, and thus generates a gravitational field in all directions.
The gravitational field ...
- 235
5
votes
1
answer
350
views
Is the number of wavelengths of light spanning a distance invariant with respect to spacetime distortion?
I was recently asked by a friend how the expansion of spacetime affects photons. I gave him what I feel is a satisfactory general response, but it got me wondering how, exactly to calculate this ...
- 4,973
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
1
answer
1k
views
Electromagnetic radiation bending on Earth
Most articles say that a radiowave is able to propagate itself beyond the horizon because it is reflected off by the ionosphere (and the Earth itself).
But do radio waves also get bent according to ...
- 133
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
1
vote
1
answer
261
views
Do electrons emit radiation due to gravity [duplicate]
Do electrons accelerating in the presence of a gravitational field radiate due to this acceleration?
- 6,015