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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
Jul24-14 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
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Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Feb23-13 08:40 AM
1 41,678
I am doing a research about the compact Milne Universe in two dimensions Using special relativity. such that (t,θ)...
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This may be a stupid question, but have the various gravitational wave observatories around the world been tested by...
T 03:42 PM
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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
4 110
For another BRS thread, I looked up some information at and was completely sidetracked...
Mar1-10 05:00 PM
Chris Hillman
2 125
Does the following argument prove that any method of faster than light communication is impossible? 1. A...
T 05:43 PM
8 129
I've read that the Alcubierre Drive depends on the existence of negative mass, but I've seen that physicists say it...
Jul29-14 02:06 AM
Simon Bridge
1 141
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
4 146
Iíve been thinking about Einsteinís gedankenexperiment (because Iím meta like that) regarding the sealed room on...
T 11:52 AM
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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
4 164
It is known that, by the expansion of the universe, galaxies that are roughly 4200 megaparsecs away travel away from...
T 06:19 PM
7 167
I understood that the basic idea of the Michelson-Morley experiment was to measure the velocity of light, as seen from...
Jul29-14 09:01 AM
2 197
Ok so I read this on another site... "the Milky Way is part of the Local Group...The Local Group is calculated to move...
T 01:12 PM
8 212
Hi, I'm trying to understand why the metric I've seen for AdS space,...
Jan24-14 11:38 AM
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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
2 223
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
2 225
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
1 226
This is about Hans Ohanian, "Einstein's E = mc2 mistakes," , a historical paper that...
Jan23-14 06:03 PM
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The basic question was inspired by some other recent threads on the "fabric of space". If we imagine a 2-d spatial...
Jul29-14 05:44 AM
4 236
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
1 239
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
3 242
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
0 243
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
5 246
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
3 247
In classical mechanics we talk about homogeneous and inhomogeneous gravitational fields. Do we do this with...
Feb5-14 09:35 AM
1 248
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
1 249
I read recently that " present only GR theory predicts the required 13 parameters for agreement with critical...
Jun12-14 09:57 AM
1 249
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
0 251
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
2 252
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
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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
1 257
A couple of questions about this paper, which, unfortunately, I can't access in is entirety...
May21-14 12:46 PM
2 258
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
1 261
I'm getting pretty lost with how initial data works in general relativity. Assuming the energy momentum tensor is...
Mar7-14 07:34 PM
1 263
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
1 263
Here is a new video, addressing a common question on this forum: jlTVIMOix3I It's similar to that one, but has...
Jul27-14 04:45 AM
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Disclaimer: I have no formal education in physics. I watched a TedTalk...
Jan22-14 02:58 PM
1 268
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
4 273
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
0 274
Hello! I am interested in knowing the existing relation between the ADM Formalism and the Wheeler-deWitt Equation. ...
Feb11-14 10:16 AM
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