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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
0 41,363
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Feb23-13 08:40 AM
1 41,729
Okay because my previous post of similar kind was I guess rather too full of thought experiments and ideas that nobody...
Aug21-13 04:08 PM
Simon Bridge
5 678
Consider some material object, more or less rigid, with two ends, A and B, like A---B It is at rest at a point...
Dec27-07 06:07 PM
5 1,979
I know that there is an equation for an accelerating object that is already a notable fraction of the speed of light...
Nov2-13 12:01 AM
8 903
Difficult to explain this question but i will try, Space is expanding and un gravitationally bound matter is carried...
Feb18-05 10:55 AM
26 3,738
Maybe this should be in the classical physics section, but there is a connection with GR so I'm posting here. I've...
Sep2-08 08:24 PM
15 2,078
I am thinking about train paradox here. The only difference between the passenger and the person waiting at the...
May21-11 11:38 PM
3 1,013
Consider two point charges in space: one positive(+Q) and other negative(-Q), lying on the y-axis and separated by...
Jul4-11 10:02 AM
59 5,949
Does anyone have any references in the literature that talk about interpreting forces as Christoffel symbols? ...
Dec11-11 10:54 PM
10 1,787
To avoid hijacking an existing thread, I wanted to start a new one on how "gravitational forces" are represented in...
Jul29-12 07:39 AM
34 2,359
Let's tie a rope on an object, then we swing the object around in a circle, then we start running forwards while...
Oct27-13 07:07 AM
66 12,124
I was wondering why can't I use formulas from the "Special Relativity" in cases like: F=mv^2/r Or F=qvB...
Jul22-14 12:56 AM
2 611
I am attemting to help my son with a Physics problem, and it has been 20 years since my last Physics class. I would be...
Feb9-04 06:49 PM
0 1,298
In my general relativity class my professor derived the form of the Kruskal-Szekeres form of the Schwarzschild metric...
Oct19-12 02:25 PM
2 1,027
This is a fairly trivial question I think. I'm only asking it here because after some googling I was unable to find...
Aug14-12 07:26 PM
3 886
Considering how the various forms of equivalence principle can lead to ambiguous discussions, I would like to know if...
Jan15-07 10:24 AM
3 1,762
i am read a paper of name: "formalism for an extended object"(in spanish).. a sub manifold of coordinates y^i...
Nov18-09 05:11 PM
2 787
Does anyone have any information on this experiment involving Einstein's prediction of the speed of gravity? Was it...
Feb6-07 07:40 AM
35 3,929
Hello; I know that the formula for density is mass/volume. However, this is only true for rest mass. What about...
Mar17-10 02:44 AM
4 1,341
If a stationary observer throws a rock out in the radial direction in a Schwarzschild geometry, what is the...
Nov28-08 02:21 AM
5 1,202
i have looked on the net for a formula that would give me an idea of how much gravitational energy verses other...
Nov4-03 03:45 PM
6 2,491
I was just wondering if there is a simple formula for determining how much a horizontal light beam deflects in an...
Aug5-12 03:30 PM
5 1,214
what is the formula for the acceleration felt by an accelerating object? I've spent days googling and cant get a...
Sep24-08 05:03 AM
6 1,520
As you know,the formula for doppler effect is: f^{'}=\frac{v-v_{o}}{v-v_{s}}f relativity suggests(at least I...
Nov10-11 10:28 PM
17 2,431
I am trying to understand where the Einstein-Hilbert action comes from. Neglecting a constant multiplier, Wikipedia...
Dec4-09 10:28 AM
15 2,802
this is a question more about the history of the field equations, but did Einstein get his field equations originally...
Jun16-08 06:02 AM
1 1,152
In the 19th century they believed in the absolute motion and the ether, and they were searching for a scientific proof...
Oct3-13 04:56 PM
27 5,393
Chapter 9 on the theory of relativity discusses a thought experiment ( about a...
May4-12 12:37 AM
32 3,343
Hey, i don't know if this is the right spot to post this question, but I was reading "The Universe in a Nutshell" by...
Oct16-04 07:55 PM
9 1,297
I'm looking for a good text on the foundations of GR. Geared towards physicists, but with a focus on the subtleties of...
Jul31-12 02:33 PM
1 574
Hi everyone, I've been reading posts here occasionally, and have been impressed with the amount and quality of...
Oct30-13 09:56 AM
22 1,878
I'm having trouble interpreting the four dimensional version of Gauss' law. In the original version, a vector would be...
Jul9-12 11:28 AM
7 1,784
About momentum-energy vector ,we have : \vec{P}=(\vec{p},i\frac{E}{c}) and four dimentianal wave vector : ...
Aug2-12 02:32 AM
2 476
I attempted to derive a fully expanded expression for the force four vector The four velocity being --> (γ,γv)...
Jul20-12 03:04 PM
2 619
Suppose that some relativistic field has energy density and momentum density. Integrating these, we get the total...
Oct27-07 05:48 PM
32 5,956
Hi, I'm trying to reconcile some general relativity stuff and I'm getting confused on a few topics. Would someone be...
Dec8-11 12:58 AM
13 2,560
Hi, I have just been pondering the problem of electron - positron annihilation into a single photon in the CM...
Oct19-08 12:56 PM
2 3,305
I've been trying to see how relativity shows that the quantity gamma*m*c^2 (total energy) is conserved. I assumed that...
Oct30-04 05:46 AM
25 3,660
What is the simplest way to find out if a physical quantity is the component of a four vector? There are opinions that...
Feb11-09 02:44 AM
3 1,655
Hey I'm reading about relativity and I stumble across statements such as if a four-vector is timelike then it's always...
Jun1-12 12:59 PM
George Jones
8 1,805
Does anyone know where I can find a mathematical proof that the norm of any four-vector is Lorentz invaraint?
May9-04 04:50 PM
1 1,546

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