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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 42,286
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I am doing a research about the compact Milne Universe in two dimensions Using special relativity. such that (t,θ)...
Aug28-13 08:35 AM
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In this source explaining how to derive the Schwarzchild metric, the person came up with an ansatz and worked from...
T 08:31 AM
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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
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For another BRS thread, I looked up some information at and was completely sidetracked...
Mar1-10 05:00 PM
Chris Hillman
2 136
Hi, I'm interested in trying to understand Einstein's field equations, I'm a physics student due to start an...
T 10:31 AM
3 146
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
4 152
Depending on where I go to get a good understanding of the Lorentz transformations, I run into two formulas for time...
T 12:22 AM
2 161
Hi I am in a debate with some creationists. They are claiming that the speed of light changes in strong...
T 10:56 AM
7 167
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
4 169
This expression: \Gammaavc\Gammacab Can someone please show me how to multiply the two Christoffel symbol...
Aug14-14 12:45 PM
1 175
After learning more about relativity, and the vast amount of knowledge that is on this forum, I would like to clear up...
Aug17-14 08:28 PM
2 188
What if Schwatzchild has made the same mistake as Newton? ( 1 - 2MG / c2 r ) dt can be view as a binomial...
T 11:24 AM
5 190
Dear all, I was reading this...
Aug9-14 03:04 PM
2 200
In the Wiki article about the Vaidya metric : there is mention of a...
Aug17-14 07:21 AM
George Jones
3 208
When you have a general coordinate chart on spacetime you have a lot of freedom to pick your coordinates, but you are...
Aug12-14 07:03 PM
1 210
Question the thing in the region of space that cannot be seen from us because they recede faster than the speed of...
Aug19-14 08:08 AM
2 211
when muons are created in the atmosphere and fall to earth the earth clock runs faster. Thus, the "slower" muon clock...
Aug4-14 10:08 PM
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I would appreciate it if some senior member would give me feedback about this result that I have been using in my...
T 07:43 AM
1 215
This may be a stupid question, but have the various gravitational wave observatories around the world been tested by...
Jul31-14 03:42 PM
2 220
I'm looking for proof that Wolfgang Rindler coined the term Event Horizon. I believe that it was Rindler because...
Aug19-14 03:34 AM
3 220
I know that the example of time dilation and length contraction due to Special Relativity is usually given as the...
Aug19-14 05:06 AM
2 221
Hi, On p.4 of "A First Course in General Relativity", Shutz says that we redefine the units of time so that the new...
T 03:20 PM
16 222
From what I know, to get the reverse trace form of the Einstein field equations, you must multiply both sides by gab...
Aug18-14 03:14 PM
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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
1 231
Hi, I'm trying to understand why the metric I've seen for AdS space,...
Jan24-14 11:38 AM
0 232
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
2 233
Recently read about a release from 2006 about an electromagnetic superconductor that generated a small gravity field...
Aug15-14 06:42 PM
2 234
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
2 236
In General Relativity spacetime is described by a metric. The most common one is the Schwarzschild metric, valid at...
Aug16-14 04:39 PM
3 239
This is about Hans Ohanian, "Einstein's E = mc2 mistakes," , a historical paper that...
Jan23-14 06:03 PM
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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
1 245
We know that distant galaxies (which are expanding) are sometimes expanding at rates that do not conform with our...
Aug1-14 08:22 AM
2 250
I've found the equations of motion for a charged test particle in the Kerr-Newman geometry from a number of sources. ...
Aug15-14 01:44 PM
0 250
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
3 251
In classical mechanics we talk about homogeneous and inhomogeneous gravitational fields. Do we do this with...
Feb5-14 09:35 AM
1 252
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
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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
0 256
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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