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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 42,385
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 42,028
This is a followup to another thread I started, on the current status of Newton's theory of gravity as compared with...
Aug30-11 11:46 AM
clisp
3 1,212
A gigantic machine that has let's say another 1000 machines inside of it. We start the primary machine to travel at...
Aug30-11 10:21 AM
ghwellsjr
14 1,838
Can someone provide for a layman a positive definition of space? I am looking for a definition of what space is,...
Aug29-11 11:38 AM
DaleSpam
16 2,451
Hello, in a paper http://www-library.desy.de/preparch/conf/theo-ws/workshop2004/data/Chatillon.pdf . says that. ...
Aug29-11 10:59 AM
WannabeNewton
6 2,789
in einstein train thought experiment, if two bulbs were placed, in the front and rear of a moving train. And a person...
Aug29-11 05:02 AM
Doc Al
13 2,805
Hello I don't undestand what means that the gauss bonnet lagrangian in 4D L = ...
Aug29-11 12:52 AM
alejandrito29
0 885
I only know time dilation in it's basic form and it was explained to me beautifully using mirrors in a spacecraft. The...
Aug28-11 03:55 PM
Janus
2 1,227
What are the causes that led einstein formulate curvature of space-time? what it has to do, if any, with the...
Aug28-11 01:27 PM
Bill_K
1 1,055
Is anyone here familiar with the Vaidya/Lemaitre-Tolman metrics? Wiki claims that they're both used to model radiating...
Aug28-11 12:16 PM
George Jones
9 2,182
I know that Newton's theory of gravity fails to predict certain features of Mercury's orbit in comparison with GR, and...
Aug28-11 08:37 AM
chaszz
4 1,581
I try to determine the speed of muons. In an book I have there's an exercise regarding muons. Given that they half...
Aug28-11 08:32 AM
yuiop
7 1,771
I have never been formally trained in GR, and have a question regarding the basics of how to calculate the energy...
Aug28-11 01:51 AM
K^2
7 1,249
Suppose an experimenter firstly is entirely ignorant of general relativity and non-euclidean space. He finds (say) a...
Aug27-11 02:46 PM
utesfan100
9 2,177
I'm going to attempt to start a beginner GR book since we're covering it in Modern Physics and I've been covering the...
Aug27-11 01:58 PM
Elwin.Martin
2 1,271
Can someone explain why the covariant derivative of g_{\alpha\beta} with respect to x^{\lambda} is always zero? I am...
Aug27-11 01:29 PM
JDoolin
30 2,992
Lets say we have a frame of reference moving at, say, 10% speed of light. In it is a nuclear reactor (fusion or...
Aug27-11 07:29 AM
jtbell
4 2,071
Hi If two events are separated by a time-like interval, then all inertial reference frames will agree on the order of...
Aug27-11 12:58 AM
PeterDonis
1 2,633
Interferometrics Cart http://negrjp.fotoblog.uol.com.br/images/photo20100912153045.jpg Imagine that a cart is...
Aug26-11 10:36 PM
D H
10 2,282
If you were infinitely close to the speed of light, and you attempted to take a picture of yourself, would it work?...
Aug26-11 03:02 PM
DaveC426913
44 4,373
Hi. I can't find a source that shows how to superpose two metrics. For example, superposing Schwarzchild metric ...
Aug26-11 01:01 PM
inottoe
6 1,242
My text explains that free float frames are locally indistinguishable from flat space-time in the sense that in a...
Aug25-11 11:53 AM
Bill_K
2 1,046
What happens to the Schwarzschild metric for an isolated non-rotating body when the horizon radius is inside the body?...
Aug25-11 08:54 AM
George Jones
7 1,948
ok, this is realy bugging me that i cant figure it out and it just agitates me all day long. I've heard explanations...
Aug25-11 04:59 AM
K^2
19 5,151
We've known for a while that the Pioneer anomaly couldn't be gravitational: Iorio, "Does the Neptunian system of...
Aug24-11 11:40 PM
atyy
39 5,853
Hi, I ran this by my friend awhile ago and I'm not sure how to feel about it still... Consider the following: ...
Aug24-11 09:07 PM
robphy
16 1,861
2 space stations are separated by a distance of 10 light years and are at rest wrt each other. I set off from A to B...
Aug24-11 06:36 PM
rede96
2 1,526
I am aware that the following operation: mathbf{M}_{ij} \delta_{ij} produces mathbf{M}_{ii} or...
Aug24-11 07:14 AM
dextercioby
7 2,533
Hi, everyone I'm now reading A Relativist's Toolkit by Eric Poisson. In chapter 3, he say something about...
Aug23-11 05:20 PM
WannabeNewton
9 1,660
I've worked through a common-sense argument1 , 2 showing the time-time component of the Schwarzschild metric g_{tt}...
Aug23-11 01:51 PM
pervect
7 1,845
Let r_{\mu} be a tensor in coordinates x^{c} and R_{b} be a tensor in coordinates X^{c}. Then let r_{\mu} = 0. ...
Aug23-11 07:26 AM
grzz
7 1,181
\partial_u \partial^u Isn't this like a box symbol? How is it written out again? You can write it out in 2...
Aug22-11 04:31 PM
LostConjugate
5 1,228
I have been reading around in general relativity, and see that, for Quantum Field Theory in Curved Spacetime, the...
Aug22-11 12:05 PM
Bill_K
1 1,135
I may have the option my senior year to take a GR class at the graduate level. I was wondering if taking this class...
Aug22-11 07:43 AM
K^2
6 1,341
i constantly feel that newton was right in measuring the relative velocity.einstein makes use of light which has a...
Aug22-11 02:32 AM
harrylin
2 1,030
Some friends and I were out at a pub last night and this question came up. If you were in space and you had two...
Aug22-11 02:06 AM
harrylin
27 3,026
From my internet research I gather that they are very hard to detect but is that because the energy carried by the...
Aug21-11 05:28 PM
mrspeedybob
11 1,804
Hi everyone. So basically I am still struggling to find a description of the derivation of relativistic momentum (via...
Aug21-11 04:38 PM
jimbobian
6 1,551
please let me know what is a significance of lorentz factor,and what will happen if lorentz factor is not multiplied...
Aug21-11 09:00 AM
bodhi
9 2,192
Gou et al., "The Extreme Spin of the Black Hole in Cygnus X-1," http://arxiv.org/abs/1106.3690 Pretty cool. I'd...
Aug21-11 05:34 AM
martinbn
8 2,547
Before I post this, I want to assure everyone that I am not a conspiracy theorist who doubts Einstein or relativity...
Aug20-11 01:21 PM
ghwellsjr
9 2,238

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