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Mar11-14 10:20 AM bcrowell 

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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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Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Feb23-13 08:40 AM
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The section of the Usenet Physics FAQ titled "Experimental Basis of Special Relativity" has been cited here many...
Dec31-07 02:06 AM
0 37,229
I was hoping someone could help me with a simple physics question I've been mulling over, I've failed to find an...
Apr2-14 06:07 AM
12 538
Hello All, Sorry if my question seems to be elementary. I am trying to find out a little bit details of the Riemann...
Apr2-14 01:13 AM
3 333
Hi everybody, As you know, the Einstein field equation R_{μ\nu} - 1/2Rg_{μ\nu} =κT_{μ\nu} implies that at...
Apr1-14 11:31 PM
10 472
Hello, I have a question, whether is possible to looking for Killing Vectors (KV) in this way (I know about...
Apr1-14 07:26 PM
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Hi, I've heard and read that if someone was to fall towards a black hole, say feet first, they would undergo...
Apr1-14 06:23 PM
7 463
I'm trying to work out: (∇f)^2 (f is just some function, its not really important) While working in curved...
Apr1-14 05:02 AM
7 306
Hi, I've found geodesic equations for the metric: \begin{equation} ds^{2} = -c^{2} \alpha dt^{2} + \frac{1}{...
Mar31-14 10:35 AM
1 282
In an expanding universe that is modeled by the FRW metric we assume that scale factor of the "present epoch" is unity...
Mar30-14 01:33 PM
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Hi All. Layman question. In the twin's paradox, why one of the brothers is older when they meet again?. if movement...
Mar30-14 05:05 AM
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Hey everyone, Recently I have been working on my teaching degree and doing field experience. Because relativity is...
Mar30-14 02:30 AM
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In Padmanabhan's Theoretical Astrophysics by defining a ratio for comparing gravitational potential energy with...
Mar29-14 07:58 PM
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Ok, I have an experiment, well actually it is more of a question than an experiment. I have a very elementary...
Mar29-14 04:09 PM
15 549
I couldn't work out exactly where to post this. I've heard several times that QM and General relativity "contradict"...
Mar29-14 11:22 AM
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So basically, my physics class has begun focusing on SR. And i just wanted to clarify something. I have been...
Mar29-14 02:44 AM
6 391
v=? delta what/which X(distance) over delta what/which T(time)
Mar28-14 10:02 PM
21 1,202
Hello, Im a newguy here, so if my question dont belong to this section, please let me know. My question: In...
Mar28-14 08:21 PM
5 387
Hello, Im looking for some time dependent exact solution of Einsteins eqs. If Im right (if not please correct me)...
Mar28-14 02:52 PM
6 295
I know the reasons why the relativistic mass equation (M= gamma Mo) is out of favour with what seems to be a majority...
Mar27-14 12:58 PM
37 1,207
Can a magnetic field bend space-time?
Mar27-14 01:34 AM
1 337
So the angular diameter distance is given by the angle it extends in the sky and its actual size x d_A=...
Mar26-14 02:38 PM
0 267
In an old (2008) thread, DrGreg posted this transformation from a Minkowski chart to a Rindler chart ...
Mar26-14 02:24 PM
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So I have just been introduced to indices, four vectors and tensors in SR and I'm having trouble knowing exactly what...
Mar26-14 10:24 AM
5 326
I am using a wikipedia page, Derivation of the Lorentz transformations and a lot of historical papers. To follow...
Mar26-14 07:13 AM
5 302
The three main effects of SR occur in inertial frames and change the description of space-time relative to a...
Mar25-14 12:32 PM
8 350
Hi there, I think I understand how, using Lorentz transformations, I can find relative speeds of objects within...
Mar25-14 12:31 PM
3 315
Two questions, based on the same situation: in ...
Mar25-14 10:27 AM
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Hi All Gravitation seems very interesting field to me. One of the most mysterious field of studies, which is having...
Mar25-14 01:40 AM
0 276
Biking at near the speed of light If a biker is going at 0.99c, an observer standing still would notice his...
Mar24-14 07:48 PM
38 936 This is a video of the 'barking dog' chemistry experiment captured with a...
Mar24-14 06:57 PM
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Reading over Alcubierre's paper on his "warp" drive (, the metric in equation 3...
Mar24-14 11:55 AM
2 381
Greetings, I've been learning about special relativity and most of the learning media included a part of general...
Mar24-14 11:46 AM
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I just watched a video that kind of warped my understanding of time dilation. It said that not only would time appear...
Mar24-14 06:33 AM
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This is a puzzle based on a purported "refutation of GR" on this webpage, which is also the subject of a subthread in...
Mar23-14 02:42 PM
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Looking at the Einstein equation, stresses can cause a deformation of space time. This link here...
Mar23-14 08:36 AM
Vanadium 50
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I was just wondering what would the definition of the inertial frame be, since as I've understood the description it...
Mar22-14 11:01 AM
3 363
Could there be an absolute 'state of reference' somewhere in the universe, perhaps at the location of the original...
Mar22-14 05:56 AM
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Since the speed of light is a constant, no matter what location from which a search of the universe is made, matter...
Mar21-14 07:02 PM
5 352
∇_{\mu}g_{\alpha\beta}=0 is the metricity equation (∇ the covariant derivative). However, I wondered whether also...
Mar21-14 06:52 PM
4 306
So I created an account here just so I could ask this burning question. I keep looking online and through other...
Mar21-14 04:07 PM
12 703
I think that is a fundamental question of why we need Tensor when dealing with GR? Quoting from the text book...
Mar21-14 01:17 PM
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