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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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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 37,211
The notion of parallelism between a vector and a covector comes up naturally in the following context. Say you have a...
Dec17-13 09:14 AM
stevendaryl
9 502
Hi all, I'm sure that things similar to this have been covered before. Also, I'm sure that a Minkowski diagram...
Dec17-13 08:45 AM
ScottTracy
11 707
I recently posted another thread on the General Physics sub forum, but didn't get as much feedback as I was hoping...
Dec17-13 03:39 AM
Bill_K
4 528
Is there a single equation that can model both spacial and temporal metric contraction simultaneously? And also what's...
Dec16-13 04:31 PM
berkeman
30 585
Our current version of the Schwarzschild metric is d\tau^2=(1-r_s/r)dt^2-(1-r_s/r)^{-1}dr^2-r^2d\Omega^2 where c...
Dec16-13 09:54 AM
stevendaryl
99 5,848
Hello, I have the Perimeter Institute Activity Package on Special Relativity and I am working through the problems...
Dec15-13 07:53 PM
Simon Bridge
9 783
Hi I have buyed the book Spacetime physics - Introduction to Special Relativity; Second Edition. It is a great...
Dec15-13 01:45 PM
jtbell
1 832
If you could create a small space on earth in which a person could fit that was totally unaffected by gravity, or that...
Dec15-13 12:35 PM
Vanadium 50
14 729
In linearized gravity we can one sets $$(1) \ \ g_{\mu \nu} = \eta_{\mu \nu} + h_{\mu \nu}$$ where h is taken...
Dec14-13 10:35 AM
Bill_K
2 515
Am I correct in my understanding that two objects moving away from each other movee away from each other at the speed...
Dec14-13 10:13 AM
Naty1
3 578
As I understand it, the value of a 4-vector x in another reference frame (x') with the same orientation can be derived...
Dec13-13 07:06 AM
Bill_K
6 700
I am studying relativity by myself. There is one problem in the book which says that the 4-dot product of the...
Dec13-13 04:31 AM
vanhees71
3 781
Hi All, I studied about Michelson Morley experiment in my graduation in the compulsory Physics paper. I had...
Dec13-13 03:14 AM
TumblingDice
25 1,374
in relativity theory, in a certain "rapid space" the distance between two neighboring points is given by- ds=√...
Dec12-13 11:49 PM
nafizamin
6 606
I'm debating whether this should go in the GR & SR section, but anyways, I heard both claims and both of them are...
Dec12-13 04:46 PM
Bill_K
18 1,284
This question has been asked two years ago, but it wasn't resolved (I think). Here goes This problem is Problem 5...
Dec12-13 03:09 PM
Bill_K
1 455
Hi, I've taken a course in SR and studied GR on my own, but I do not know how to solve problems of this type. This is...
Dec11-13 05:46 PM
tom.stoer
10 938
Hi, As is well known, Relativity claims that a rod of a given proper length will appear length contracted when...
Dec10-13 07:34 PM
pervect
67 3,208
What is the defining moment when you use relativistic equations instead of classical ones? I have heard something as...
Dec10-13 01:41 AM
Blackthorn
3 524
The approach taken in linearized gravity seems to be to 'perturb' the 'Minkowski metric' such that $$g_{\mu \nu} =...
Dec9-13 07:00 PM
WannabeNewton
1 463
Hi, I know these questions must sound ridiculous and I apologize, I'm a newbie. My textbook says that the inner...
Dec9-13 01:27 PM
sciencegem
3 566
Huffingtonpost ran a story heaping praise on a guy for demonstrating GR with the old "rubber sheet" analogy. This demo...
Dec9-13 12:15 PM
WannabeNewton
18 1,226
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
6 586
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
13 974
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
10 914
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 1,513
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
9 986
In various other threads we have been kicking around various equations for a spherical shell and discussing the...
Dec7-13 10:39 PM
PeterDonis
7 820
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
4 397
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 1,247
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
2 588
hi people! please can any one explain me the conclusions of a thought experiment given below ? consider yourself...
Dec6-13 09:18 PM
PeterDonis
8 950
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
7 625
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
8 640
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 1,738
Please view the following... http://www.wimp.com/visualizegravity/ This is the way scientists try to explain the...
Dec4-13 09:48 PM
dauto
2 684
The Lorentz group generators, in any representation, satisfy the commutation relation = i \left( g^{\nu...
Dec4-13 05:16 PM
spookyfish
7 852
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
8 920
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
2 460
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
16 932

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