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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
ZapperZ
1 41,596
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 41,247
I have read a number of threads on acceleration and special relativity, but can't find what I'm looking for. I would...
Feb23-08 02:58 PM
DaleSpam
10 2,089
I have just read the "Read Before Posting" sticky thread and am wondering. Relativity is a difficult theory to...
Feb22-08 12:54 AM
chroot
46 3,907
Is there an invariance relation for angular momentum similar to E^2 = p^2 + m^2 ? How about quantum spin ?
Feb21-08 03:15 PM
pam
1 1,227
Been reading about aberration and two explanations that diverge - classical and relativistic. at speeds much slower...
Feb21-08 03:05 PM
yuiop
5 2,984
there are a few things i don't get when it comes to light moving at c from all frames of reference... i mean it makes...
Feb21-08 10:37 AM
Janus
9 2,122
You have charged dust (pressure = 0, charge density/mass density = given constant). I suppose the total...
Feb21-08 08:10 AM
Ich
1 2,123
Is there any consensus among experimental and/or theoretical physicists about Tom Van Flandern's ideas about gravity...
Feb21-08 06:46 AM
gonegahgah
53 9,543
In other threads the topic of how the proper time of a clock under acceleration has come up a number of times so I...
Feb21-08 01:49 AM
1effect
18 4,317
Hi, as a highschool teacher I am stuck with the following student's question on time dilatation (SR) which could be...
Feb20-08 05:14 AM
yuiop
19 3,746
Just a thought; if indeed electrons transit around the nucleus, shouldn't we see relativistic doppler shifting as...
Feb19-08 02:02 PM
ZapperZ
14 3,129
tattman posted this in a thread and i was curious to know an explanation so i decided to post it in a new thread ...
Feb19-08 01:46 PM
uprootedferre
2 1,117
I have been trying to show that the Einstein ring radius R_e = 2^1/2 to no avail. can someone who knows this show me,...
Feb19-08 06:39 AM
George Jones
1 4,544
Given we have a spherically symmetric gravitational field around a spherically symmetric body of mass M. How can I...
Feb18-08 10:35 AM
TheMan112
4 3,587
First of all, velocity is a relative phenomenon. When we say velocity of an object is s m/s, it is relative to some...
Feb17-08 07:11 PM
nanobug
6 1,844
How do I rewrite Einsteins famous field equation R_{ab} - \frac{1}{2} g_{ab} R = \frac{8 \pi G}{c^4} T_{ab} ...
Feb17-08 05:39 PM
TheMan112
11 2,808
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 1,264
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 2,600
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 3,037
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 2,270
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 1,406
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 4,311
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 7,574
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 1,757
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 1,975
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 1,463
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 3,540
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 1,644
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 1,315
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 4,447
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 2,720
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 3,526
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 2,027
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 2,116
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 27,461
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 2,531
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 2,775
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 1,811
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 1,503

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