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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 41,710
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 41,351
i'm toying around with the schwarzschild metric using it to find distances from a star in sphereical coordinates. ...
Dec4-06 10:48 PM
Chris Hillman
15 3,445
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 3,445
How would you go about teaching relativity to someone who refuses to take anything on faith or argument from...
Jan5-12 07:38 AM
DaleSpam
37 3,445
We covered SR last semester in Modern Physics I and also covered early Quantum Theory and started Modern Quantum...
Jun21-10 10:25 AM
GRDixon
38 3,443
As it's known, one of the most fundamental aspects of relativity is that all motion is relative. But when we apply...
Feb1-14 10:47 AM
ghwellsjr
52 3,443
Lorentz Transformation says x'=\frac{x-ut}{\sqrt{1-u^2/c^2}} Does its derivative ...
Jun7-04 06:31 AM
hemmul
1 3,442
My limited understanding of relativity tells me that "gravitational forces" are really just due to the curvature of...
May8-06 03:51 AM
Ich
16 3,442
The Principle of Relativity, (PR) may be summarised as the doctrine of no preferred frames of reference. It not only...
Oct1-04 02:25 AM
Garth
12 3,441
I understand it is always possible to diagonalize a metric to the form diag at any given point in spacetime...
Nov27-06 11:18 PM
Chris Hillman
4 3,440
HI, According to GR, gravitation is simply the geometry bending. Does this also apply on Earth? We can stick on...
Jul4-10 08:34 AM
Austin0
42 3,440
To be more exact, does gravitation have a force similar to the other basic forces: electromagnetic, strong and weak...
Jul7-04 11:56 PM
yogi
10 3,439
Hello, My name is Joe and I am a junior in high school. I am taking AP Calculus right now along with a basic physics...
Nov15-07 04:16 PM
Daverz
18 3,439
Le K_0 and K_1 be two inertial frames moving relative to each other with velocity v, from Lorentz transfromation we...
May7-10 07:35 PM
atyy
47 3,438
I found some interesting task about tachyons: "Spaceship A sends to spaceship B ( distance between A and B is...
Oct13-07 06:54 PM
einstein_fan
12 3,436
Some introductory texts and most "popular" literature has not kept up with modern conventions and mathematical...
Jan11-04 10:33 PM
DW
30 3,435
I'm wrapping up 3 weeks on relativity in my freshman calc-based physics course at the community college where I teach....
Nov3-12 10:32 AM
zonde
31 3,434
I know that it took approximately 3 minutes for lights to travel from sun to earth. Let say the sun is gone now. Like...
Sep15-07 03:01 PM
RandallB
21 3,433
There is some discussion about the expansion "of space" in a thread that actually belongs to a different topic so I...
Mar1-04 09:15 PM
yogi
27 3,432
Is it possible for anything in the universe to have absolute zero velocity? I'm not talking about Zero Velocity in...
Nov11-11 08:36 PM
iox108
24 3,432
I read about Einstein's hole argument and about diffeomorphism. Pasive diffeomorphism is changing of coordinate...
Mar25-12 01:02 PM
momchil
13 3,432
Restmass: m_0 = \sqrt{\frac{E^2}{c^4} - \frac{p^2_x}{c^2} - \frac{p^2_y}{c^2} - \frac{p^2_z}{c^2}} Relativistic...
Feb10-10 12:48 AM
dimsun
22 3,432
I'm curious about something - What quantities in physics do you think are "defined" quantities, i.e. quantities which...
Dec6-04 07:14 PM
pervect
10 3,431
Hi, I'm stuggeling trying to understand the physics behind this. I just don't know where to start. Everything I...
May11-05 02:16 AM
JesseM
36 3,428
According to "physics today" ...
May15-12 10:05 AM
Histspec
17 3,428
Hi all, I have been interested in the Theory of Special Relativity for the past few years, and there is something...
Aug31-10 05:38 PM
DaleSpam
6 3,427
Hey everyone, I've searched the threads for an answer to my question but came up short. Basically what I want to know...
Jun10-12 06:11 PM
bobc2
21 3,423
Consider the clocks C(0)(x=0,y=0) ticking and clock C(x,y=0) stopped and fixed to read t=x/c. Source S(0,0) emits a...
Jul21-07 02:50 PM
country boy
18 3,421
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 3,420
I have a problem with relitive motion. If a light source is moving toward me a some high percent of c, the light will...
Aug5-08 09:54 PM
JesseM
27 3,420
Hello all, I am new to the Forum and have no formal Physics training. I have an interest in the subject mainly due...
Oct8-09 06:32 PM
DaveC426913
16 3,420
Sorry if this has been asked, but I did a search and didn't find a relating topic. This thought came to me a few...
Oct24-09 09:58 PM
pervect
45 3,420
I recently read somewhere that speed of light is faster in cesium vapors. It is described as leaving the cesium...
Aug28-10 02:32 PM
bcrowell
5 3,420
I've heard that if the speed of light were to change there would be no effect on the universe because changing it...
Feb2-08 06:41 PM
rbj
22 3,419
http://www.simplegravity.com/images/MichelsonMorley.jpg I think General Relativity would argue that the light...
Sep22-09 09:34 AM
A.T.
6 3,417
Let me know if I've got this right. If there is no absolute rest and everything is relative then everything is moving...
Jan31-10 05:56 AM
ZapperZ
20 3,417
Hello, I don't understand what is the difference between. e.g. the (1,1)-tensor T_{a}^{b} and T^{b}_{a}, i.e. when...
Feb3-09 09:20 AM
robphy
10 3,414
It is my understanding that the velocity of gravity is assumed to be that of electromagnetic velocity i.e. c in...
Jul5-08 09:52 AM
Alex_B
9 3,413
The cosmological redshift can be understood in terms of time dilation. In an expanding Universe light travels on a...
Aug8-13 02:01 PM
Drakkith
45 3,412
I would appreciate if some learned folk could answer these questions to increase my understanding. 1. Does GR...
Nov9-07 12:32 AM
robphy
18 3,411
So I have been wondering about something, this is completely theoretical obviously you cannot sit on a photon but...
Jan2-11 05:13 PM
tunkcart
14 3,411

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