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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 42,485
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 42,141
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 2,238
would some be able to give me an example that shows some evidence of length contraction? i have looked at the muons...
Oct20-06 10:32 AM
Meir Achuz
14 2,237
You are an observer fixed in absolute space watching clocks pass between two points, A and B, separated by 1km. The...
Feb24-06 08:50 PM
clj4
8 2,237
I was looking into the geodesic equations for the Schwarzschild metric and I noticed a discrepancy between two...
Nov16-08 10:16 PM
derbes
6 2,237
Hello everyone. So naturally, as I'm sure everyone else here does, I believe in the education of the general public....
Mar5-09 08:19 PM
daytripper
10 2,237
The title about says it. Is a body, (frame) free falling in a gravitational field a valid inertial frame as defined...
Aug20-09 02:07 PM
DrGreg
9 2,237
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 2,237
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 2,237
Does the equation for Lorentz contraction stay exactly the same when quantifying the 'mass increase factor' at...
Oct11-05 02:06 PM
Trilairian
12 2,236
Hello Forum, I have been reading a book, the Fabric of the Cosmos, by Brian Greene. It talks about Newton...
Jan23-12 07:35 PM
nitsuj
15 2,236
"any ray of light moves in an 'stationary' system of co-ordinates with the determined velocity c, whether the ray be...
Jul30-05 06:48 PM
paco1955
0 2,235
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 2,235
How many of you over here are familiar with the twin paradox? I am personally quite fascinated with this phenomenon...
Mar29-07 04:32 AM
daniel_i_l
12 2,234
General relativity describes gravity as simply the curvature of space-time. I believe that I read that the effects of...
Aug16-09 03:05 PM
JesseM
15 2,233
The expansion of spacetime stretches and red shifts the wavelength of light. Is the amplitude of the wave stretched as...
Mar28-11 11:10 AM
bcrowell
11 2,233
If you travel at a sufficiently fast speed, then according to relativity, you will age at a slower rate compared to...
Sep28-12 08:24 AM
altergnostic
20 2,233
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 2,232
I thought I would post this question here rather than in the Classical Physics formum because I expect the GR experts...
May18-10 09:21 AM
stevenb
2 2,232
Hi My name is Pete and this is my first post. I'm a few months away from finishing a degree in mathematics. I'm...
Sep4-07 04:43 PM
Petroz
9 2,231
So as I learn general relativity I am finding that it does not appear to address gravity in any way. The entire...
Aug13-10 12:13 PM
JesseM
20 2,231
In "Does the inertia of a body depend upon its energy content?," http://fourmilab.ch/etexts/einstein/E_mc2/www/ ,...
Jul22-12 08:41 PM
Matterwave
4 2,231
I got the general form of a Lorentz transformation in a GR book, {\textbf{x'}} = {\textbf{x}} +...
Jan2-12 08:14 AM
Chestermiller
4 2,231
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 2,230
The formula which accounts for the Doppler shift is derived from the invarainace of the phase of a plane wave. The...
Mar5-09 02:11 AM
bernhard.rothenstein
9 2,230
As I understand it, Einstein's dismissal of the "luminiferous aether" was based on his discovery that there is no...
Feb25-13 10:23 PM
DaleSpam
21 2,230
As the title says, imagine two observers with clocks A and B in space which move at vrel relative to each other. ...
Oct18-12 01:44 AM
Simon Bridge
20 2,229
If speed of light is the upper limit of speed in the universe, how about force? (please refer to example for the...
Sep23-09 04:22 PM
Meir Achuz
8 2,228
"The Einstein-Rosen bridge was discovered by Albert Einstein and his colleague Nathan Rosen, who first published the...
Feb1-12 10:12 AM
snoopies622
11 2,228
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 2,227
I guess it should be an easy question and I'm just missing smth, but I already spent on it much time and didn't get...
Sep26-10 04:17 AM
arkajad
10 2,226
There has been a lot of noise on this forum lately about A. Mayer's so-called "Transverse Gravitational Redshift." It...
Jun12-11 07:19 PM
pervect
12 2,225
The paradox was discussed already in length, but I would like to add a twist. I take for granted, that the thread...
Jul21-09 02:07 AM
Ich
3 2,225
The fact that the relativity of simultaneity causes events to not happen at the same time, dependent on reference...
Apr6-10 05:57 PM
jaketodd
19 2,225
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 2,225
I really find difficult understanding what spacetime diagram does relativity use while defining its notion of space...
Nov13-13 12:44 AM
rushikesh
20 2,225
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 2,224
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 2,224
I was just wondering since I discussed this with some people before, but exactly how likely is it that wormholes in...
Aug7-07 07:24 PM
Cusp
6 2,224
In Misner-Thorne-Wheeler Gravitation, Chapter 4, Page 92, Box 4.1, at section 4, there is a formula for the...
Oct26-09 05:24 PM
gheremond
2 2,224
If Einstein's theories are correct, specifically about objects approaching the speed of light and their mass...
Nov3-11 07:29 PM
T1987a2T
9 2,224

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