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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
Y 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 40,983
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 40,643
The constancy of the speed of ligth is a result of the Maxwell's equations. And the Lorentz transformation is an...
Nov7-06 02:27 AM
Ich
10 2,165
Two observers, A & B, are moving apart at constant velocity V. At distance D, B sends a pulse to A which arrives T...
Jul19-09 09:19 PM
diazona
10 2,165
Hi Consider a space ship at rest in space, this ship is equipped with a bomb connected to two rings. Once the rings...
Oct1-12 11:33 PM
zonde
13 2,165
This is a diversion from the "Interesting energy problem" thread. That thread lost its direction a bit lost due to...
Jul7-11 03:39 PM
Q-reeus
15 2,164
I've read about Schwarzschild and Kerr metric, I confused about the spacelike singularity(occur in non-rotating...
May28-10 05:55 AM
stevebd1
2 2,164
Probably this has an easy answer but I can't see it just now, according to the principle of relativity we shouldn't be...
Jan21-11 10:52 AM
TrickyDicky
20 2,164
I have a question, after reading about black holes. What is the "gravity equation"? Let me explain. If the earth...
Dec25-04 01:38 AM
pervect
3 2,163
Iím an electrical engineer. When explaining gravity in GR terms to my peers, and I get to the part about there being...
Sep20-07 07:35 AM
Mentz114
6 2,163
"The Einstein-Rosen bridge was discovered by Albert Einstein and his colleague Nathan Rosen, who first published the...
Feb1-12 10:12 AM
snoopies622
11 2,163
Is Gravity a Force of Attraction? We are familiar with electromagnetic attraction and we understand how and why it...
Dec18-04 07:11 PM
Nereid
10 2,162
This would make perfect sense if light was instataneous; i.e., if c equals (that's right, equals, not approaching)...
Mar10-05 10:14 PM
dextercioby
7 2,162
i just started studying special theory of relativity and am confused a lot. its first consequence,that is moving...
Sep4-12 02:25 PM
Doc Al
10 2,162
So if I'm a fast object moving in a sphere, in my frame of reference the sphere begins to contract along the direction...
Jan25-10 10:21 AM
Demystifier
13 2,162
According to Einstein, if you could ride a beam of light and look at your surroundings it would seem as if everything...
Aug30-10 03:10 PM
Naty1
25 2,162
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 2,162
If Einstein's theories are correct, specifically about objects approaching the speed of light and their mass...
Nov3-11 07:29 PM
T1987a2T
9 2,162
Muons are formed from cosmic bombardment and they fall towards the Earth. So here's the problem: Muon's have...
Jun17-12 04:14 PM
DrGreg
20 2,162
Hey! I'm trying to understand time dilation in terms of minkowski diagrams. Below I've added a diagram showing the...
Jan19-12 02:44 PM
bobc2
12 2,161
According to Hawking Radiation, a black hole if left alone will eventually evaporate. As the black hole loses mass the...
Mar9-12 10:04 AM
Naty1
5 2,161
I guess it should be an easy question and I'm just missing smth, but I already spent on it much time and didn't get...
Sep26-10 04:17 AM
arkajad
10 2,160
I have been mulling over the idea of the oft-quoted 'prohibition' on particles travelling 'faster than light'. While...
Jul9-12 10:37 AM
Demystifier
16 2,160
I'm working my way through D'Inverno's Understanding GR and have reached Chapter 7 with no real problems. I'm stuck...
Jan16-10 06:01 AM
TerryW
19 2,159
since the first moment I've started studying the theory of relativity i thought that the minkowski metric represents a...
Feb11-10 03:07 PM
A.T.
4 2,159
Hey i was just wondering where Einstein got the idea for his postulates of the speed of light being the same in all...
Jun25-10 07:23 AM
jtbell
11 2,159
Why is that general relativity does not define what space is. It just says when there is a stress-energy tensor in...
Oct14-10 03:25 PM
Garth
15 2,159
A light wave has mass 0, so except his movement in one direction with lightspeed C it can't be moved in an other...
Oct29-11 07:58 AM
digi99
16 2,158
As you may already know, given a time-like congruence describing some extended body with world-tube ##\mu## embedded...
T 04:09 PM
PeterDonis
26 2,158
General relativity says that the gravitational "field" is just the warping of space by mass. I like to think of the...
Oct14-06 10:30 AM
Daverz
4 2,157
I understand that space is curved inwards by the mass of the planet and I understand how curved space could redirect...
Dec29-11 07:46 PM
Padraic
19 2,157
Is there any way in relativity to mathematically compute what the rate difference would be between two identical...
Jun9-12 01:48 PM
arindamsinha
9 2,157
I understand the concept of a spacetime (future) singularity in a BH I understand what is a ring singularity in...
Feb9-09 03:54 AM
stevebd1
7 2,156
I am trying to proove that the following relation: A_{\nu} \partial_{\mu} \partial^{\nu} A^{\mu} = A_{\nu}...
Apr3-11 06:03 AM
LAHLH
9 2,156
How fast does gravity travel, and how do we know this? I know it can't travel faster than light, but it seems it's...
Jun26-11 03:08 PM
danR
15 2,156
Imagine there is a train moving at .9c with a person on the train and an observer on a platform watching the train go...
Oct8-12 04:14 AM
A.T.
20 2,155
Does " What you don't see with your eyes, don't invent with your mouth" does work in special relativity?:rofl:
Oct23-10 05:13 PM
yuiop
5 2,155
I have a quick question about Space & Time. From what I understand Space and Time are interwoven into "Space-Time"- Is...
Nov26-10 11:38 AM
jimharvard
8 2,155
Why is according to relativity the flowing of time an illusion (as Einstein put it)?
Apr17-06 11:58 PM
pervect
17 2,154
One of the most frequently asked questions in the cosmology subforum is about how the radius of the observable...
May24-11 02:10 PM
George Jones
13 2,154
186000 miles long with zero flex or give. You have an observer at both ends. Observer A has a machine strong enough...
Jul17-11 11:10 PM
DaveC426913
19 2,154
Why is it that the relativity of simultaneity isn't used to explain wave/particle duality? RoS requires that...
Jan29-11 03:31 AM
Phrak
8 2,153

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