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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
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 42,134
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Feb23-13 08:40 AM
ZapperZ
1 42,478
For Minkowski spacetime, the metric is: ds^2 = -dt^2 + dx^2 + dy^2 + dz^2 I have read there is a solution when...
Jan7-11 07:38 PM
JesseM
55 5,647
There seems to be an emphasis in several books on general relativity that the metric (components) in itself does not...
Apr23-13 10:00 AM
Samshorn
13 801
Based on this paper (page 37), closed timelike curves exist within a boundary dictated by g_{\phi \phi}=0 which occurs...
Dec9-10 07:26 AM
stevebd1
23 1,819
Hi all, I would like to write down the arc-length parametrization of a curve in 3-dimensional Euclidean space,...
Jun1-06 03:52 PM
pmb_phy
12 1,278
Hello Anybody know how we can solve the equations of geodesic deviation in a given spacetime whether approximately...
Mar20-10 12:15 PM
Stingray
1 973
I'm in an intro course and my shaky ability to solve differential equations is apparent. How would you go about...
Dec8-11 05:34 PM
pervect
1 1,926
Firstly, just to confirm, the value for velocity in the equations to calculate time dilation is the speed at which two...
Aug10-09 07:11 AM
hunar
14 1,772
I need to clear some conceptual doubts in the Special theory of relativity. So could anyone explain them in context to...
Aug13-05 06:18 PM
Doc Al
14 1,593
There is a couple of questions that have arisen after i read about the general theory of relativity. 1. Should it...
Feb7-04 11:11 PM
Stingray
26 6,232
I'm a little confused about certain assumptions usually made in GR as to how rigorous they are mathematically...
Dec8-12 06:33 AM
TrickyDicky
149 10,690
My physics teacher has informed us that for our mock waves exam we are going to be given some relativistic questions...
Sep2-11 09:23 AM
Mr. Heretic
5 1,964
It seems like Zee lost a trace in his new GR text, but I am sure it is me confusing things. First, he establishes:...
Aug30-13 06:07 PM
The_Duck
1 466
Consider the equatorial plane of a spherically symmetric space-time. Then we can write the metric in the equatorial...
Apr19-13 11:34 PM
pervect
11 1,029
Professor Ramamurti Shankar has four entertaining introductory lectures on SR (lectures 12-15) among the lectures for...
Jul29-08 05:20 PM
Peeter
0 1,068
Hi, I am in the process of trying to teach myself GR Maths, at the A101 level, and have been working through the idea...
Dec8-10 09:01 AM
Mentz114
5 1,396
Silly proposition - but take the peculiar results predicted by Einstein in Part IV of the 1905 paper with a little...
Apr5-07 12:08 PM
pervect
6 1,060
Hello fellow physicsists! I have some (and will probarbly get more) questions about differential geometry and...
Jun25-12 09:15 AM
Muphrid
9 1,160
If we take a photon as our frame of reference is it safe to say that the universe moves relative to "Us" at the speed...
Aug29-04 06:12 PM
Nenad
44 3,441
I have been reading GR but I have these gaps in understanding. Can someone help clear them? 1) SR has a...
May20-14 09:55 PM
Matterwave
5 589
Hi, I have some questions about general relativity. I'd appreciate if somebody could enlighten me :) I heard that...
Nov30-12 02:18 PM
PeterDonis
24 1,833
I have some questions about time dilation I not really understand to come further (and I find it all very...
Dec8-11 09:19 PM
digi99
8 2,687
a)Can we add extra terms with covariant derivative equal to 0 so the coupling constant in relativity is...
Aug29-04 07:18 AM
eljose79
5 1,229
Why do we say that the position 4-vector, x^{\mu}, is naturally contravariant and that the del operator,...
Feb27-06 06:43 PM
pmb_phy
13 1,425
I am not interested in knowing the detailed calculation but would be more than happy if you could just answer the...
Jul17-09 05:00 AM
A.T.
41 3,277
2 random thoughts that struck me: Q1. If an object is moving downwards towards a large mass at just under the speed...
Feb24-10 03:31 PM
bcrowell
1 893
Hello PF, I have some questions which I cant get an answer, and everything I think is based on intuition and not on...
Apr25-09 08:35 AM
Dweirdo
16 1,491
A discussion with nakurusil left open some questions to which answers are highly appreciated. 1. We measure in...
Feb15-07 03:38 AM
pmb_phy
29 4,279
Does " What you don't see with your eyes, don't invent with your mouth" does work in special relativity?:rofl:
Oct23-10 05:13 PM
yuiop
5 2,229
I hope that a short discussion of the history of theoretical development is not too much off-topic here; this is a...
Feb11-12 10:42 AM
harrylin
12 3,288
Hi, I have 2 little questions and hope to find some clarity here. It concerns some mathematics. 1) Is the variation...
May2-07 04:11 AM
haushofer
0 3,384
In the cosmology forum I have admitted to understanding GR only dimly despite, in a previous thread in this forum...
May2-07 07:25 PM
pervect
18 3,181
1. Does light(photons) have 0 mass or infinite?(b/c it its mass would be zero, it would take no energy to slow it...
Jan5-07 02:47 AM
anantchowdhary
44 6,332
Here are two statements of Birkhoff's theorem: "Any spherically symmetric solution of the vacuum field equations...
Aug12-10 05:22 PM
atyy
4 914
I don't think this should be a very difficult question for people who are used to working with tensors, but I'm new to...
Feb13-11 02:01 PM
Fredrik
28 1,849
Hey, Starting with the conversation law for the stress-energy tensor; T^{\alpha \beta}{}_{,\beta}=0 . Does anyone...
Oct25-09 05:44 AM
haushofer
11 1,177
I've just started learning about special and general relativity and came up with a couple of questions that look like...
Oct1-13 03:25 PM
Serioza
5 1,076
1. A clock is placed on a light beam. Will the clock stop? If yes, why doesn't the beam stop altogether? 2....
Apr12-10 11:02 AM
ZapperZ
39 3,337
Scenario 1: A photon is travelling straight towards a star. As it goes deeper in the star's gravitational well, its...
May9-10 04:44 PM
espen180
4 684
I'm coming at this from the perspective of something that might be used in a general discussion piece on SR, or maybe...
Mar31-06 04:16 PM
clj4
2 1,203
How can we visualize 4D spacetime and how gravity plays a role in 4D spacetime??
Jan29-07 03:34 PM
Schrodinger's Dog
3 1,067

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