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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 42,293
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 41,924
Increase in weight if an object is illuminated Are there experiments which show that the weight of a body, with...
Jan3-12 10:40 PM
climatos
3 1,077
Hey, I'm just curious, MOND (Modified Newtonian Dynamics) seems to have a character of field renormalization...
Jan3-12 03:32 PM
rorix_bw
6 1,050
Is it possible for a particle to exist according to one reference frame and simultaneously not exist according to...
Jan3-12 03:01 PM
pervect
7 1,557
does there exist an angular speed limit, just like we have 'c' in relativistic mechanics? If Yes, How? If No, Why?
Jan3-12 02:48 PM
phydev
3 1,242
how are scientists able to distinguish between photons? Photons are smallest quanta of EM (electromagnetic)...
Jan3-12 03:20 AM
climatos
2 776
When 2 objects A,B are moving wrt to each other (lets say @0.86c)then from frame A if local time is 10 years then time...
Jan3-12 02:18 AM
Snip3r
5 1,621
Hi all, I'm reading Sean Carroll's Space Time and Geometry and haven't figure out how equation 4.64 is derived,...
Jan2-12 03:46 PM
Bill_K
2 1,793
Hey everyone, I am reading a Schaum's Outline on Tensor Calculus and came to something I can't seem to understand. ...
Jan2-12 09:00 AM
atyy
19 4,071
I got the general form of a Lorentz transformation in a GR book, {\textbf{x'}} = {\textbf{x}} +...
Jan2-12 08:14 AM
Chestermiller
4 2,212
Quick question about the EFE's. When writing the einstein tensor G_{\mu\nu}=R_{\mu\nu}-\frac{1}{2}Rg_{\mu\nu}, and...
Jan1-12 06:24 PM
unchained1978
2 943
I know hyberbola in spacetime diagram is that curve-like line below the light cone much like the bottom of a bath tub....
Jan1-12 05:09 PM
PeterDonis
6 1,146
I don't really know much about GR, but I was just wondering about this theoretical question. I am asking this,...
Jan1-12 05:06 PM
DaleSpam
9 1,496
I am curious about time dilation of atomic clock positions on and in the Earth. If you had a long tube going through...
Jan1-12 02:55 PM
pervect
21 1,877
Micro black holes should in principle be observable by emitting Hawking radiation. However, as this takes place...
Jan1-12 08:02 AM
timmdeeg
4 1,153
It is a thought experiment and based on time dilation. It goes like.. consider a cab moving with a speed close to...
Jan1-12 05:08 AM
Nakshatra
27 2,243
I'm sure this question gets brought up a lot, but I can't figure out why this is true. Everywhere I look, people...
Jan1-12 01:42 AM
atyy
9 1,469
Is there any software or program which can plot spacetime diagrams which includes worldlines, hyperbolas, etc. given...
Dec31-11 09:22 PM
bobc2
1 1,402
http://i209.photobucket.com/albums/bb185/BobC_03/Block_Universe_1.jpg...
Dec31-11 09:02 PM
George Jones
85 9,146
I can't manage to understand the quasi-schizofrenic way we should believe that our universe started at a certain time...
Dec31-11 06:22 PM
DaleSpam
94 7,513
Something confused me. It is said that non-relativistic Bohmian Mechanics uses multiple-particle wave functions which...
Dec31-11 06:00 PM
stglyde
0 676
Hello all, Would like to get some feed-back on some questions I had about special/general relativity and a thought...
Dec31-11 04:41 PM
pervect
13 1,306
If in the twin paradox instead of the twin travelling to the distant star lets say he stays and the earth along with...
Dec31-11 08:20 AM
Snip3r
42 2,844
I imagine I have two clocks that are synchronised and are sitting a long way from a large massive body. I hold on to...
Dec31-11 05:28 AM
timmdeeg
8 2,060
Galileo's pendulum could have shown that local time is relative Making experiments with pendulums Galileo...
Dec31-11 02:19 AM
D H
24 2,424
If you happen to have D'Inverno's Introducing Einstein's Relativity, this is on page 187. He has reduced the metric to...
Dec30-11 10:59 PM
PhyPsy
2 1,044
I found out that Proxima Centauri is 4.2 light years away from earth. If someone was on a voyage to this star via...
Dec30-11 11:22 AM
Naty1
5 1,106
Hey all, After reading some fairly elementary texts on special relativity, I understand length contraction and time...
Dec29-11 10:02 PM
DaleSpam
18 3,167
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 2,255
I have a couple questions about relative motion, since I've been reading everywhere that motion is relative... ...
Dec29-11 04:09 PM
DrewD
11 1,614
I am not sure whether GR corresponds to Mach Principle? -I heard that Mach Principle stimulated Einstein to inch...
Dec29-11 03:59 PM
yicong2011
0 903
I'm reading a physics book and in the section on relativity they are using the Einstein summation convention, with...
Dec29-11 01:36 PM
spacelike
3 880
What will happen in the following scenario? I am standing on the earth. Right next to me, a small rocket...
Dec29-11 01:07 PM
ghwellsjr
3 965
Is this correct? There are two clocks on Earth that are synchronized. One clock goes out on a spaceship at .8c. ...
Dec29-11 05:11 AM
ghwellsjr
34 2,993
I have a fairly decent understanding of black holes, but have always had one curiosity that I haven't found a distinct...
Dec28-11 06:32 PM
gatz
7 1,244
I have been reading about 3-spheres and found it was impossible for me to visualize it. I tried visualizing a 4d...
Dec28-11 02:00 PM
genius01
6 2,312
I do believe that somewhere I have read that an electromagnetic field does produce a gravitational field. So,...
Dec28-11 01:35 PM
Monster99d
6 1,516
This question is in regard to special relativity. From my rudimentary understanding, concerning the twin paradox,...
Dec28-11 11:55 AM
ghwellsjr
76 6,196
Consider this scenario involving twins. The twins, A and B, are some unspecified distance apart and are placed...
Dec28-11 07:11 AM
DaleSpam
8 1,403
Hi everyone, Consider two frames: the rest frame that has a stationary point charge and the moving frame which has...
Dec28-11 06:08 AM
Q-reeus
6 1,243
Let's say I had built a machine that is able to slow down time (Travel to the future) by one eighth. If the object...
Dec28-11 06:06 AM
Vanadium 50
1 886

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