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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 42,267
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 41,905
Special relativity tells us that twins age differently if after birth they part, follow different paths through...
Dec13-09 09:34 AM
DrGreg
40 4,005
My query is this. In the twin paradox lets assume that one twin Barbara keeps on moving at a relative speed of "c" ...
Dec13-09 08:54 AM
ucsaint
3 857
Gravitons are still theoretical, of course, but I'm not quite sure how they're supposed to fit into the current...
Dec13-09 03:19 AM
Bussani
5 1,446
In many places (here in forums and on a few documentaries) when talking about relativity, it is often said to consider...
Dec13-09 01:41 AM
PrincePhoenix
3 860
Where can I find the paper of Hilbert's derivation of General Relativity's field equations? I heard it is more elegant...
Dec12-09 02:58 PM
Ich
4 1,736
Hello, I'm new to these forums so I hope this first post is ok. I'm currently reading & (slowly) working my way...
Dec12-09 11:21 AM
yuiop
6 1,767
A person is in a confined cubicle - say 1m x 1m x 1m. Assuming he is not accelerating, he should not be able to tell...
Dec12-09 05:00 AM
HallsofIvy
3 971
This observatory is designed to detect gravitational waves, however, I feel that it won't work. I am sure I am wrong...
Dec12-09 12:51 AM
cesiumfrog
15 2,506
if two objects were accelerating on parallel lines, would it appear to an observer on one object that the distance...
Dec11-09 06:38 PM
tiny-tim
1 875
I'm just getting a taste of computational GR, and I have a question regarding the metric for the single point mass...
Dec11-09 03:03 PM
Nabeshin
1 1,204
Kinda silly question. I would like to know how to pronounce 'Christoffel'. If I were to take a stab at it, I would...
Dec11-09 07:22 AM
George Jones
5 2,000
If \Lambda^{\mu}_{\hspace{3 mm}\nu} = \partial_{\nu}x'^{\mu} = \frac{\partial x^'{\mu}}{\partial x^{\nu}} does...
Dec11-09 04:07 AM
Rasalhague
20 2,581
When two black holes collide, do their singularities merge the instant their event horizons touch? Or is there a lag...
Dec10-09 09:21 PM
atyy
5 1,857
In a space time with metrics : ds^2=f(t)(-dt^2+dx^2+dy^2+dz^2) which is the unit that measures time t? second?,...
Dec10-09 05:27 AM
Matterwave
5 1,255
Assume there is a stationary observer O and a moving observer O' at v in collinear relative motion. When origined...
Dec10-09 01:07 AM
jtbell
592 34,893
I've really been trying to understand the concept of time being relative in special relativity. I keep hearing the...
Dec10-09 01:05 AM
pliu123123
3 936
I do not know the details, but I have read that some theories allow backwards time travel using wormholes. Backwards...
Dec9-09 11:56 PM
Dmitry67
18 2,118
Has anyone here read Brian Cox’s “Why does E=MC2”? Is it any good? Does it explain the twin paradox? My friend read it...
Dec9-09 07:55 PM
thenewmans
0 853
Say our early Universe had a significant fraction of its mass in the form of a uniform dust of plank mass black holes,...
Dec9-09 05:39 PM
Spinnor
4 1,651
My 9 year old son made an interesting observation, and I couldn't explain it. Maybe you can help. He interlocked...
Dec9-09 01:12 PM
Noxide
15 1,899
I'm reading GR on Einstein 1920 words here quoting "Hereupon we introduce a hypothesis: that the influence of the...
Dec9-09 01:04 PM
heldervelez
13 3,211
I read that the Sun will become a red giant and destroy the Earth in about 5 billion years. If this is correct, is...
Dec9-09 09:42 AM
DaveC426913
9 2,449
I've been reading about the possibility of time travel by accelerating one end of the wormhole and then returning it...
Dec9-09 02:04 AM
JesseM
5 2,040
I have a question regarding the conditions "prior" to the Big Bang. I realize tere is no empirical evidence for these...
Dec8-09 04:25 PM
espen180
3 1,498
Or is it just that it can't be observed? This is a question that has been on my mind for some time, so i thought it...
Dec8-09 03:09 PM
matheinste
167 11,787
I mean how would we ever do it in the first place? What rockets or propulsion units would we use?
Dec8-09 09:56 AM
yossell
26 3,116
Would GR apply to a universe without any matter or energy? Would such a universe have time?
Dec7-09 11:05 PM
ensabah6
13 1,575
For equal sized black holes of mass M, what fraction, f, of the energy typically gets lost as gravitational radiation...
Dec7-09 09:08 PM
Spinnor
3 961
I need an equation to find to what extent bodies stretch or compress reaching relativistic speeds. Thank you:)
Dec7-09 06:23 PM
Matterwave
1 793
Okay, I am really interested in relativity, but very ignorant in it also. I already know you would divide regular...
Dec6-09 08:22 PM
bcrowell
4 1,902
I was reading about Eisteins theories and had a question. If light can not escape the gravitational pull of a black...
Dec6-09 03:27 PM
sophiecentaur
51 6,240
Hi everyone, first time poster here... I'm learning General Relativity from some old course notes I got from my...
Dec6-09 02:30 PM
ashmanls9
0 1,313
After some learning on atomic physics, I came with the following question. Proton mass is 1.67262158 × 10E-27...
Dec6-09 04:26 AM
MeChaState
9 7,156
1. As Einstein's theorem says "time slows down at the speed of light", does it mean that if humans travel at speed of...
Dec5-09 04:21 PM
krishnasrikar
2 1,594
I was thinking, if time passage varies with speed would the speed of atoms random movement (temperature) affect time?...
Dec5-09 03:37 PM
russ_watters
2 1,740
can any 1 tell mme the derivation of Einstein's field equations? please
Dec5-09 12:09 PM
heldervelez
18 3,266
What is happening to a ray of light of a certain wavelength that passes through a transparent dielectric medium? Ex:...
Dec4-09 11:56 PM
atyy
1 1,882
I have two questions. first, in Einstein's theory of General Relativity the proof was said to come during a solar...
Dec4-09 11:32 PM
Matterwave
4 1,071
Please i am only in ks3 but i like physics. Please may someone explane the theory of special relitivity to me. Be...
Dec4-09 10:40 PM
koontz
9 1,540
I've been trying to learn GR and I've been back and forth through Schutz's first course book. I think I understand the...
Dec4-09 03:50 PM
westwood
3 968

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