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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 40,988
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 40,650
Space-time is supposed to be one unity making time in a way equivalent to spacial dimensions. Of course in the metric...
Oct15-09 02:41 AM
twofish-quant
4 1,667
I know that seems like a stupid question to ask. But I was watching a video on relativity and thought for a moment how...
Jun2-10 10:04 PM
Geigerclick
16 1,667
Is it possible for a black hole to exist in a reference frame and not exist in another? I did some naive calculations...
Jun5-10 01:15 PM
Naty1
8 1,667
I had 1 year ago a little discussion with DaleSpam about the short Lorentz derivation (triangle) if a photon alone...
Apr16-13 06:38 PM
digi99
16 1,667
I am a practicing EE who has used the standard Doppler shift equation for thirty years in radar design; therefore, I...
May15-04 10:18 PM
David
3 1,666
Hi, I was wondering if somebody could tell me in what way the following paragraph is incorrect (if it is). Thanks. ...
Aug20-04 06:04 PM
pervect
12 1,666
I've just been thinking (prolly a bad idea): Lorentzian metrics aren't actually metrics at all are they? Infact...
Nov16-04 02:03 PM
jcsd
5 1,666
Ok, so light is both a wave and a particle. That's fine, I accept that. If a photon is a particle it must therefore...
Jul18-08 11:27 AM
bernhard.rothenstein
5 1,666
ok, if when we look at a planet that is say 100000 light years away, and we can see it emitting light, and that light...
Nov27-11 04:28 PM
ianpr
14 1,666
Hello all, Brand new member here. I am trying to fully understand the different kinds of masses, i.e. rest mass,...
May20-14 04:40 PM
berkeman
29 1,666
I'm having trouble understanding the question below. Conceptually I don't see how there would be a difference in...
Dec18-06 04:19 PM
RandallB
2 1,665
Why has light same velocity when measured from any frame? I know about Maxwell's theoritical deduction (but not...
Dec27-07 10:22 PM
peter0302
2 1,665
I know there have been some frame dragging effect experiments, with the GPB being performed at the moment. Which other...
Feb3-05 03:59 PM
matt.o
8 1,664
how come when nasa speaks of the either the space shuttle or the ISS, they speak as if they have left the effects of...
May12-09 06:00 PM
neh4pres
6 1,664
Does the curvature of spacetime describe gravity or tidal force?
Feb27-09 04:13 AM
A.T.
10 1,664
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 1,664
I have a broader question on this - is mass at all properly defined in GR context, including rest mass or so-called...
Jan6-13 08:27 AM
DaleSpam
12 1,664
What is the approximate fractional difference in time measured between a quartz watch crystal resonating either...
Mar10-07 12:25 PM
Mentz114
3 1,663
Gravitational waves travel at the speed of light. So do they also bend around massive objects? If we had an extremely...
Jan11-09 01:40 AM
granpa
7 1,663
Dear fellow relativiters, I never fully got how to get from the field equations of Einstein's R_{ \mu \nu} -...
Dec27-12 05:48 AM
Madster
12 1,663
Trying to see the logic in deriving length contraction and time dilation using the Lorentz transformations and inverse...
Apr5-14 02:15 PM
ANvH
43 1,663
Hi everybody!!! Is there someone that can help me to prove that \omega^2E-k^2E=-ip_0k\times E+i\omega p\times...
Dec6-08 06:55 PM
zwicky
2 1,662
i am now reading the book by landau 'the classical theory of fields' it seems that to develop the relativity...
Jan26-10 08:38 PM
wdlang
2 1,662
I've been learning about Special Relativity as a hobby for the past couple days and for the most part, I've been able...
Jun10-10 12:31 AM
skycastlefish
5 1,662
What would happen to the spacetime fabric when two super massive blackholes collide. I know that they would orbit each...
Mar28-12 07:07 AM
Vanadium 50
6 1,662
Does an electron in circular earth orbit emit radiation?
Apr19-05 03:38 AM
yogi
4 1,661
Hello, I have a question concerning general relativity. (go easy - I have only knowledge from general consumption...
Jun19-08 03:37 PM
helix_angle
8 1,661
Alice is free-falling towards the event horizon (EH) of a black hole (BH) large enough such that local tidal forces...
Feb14-11 03:17 PM
DrGreg
15 1,661
I found this article: http://www.csa.com/discoveryguides/gravity/overview.php The article says gravity moves at...
Jul25-11 09:17 PM
bcrowell
7 1,661
Hi, I was looking up the formula for this on wikipedia and it said that the frequency shift is: \frac{\sqrt{1 -...
Oct17-13 12:25 PM
PeterDonis
12 1,661
I am having problems with this presentation of the train thought experiment. I actually think it's incorrect, but I'm...
May2-10 11:54 AM
Jerbearrrrrr
2 1,660
i posted this comment earlier today, but in a wrong part of this forum. if the fabric of space is expanding...
Sep13-09 03:52 AM
cary cato
26 1,659
Hi everyone, I'm new and this is my first post here. I'm 37 yo, I'm italian so forgive my english. My question...
Nov8-09 03:32 AM
A.T.
20 1,659
It is well-known that Newtonian's law of gravitation \Phi(\vec{r}) = -\frac{Gm}{|\vec{r} - \vec{a}|} for the...
Jun23-14 07:45 AM
stevendaryl
20 1,659
This may have come up before but I havent seen it and dont know the answer. What if the twins started out in...
Nov16-08 04:05 AM
MeJennifer
3 1,658
Hi all, I have been struggling (really) with this and hope someone can help me out. I would just like to compute...
Jul25-11 02:12 AM
hanson
5 1,657
Please feel free to move this to the correct forum. After doing some reading, I've found that Electromagnetic...
Sep30-12 08:59 AM
Bill_K
6 1,657
Popular Science has been running an article about Sonny White, a prominent engineer at NASA's JSC. White has been...
Apr6-13 06:46 AM
tade
14 1,657
I understand that the speed of light can be slowed down when it passes through different mediums. I also understand...
Dec22-13 08:26 PM
JVNY
24 1,657
I was wandering through the net when I came to know that the Newtonian gravitation suffers discrepancies at some...
Jan29-12 08:11 PM
JPBenowitz
3 1,656

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