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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 42,265
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 41,902
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 2,218
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 2,218
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 2,218
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 2,218
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 2,218
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 2,217
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 2,217
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 2,217
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 2,217
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 2,216
I'm taking general relativity and I understand how things work mathematically, but I'm trying to find ways of...
Apr17-12 08:47 PM
PAllen
2 2,216
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 2,216
Hello. The Einstein has following definition (in my course): Gμε = Rμε - 1/2Rgμε. But why don't we just: ...
Aug21-13 06:51 PM
nix00
23 2,216
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 2,215
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 2,215
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 2,215
I am curious if there has been any research in to the elasticity of spacetime in regards to mass. If we consider that...
Oct28-11 10:46 PM
yoron
7 2,215
I thought I read something that said is was only a close approximation. If you did the full treatment you had to make...
Nov19-06 11:27 AM
tehno
7 2,214
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 2,214
Jan31-10 11:37 AM
sylas
20 2,214
I just read a sentence in GRAVITATION by MTW (aka the "Princeton Phonebook") that made me realize a confusion wrt the...
Jun19-10 11:27 AM
Altabeh
16 2,214
How is the earth on a geodesic? Forgive me if this is basic. I had associated the time dilation effect with...
Mar23-06 03:59 PM
robphy
17 2,212
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 2,212
I have been mulling over the idea of the oft-quoted 'prohibition' on particles travelling 'faster than light'. While...
Jul9-12 10:37 AM
Demystifier
16 2,212
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 2,211
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 2,211
How fast does gravity travel, and how do we know this? I know it can't travel faster than light, but it seems it's...
Jun26-11 03:08 PM
danR
15 2,211
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 2,211
I've been trying to figure this one out for a while, I could use a bit of help. I think I'm getting close. If we...
Nov22-04 08:36 AM
pmb_phy
13 2,210
So if I'm a fast object moving in a sphere, in my frame of reference the sphere begins to contract along the direction...
Jan25-10 10:21 AM
Demystifier
13 2,210
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 2,210
Few questions: When approaching c , why does time slow down? When travelling at c and time stops, how does light have...
Jul8-11 10:26 AM
ZealScience
20 2,210
with the increase of a body's velocity to the speed of light (v->c) so does the body's mass increase m->infinity....
Dec19-03 10:35 PM
marcus
9 2,209
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 2,209
what is the meaning of topological black holes? thanks
Jul6-08 02:37 AM
supakorn
2 2,209
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 2,208
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 2,208
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 2,208
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 2,208
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 2,208

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