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Special & General Relativity

- Dependence of various physical phenomena on relative motion of the observer and the observed objects. Exp. & theo. theories of relativity
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Common Relativity questions, quality answers
T 09:06 AM Greg Bernhardt 
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Jan16-12 Greg Bernhardt
The section of the Usenet Physics FAQ titled "Experimental Basis of Special Relativity" has been cited here many...
Dec31-07 02:06 AM
0 40,485
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Feb23-13 08:40 AM
1 40,832
gravity is about magnetic field...Einstein says that massive objects cause a distortion in space-time, which is felt...
T 07:32 PM
Gazi Kutbay
0 22
I am doing a research about the compact Milne Universe in two dimensions Using special relativity. such that (t,θ)...
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I know that you're going to probably say that a frame of reference doesn't make sense for light, but I've uploaded a...
Feb5-13 09:38 PM
4 107
For another BRS thread, I looked up some information at and was completely sidetracked...
Mar1-10 05:00 PM
Chris Hillman
2 123
Although I can't nominate myself for a Nobel Prize, I was wondering I any distinguished scientist would oppose such a...
Feb12-13 02:55 AM
4 145
Thinking about how so much matter can be squeezed into a singularity, the answer (if I understand correctly) is that...
T 03:43 PM
5 149
I'll try rephrasing my question, as I do not wish to question the theory itself. Verily, verily, it would be...
Feb16-13 04:19 PM
4 161
A general summary of the experiment is that when the light clock is stationary on the platform it runs as normal, up...
T 04:35 PM
3 165
I was wondering why can't I use formulas from the "Special Relativity" in cases like: F=mv^2/r Or F=qvB...
Jul22-14 12:56 AM
2 206
Hello, Some knows how to Bondi deduce his radiating line element? I read some papers and there isn't any hint about...
May4-14 07:21 PM
2 220
Hi, I'm trying to understand why the metric I've seen for AdS space,...
Jan24-14 11:38 AM
0 220
On the spacetime manifold in general relativity, one chooses a basis at a point and express it by the partial...
May17-14 02:59 PM
2 221
I am somewhat distracted so this post will not be what it should, given that GAP is one of my interests. For those...
Mar11-10 05:17 PM
Chris Hillman
1 222
I'm reading an old article published by Kaluza "On the Unity Problem of Physics" where i encounter an expression for...
May15-14 07:58 AM
3 234
would time dilation occur if for example, i was making a hydrogen atom spin with the center of spin the atom? would...
May19-14 03:40 PM
1 234
This is about Hans Ohanian, "Einstein's E = mc2 mistakes," , a historical paper that...
Jan23-14 06:03 PM
0 235
In my book it says that the Lorentz group O(3,1) includes 'discrete reversals of the time direction'. What on earth...
May18-14 10:21 PM
3 241
In Bianchi IX, the isometry group is the group that admits the same lie algebra as the lie algebra of SO(3). What...
May16-14 04:34 AM
0 242
1. What exactly is the cosmological constant, what is its value (or how do you derive it if it is something that must...
Jul22-14 09:43 PM
2 244
Hawking said that the horizon area of a black hole never decreases and illustrated that in his Hawking Are Theorem: ...
May17-14 12:22 PM
5 245
Hello, I am working on a project but I stuck at a point. I found that divergence of two objects are equal...
Mar12-14 05:17 AM
0 247
In classical mechanics we can get a nice overview of the dynamics of a system by looking at its position-momentum...
May4-14 03:12 PM
1 248
In classical mechanics we talk about homogeneous and inhomogeneous gravitational fields. Do we do this with...
Feb5-14 09:35 AM
1 248
I read recently that " present only GR theory predicts the required 13 parameters for agreement with critical...
Jun12-14 09:57 AM
1 248
Hi, I think I have several misconceptions about the theoretical framework of black holes, I'm just not sure where my...
Mar9-14 08:04 PM
2 249
I started attending to GR lectures, and there we referred to an intelingent beetle living on a 2D flat space and...
Apr10-14 10:54 AM
0 251
A couple of questions about this paper, which, unfortunately, I can't access in is entirety...
May21-14 12:46 PM
2 253
Due to the diffeomorphism invariance of GR ##(M, g_{ab})## and ##(M, \phi_*g_ab)## represents the same physical...
Jan28-14 08:37 AM
center o bass
0 254
when we use a change of reference
Oct18-13 02:16 PM
1 255
Hey, I read that if a four-vector is 'four-orthogonal' to a time-like four vector then it must be space-like. I showed...
Mar11-14 09:35 AM
1 256
Hi, I am working through Section 5.8 of Sean Carroll's book on GR. Does someone know where I can find the bridging...
May11-14 10:48 PM
1 259
I'm getting pretty lost with how initial data works in general relativity. Assuming the energy momentum tensor is...
Mar7-14 07:34 PM
1 261
Disclaimer: I have no formal education in physics. I watched a TedTalk...
Jan22-14 02:58 PM
1 264
Hey guys, I am working on a computer simulation of our solar system and basically analyzing the affects of the...
Mar1-14 04:18 PM
0 267
Hello! I am interested in knowing the existing relation between the ADM Formalism and the Wheeler-deWitt Equation. ...
Feb11-14 10:16 AM
0 271
if we know the relations between time and distance at the moving frame and stationary frame why can't we derive the...
May3-14 12:09 PM
4 271
I'm blanking on this at the moment, but a quick application of Noether's theorem would imply that, aside from the...
Mar9-14 05:21 AM
Ben Niehoff
1 273
Kevin Brown, in his excellent book "Reflections on Relativity" p. 409, "immediately" integrates 2 geodesic equations:...
Apr9-14 07:35 AM
1 273
In a spatially homogeneous model, spacetime is filled with a one-parameter set of invariant hypersurfaces H(t)....
May20-14 06:03 AM
2 273
If gravitational waves cause fluctuations in space time, than could all gravitational waves, large or small all would...
Jan16-14 03:32 PM
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