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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 40,714
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 40,363
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 1,938
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 2,136
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 1,691
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 1,875
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 2,024
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 1,836
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 6,373
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 4,927
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 2,224
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 2,850
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 2,547
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 1,612
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 1,410
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 2,097
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 2,054
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 1,088
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 2,438
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 13,119
"Violation of the equivalence principle for stressed bodies in asynchronous relativity" ...
Apr8-08 06:46 PM
pmb_phy
5 1,267
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 7,868
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 1,747
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 6,818
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 3,875
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 1,721
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 4,364
Does anyone know how to derive the wave equation in curved spacetime? (-g)^{-1\over 2}\partial_\mu((-g)^{1\over...
Apr7-08 11:01 PM
shoehorn
4 3,690
I'm still struggling with the concept of a mass of a photon. I understand that photons have momentum because of their...
Apr7-08 09:54 PM
pmb_phy
10 2,045
Can someone please have a look at my analysis here and tell me if there are any mistakes the rest of the pistures are...
Apr7-08 08:48 PM
phyti
36 2,919
Electrical means are the only way to achieve high speeds of a particle. Is it possible that you reach a limiting speed...
Apr7-08 05:24 PM
clem
1 878
Does anyone know how to derive the quantum mechanical flux in curved spacetime? e.g. flux = {1 \over...
Apr7-08 01:06 PM
Pacopag
0 1,429
I have a question about someone falling into a black hole. General relativity predicts that the reference frame of an...
Apr7-08 12:38 PM
michael879
6 3,728
An astronuat in a nuclear ship accelerates away from earth and gets very near the speed of light, .99999% in fact. ...
Apr7-08 11:27 AM
LURCH
9 1,668
according to the theory nothing is faster than light so if there were a rod very very long(eigth ligth min long) and...
Apr6-08 11:36 PM
korinteren
36 3,416
A small but possibly important correction: Back in May 2006, pervect cited a page he found at the well known...
Apr6-08 11:09 PM
Johnsr86
9 11,483
Hey guys, what exactly is a 3 momentum? I can't any references to it anywhere on the net, which actually tells me what...
Apr6-08 05:06 PM
jtbell
8 2,832
time, travel Time Travel ( 1 2 3 ... Last)
Hello everyone, I am new to this forum and would greatly appreciate your expertise in answering (or attempting to) a...
Apr6-08 02:58 PM
oliverswanshu
55 6,573
As an object that you have thrown is flying through the air, how can it know that it has kinetic energy? If you...
Apr6-08 11:14 AM
korinteren
22 5,439
lest say you have a man on the moon and one on mars. For them to be in the same frame of ref the only parameters that...
Apr6-08 06:43 AM
matheinste
8 1,260
Does the theorem still hold true, but triangle sides are curves?
Apr6-08 06:08 AM
Ulysees
14 5,357
How does nonlinearity of the gravitational field equations follow from the equivalence principle? I remember hearing a...
Apr6-08 05:47 AM
MeJennifer
1 1,135

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