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Mar11-14 10:20 AM bcrowell 

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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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Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Feb23-13 08:40 AM
ZapperZ
1 37,397
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 37,154
Hello, I recently read about a photon's point of view according to relativity(which is a fascinating thing for a high...
Aug14-13 03:38 AM
BruceW
38 2,469
When media reports a supernova it sounds like it happened just a while ago despite the photon stream came from say 10...
Aug14-13 01:52 AM
Romulo Binuya
8 564
\partialμ\phi\partialμ\phi and \partialμ\partialμ\phi with \phi(x) a scalar field
Aug13-13 04:59 PM
Mentz114
6 483
I want to be able to formulate x^{n} coordinate system. x^{n} =(x^{1}, x^{2}, x^{3}, x^{4}) How do you do this when...
Aug13-13 10:18 AM
ProfDawgstein
1 353
In order to understand how related are the theories of General Relativity and Electromagnetism, I am looking at the...
Aug13-13 09:27 AM
nix00
7 661
Hello PF: I noticed a thread on PF in which TOM STOER and others were discussing how to calculate the redshift...
Aug13-13 06:26 AM
Mentz114
12 240
Hi, Does the magnitude of the force change when the frame moves with a high speed with respect to another frame at...
Aug13-13 02:47 AM
harrylin
6 543
Is the Milky Way Galaxy non-rotating or rotating? Which metric is best suited: Schwarzschild or the Kerr Metric,...
Aug12-13 11:57 PM
Mentz114
7 421
We sit in a room. I see you and you see me. We both understand we are seeing each other as we "were" a small time...
Aug12-13 04:35 PM
DaleSpam
35 2,146
When I first learnt time dilation I was given this equation proven using the light clock example. t = γt' ...
Aug12-13 03:34 PM
ghwellsjr
34 1,667
The geodesic equation follows from vanishing variation ##\delta S = 0## with ##S = \int_C ds = \int_a^b dt...
Aug12-13 08:20 AM
tom.stoer
2 398
How could you tell in an experiment which was happening?
Aug12-13 07:53 AM
DaleSpam
10 726
I remember when I took E&M my teacher said that special relativity was built into Maxwells equations. Lets look at...
Aug12-13 04:09 AM
BruceW
6 619
I am wondering as to how many metrics have been discovered that obey all the laws of General Relativity? I am...
Aug11-13 08:04 PM
PAllen
7 564
I always try to assume that pretty much anything I think of has been thought of before, so I am relatively sure that...
Aug10-13 06:37 PM
arydberg
8 581
Hi everyone. I'd like you to help me make sense of a question I found about the Michelson Morley experiment. This is...
Aug10-13 05:36 PM
Simon Bridge
7 567
hi In a local inertial frame with g_{ij}=\eta_{ij} and \Gamma^i_{jk}=0. why in such a frame, curvature tensor isn't...
Aug10-13 02:03 PM
stevendaryl
22 1,057
hi i read an article by S.carlip about quantum gravity, arXiv:gr-qc/0108040v1 , in this article carlip stated: why...
Aug10-13 12:40 PM
Bill_K
1 369
I'm trying to make a chart that displays how much energy it takes a rocket with x mass to reach Y factors of...
Aug10-13 12:45 AM
Simon Bridge
10 660
Apologies if this is in the wrong forum: I am reading Biocentrism by Robert Lanza, and one of his arguments is that...
Aug9-13 07:55 PM
DaleSpam
2 426
hello In MTW excercise 22.6, given a fluid 4-velocity u, why the expression : ∇.u is called an expansion of the...
Aug9-13 01:38 PM
WannabeNewton
9 509
I was working on the derivation of the riemann tensor and got this (1) ##\Gamma^{\lambda}_{\ \alpha\mu}...
Aug9-13 12:53 PM
ProfDawgstein
3 473
I have a short question about the derivative of a given EM-Tensor. ##\rho## = mass density ##U^\mu## = 4 velocity...
Aug9-13 08:27 AM
ProfDawgstein
21 1,039
Here is an anecdote about Arthur Eddington: So Eddington thought only he and Einstein understood GR, at some point...
Aug8-13 04:38 PM
Jolb
24 1,246
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 2,394
In Stephane Hawking's book-A Brief History of Time-Stephane says that in the past they used to believe thatthe speed...
Aug8-13 11:06 AM
Harry Wilson
27 1,213
The following is a shot in the dark. Say we have two perfectly reflecting mirrors with equal mass. Which are...
Aug8-13 05:06 AM
arnesinnema
7 533
I'm a little confused about when I would use the 4-velocity for a particle on a world line. I got confused the other...
Aug8-13 02:06 AM
WannabeNewton
1 398
In GR, the geodesic equation for a test particle can be seen in 2 ways. (1) It is a fundamental postulate...
Aug7-13 11:46 PM
WannabeNewton
7 730
For outside observer, an object falling into black hole seems to freeze at event horizon and never cross the boundary...
Aug6-13 09:17 PM
WannabeNewton
4 485
Hi, I confused about the relationship between light and c on the one hand and massless particles and c on the other. ...
Aug6-13 12:19 PM
phinds
6 619
In his paper, Chou et. al., 2010 has demonstrated that an atomic clock at the height of our head ticks faster than an...
Aug6-13 02:26 AM
harrylin
138 4,914
Hi everyone! I was thinking about gravitational waves and gravitons and I realized that I did not fully understand the...
Aug5-13 01:09 PM
The_Duck
11 902
Einstein reconfirmed "In the new Kepler study, scientists used the gravitational lensing to determine the mass of...
Aug4-13 07:03 PM
Mentz114
4 969
I would like to have a Star orbiting a Schwarzschild Black Hole if the the velocity and position vectors in the galaxy...
Aug4-13 10:04 AM
DaleSpam
10 582
At the moment I'm reading a little bit about the connection between the Lorentz group SO^{+}(1,3) and its covering...
Aug3-13 10:56 AM
parton
0 412
In the regular hall effect we calculate like this F=qE=qvB then E=vB , now we assume our conductor has width d so...
Aug3-13 10:40 AM
Nugatory
4 628
Iíve got a question. Say we have a medium traveling through a pipe at speed v. The soundspeed of the medium is vs....
Aug3-13 10:19 AM
ProfDawgstein
1 420
hi some black holes are inner and outer horizon!! what's this means? inner and outer? what happen between them?
Aug3-13 08:13 AM
Naty1
3 856
Hello Forum I have constructing a Michelson Interferometer using sodium light. For viewing the fringes, I have used...
Aug2-13 10:51 PM
itsnaresh
2 509

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