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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
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Feb23-13 08:40 AM
1 42,308
The section of the Usenet Physics FAQ titled "Experimental Basis of Special Relativity" has been cited here many...
Dec31-07 02:06 AM
0 41,942
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
5 410
I am using a wikipedia page, Derivation of the Lorentz transformations and a lot of historical papers. To follow...
Mar26-14 07:13 AM
5 380
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
8 456
Hi there, I think I understand how, using Lorentz transformations, I can find relative speeds of objects within...
Mar25-14 12:31 PM
3 361
Two questions, based on the same situation: in ...
Mar25-14 10:27 AM
2 315
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
0 325 This is a video of the 'barking dog' chemistry experiment captured with a...
Mar24-14 06:57 PM
1 286
Reading over Alcubierre's paper on his "warp" drive (, the metric in equation 3...
Mar24-14 11:55 AM
2 442
Greetings, I've been learning about special relativity and most of the learning media included a part of general...
Mar24-14 11:46 AM
3 383
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
10 780
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
92 9,374
Looking at the Einstein equation, stresses can cause a deformation of space time. This link here...
Mar23-14 08:36 AM
Vanadium 50
7 499
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
3 451
Could there be an absolute 'state of reference' somewhere in the universe, perhaps at the location of the original...
Mar22-14 05:56 AM
135 4,135
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
5 414
∇_{\mu}g_{\alpha\beta}=0 is the metricity equation (∇ the covariant derivative). However, I wondered whether also...
Mar21-14 06:52 PM
4 384
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
12 888
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
12 740
The stress energy momentum tensor of the Einstein field equations contains multiple density terms such as the energy...
Mar20-14 07:46 PM
4 421
There are various explanations for Thomas precession in the literature and I would like to come to a deeper...
Mar20-14 05:20 PM
70 3,835
I've been studying the Einstein field equations. I learned that the Ricci curvature tensor was expressed as the...
Mar20-14 02:01 PM
7 596
What is the gravitational binding energy in GR in the spherically symmetric case? I calculate...
Mar20-14 11:36 AM
4 378
Consider two points A and B (Fig.1) at rest in S frame having a distance L0 between them (a long scale may be imagined...
Mar20-14 09:38 AM
11 663
Hi, While reading Sean Carroll's book, I came across the following statement: Okay so this has me confused....
Mar19-14 06:15 PM
2 342
I'll ask that you forgive me if my question seems to "basic" or simple for some of the more professional posters. I...
Mar19-14 03:15 PM
3 435
Hi guys, I'm reading a text regarding different possible ways of synchronizing clocks in an inertial frame, so maybe...
Mar19-14 12:43 PM
7 504
At v = c, time (hence physics) stands still. You can never reach c, but lets say near enough. Therefore if you...
Mar18-14 03:39 PM
15 676
Let's say we have a metro tunnel that is a circular loop with 1 m x 1 m rectangular cross section. The tunnel is 100...
Mar18-14 10:18 AM
3 437
Never mind. Please delete this post
Mar17-14 11:35 PM
1 345
Hello all, In Carroll's on page 109 it is pointed out that for derivation of the geodesic equation, 3.44, a...
Mar17-14 03:37 PM
26 1,223
While Planck time is usually regarded as the shortest unit of time, isn't the shortest unit of time that can exist is...
Mar17-14 01:58 PM
5 515
This paper discusses the Bell spaceship paradox: Petkov, "Accelerating spaceships paradox and physical meaning of...
Mar17-14 12:34 PM
7 512
As I've red, different points on the rotating disk, or rotating object have different velocities and so they should...
Mar17-14 12:13 PM
3 448
I'm trying to understand inflation (in the cosmic sense). I know that ultimately that's a subject that involves both...
Mar17-14 12:11 PM
1 347
I am wondering how big the local coordinate charts in a coordinate atlas of General Relativity can be. Is it just a...
Mar17-14 08:51 AM
3 337
I was wondering since it is usually foliated into 2-spheres and these are not themselves parallelizable(only the...
Mar16-14 03:48 PM
6 501
Let's say we have a long cylinder and two pistons inside the cylinder, and some vapour between the pistons. Now we...
Mar16-14 11:14 AM
24 1,058
I see a number of gravitational wave analytic solutions with the metric given in terms of Rosen coordinates. I have no...
Mar16-14 05:32 AM
5 515
Hi guys, this is my first post, I'm a newbie regarding physics and relativity so I hope you can help me here. I've...
Mar15-14 10:36 PM
41 1,794
Perhaps I am red-shifted, but I just saw a video demonstrating space/time as a loaf of bread and depending on how it...
Mar15-14 11:38 AM
10 680

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