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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
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 41,884
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Feb23-13 08:40 AM
ZapperZ
1 42,248
I often hear from laymen who study some SR that if sth reaches the speed of light,it completely turns into energy!!!...
Aug20-12 04:09 PM
cosmik debris
2 535
Variation of EH action is: \delta S_{EH}=\int_{\Omega}{\delta(R\sqrt{-g})dx^4}= ...
May19-10 06:36 AM
haushofer
1 996
A and B are twins,A notice B moving away from him with velocity v, so A notice that B is youngerv than him (time...
Nov23-09 09:19 AM
HallsofIvy
3 956
Subject: A Baffling Quote from Einstein, badly requiring explanation All sources I've consulted indicate that...
Mar25-09 10:14 PM
feynmann
59 5,220
I have very little knowledge in general relativity, though I do have a decent understanding of the theory of special...
Mar10-12 08:11 AM
Chestermiller
3 1,190
Hello, It is my understanding that in the case of two observers (A and B) passing each other at high speeds that due...
Feb17-14 03:11 AM
Nugatory
1 310
Dear all, First, please forgive my english, I am French. In most textbooks on general relativity (GR) the non...
Apr18-10 07:16 PM
halcon
3 1,013
If a train goes past an observer at 100km/hour and someone on the train fires a bullet from a gun in the direction the...
Aug22-10 07:45 AM
jtbell
16 1,832
The line element in a rotating plane, with angular velocity \omega is given, in polar coordinates (t, r, \theta) by (...
Apr9-08 02:31 AM
Ich
10 2,468
The laws determinning the passage of light through varying densities of transparent material and through varying...
Aug24-05 05:13 PM
Phobos
6 1,701
If we have Einstein-Hilbert Lagrangian so: \mathcal L = (-g)^{1/2}R for R Ricci scalar (?) then my question...
Jan10-07 02:50 PM
Chris Hillman
1 1,823
I have a doubt regarding the speed of light. What makes it impossible to achieve it. Why cant we have a relative...
Aug1-10 05:39 PM
DaleSpam
12 1,314
If two stars, both slightly above their Schwarzschild radius collide, can a joint horizon form before they come in...
May2-13 09:20 AM
Bill_K
10 1,006
Suppose I dive head first into a black hole of size 100 light second from far away. When I reckon that I will cross...
Nov9-06 11:53 PM
wywong
10 1,417
Hello An old friend of mine just came to me in the early morning and asked about a book on GR and how it manages...
Mar29-10 04:38 PM
Altabeh
0 471
Hello all. First time posting here. I have a basic understanding of special relativity and I have few questions...
Dec20-09 05:01 AM
yuiop
16 3,482
A bus travels at a very high speed. It's time slows down. What's the mechanism by which this happens? Any help...
Sep11-11 06:52 AM
HallsofIvy
4 1,642
Consider a light clock, i.e. two ideal mirrors, mounted in parallel with a vacuum in between, such that, in principle,...
Jan5-11 03:47 PM
birulami
6 1,005
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 2,224
http://i209.photobucket.com/albums/bb185/BobC_03/Block_Universe_1.jpg...
Dec31-11 09:02 PM
George Jones
85 9,131
I push a ball on the ground and it comes to rest after some time. It is a case of motion turning into rest. I...
Jul8-13 02:25 PM
DaleSpam
14 915
There are several measures of distance for a free falling observer in a Schwarzschild solution. I think it would be...
Nov6-11 12:22 PM
Passionflower
0 531
Okay, so the title is overly dramatic, but I couldn't think of anything else to call this. Not trying to actually...
May20-10 11:35 PM
Passionflower
29 2,645
Hello All, in 4-space, the position is x=(x0,x1,x2,x3), where x0=ct The question is - Can one define the clock...
May4-12 03:56 AM
GeorgeDishman
10 1,392
In General Relativity spacetime is described by a metric. The most common one is the Schwarzschild metric, valid at...
Aug16-14 04:39 PM
rlshuler
3 217
If I am understand correctly a moving mass has more energy than a stationary mass. Mass and energy are two forms of...
May3-14 11:44 AM
PeterDonis
4 404
I was wondering what book would be useful in learning special relativity and basic general relativity. I know vector...
Mar19-07 06:12 AM
Demystifier
30 3,721
My textbook says that a compressed spring has more mass than when it is not compressed. I'm assuming that this is...
Mar17-12 02:01 PM
bobsmith76
26 6,185
Over time, I've realized there are certain limits to how far the human imagination can go. Even for simple things, it...
Mar7-08 05:39 PM
Gear300
5 2,862
Can someone explain to me how those who believe relativity also believe that the earth revovles around the sun. I...
May3-09 05:13 PM
Modman
19 2,122
Hey everyone, for anyone who saw my thread in the chemistry section you know I'm changing my view point to that of the...
Jan26-14 05:45 AM
llynne
5 492
In another thread (on Oppenheimer-Snyder collapse), I posted a link to some lecture notes on gravitational collapse....
Nov16-12 06:48 PM
PAllen
0 841
Hi all, I'm in a modern physics course and am surprised by how confused I am about special relativity. I know...
Oct9-12 01:17 AM
ghwellsjr
10 1,192
Suppose two people, each in his own craft, set apart by significant distance and stationary to each other. Both...
May5-13 08:26 AM
Doc Al
1 462
Could it be possible that space-time curvature is not caused by matter but is an inherent characteristic of...
Jun12-11 07:37 AM
Grieverheart
6 628
Mike Fontenot has a scheme he calls CADO for Current Age of a Distant Object. He has presented some of his ideas in...
May3-11 08:30 AM
JesseM
54 4,675
Hi For some days I was looking for the reason that relativity said the speed of light is the maximum speed.At last...
Jun7-09 02:54 PM
DrGreg
28 1,886
This looks interesting: "Symmetry groups are undeniably basic but why must spacetime have a group structure? The...
Jan25-05 12:07 PM
Project
0 2,409
http://p13.freep.cn/p.aspx?u=v20_p1_photo_1105250239256753_0.jpg I have worked on this for whole morning, but...
May24-11 01:43 PM
Junjie
0 691
I'm sure someone else must have come up with this (the description in the third paragraph), but I haven't seen it....
Nov15-10 06:40 PM
DaleSpam
5 892

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