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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 42,485
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 42,141
Hi people, I have the following question: First, here is a concise statement of the major neutrino speed...
Dec9-13 05:51 AM
Vanadium 50
6 649
Gentlemen- What does the stress-energy tensor describe? The tt term of the stress-energy tensor expresses energy...
Dec8-13 08:09 PM
Simon Bridge
13 1,068
How do we know a "photon" is massless? Do we have any experimental proof? Photon has momentum, it even bends in...
Dec8-13 01:04 PM
PeterDonis
10 1,190
I suspect this is somewhat off the beaten track here, but there may be some few that could give it a go. Einstein...
Dec8-13 05:24 AM
K^2
18 2,149
Hi guys, I am reading griffiths electrodynamics. I have a question. How does Maxwell equation suggest that the...
Dec8-13 02:22 AM
Rena Cray
9 1,245
In various other threads we have been kicking around various equations for a spherical shell and discussing the...
Dec7-13 10:39 PM
PeterDonis
7 991
Hello Everyone, I came here with a question and hope you can shed some light. We know that Ricci tensor which...
Dec7-13 10:15 PM
vaibhavtewari
4 464
Hi, In classical and quantum physics and even in special relativity, shifting the energy of a system by a constant...
Dec7-13 10:44 AM
George Jones
28 1,494
I know about the Michaelson-Morley expt. trying to measure the speed of light, once in the direction of motion of the...
Dec7-13 01:25 AM
ghwellsjr
2 651
hi people! please can any one explain me the conclusions of a thought experiment given below ? consider yourself...
Dec6-13 09:18 PM
PeterDonis
8 1,117
Question in the subject. I have no idea what the DoD's interest is in this. Sorry is this is the wrong forum.
Dec6-13 10:30 AM
TomServo
7 713
Would there be a direct proof of the energy-stress tensor of general relativity? My lecturer only provides me with a...
Dec5-13 10:23 PM
WannabeNewton
8 794
Consider two iron rods of about 10 metres separated by 10 metre. They are in series position and not connected in...
Dec5-13 07:40 AM
DaleSpam
39 2,017
Please view the following... http://www.wimp.com/visualizegravity/ This is the way scientists try to explain the...
Dec4-13 09:48 PM
dauto
2 787
The Lorentz group generators, in any representation, satisfy the commutation relation = i \left( g^{\nu...
Dec4-13 05:16 PM
spookyfish
7 1,020
Hello there! I have a more or less silly and possibly obvious question that's been bugging me a lot. Here's the...
Dec4-13 02:54 PM
George Jones
8 1,087
Hi, Is it pure coincidence that if you put ##c=v_e=\sqrt{2GM/R}## in the escape velocity, you end up with the...
Dec4-13 02:11 AM
dvf
2 681
Hi all, think this might be a silly or trivial question but I've got myself in a bother so thought I'd get some help....
Dec3-13 02:59 PM
WannabeNewton
16 1,052
For example let's say i have two rods of same length ie. 4metres placed in a series position. They are separated by a...
Dec3-13 09:11 AM
PeterDonis
11 886
There is any field in General Relativity(I know gravitational field but it is not that which I mean) Thanks
Dec3-13 09:09 AM
WannabeNewton
2 538
Hello all, I have a geodesic equation from extremizing the action which is second order. I am curious as to what...
Dec2-13 02:29 PM
Bill_K
7 578
First of all, Happy Thanksgiving to you all! Now, my question: I'm on earth viewing through a telescope. I...
Dec2-13 10:09 AM
ghwellsjr
44 1,608
Most of the paradoxes are solved by either "Relativity of simultaneity" or "Born rigidity" And there is a 3rd tool...
Dec2-13 06:07 AM
AndrzejK
60 3,471
Hi, I'm new posting to these forums, so I'm not sure if this is in the right place. Anyway, here it goes: I've...
Dec1-13 11:57 PM
yogi
40 2,693
Hi, GR permits wormholes hypothetically right? But surely they should violate conservation of energy because if one...
Dec1-13 08:03 PM
WannabeNewton
1 576
I'm very noob at this and am a bit confused: Formula 1: E_T = \gamma \cdot m c^2 Formula 2: p = \gamma m v...
Dec1-13 05:41 PM
PAllen
9 993
We have three observers. The A is in earth,B is into a car that runs with big speed,C is out of galaxy. All...
Dec1-13 03:18 PM
Nugatory
7 490
I had always thought that length contraction meant that the object itself shrunk but I stumbled across an article...
Dec1-13 01:47 PM
Superposed_Cat
8 647
hi there, In this Ex ( see attached snapshot ), point b), the poisson bracket equation is not so straightforward to...
Nov30-13 12:25 PM
WannabeNewton
9 544
I mean the application,such as because of the time dilation, humans can observe some particles which don't have long...
Nov30-13 10:47 AM
phinds
2 437
My understanding is that an outside observer sees objects undergo time dilation as they approach sources of gravity,...
Nov30-13 10:25 AM
WannabeNewton
10 781
Hello, Can someone please help me to understand equation (10) from this article http://arxiv.org/abs/gr-qc/0607020....
Nov30-13 08:02 AM
Bill_K
1 612
The invariant mass of special relativity: m_0{^2} = E^2 – p^2 There doesn't seem to be any quantity with units...
Nov28-13 09:45 PM
Rena Cray
18 1,657
Well, I'm totally in a mess now
Nov28-13 02:01 PM
dauto
4 422
The problem has been shown in the picture. Because of relativity, both the guys on the ground and on the vehicle would...
Nov28-13 09:25 AM
Mentz114
9 890
Hi all. Hoping someone can give me a brief explanation re: a problem I'm having in trying to understand SR. Not...
Nov28-13 06:31 AM
DaleSpam
55 4,418
Does the curvature of spacetime have a unit?
Nov28-13 01:46 AM
Rena Cray
10 679
Consider a perfectly spherical dust shell with a large internal cavity. Imagine there is a moment when the dust is...
Nov27-13 10:44 PM
PeterDonis
14 756
We know that the mass of any body turns to zero as it gains the velocity of light. From Einstein's Mass-Energy...
Nov27-13 04:35 PM
PAllen
5 647
I've managed to confuse myself and don't understand the difference between the formula for Lorentz time transformation...
Nov27-13 11:48 AM
yuiop
3 562

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