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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 42,298
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 41,928
Hey, For a problem I am working on I need to know if the energy-momentum tensor of the Reissner- Nordstrom metric...
Feb12-11 09:29 AM
Mentz114
1 1,014
Did this experiment show that there was no ether . Because one way the light had to move up stream and it would take...
Feb11-11 08:05 PM
phyti
229 22,537
Hi all, I've read some references to an example of a person on a train using a flashligt and one outside the train...
Feb11-11 07:19 PM
Fredrik
2 1,271
Why does General Relativity break-down at Plank Temperature?
Feb11-11 12:49 PM
bcrowell
1 1,081
Hello! Is someone aware if there are lecture notes about Lie Groups from a physics course? I would to study an...
Feb11-11 06:57 AM
A. Neumaier
1 841
Hi, It's found it Carroll that r=\frac{L^2}{GM(1+e\cos{((1-\alpha)\phi)}} . He states that this means we've found...
Feb11-11 03:17 AM
LAHLH
2 1,601
Maybe this question has already been asked, anyway, here it goes. The universe is expanding and according to...
Feb10-11 11:50 AM
nicksauce
1 1,307
Howdy! I'm new to Physics Forum and glad to be part of the community. I just finished reading Einstein's Special...
Feb10-11 11:03 AM
Fredrik
14 7,307
Hello This is a part of a simple paper about special relativity http://img15.imageshack.us/img15/8789/91001769.jpg...
Feb9-11 09:41 PM
Dark_knight90
3 864
Lets say I'm in a train going the 1/2 the speed of light. I have a light source that releases signal photons. I...
Feb9-11 04:59 PM
Joseph14
3 953
i am searching for a detailed discussion on the relativistic poisson brackets. where i can found it?
Feb9-11 09:23 AM
A. Neumaier
5 1,362
This is not a homework problem. It is personal project of mine. Pleases help Say you have a space craft that for...
Feb8-11 11:21 PM
JesseM
3 826
So I did a degree some time ago and after watching a programme on TV, I decided to revisit relativity and set myself...
Feb8-11 07:05 PM
DaleSpam
149 13,807
Einstein synchronization, as it is conventionally defined, depends on subtle issues like the one-way speed of light. ...
Feb8-11 05:06 PM
grav-universe
12 1,842
Can a freely floating observer do an experiment that tells him when he is crossing the event horizon?
Feb8-11 10:34 AM
DaleSpam
1 547
Let A and B be two points that are at rest relative to an inertial frame S. Let's say the distance between them is...
Feb8-11 10:32 AM
DaleSpam
1 621
I posted an LHC question a while back but did not get a reply. I'll ask a somewhat different, simplified and more...
Feb7-11 07:37 PM
teve
2 1,679
Hello, I understand light can be accelerated in a gravitational field, because it follows the curves in the...
Feb7-11 07:20 PM
fzero
1 2,047
I was in math class today as we were learning about sine waves and frequency, and i kinda related it to light. Then I...
Feb7-11 05:02 PM
The_Original5
4 998
The argument I've heard following from Special Relativity is as follows: Assume a causal influence can travel...
Feb7-11 10:59 AM
ZikZak
12 2,012
Good Afternoon, After watching a TV program "Into the Universe" "Time Travel " I have some doubts left. I know...
Feb6-11 11:26 PM
NoDoubt
7 2,186
Thus wrote PAM Dirac in his little monograph, "General Theory of Relativity", p.34t. More fully, "Even a light signal...
Feb6-11 06:48 PM
goedelite
4 1,005
Is it fair to say light speed will never be reached because the energy required has been dissipated or used during the...
Feb6-11 01:26 PM
fzero
9 1,343
Hi, I've heard it said that for Schwarzschild spacetimes, then the coordinate 'r' is an affine parameter for radial...
Feb6-11 04:07 AM
LAHLH
8 1,704
will a 2m(rest length) car moving near lightspeed fall in a 1m hole?
Feb5-11 07:33 AM
harrylin
11 2,013
I just wanted to know what exactly is a wormhole.....
Feb4-11 06:33 PM
DaleSpam
1 1,068
Hello! Here and there I find that it is possible to make the Christoffel symbols vanish on a curve (e.g. lecture...
Feb4-11 04:08 PM
bcrowell
8 2,452
hey, does anyone of you know the reissner-nordström metric, if there is a magnetic field instead of the coulomb...
Feb4-11 02:10 PM
Gavroy
4 2,031
Hi! I'm trying to definitely solve the twin paradox (after 5 years of efforts :) ) In every physics textbook, it...
Feb4-11 01:02 PM
PAllen
22 2,481
First of all, I'm not sure where to post this. Now, I am reading some lectures about relativity, I came quite far...
Feb4-11 11:04 AM
Wotso
11 1,145
Given an antisymmetric tensor T^{ab}=-T^{ab} show that T_{ab;c} + T_{ca;b} + T_{bc;a} = 0 If I...
Feb4-11 09:09 AM
Naty1
10 3,186
what is time? and how is space wind to it?
Feb4-11 12:22 AM
nitin_zilch
0 921
Hi, I am learning SR and I need help to get the idea of relativity with two clocks. Yet I can understand that two...
Feb3-11 08:29 PM
JesseM
373 36,078
If the warp drive is shut down either by its destruction or just plain turning it off, what happens? Does the vessel...
Feb3-11 06:28 PM
Nabeshin
4 1,612
Hey, so I have a question. The equivalence principle, the way it has always been taught to me, states that the...
Feb3-11 04:25 PM
DaleSpam
10 1,360
Theory of relativity restricts the speed of causal influences to the speed of light. But is it a proven science fact...
Feb3-11 03:11 PM
Neandethal00
12 1,694
Imagine an electron in uniform motion moving at a speed near the speed of light. Pictures I've seen of the electric...
Feb3-11 01:59 PM
Q-reeus
7 2,510
I have been doing some study on the theory of relativity and it has got me thinking. We say that the Earth revolves...
Feb3-11 07:14 AM
D H
8 2,156
It is well known that the shape of soap bubbles is spherical because of the fact that a sphere is the least-area way...
Feb3-11 01:00 AM
GrayGhost
6 1,006
I have another problem that I am stuck on. Show that a timelike vector cannot be orthogonal to a null vector. ...
Feb2-11 05:05 PM
purakanui
2 3,085

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