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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 41,523
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 41,155
Is there any relationship between the Lie (\pounds) and covariant derivative (\nabla)? Say I have 2 vector fields...
Dec6-11 09:01 AM
nickj1
9 9,805
So, I've never been able to understand where the extra mass comes from when an object is traveling near the speed of...
Dec5-11 08:48 PM
PAllen
19 2,998
Space time Geometry and GR, taken from lecture notes http://www.mth.kcl.ac.uk/courses/cm334.html ...
Dec5-11 12:51 PM
atyy
1 1,522
I have read: F=q(v*B) where q=charge of the particle v=velocity of the charge particle ...
Dec5-11 08:57 AM
jfy4
3 1,295
HI all There is smth I dont understand in building initial data for BH The equations everybody uses uses spacetime...
Dec5-11 08:53 AM
PeterDonis
11 1,877
In another thread here, http://www.physicsforums.com/showthr...=548148&page=3, post #36, Peter Donis posted...
Dec5-11 07:45 AM
Naty1
5 1,222
Ok. I understand that the set of Lorentz boosts and space rotations is equivalent to the set of Lorentz...
Dec5-11 02:02 AM
Fredrik
4 1,826
In a thread a while back, Mentz114 posted a Painleve chart for FRW spacetime; here's the link to the post: ...
Dec4-11 10:31 PM
PeterDonis
7 1,527
Hey, this is my first post of many as I have hundreds of questions! As speed of light is a constant, does it travel...
Dec4-11 06:48 PM
ghwellsjr
14 2,826
There's something called "rest mass" that is the mass of a body in "rest". But since rest is relative it is impossible...
Dec4-11 04:08 PM
jtbell
2 1,558
I (think I) understand that: 1. With the Schwarzschild metric, the ratio of proper time to coordinate time...
Dec4-11 04:01 PM
A.T.
7 1,884
kindly be descriptive
Dec4-11 12:00 PM
rbj
10 10,227
I wanted to understand something about Inertial frames especially as they are talked about in SR. It appears that...
Dec4-11 08:27 AM
atyy
6 1,163
Would it be the rotational speed increasing or the speed at which the Earth revolves around the Sun? I take it in...
Dec3-11 02:27 PM
Passionflower
7 1,772
Hi Everyone. I have just created an animated video on Special and General Relativity, explaining how all the...
Dec3-11 02:12 PM
ghwellsjr
15 2,723
The poincare' group is the group of isometries of Minkowski spacetime, in a nutshell. In terms of an actual physical...
Dec2-11 10:49 PM
matumich26
5 1,806
I'm still struggling with spacetime curvature. I want to know about the spacetime intervals in the following scenario:...
Dec2-11 06:42 PM
gabeeisenstei
2 1,742
I have a question about measuring the speed of light. As I understand it is done by sending photons from A at time t1...
Dec2-11 02:11 PM
ghwellsjr
9 1,494
The 4-velocity of a photon is undefined, so does that mean the velocity of a photon is undefined? What is the...
Dec2-11 01:51 PM
D H
80 5,907
Assume we are on a non rotating planet and shoot a rocket straight with a given velocity (smaller than the escape...
Dec2-11 11:03 AM
Passionflower
4 1,796
If I bend a paper, it doesn't change the things written on it. If gravity is bent space(time), we shouldn't be able...
Dec2-11 04:47 AM
eloheim
19 2,710
How much experimental evidence is there that the speed of light stays c between a source and target moving wrt to...
Dec2-11 02:58 AM
PhilDSP
3 1,339
Hello PF community! I'm having trouble with what strikes me as an inconsistency within conservation of energy,...
Dec1-11 11:28 PM
n+1
4 1,694
SRT = the theory of special relativity I can't find for myself what is wrong with this ? A...
Dec1-11 11:25 PM
digi99
45 6,291
I got confused.. XD "Under Einstein's theory of relativity, an object accelerated close to the speed of light gains...
Dec1-11 11:23 PM
LGram16
4 1,353
Hi! Need some help here. Are the effects of general relativity reciprocal in two reference frames? Let's say for...
Dec1-11 09:48 PM
blueberrynerd
3 1,322
Greetings, I have been trying to teach myself SR and GR and have been going the Bernard Schutz's First Course in...
Dec1-11 07:58 PM
HJ Farnsworth
7 2,140
First of all, a hearty hello to everyone! New poster on this board, though I've been reading this forum quite a bit...
Dec1-11 07:39 AM
clem
2 1,226
hi there............ We say that the speed of light is constant when seen from any frame of refrence because the...
Dec1-11 06:23 AM
A Dhingra
11 1,800
Suppose I construct a metal triangle in flat space the sum of the interior angles will be 180. If I then move the...
Dec1-11 01:23 AM
pervect
2 1,457
A stationary observer sees a moving train going at .6c. Does the moving train see the stationary observer going .6c...
Dec1-11 12:31 AM
ghwellsjr
3 1,346
The faster you travel the slower time travels. But instead could we be thinking in terms of it taking longer for...
Nov30-11 02:05 PM
Matterwave
2 1,551
While gravitational redshift refers to what is seen, gravitational time dilation refers to what is deduced to be...
Nov30-11 12:15 PM
enfield
3 1,889
I read that an objects mass increases as it approaches the speed of light and that this was the reason why anything...
Nov30-11 11:56 AM
DrStupid
8 2,351
So imagine that time is very slow, like 1 meter per second. Yes I know this is impossible, but I'm tired of space...
Nov30-11 08:33 AM
ghwellsjr
21 2,628
Hi everybody! what happens if an electron passes by with a speed of, say, 99.999999999...% of the speed of light...
Nov30-11 07:37 AM
Naty1
59 6,726
I'm familiar with space and time together being 4 dimensions and that mass causes a curvature in this spacetime. ...
Nov30-11 04:33 AM
A.T.
15 2,354
Block Time in relativity where past, present and future exist all the time seems to be in conflict with quantum...
Nov30-11 04:00 AM
stglyde
109 9,318
I have been reading Einsteins Relativity and a simple concept in special relativity is tripping me up. I have heard...
Nov29-11 10:13 PM
ghwellsjr
3 1,167
Are there any exact solutions known for a black hole in a universe which is NOT asymptotically flat?
Nov29-11 09:17 PM
Passionflower
2 1,041

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