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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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The section of the Usenet Physics FAQ titled "Experimental Basis of Special Relativity" has been cited here many...
Dec31-07 02:06 AM
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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
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I can't figure this out. Say 2 frames are in relative motion. When the origins at at the same place, 2 lasers shoot...
Oct21-13 06:42 PM
4 411
Suppose we have two equal masses, say at least the mass of our sun separated by a distance of 1 ly and devoid of all...
Dec5-07 01:31 AM
15 2,913
Q1 If given a 2D Riemannian space, ds^2 = dx^2 + x^2dy^2, do the componets of the metric tensor are these: g_11 = 1,...
Nov3-05 10:59 AM
Jimmy Snyder
6 1,193
I'm sorry this could be obvious but i thought I'de ask ok if 2 objects travailing at 1/2 of the speed of light are...
Oct8-11 01:28 AM
2 976
I was reading an article about how two protons have less mass combined than by themselves to make helium, which gives...
Jul6-11 04:37 AM
3 760
here are two kinda simple questions that I wanted to ask, just to clairify something for me. 1. at the event...
Jun18-04 10:05 AM
4 1,364
1. In general relativity, why is there a requirement for spacetime, in the context of the Universe, to...
Jul18-05 08:02 PM
James R
2 961
I have two questions...let's suppose we have a metric in the form: ds^2 =f(t)dt^2 +g(x)dx^2 +H(y)dy^2 So...
Jul24-06 03:04 PM
3 938
First, a really basic one: if Jack is jogging past me with a constant speed, and I observe that speed to be v in my...
May29-13 10:33 AM
7 520
If 2 balls or cylinders with watches inside were spun one at close to the speed of light, the other at half the speed...
Aug23-10 01:43 AM
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I was just reading the sci.physics.faq on the...
Feb25-14 02:46 PM
15 426
I started attending to GR lectures, and there we referred to an intelingent beetle living on a 2D flat space and...
Apr10-14 10:54 AM
0 200
I am interested in solving the null geodesic between two points in the presence of a gravitational mass, assuming that...
May26-09 08:28 AM
1 1,292
Hello all, I have a 2D Riemann metric tensor with coordinates (x,y) in a half-plane -Infinity < x < Infinity, y >...
Jul12-06 01:43 PM
0 1,992
will a 2m(rest length) car moving near lightspeed fall in a 1m hole?
Feb5-11 07:33 AM
11 1,476
In the weak field approximation, g_{\mu\nu}=\eta_{\mu\nu}+h_{\mu\nu} If we make a coordinate transformation of...
Nov20-11 09:37 PM
Sam Gralla
4 883
I just a beginner for relativity (both GR & SR), so you find my question may be very simple but still hope you can...
Sep15-05 12:16 AM
1 1,229
Hi, could someone clarify some concepts and definitions for me, concerning how velocity and acceleration are...
Jul1-08 07:31 PM
10 2,022
I'm wondering if the perception of spacetime as "3 dimensions of space and 1 of time" is a symptom of our inability to...
Mar31-10 08:31 PM
Frame Dragger
171 9,881
Though i've always been familiar with the very (very) basic implications of relativity, I've only just now gone into...
Jun1-13 01:48 PM
6 523
Is there any fundamental difference between the 3 dimensions of space that we experience. Such as the difference that...
Jul31-08 03:15 AM
1 1,550
Hi, As I understand things we exist on the 'surface' of a 3 sphere of radius R in the context of general...
Oct11-05 01:14 AM
2 905
This has to do with the ADM formulation of GR. I am following MTW chapter 21 and Wald appendix E and chapter 10. ...
Mar12-12 06:10 PM
12 1,097
Today I was conversing online in a gaming community and we began talking about relativity. Eventually we started...
Jan30-10 09:10 PM
5 1,426
Hi, Does anyone know of any recently published books that might bring the discussions in "300 Years of Gravitation"...
Mar15-10 10:17 PM
1 1,051
I'm working on the decay width of a 3body decay with my professor, I'm stuck and he's not being forthcoming. ...
Aug25-10 12:03 PM
0 1,082
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
9 2,175
P = \left( \begin{array}{c} E/c \\ \bar{p} \end{array}\right) and U = \left( \begin{array}{c}
May23-12 09:32 AM
2 631
How to show that the electromagnetic 4 potential is a 4-vector?
Feb5-12 07:03 PM
20 2,101
In the wikipedia page a distinction is made in the definition of the SR 4-acceleration between the case with...
Jan20-14 03:32 PM
4 320
Consider the thought experiment in the diagram below. ...
Feb12-14 05:27 PM
12 682
A blue guy and a red guy are moving at the same speed in opposite directions with respect to some rest system as...
Sep29-11 07:36 PM
17 2,655
Basic 4 momentum questions. Trying to understand SR a bit better. Suppose m is non zero for a particle (m being...
Jun10-10 05:41 PM
7 901
2 Weeks ago..i was reading the novel "The time Ships"... by Stephen Baxter (the second part of "the time machine" by...
Aug22-06 02:40 PM
2 1,402
Since the "tensors" of relativity are defined with respect to the tangent spaces of a pseudo-Riemannian manifold,...
Oct6-10 10:00 AM
4 1,400
Newton's second law of motion is given in Minkowski space by \bar{F}=m(c\gamma\dot{\gamma},...
Apr5-12 12:30 PM
1 980
Are there names for the Lorentz invariant norm of the four-potential and four-current? I assume that they are...
Nov22-04 02:12 PM
2 2,363
Hi all, I had a rather poor introduction to special relativity and right now I'm refreshing myself in order to...
Nov23-07 07:17 AM
12 2,133
In relativity we have u^\mu u_\mu=c^2, which is just another way of saying that p^\mu p_\mu=m^2c^2 or...
Jan15-10 07:08 PM
6 1,193
Hey all, my first post here. Now, Im trying to derive the 4-acceleration from the 4-velocity by explicitly...
Oct9-06 02:21 PM
1 4,050

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