
The section of the Usenet Physics FAQ titled "Experimental Basis of Special Relativity" has been cited here many...

Dec3107 02:06 AM
jtbell

0 
42,134 
Before posting anything, please review the Physics Forums Global Guidelines.
If you are seeking help with a...

Feb2313 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...

Jan711 07:38 PM
JesseM

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5,647 
There seems to be an emphasis in several books on general relativity that the metric (components) in itself does not...

Apr2313 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...

Dec910 07:26 AM
stevebd1

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1,819 
Hi all,
I would like to write down the arclength parametrization of a curve in 3dimensional Euclidean space,...

Jun106 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...

Mar2010 12:15 PM
Stingray

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973 
I'm in an intro course and my shaky ability to solve differential equations is apparent.
How would you go about...

Dec811 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...

Aug1009 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...

Aug1305 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...

Feb704 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...

Dec812 06:33 AM
TrickyDicky

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10,690 
My physics teacher has informed us that for our mock waves exam we are going to be given some relativistic questions...

Sep211 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:...

Aug3013 06:07 PM
The_Duck

1 
466 
Consider the equatorial plane of a spherically symmetric spacetime. Then we can write the metric in the equatorial...

Apr1913 11:34 PM
pervect

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1,029 
Professor Ramamurti Shankar has four entertaining introductory lectures on SR (lectures 1215) among the lectures for...

Jul2908 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...

Dec810 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...

Apr507 12:08 PM
pervect

6 
1,060 
Hello fellow physicsists!
I have some (and will probarbly get more) questions about differential geometry and...

Jun2512 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...

Aug2904 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...

May2014 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...

Nov3012 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...

Dec811 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...

Aug2904 07:18 AM
eljose79

5 
1,229 
Why do we say that the position 4vector, x^{\mu}, is naturally contravariant and that the del operator,...

Feb2706 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...

Jul1709 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...

Feb2410 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...

Apr2509 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...

Feb1507 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:

Oct2310 05:13 PM
yuiop

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2,229 
I hope that a short discussion of the history of theoretical development is not too much offtopic here; this is a...

Feb1112 10:42 AM
harrylin

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3,288 
Hi, I have 2 little questions and hope to find some clarity here. It concerns some mathematics.
1) Is the variation...

May207 04:11 AM
haushofer

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3,384 
In the cosmology forum I have admitted to understanding GR only dimly despite, in a previous thread in this forum...

May207 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...

Jan507 02:47 AM
anantchowdhary

44 
6,332 
Here are two statements of Birkhoff's theorem:
"Any spherically symmetric solution of the vacuum field equations...

Aug1210 05:22 PM
atyy

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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...

Feb1311 02:01 PM
Fredrik

28 
1,849 
Hey,
Starting with the conversation law for the stressenergy tensor; T^{\alpha \beta}{}_{,\beta}=0 . Does anyone...

Oct2509 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...

Oct113 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....

Apr1210 11:02 AM
ZapperZ

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3,337 
Scenario 1:
A photon is travelling straight towards a star. As it goes deeper in the star's gravitational well, its...

May910 04:44 PM
espen180

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684 
I'm coming at this from the perspective of something that might be used in a general discussion piece on SR, or maybe...

Mar3106 04:16 PM
clj4

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1,203 
How can we visualize 4D spacetime and how gravity plays a role in 4D spacetime??

Jan2907 03:34 PM
Schrodinger's Dog

3 
1,067 