All Questions
59
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
3
votes
0
answers
80
views
Why does the wavelength of gravitational waves increase with larger energy?
Gravitational and electromagnetic waves are quite similar, as both are fundamental force waves that travel at the speed of light and have no limit to their range, but when it comes to electromagnetism,...
- 413
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 ...
3
votes
0
answers
82
views
Maxwell's equations in curved spacetime not invariant under metric perturbation gauge transformations
Gauge transformation in general relativity
This post states that
$$h_{\mu\nu} \rightarrow h_{\mu\nu} + \partial_\mu \xi_\nu + \partial_\nu \xi_\mu \tag{1}$$
Is a gauge transformation for a spin-2 ...
- 631
0
votes
0
answers
58
views
The Relation Between Maxwell's Equations and the Equations of Gravitoelectromagnetism
Under certain conditions, it is possible to approximate the effects of the theory of relativity through equations very similar to those of Maxwell, but for gravity. In these equations, our "...
0
votes
0
answers
30
views
Can Electromagnetism affect Gravity? [duplicate]
We know Gravity affects Electromagnetism when we see Black Holes bending the light around them. That makes me wonder if Electromagnetism Can Effect Gravity?
Just like how $E=mc^2$ means energy and ...
- 1
1
vote
1
answer
122
views
Question on asymptotic flatness
What is the theoretical argument for the asymptotical flatness of the four-potential? Can one assume asymptotical flatness for the scalar dilaton field as well?
anon
2
votes
1
answer
144
views
Gravitoelectromagnetism: How far does the analogy go?
In weak gravitaional fields, we can write equations analogous to the Maxwell equations: Gravitoelectromagnetism.
Do the gravitoelectric field and the gravitomagnetic field transform like components ...
- 2,141
2
votes
2
answers
127
views
Mutual gravitational acceleration (or deflection) of light beams as a function of the angle between them
Given Einstein's famous equivalence between energy and mass, $E=mc^2$, a light beam with power, $P$, has an energy per unit length of $P/c$ and an equivalent mass per unit length of $P/c^3$. A short ...
- 2,403
2
votes
0
answers
121
views
How is the gravitoelectromagnetism approximation of GR valid if it seems to yield unstable solutions?
In the gravitoelectromagnetism approximation of GR, we have equations analogous to Maxwell's equations with some sign changes. As pointed out in another post of mine, this leads to unstable run-away ...
- 8,640
4
votes
2
answers
490
views
New "gravity force" analogous to magnetic force?
I was watching Eugene Khutoryansky's physics video about Einstein's Gravito-Electromagnetism, Gravity of moving mass in General Relativity
. In that, he discussed why maxwell's electromagnetism laws ...
- 2,042
4
votes
2
answers
173
views
Theory like general relativity for charges
According to GR, the distribution of mass curves spacetime and the curvature in spacetime then moves all masses in the spacetime in a specified fashion. Is there an analogous theory that says the ...
- 169
0
votes
0
answers
33
views
What is the fundamental difference between a the electromagnetic fields and a gravitational field
I’ve always conceptually thought of a gravitational field and it’s impact on objects and events as an extension to the electromagnetic field, where all matter is charged with the same sign say 0 (...
- 1
2
votes
3
answers
347
views
Can we construct a logically self-consistent relativistic theory of gravity just by tweaking EM?
This question considers a modification of classical E&M where we simply reverse the relative sign in Maxwell's equations and change the "$q$" in the Lorentz force law to an "$m$&...
- 48.4k
0
votes
0
answers
66
views
Is the theory of electromagnetism very incomplete in physical interpretation? [duplicate]
Just like in Newtonian gravity, do we simply accept charge being naturally attracted to the opposite charge with a very similar Newtonian style force? (Coulomb)
Shouldn't there be a meaningful theory ...
