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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 37,162
Hello, It's well known that the action for a relativistic point particle is: S=-m\int...
Nov22-10 02:08 AM
2 919
I first pondered this a number of years ago but I've never formally studied physics or known anyone who has, so I've...
Nov22-10 01:29 AM
6 1,408
I'm currently reading DF Lawden's book Introduction to Tensor Calculus, Relativity and Cosmology. He coverss the idea...
Nov21-10 03:54 PM
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i have tried many texts and searched but can't find particular mathematical proof or explanation of how sp.theory led...
Nov21-10 03:04 PM
8 2,515
Hi there, Can anyone point me in the direction of any papers that explicitly derive the equations of motion in f(T)...
Nov21-10 06:13 AM
0 739
Hi. I am learning special Relativity and I am seeing that the answer to the twin paradox involves the Doppler effect,...
Nov21-10 03:06 AM
13 3,093
When a moving observer views a stationary meter stick, it appears contracted. The stationary observer measures it at...
Nov20-10 11:55 PM
40 3,330
I have read some books by brain Greene in whch he discusses the concept of fixed moments in time, never changing, He...
Nov20-10 10:26 PM
1 1,110
Here is Max Born explaining the crash of a train, in which the train is regarded to be at rest: There are two...
Nov20-10 07:11 PM
30 2,565
I was just checking out an article that talked about scientists who were able to slow light to 38 mph. they went on to...
Nov20-10 01:19 PM
4 978
I'd like to know whether the concept of space-time still exists today My physics teacher doesn't like to believe...
Nov20-10 12:26 PM
5 2,875
While listening to "Science Friday" on NPR today, I heard a Swiss physicist explaining that scientists can now produce...
Nov19-10 05:14 PM
8 1,205
I have wondered about when, during collapse, Hawing radiation starts (given that an outside observer never sees the...
Nov19-10 02:43 PM
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Hi, I can't say I've really ever done much relativity but this made me wonder. Imagine we have some frame...
Nov19-10 11:58 AM
1 926
1) Consider that one way light speed is anisotropic. 2) Use the Einstein method to synchronize all the watches by the...
Nov19-10 11:13 AM
50 4,724
Dear SA/Ms: I am seeking feedback from active and inactive SA/Ms regarding both the current and possible future...
Nov19-10 09:28 AM
19 470
Hey there, I'm having a real hard time understanding exactly how to manipulate tensors (let alone know what they...
Nov19-10 08:39 AM
1 1,952
Locally, Fermi normal coordinates are designed to correspond with direct measurement of distances (born rigidity). I...
Nov19-10 04:18 AM
1 736
I thought I'd present some plots for the Fermi-normal coordinates (only in the r-t plane) for someone falling into a...
Nov19-10 03:37 AM
12 2,032
I think it's fairly well known that Einstein made an incorrect prediction in his 1905 paper on special relativity....
Nov18-10 06:49 PM
18 2,444
I will be glad if some one can help me understand When we perturb schwarzschild metric with linear perturbation we...
Nov18-10 12:34 PM
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So if you were to take the twin paradox, but make it so instead of the ship turning around and going to earth, the...
Nov18-10 12:31 AM
8 980
Whenever you read about entangled particles, and how measuring one of them "immediately" changes the other, the...
Nov17-10 05:30 AM
55 5,919
Can someone help me with speed relative to different objects!!! Nearly everything in everything in everyday life is...
Nov17-10 04:44 AM
26 2,040
Ever since I joined this forum, I have been adamant about my belief that one needed to include a consideration of...
Nov16-10 11:48 AM
0 546
Hello everyone , While studying Special Theory of Relativity , I got stucked with a conceptual problem and need a...
Nov16-10 01:06 AM
18 2,262
I've thought about this one a few times in the past and can't wrap my head around it, how can space or rather nothing...
Nov15-10 10:56 PM
30 3,952
I am having difficulty working out one of the steps in Einstein's original SR paper, in the Section entitled "Dynamics...
Nov15-10 09:50 PM
7 1,853
I'm sure someone else must have come up with this (the description in the third paragraph), but I haven't seen it....
Nov15-10 06:40 PM
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Hello everyone...can anyone tell me what is the modified expression for the gravitational potential in GR which takes...
Nov15-10 06:36 PM
2 836
From the equation of time dilation we can deduce a consequence that surprise me . If we know that in our frame system...
Nov15-10 05:50 PM
3 1,081
What is the major difference or differences of Inertial and non-Inertial frame of reference?? Is it only: ...
Nov15-10 01:32 PM
3 4,460
Lets say we manage to build a spaceship 30miles wide and long that is capable of reaching to 99.99% the speed of...
Nov15-10 08:13 AM
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As 2 time pieces are moving relative to each other in a non accelerated reference frame, they will both see the other...
Nov15-10 12:17 AM
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I thought this may be an isolated idea but on doing a search on the web, there seems to be a common interest in the...
Nov14-10 06:40 PM
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1) So let's say we have twin A and twin B. 2) Twin A stays on Earth. 3) Twin B goes on a trip nearly at the speed of...
Nov14-10 02:01 PM
128 7,755
Sergei Winitzki has a very nice copylefted GR book:...
Nov14-10 10:16 AM
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I don't possess enough knowledge of GR to know if this proposal is feasible (or even remotely possible) I would...
Nov14-10 04:44 AM
Jonathan Scott
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I would like to start a brain storming thread, listing all the possible complications that would arise from NOT having...
Nov13-10 07:14 PM
18 1,313
Hello all, I'm new to GR and trying to understand everything in general now... I was looking at pictures like this...
Nov13-10 08:03 AM
Jonathan Scott
18 1,985

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