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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 40,679
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 40,328
In another thread dextercioby posted the comment I want to address this interesting comment here so as not to divert...
Dec20-04 05:01 AM
pmb_phy
15 2,067
I see there is an "Einstein Conference" in the Canary Islands coming up real soon....
Feb28-05 11:32 AM
Garth
1 2,067
Has any reaserch facility in the world developed a way to create gravity waves, sizable ones? Regards, Nenad
May15-08 08:53 AM
DavidWhitbeck
14 2,066
Why the six generator of the restrict lorentz group are the three rotation's generator(angular momentum) and the three...
Dec8-08 03:14 AM
martyf
3 2,066
It's often said there are no rigid bodies in relativity. Is the notion of "angle" primary or derived in relativity? ...
Dec17-08 06:58 PM
atyy
10 2,066
will the following actions be appropriate g^{\mu\sigma}\frac{dA_{\sigma}}{d\tau}=\frac{dA^{\mu}}{d\tau} Please...
Jun7-11 09:35 AM
bcrowell
24 2,066
Hey all, I am nearly finished a grade 12 physics course, and am loving it, however there is one theory from the...
Jul31-06 05:05 PM
pervect
18 2,065
Hi. I'm trying to work my way through Chris Isham's "Canonical Quantum Gravity and the Problem of Time", gr-qc/921001....
Jun9-07 11:08 PM
coalquay404
3 2,065
I was wondering if I could get some guidance regarding the following question: "A radioactive nucleus, moving in a...
Nov15-03 05:21 PM
Pyrokenesis
15 2,064
Where can I found an expressionfor the shear stress tensor in GR with some explanation about it? Thanks blue
Sep13-05 01:43 PM
blue_sky
4 2,064
In the following article ...
Jul24-11 09:45 PM
bcrowell
9 2,064
I just read a sentence in GRAVITATION by MTW (aka the "Princeton Phonebook") that made me realize a confusion wrt the...
Jun19-10 11:27 AM
Altabeh
16 2,063
I assume this has been done, but I have not seen any papers on it. For example, with the Voyagers travelling at...
Aug31-06 02:44 AM
ZapperZ
5 2,062
There was an old thread but for some reason it is now closed... So I'd have to restate this question: Why does...
Jul10-12 11:10 AM
PAllen
10 2,062
If I understand correctly, an object with mass can't reach the speed of light because at the speed of light it would...
Jul7-12 09:32 PM
PeterDonis
13 2,061
If Einstein's relativity tells us that movement is relative to the observer, and if temperature is determined in the...
Oct20-12 03:09 PM
pervect
18 2,061
I was thinking about relativity after a lecture the other day and I came across something, well, odd. Imagine an...
Nov6-04 04:59 AM
Doc Al
3 2,060
Just find something very interesting.. If the speed of light is constant, at some distance from the black hole...
Aug3-06 10:48 PM
DaveC426913
4 2,060
hi! sorry to tell this but relativity confuse me abit too much. i have tried to read the explanation given in the...
Jun11-07 11:35 PM
Cookie_1993
10 2,060
If earth is moving with the speed of 800 km/s in universe, then do we travel at 1/375 of the speed of light according...
Jan23-13 12:30 PM
arindamsinha
17 2,060
Does time-like curvature of spacetime cause light to bend, for example, around the sun? Or is the gravitational...
Dec7-05 04:59 PM
pervect
3 2,059
I'm curious if space and time need to exist for energy to exist? I've tried looking everywhere to see if someone has...
Jan4-08 12:42 AM
CJames
5 2,059
Is this a paradox? We have a satellite orbiting at a significant amount of the speed of light around the earth. ...
Jan11-11 10:22 PM
Nano-Passion
22 2,059
I sort of understand Einstein's theory of relativity. I'm trying to visualize what the universe would be like if the...
Aug20-11 02:32 AM
pervect
15 2,059
GR allows for the possibility of travel in time by the space-dragging effect of an infinitely long, dense, rotating...
Jul14-05 12:03 PM
pervect
1 2,058
Hi All, I was recently trying to understand the Special Theory of Relativity and my understanding of the resolution...
Jan9-08 04:34 PM
Fredrik
5 2,058
I did some searches, but couldn't find an answer to this on this forum. Since a photon can travel 1 km, 1...
Jun5-13 07:09 PM
Vanadium 50
11 2,058
Is there any properties with the curvature tensors in 3 dimensions? (Maybe between the Ricci tensor and the Ricci...
Apr11-11 08:31 AM
Bill_K
3 2,058
Hello. The Einstein has following definition (in my course): Gμε = Rμε - 1/2Rgμε. But why don't we just: ...
Aug21-13 06:51 PM
nix00
23 2,058
So we have an object falling into a black hole. By its perspective it falls in real time, and by the perspective of...
Nov2-08 09:08 AM
Naty1
10 2,057
I don't know if this is the right place to post this but would a proton falling into a black hole experience tidal...
Jun28-11 07:34 PM
bcrowell
10 2,057
Hi, I was wondering if the stress-energy tensor arose naturally in special relativity in the same way that plain...
Apr11-10 06:41 PM
Rearden
3 2,056
I was listening to a lecture about the expansion of the universe and found myself confused about the light we see from...
May26-12 12:19 PM
Naty1
4 2,056
I hope this paper is appropriate to discuss here, as it demonstrates some interesting, if highly controversial,...
Dec21-06 12:58 PM
Aether
6 2,055
Anyone heard of causal set theory before? Basically, it is a concept that our universe should be viewed solely as set...
May16-09 08:38 PM
cesiumfrog
6 2,055
My thinking is this: We know that two interacting photons will adjust their spins relative to each other. We know...
Jan19-10 02:50 PM
devronious
4 2,055
Hi. The higher the velocity of an object the more energy this object has. Velocity is purely relative. When I move...
Dec28-10 10:30 AM
lightarrow
12 2,055
http://i52.tinypic.com/35jbh2g.jpg Considering the above set-up, we have a platform that rotates with some angular...
Jun3-11 06:58 AM
Mentz114
22 2,055
Let us say we have a very long glass that has a uniform square cross section. Its long axis is aligned with the x...
Mar18-12 05:20 PM
yuiop
18 2,055
I've been trying to put this together in my head for a while and it doesn't come out. For example, if there are more...
Dec16-08 03:35 PM
Pippo
11 2,054

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