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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
Mar11-14 10:20 AM bcrowell 
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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
ZapperZ
1 40,732
The section of the Usenet Physics FAQ titled "Experimental Basis of Special Relativity" has been cited here many...
Dec31-07 02:06 AM
jtbell
0 40,379
If T_{ab} = \rho u_a u_b is the stress tensor for dust. How can I show that T^{ab}_{;b} = 0 mean that dustparticles...
Feb17-08 05:28 PM
TheMan112
0 989
I am reading Taylor and Wheeler's Spacetime Physics. I am enjoying it a lot and find it extremely readable but I have...
Feb17-08 05:01 PM
Ed Quanta
0 1,254
Hey folks, Does anyone know how to get the line element on a torus? The ds^2 term. I want to find the metric...
Feb17-08 04:38 PM
robousy
2 2,584
Hello everybody, this is my first post here. I need help with a task in General Relativity. ------- Given we...
Feb17-08 10:19 AM
CompuChip
10 3,032
The idea is that you have a clock at the origin of some frame O. In order to synchronize this clock with 2 other...
Feb17-08 06:28 AM
Doc Al
7 2,238
Good day to you all, I am total amateur so people with high physics degree dont need to waste their time since this...
Feb16-08 04:02 PM
Tachyonie
2 1,400
I was thinking about how one would teach special relativity using a spacetime-geometric approach. I think you would...
Feb16-08 09:12 AM
Fredrik
16 4,294
Well, it's an interesting thought, but one that I can't quite believe, or maybe more I can't understand how, something...
Feb15-08 08:44 PM
RetardedBastard
65 7,566
Re-reading "On the Electrodynamics of Moving Bodies" by A. Einstein from 1905 (English translation I found on the...
Feb15-08 06:23 PM
W.RonG
6 1,751
As we know, Bondi derives the Lorentz transformations (LT) via the radar detection of the space-time coordinates of a...
Feb15-08 03:31 PM
bernhard.rothenstein
7 1,973
i've never been good at putting my thoughts into words...so i was hoping someone could pickup on my theory, maybe even...
Feb15-08 11:43 AM
HallsofIvy
1 1,455
When searching for KK stuff in forums, I see that when g(5) is applied to L(5 R), this effectively splits the equation...
Feb15-08 10:51 AM
MikeL#
13 3,532
Hi im new to understanding the theory of relativity so please excuse me. I can make sense of most of it. The one thing...
Feb14-08 07:55 PM
CaptainQuasar
8 1,640
Imagine a solid chain from the Earth to the moon's surface (which I believe is 1.5 light seconds away). Now Imagine...
Feb14-08 04:00 PM
russ_watters
4 1,314
Does anyone know of any good tutorials for grtensor (for maple) other than the documentation that comes with the...
Feb14-08 12:14 PM
Pacopag
0 4,239
How do you argue that the equation for time dilation derived from studying a light clock can be used in general. For...
Feb14-08 11:32 AM
country boy
3 2,639
Could someone pleases either: a. Justify the notion that the Lorentz interval between two events is independent of...
Feb14-08 06:58 AM
DrGreg
15 3,512
Hello all. I asked this question as a sub-question in another thread where it was perhaps inappropriate. It is very...
Feb13-08 11:12 PM
JesseM
9 1,673
This thread is another extending from the `Schwarzschild Metric` and `Climbing out of a Black Hole`. I hope the...
Feb13-08 10:34 PM
yogi
6 2,011
I ahve always wondered why only the curvature term R_{\mu,\nu} been considered in GR. From differential Geoetry, how...
Feb13-08 04:47 PM
geoffc
2 2,112
The time dilation equation: \Delta t' = \Delta t/\sqrt{1 - v^2/c^2} Now lets consider a tachyon with v = 2c ...
Feb13-08 04:20 PM
DaleSpam
71 27,406
Hi everyone; I'm new to both PF and GR, so please bear with me if I'm not being very clear, or using standard syntax...
Feb13-08 10:05 AM
haushofer
3 2,526
Forgive me if this has been posted before, but looking through a page of search entries I found many topics that were...
Feb12-08 04:44 PM
yuiop
19 2,771
If we impose that under no force or gravitational field Lorentz transform must hold, my question is if the validity of...
Feb12-08 01:04 PM
yuiop
2 1,807
Letís put an observer in a 3-D frame of reference at x=0, y=0, z=0 to observe one of Einsteinís thought-experiments. ...
Feb12-08 06:24 AM
JesseM
3 1,483
Hi, I am new to this forum so I apologise if a similar thread already exists. I am trying to resolve the...
Feb12-08 06:19 AM
Ich
10 4,169
Proof that pressure is invariant on the front and back faces of the moving box. (We are already agreed in another...
Feb11-08 11:40 PM
yuiop
44 5,794
why no one use the Special or General Relativity in QM (Quantum mechanics) ... when QM studies particles that move...
Feb11-08 11:31 AM
Tom Mattson
8 1,900
If it has been determined that time/space is always relative to gravity as observed in several equations (correct me...
Feb11-08 10:03 AM
masudr
11 3,612
Suppose 2 particles are heading towards each other at a speed very close to the speed of light (relative to a...
Feb11-08 05:15 AM
itsjustme
4 1,525
Now, It is has been derived from GR that the pressure within a substance contributes to it's gravity just as it's mass...
Feb10-08 07:17 PM
pervect
16 3,535
why haven't there been any observations of planets or stars or anything near a black hole's event horizon being...
Feb10-08 03:25 PM
mathman
3 1,426
By way of explanation, I am on a learning curve as far as relativity is concerned, but then this might be true for...
Feb10-08 11:12 AM
pervect
4 1,606
How do you get gravitational waves or gravitons out of the EFE? It certainly doesn't look like a wave equation. Are...
Feb9-08 02:16 PM
joelperr
2 1,123
Nothing can be said about an objects speed in space unless it is compared to the motion of another object. 1. Can...
Feb8-08 10:30 PM
JesseM
15 3,285
It occurred to me that, as far as calculating the position or movement of objects a reference frame can be rotational,...
Feb8-08 03:45 PM
CaptainQuasar
3 1,675
S = a stationary one-dimensional coordinate system. The x'-axis of another one-dimensional coordinate system S'...
Feb8-08 12:17 PM
arbol
6 1,866
Why did Einstein chose R_ab - 1/2 g_ab R = k T_ab the Right side is basically saying the mass/energy causes the...
Feb7-08 09:03 PM
Phymath
2 1,834
Since everything in the universe is moving relative to the other, how can one measure an absolute velocity? Therefore,...
Feb7-08 08:07 PM
pervect
14 2,054
Can anyone explain to me how to expand this expression for curl which I find in the GR book I'm reading (by Hobson,...
Feb7-08 04:40 PM
Mentz114
12 2,497

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