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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 42,459
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 42,109
The Schwarzschild Metric has a form: ##ds^2 = Kdt^2 - 1/K dr^2 - r^2dO^2## where: K = 1 - a/r; There is a...
T 05:31 AM
wil
48 886
http://en.wikipedia.org/wiki/Schr%C3%B6dinger's_cat I don't understand, if the radioactive source is put in there...
T 03:25 AM
TheScienceOrca
0 81
I have been thinking for the past couple months on how the expansion of the universe effects the matter and energy...
T 02:58 AM
TheScienceOrca
6 295
Does this solution mean anything ? http://www.physicsforums.com/attachment.php?attachmentid=72126&d=1407958868
T 02:40 AM
neilparker62
10 388
As you may already know, given a time-like congruence describing some extended body with world-tube ##\mu## embedded...
T 12:57 AM
WannabeNewton
52 4,974
I was reading Isaac Asimov's introductory physics text "Understanding Physics". In the chapter on Relativity, he...
Y 09:20 PM
Matterwave
8 244
I was recently trying to test something out with the Riemann tensor. I used only 2 dimensions for simplicity sake. As...
Y 07:00 PM
Matterwave
6 174
Hello everybody. I was recently brainstorming ways to make the Einstein field equations a little easier to solve (as...
Y 04:36 PM
victorneto
4 322
I wondered if anyone had a good online reference on the covariant formulation of Maxwell's macroscopic equations and...
Y 04:30 PM
DaleSpam
10 274
Hi, I'm interested in trying to understand Einstein's field equations, I'm a physics student due to start an...
Y 03:43 PM
victorneto
4 329
From what I've understood, 1) the metric is a bilinear form on a space 2) the metric tensor is basically the same...
Y 02:47 PM
victorneto
7 510
Due to the blogs being removed, I thought it might be worthwhile posting a few in the forums- zQdIjwoi-u4 Time...
Y 02:39 PM
PeterDonis
1 143
Due to the blogs being removed, I thought it might be worthwhile posting a few in the forums- From 'Exploring...
Y 06:59 AM
stevebd1
0 144
Hi, How can null geodesics be defined? Obviously the concept of parallel-transport, of the tangent to the...
Aug30-14 11:27 AM
WannabeNewton
2 213
I was wondering about how to speed up time because I was bored, so I considered rotating my body clockwise (in the...
Aug29-14 09:07 PM
Simon Bridge
10 285
It's well understood that extinction effects must be considered when conducting experiments to measure the velocity of...
Aug29-14 07:06 AM
DaleSpam
14 410
Hello, I was wondering what the exact definition of conformal transformations is. This is a question in the...
Aug29-14 06:55 AM
haushofer
2 195
The subject of Birkhoff's theorem has come up in a number of PF threads, and in the course of researching it for one...
Aug28-14 07:06 PM
PeterDonis
0 203
If you are standing on the earth and you drop a ball, the ball falls to the ground due to the force of gravity acting...
Aug28-14 05:49 PM
my2cts
8 431
This old blog entry is being reposted here for archival purposes because the blog system is being removed. ...
Aug28-14 12:14 PM
robphy
0 178
Can the above logic be applied to Schw. Metric as well? Suppose I have an object moving with a radial velocity...
Aug28-14 09:12 AM
stevendaryl
11 260
... The other night my telescope buddy and I were discussing gravities vs time over a campfire and beverages. I...
Aug28-14 07:51 AM
ghwellsjr
6 249
Hello, I noticed quite a few questions on the Hafele-Keating experiment here, but I believe none that have my exact...
Aug28-14 06:23 AM
A.T.
9 222
Draft re Ricci vs Riemann tensors This one is really just the beginning of a musing. I can't even remember if I...
Aug28-14 02:54 AM
Markus Hanke
1 113
In the Wiki article about the Vaidya metric : http://en.wikipedia.org/wiki/Vaidya_metric there is mention of a...
Aug28-14 02:45 AM
Markus Hanke
4 331
Can you explain please! thank you.
Aug28-14 12:02 AM
Chronos
5 351
Hello, I read in an article that in GR it is possible to use a connection with torsion to model ponctual particle...
Aug27-14 03:48 PM
tom.stoer
6 389
Here is my basic question: Lets say we have a massless charged shell with charge q and radius R. Is there some R...
Aug27-14 01:06 PM
michael879
35 4,831
Hello, I am trying to understand Kaluza Klein theory on the five dimensional unification. It was mentioned over...
Aug27-14 05:47 AM
DaleSpam
1 218
I'm seeing examples where for the person in the train the offset of both lights at the end of the train are not seen...
Aug27-14 04:59 AM
jebii
6 227
hi, I need an explanatory difference between timelike and space like events . examples will do, i know the mathematics...
Aug27-14 01:44 AM
Orodruin
3 173
Hi I am in a debate with some creationists. They are claiming that the speed of light changes in strong...
Aug26-14 03:42 PM
Drakkith
19 687
As far as I have the knowledge of GTR that a mass bends the space time around it.But why does this bend occur?The...
Aug26-14 09:03 AM
Simon Bridge
2 211
The speed of light is constant in all inertial frames of reference Imagine a thought experiment, an observer at...
Aug26-14 08:24 AM
ghwellsjr
4 281
The at rest distance between Betty the astronaut and a flag in open space is 1 unit. If Betty approaches the flag at...
Aug26-14 01:29 AM
ghwellsjr
38 1,326
In the formula for Christoffel symbols: \Gammamij= \frac{1}{2}gmkki/∂xj) + (∂gjk/∂xi) - (∂gij/∂xk) you do sum...
Aug25-14 11:35 PM
Matterwave
2 213
I've found the equations of motion for a charged test particle in the Kerr-Newman geometry from a number of sources. ...
Aug25-14 02:05 PM
michael879
1 392
We know how the curvature of a vector V or a manifold is depicted by the following formula: dx\mudx\nu\nu , ∇\mu]V...
Aug25-14 01:36 PM
stevendaryl
28 989
I know that the example of time dilation and length contraction due to Special Relativity is usually given as the...
Aug25-14 04:37 AM
PhilDSP
5 514
Hi all, I'm trying to derive that t=δ(t'+vx'/c^2) Using x'=δ(x-vt) then substituting for x=δ(x'+vt') I should...
Aug24-14 05:26 PM
Fredrik
7 293

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