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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 41,693
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 41,336
I am interested in a reason as to why time dilation is not possible. I have done some sloppy google research and have...
Sep22-10 10:20 PM
ritzmax72
23 2,192
1. How would a general relativist explain why an object falls towards the earth? 2. Is it correct to say that it is...
Aug26-07 06:30 PM
pervect
19 2,191
According to GR, how do changes in the mass of an energy density become reflected in its gravitational field? Is...
Apr26-08 12:37 PM
Haelfix
9 2,191
Can someone explain to me why this is the appropriate action?It makes some sens that that would be used, but I'd like...
Apr27-07 07:20 PM
Terilien
4 2,190
Einstein's theory of relativity? In Length contraction and Time dialation, the distance between the two frames is...
Oct16-06 10:36 PM
bernhard.rothenstein
10 2,189
At http://en.wikipedia.org/wiki/Spacetime#Historical_origin I read the following quote: Wouldn't this imply that...
Apr19-07 03:20 PM
MeJennifer
6 2,189
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 2,188
Hi folks Since we often speak of relativistic mass here, and many people here post the URL to the relativity FAQ on...
Jun25-08 08:47 PM
pmb_phy
20 2,188
In http://en.wikipedia.org/wiki/Frame-dragging: In http://en.wikipedia.org/wiki/Gravitomagnetism: Are those...
Nov29-08 03:16 AM
Jonathan Scott
8 2,188
I'm learning about relativity and, by extension, the classic Michelson-Morley setup. I cannot see why a "fringe...
Nov5-09 03:14 PM
JustinLevy
30 2,188
In <Cosmology> written by Weinberg, in page 109, it says that \epsilon=\alpha_{B}T^4+\frac{3}{2}n_{B}Nk_{B}T...
Jul28-11 06:22 PM
bcrowell
18 2,188
A quick question I hope: What would I see from Earth if I sent a rocket to Saturn at nearly the speed of light? ...
Jan22-14 02:42 PM
DaleSpam
64 2,188
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 2,187
Suppose we have two ships A and B in uniform motion according to each other(A claims B to in motion and B claims A to...
Jun20-11 11:45 AM
DaleSpam
13 2,187
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 2,187
An expanding universe is a solution to Einstein's equations. So particles become farther apart with time. I...
Jul11-04 09:18 AM
Mike2
4 2,186
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 2,186
Hi, sorry if this is a frequently asked question. I was reading up on black holes with electric charge and I was...
Nov27-06 09:03 PM
Chris Hillman
3 2,186
I asked this in one of my previous topics, but I just cannot find where I asked it, so here I am asking it again. ...
Dec14-10 11:37 PM
atyy
31 2,186
I've read that it is also a Lie group. But what does that have anything to do with special relativity or different...
Aug15-11 04:33 AM
Phrak
9 2,186
Length contraction happens only in direction of motion. Never perpendicular to the motion. My questions are 1) Why...
Oct10-11 08:16 AM
phinds
5 2,185
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 2,185
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 2,185
Let us say there is a wormhole of the Einstein-Rosen type (maybe physically impossible, I know, but just assume...
Jul27-10 01:54 PM
nickyrtr
12 2,185
Hi all! I am still a GR noob and this example has been puzzling me for a while, so I need some help that's hopfully....
Nov1-10 09:56 PM
Passionflower
22 2,184
what do you mean by "light rod" (acoustic rod?). do tou see a relationship with "wavelenghth"? thanks sine ira et...
Dec6-06 05:42 PM
Chris Hillman
4 2,183
A common concept used in the explanation of the twin paradox is that upon acceleration, one twin sees the other twin's...
Sep18-07 05:42 PM
Xori
7 2,183
I have been trying to self teach General Relativity through Wikipedia, mathematical "experiments," and Google, but no...
Jul7-11 12:48 AM
OniLink++
7 2,181
I got the general form of a Lorentz transformation in a GR book, {\textbf{x'}} = {\textbf{x}} +...
Jan2-12 08:14 AM
Chestermiller
4 2,181
I was reading "Reinventing Gravity - A Physicist Goes Beyond Einstein" by Mr. John Moffat, btw it's a really good book...
Oct2-11 08:39 AM
Naty1
8 2,180
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 2,180
Hi physics people, This is a past (3rd year university level) exam question, so I hope it's ok that I didn't post...
Oct12-11 02:16 PM
*LouLou*
6 2,178
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 2,178
I guess this is more of an anthropological post. Is there any pattern to which sign convention people prefer? Or is it...
Feb26-07 07:14 PM
Ahmes
17 2,177
Im 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 2,177
According to Wikipedia: Objects and radiation can also escape from the ergosphere. In fact the Penrose process...
Nov24-09 03:37 PM
Frame Dragger
6 2,176
Hello, I was wondering how collisions would when both objects are travelling at c. Imagine 2 cars driving towards...
Nov13-11 04:59 PM
Drakkith
20 2,176
I've read in multiple locations that GR is necessary to properly explain a co-rotating perspective/observer of the...
Feb20-06 08:44 PM
clj4
6 2,175
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 2,175
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 2,175

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