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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
Mar11-14 10:20 AM bcrowell 
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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 40,585
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 40,240
Bit confused regarding how non-inertial frames can be treated in GR (and by non-inertial i mean affected by some kind...
Feb28-14 01:58 AM
WannabeNewton
1 287
I am trying to write the Einstein field equations $$R_{\mu\nu}-\frac{1}{2}g_{\mu\nu} R=\frac{8\pi G}{c^4}T_{\mu\nu}$$...
Feb27-14 10:56 PM
Nabigh R
2 462
There is a moving light clock at a certain velocity. For an outside observer, the light just seemed to be traveling in...
Feb27-14 07:04 PM
DaleSpam
28 1,052
If we consider a perfect relativistic fluid it has energy momentum tensor $$T^{\mu \nu} = (\rho + p) U^\mu U^\nu +...
Feb27-14 05:53 PM
TrickyDicky
15 471
The solution of Einstein's field equations for a simple black hole show a slowing of time as you get close to the...
Feb27-14 11:44 AM
PAllen
37 2,033
Hi guys, Firstly apologies if this question has been asked before (or are stupid questions) or better explained...
Feb27-14 08:58 AM
jtbell
5 558
This is a purely terminological question. Consider the following setup: we have two inertial observers A and B at rest...
Feb26-14 04:28 PM
bcrowell
14 956
Hello To demonstrate that we can deduce from special relativity the existence of an observer who finds that his...
Feb26-14 01:26 PM
DaleSpam
54 2,119
I recently watched a video in Einstein's train though experiment. www.youtube.com/watch?v=wteiuxyqtoM From what...
Feb26-14 11:29 AM
Yashbhatt
17 719
Suppose we have an event horizon H which is a light-like, closed 2-surface. Photons radiated outwards at the horizon...
Feb25-14 09:41 PM
George Jones
3 339
Trying to understand the conservation of relativistic momentum, I thought of this problem. It's very simple, and...
Feb25-14 03:55 PM
epovo
2 286
I was just reading the sci.physics.faq http://math.ucr.edu/home/baez/physics/Relativity/SR/rigid_disk.html on the...
Feb25-14 02:46 PM
bcrowell
15 491
Hi all, I tried searching for this but failed to find an answer to my question. I am having an issue with properly...
Feb25-14 01:01 PM
scinoob
12 793
Howdy, This is my first post. Please be gentle. ;-) I have been thinking about the speed of light. Scenario...
Feb25-14 09:19 AM
dauto
4 447
Sorry I'm new to this. There are apparently four forces in the universe: Gravity, EM, Weak and Strong. Is gravity...
Feb24-14 04:19 PM
pervect
7 628
hi guys i have question can any body answer please. why the light fell in to the black hole whether it have no mass.
Feb24-14 02:43 AM
mra20x
3 332
Could spacetime itself be a field?
Feb24-14 12:01 AM
Fredrik
5 322
i have asked my physics and maths teacher a question which they could not answer, the question follows:- Does the...
Feb23-14 06:30 PM
pervect
15 775
I'm working through A. Zee's new EGR book, and I came to a step on tidal forces I couldn't follow. He presents the...
Feb23-14 10:33 AM
russelljbarry15
4 522
Is there an absolute sequence of events in the universe- independent of observation? It seems like so much emphasis is...
Feb23-14 03:08 AM
adrian_m
6 674
In the spirit of this forum I should first announce: -generally, I have no idea what I'm talking about but look for...
Feb23-14 12:29 AM
ghwellsjr
6 488
In Special Relativity the example is given of a pole that alternates color, as seen in its own rest frame. Someone in...
Feb22-14 09:56 PM
gabeeisenstei
19 696
Before I get down to business, I would like to note (you don't have to read this; feel free to skip to where it says...
Feb22-14 06:31 PM
pervect
2 313
Is it true that the speed of light is a conversion factor between time and space? and that D = C*T? and if it...
Feb22-14 05:51 PM
FactChecker
8 562
When we way that \frac{d^3p}{p_0}=\frac{d^3p}{\sqrt{m^2+\vec{p}^2}} is the invariant volume element, is that...
Feb21-14 10:36 PM
pellman
2 364
I am currently studying special relativity on my own and I am looking into space time and space time diagrams. While...
Feb21-14 07:31 PM
PeterDonis
5 398
In another thread we determined that the proper total force acting on an orbiting object in the Schwarzschild metric,...
Feb21-14 09:11 AM
Mentz114
5 416
Dumb question....but thought I'd throw it out there. So, ever since I was a little kid of 6 or so, I loved to look...
Feb21-14 08:55 AM
phinds
13 545
This is a very basic question, but I cannot get my head around the following: Any physical system should be invariant...
Feb20-14 02:22 PM
PAllen
34 1,209
Let's imagine a rocket orbiting the earth. The rocket could be any real rocket with moderate speed, so that...
Feb19-14 07:51 PM
PAllen
11 628
I was reading some posts on one of my previous threads (great discussion there btw) and I red something that I really...
Feb19-14 06:20 PM
WannabeNewton
23 1,013
I've been watching the Stanford lectures on GR by Leonard Susskind and according to him the metric tensor is not...
Feb19-14 02:08 PM
Chestermiller
9 718
I have been wondering what to expect if there was a hole, from pole to pole, that inside which we could measure the...
Feb19-14 12:16 PM
PeterDonis
88 2,649
When I studied special relativity for the first time, I encountered the exemple of a infinite neutral wire in the...
Feb18-14 09:18 PM
jartsa
8 720
On page 161 of Carroll's Spacetime and Geometry, Carroll writes that \delta...
Feb18-14 03:32 PM
Bill_K
9 417
We all know that the energy-momentum tensor for dust is just ##T^{\alpha\beta}=\rho_0 v^\alpha v^\beta##, where...
Feb18-14 02:57 PM
dEdt
0 292
I am currently taking an undergraduate modern physics course that offers a brief overview of relativity. Let us...
Feb18-14 07:49 AM
Chestermiller
12 568
It is said that Relativity proves that if one travels near the speed of light that time slows down, i.e. that the twin...
Feb18-14 05:38 AM
DaleSpam
2 348
Let's say there's a wormhole entrance on the floor of my room, and the exit would be on the ceiling. If I drop a ball...
Feb17-14 11:17 PM
HarryRool
9 520
If light approaches a black hole will it accelerate? I think this question ties in with whether light has mass or not....
Feb17-14 10:30 PM
A.T.
10 529

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