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Mar11-14 10:20 AM bcrowell 

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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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Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Feb23-13 08:40 AM
ZapperZ
1 37,474
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 37,210
Consider two points A and B (Fig.1) at rest in S frame having a distance L0 between them (a long scale may be imagined...
Mar20-14 09:38 AM
Nugatory
11 566
Hi, While reading Sean Carroll's book, I came across the following statement: Okay so this has me confused....
Mar19-14 06:15 PM
maverick280857
2 291
I'll ask that you forgive me if my question seems to "basic" or simple for some of the more professional posters. I...
Mar19-14 03:15 PM
A.T.
3 305
Hi guys, I'm reading a text regarding different possible ways of synchronizing clocks in an inertial frame, so maybe...
Mar19-14 12:43 PM
DaleSpam
7 373
At v = c, time (hence physics) stands still. You can never reach c, but lets say near enough. Therefore if you...
Mar18-14 03:39 PM
sshai45
15 579
Let's say we have a metro tunnel that is a circular loop with 1 m x 1 m rectangular cross section. The tunnel is 100...
Mar18-14 10:18 AM
DaleSpam
3 340
Never mind. Please delete this post
Mar17-14 11:35 PM
bcrowell
1 278
Hello all, In Carroll's on page 109 it is pointed out that for derivation of the geodesic equation, 3.44, a...
Mar17-14 03:37 PM
victorvmotti
26 955
While Planck time is usually regarded as the shortest unit of time, isn't the shortest unit of time that can exist is...
Mar17-14 01:58 PM
mfb
5 411
This paper discusses the Bell spaceship paradox: Petkov, "Accelerating spaceships paradox and physical meaning of...
Mar17-14 12:34 PM
PeterDonis
7 361
As I've red, different points on the rotating disk, or rotating object have different velocities and so they should...
Mar17-14 12:13 PM
ghwellsjr
3 368
I'm trying to understand inflation (in the cosmic sense). I know that ultimately that's a subject that involves both...
Mar17-14 12:11 PM
PeterDonis
1 289
I am wondering how big the local coordinate charts in a coordinate atlas of General Relativity can be. Is it just a...
Mar17-14 08:51 AM
DaleSpam
3 272
I was wondering since it is usually foliated into 2-spheres and these are not themselves parallelizable(only the...
Mar16-14 03:48 PM
TrickyDicky
6 388
Let's say we have a long cylinder and two pistons inside the cylinder, and some vapour between the pistons. Now we...
Mar16-14 11:14 AM
yuiop
24 819
I see a number of gravitational wave analytic solutions with the metric given in terms of Rosen coordinates. I have no...
Mar16-14 05:32 AM
Bill_K
5 390
Hi guys, this is my first post, I'm a newbie regarding physics and relativity so I hope you can help me here. I've...
Mar15-14 10:36 PM
grav-universe
41 1,280
Perhaps I am red-shifted, but I just saw a video demonstrating space/time as a loaf of bread and depending on how it...
Mar15-14 11:38 AM
yuiop
10 519
Einstein defined truly or absolutely synchronous clocks as follows: "The simultaneity of two definite events with...
Mar14-14 11:57 PM
pervect
1 287
Hi when trying to derive this equation, i am stuck on: =\frac{\partial \gamma^{\nu}(x)}{\partial x^{\mu}} +...
Mar14-14 08:17 PM
nuclearhead
8 1,149
In the discussion of a new FAQ entry on the Bell spaceship paradox, the following paper came up: Jerrold Franklin,...
Mar14-14 12:22 AM
bcrowell
15 663
I am having a hard time understanding a scenario that I have not found discussed elsewhere. It has to do with...
Mar13-14 09:55 PM
DaleSpam
8 440
The title says it all, really. Are we able to describe GR in terms of a Graded Time Dilation Field in Euclidean...
Mar13-14 02:49 PM
PAllen
36 1,184
One of the properties of the unique Levi-Civita connection is that it preserves the metric tensor at each point's...
Mar13-14 01:00 PM
TrickyDicky
94 2,336
Hello, ##E_{tot}^2=(pc)^2+(m_0 c^2)^2## works fine for mass ##m_0## moving with relativistic speeds. What if the...
Mar13-14 09:17 AM
DaleSpam
33 863
In Schutz, the christofell symbols are dervied from applying the product rule to a vector in a curvillinear basis. In...
Mar13-14 01:39 AM
WannabeNewton
1 371
I think I am wrong in what I am about to say so I someone could explain relatively simply where I went wrong I would...
Mar12-14 09:50 AM
Nugatory
1 270
I have always assumed once we pass through a black hole's event horizon, we can throw away the return ticket. But I...
Mar12-14 08:53 AM
PAllen
1 299
Hello, I am working on a project but I stuck at a point. I found that divergence of two objects are equal...
Mar12-14 05:17 AM
crimsonidol
0 228
Well when I watch movies I see space time as 2d. But how do we see the space time from earth to a region lower than...
Mar12-14 04:27 AM
A.T.
1 272
depending on your frame of reference, correct? If I am standing still, and at the same time (my time) shine 2...
Mar12-14 02:32 AM
BruceW
13 515
Is there any way of man, in the distant future, bend space time in a way that it would propell something faster than...
Mar11-14 10:34 PM
PeterDonis
3 298
So im trying to understand some of the ideas of relativity but there is one thing i don't get. I understand that if...
Mar11-14 09:21 PM
abbott287
4 321
I am preparing a simple demonstration of gravity for a lay audience, inspired by this applet and the well-known book...
Mar11-14 09:14 PM
WannabeNewton
1 275
We have had a number of threads on how to synchronise clocks around a rotating ring. One method of doing this is to...
Mar11-14 04:25 PM
yuiop
2 293
Hey, I read that if a four-vector is 'four-orthogonal' to a time-like four vector then it must be space-like. I showed...
Mar11-14 09:35 AM
Bill_K
1 231
i have the basic question of special relativity why time , length and mass is a function of velocity here? i may know...
Mar11-14 09:04 AM
DaleSpam
9 412
If an electron is travelling at C/2, the Lorenz formula says that mass is about 1.15 me, do we get the value of KE...
Mar11-14 07:39 AM
Dadface
20 806
I was reading a little about the behavior of non-inertial frames in relativity, since I'm interested in knowing how...
Mar10-14 10:30 PM
JVNY
61 2,089
Here for your consideration is a try at synchronizing clocks on a rim rotating at a constant angular velocity. It is...
Mar10-14 10:16 PM
JVNY
69 2,371

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