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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 41,556
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 41,199
Has anyone ever analysed Einstein's equations in 1+1 spactime dimensions? It seems to me like this would provide a...
Apr16-08 09:46 AM
coalquay404
2 2,025
The obvious objection to the famous thought experiment with one of a twins moving away from the earth is, couldn't you...
Apr15-08 12:02 PM
Mentz114
15 2,418
A long time ago, Galileo stated the vertical motion of a falling body is not influenced by its horizontal motion. Is...
Apr15-08 10:30 AM
Jorrie
71 11,774
I guess this is my last theme here with this nick and from this IP:) But I just love the answer that came to my mind...
Apr15-08 09:23 AM
neopolitan
1 1,955
I am not a physics expert but have been having a discussion about the effects of the Special Theory of Relativity with...
Apr15-08 07:45 AM
jtbell
21 2,470
So after hearing a few theories, I had this idea that seems to make some sense. The problem is that all of the math...
Apr14-08 07:09 PM
RandallB
1 1,160
I understand that the speed of light in a vacuum is supposed to be constant. However, I am having a problem...
Apr14-08 04:46 PM
paw
14 2,295
While reading about the de Sitter universe I usually see the following relation between the curvature scalar and the...
Apr14-08 12:42 PM
Magister
0 1,276
I am sure this question in some form gets posted here all the time again and again, but I somehow can not find it in...
Apr14-08 09:41 AM
jviksne
7 1,307
Last night I watch a show about the birth of our sun on the Science channel. At one point they talked about how it...
Apr13-08 10:33 PM
Helios
5 3,246
I am not a physics major but have always been perplexed by the apparent paradox of two issues: 1. If we use the...
Apr13-08 06:11 PM
Mentz114
4 941
Figure 2-4 in "Spacetime Physics" by Taylor & Wheeler The figure illustrates the effects of free float on the...
Apr13-08 04:16 PM
Daverz
5 1,617
Im trying to describe a system of two kerr black holes and I was wondering if this was even possible? Im currently...
Apr12-08 07:33 PM
xantox
5 1,419
I'm doing a research project for a class in advanced differential geometry, and have chosen to cover dynamical...
Apr12-08 05:51 PM
geoffc
7 3,016
like my previous post on two body black hole solutions, Ive got a question about a non-stationary black hole which is...
Apr12-08 05:47 PM
michael879
2 1,191
Suppose you have a spacetime with an observer at rest at the origin, and the surface at t = 0 going through the...
Apr12-08 03:53 PM
lark
0 1,948
I've read Schwarzschild paper and I don't understand his conditions "The solution is spatially symmetric with...
Apr12-08 11:47 AM
tiny-tim
2 2,145
Can anyone tell me where can I get detailed derivation of Planck-Einstein Transformation of temperature in the...
Apr12-08 09:11 AM
Frank Lampard
0 1,703
Why is Einstein's law of gravitation for empty space sometimes identified as Ricci tensor=0 instead of Einstein...
Apr11-08 11:00 PM
snoopies622
5 1,985
i need some help here, say if there's a ship, no matter how it steers, it will always end up at the starting point,...
Apr11-08 08:30 PM
Wizardsblade
7 2,026
Einstein's second postulate states that the speed of light is constant as viewed from any frame of reference. Most of...
Apr11-08 07:23 PM
phyti
10 1,855
Suppose you are given the Lagrangian of a scalar field \Phi(t) \mathcal{L} = \frac{1}{2} \dot{\Phi}- \nabla \Phi -...
Apr11-08 04:23 PM
samalkhaiat
9 6,439
I've seen several responses (and links) to the question "What happens when something is traveling at the speed of...
Apr11-08 11:03 AM
pervect
20 4,945
Given the idea that a photon experiences only one 'time-slice' from its perspective, and exists as one elongated unit...
Apr11-08 11:01 AM
pervect
7 2,299
Hi, I have a computational question about the Hilbert action with an added Gauss-Bonnet term. The Lagrangian L (...
Apr10-08 09:49 AM
haushofer
5 2,855
I'm confused about how to understand the ct dimension. I cannot get passed thinking that physically real...
Apr10-08 12:45 AM
XVX
9 2,556
Hi all - this (seeming) paradox has been brought up on a few other forums with less than illuminating results. I'm...
Apr10-08 12:02 AM
yuiop
13 1,615
I am trying to get through Special & General Relativity on my own. However I seem to reach a problem. Imagine...
Apr9-08 11:56 PM
Tachyonie
14 1,411
I like to do whirlies with the kids down in my local park. I grab them by the feet and I spin them in a circle with...
Apr9-08 07:55 PM
michael879
24 2,103
Hey guys, to further my understanding of special relativity, could you help me out with this problem: Two...
Apr9-08 04:16 PM
Antenna Guy
4 2,110
I have a few questions about these. My main question concerns the "theory" that all fundamental particles are...
Apr9-08 11:36 AM
michael879
1 1,095
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 2,442
I am trying to draw one of those nice plots of effective potential against radius , which suggest the position of...
Apr8-08 11:18 PM
Jorrie
111 13,167
"Violation of the equivalence principle for stressed bodies in asynchronous relativity" ...
Apr8-08 06:46 PM
pmb_phy
5 1,268
Hello, First post. Thank you for letting me be a part of the discussion. My question is, can the Law of...
Apr8-08 06:45 PM
superdirt
21 7,883
Ok so I begin by entertaining the following hypothesis: Suppose a number of points are selected in spacetime, and...
Apr8-08 06:38 PM
pmb_phy
10 1,750
space is flat what the hell does this mean. It must be at least six foot thick as thats how tall I am? how thick is...
Apr8-08 06:11 PM
bockerse
5 6,835
For a free relativistic particle we have the condition E^2-\mathbf{p}^2c^2=m^2c^4. putting p^0 = c^{-1}E we may...
Apr8-08 02:41 PM
pellman
3 3,891
Two masses A and B are accelerated to a velocity V on close “parallel” paths. They will experience gravity or...
Apr8-08 02:28 PM
JesseM
10 1,725
If I lift an object, does its mass increase due to my investing it with potential energy? If I then drop it, does its...
Apr8-08 11:24 AM
snoopies622
34 4,384

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