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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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Feb23-13 08:40 AM
ZapperZ
1 37,495
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 37,231
In trying to understand relativity, I once read a statement that even travelling at the speed of light, an emitted...
Aug15-13 07:23 PM
pervect
13 794
There is a closed thread c squared = e/m. I am piggy-backing off of that discussion. c is a constant, and thus so is c...
Aug15-13 03:14 PM
prasa043
2 465
Mod note: Posts split off from http://www.physicsforums.com/showthread.php?p=4468795 Hi, WN, might the OP be...
Aug15-13 03:09 PM
PeterDonis
150 3,388
I was working on an exercise in Ohanian's book. I guess he means charge conservation, but wrote ##j^\nu =...
Aug15-13 02:50 PM
WannabeNewton
15 595
I was laying in bed and a thought came to me. Im sure this has been explored already so I wanted to know what the...
Aug15-13 01:03 PM
HallsofIvy
61 7,405
I struggled long and hard to resist the idea that Alice observes nothing special as she falls into the Schwarzschild...
Aug15-13 10:19 AM
PeterDonis
3 451
Hello all, so lets suppose a photon is being gravitationally red or blue shifted changing its frequency which...
Aug15-13 07:11 AM
deadscientist
3 398
What is
Aug15-13 01:46 AM
micromass
1 353
Hi! I am really bad at physics so bear with me... I saw some very interesting 3 hour physics-marathon on TV the...
Aug14-13 07:37 PM
rogerk8
41 2,047
If I were to hold a tennis ball out at arm's length, and release it, we all know it would fall due to gravitational...
Aug14-13 07:34 PM
LuckyNate
6 531
On page 56 of "Theory of Spinors", Eq. (3.84a), Carmeli gives the formula for the Lorentz matrix in terms of Pauli...
Aug14-13 02:37 PM
arkajad
80 3,628
Hi guys & girls, I have a question regarding travelling faster than the speed of light, a small theory, which I am...
Aug14-13 01:48 PM
mfb
14 631
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 2,490
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
6 492
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
1 354
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
7 664
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
12 241
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
6 550
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
7 429
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 2,187
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 1,686
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
2 400
How could you tell in an experiment which was happening?
Aug12-13 07:53 AM
DaleSpam
10 739
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
6 628
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
7 571
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
8 583
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
7 578
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 1,072
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
1 374
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
10 667
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
2 430
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
9 517
I was working on the derivation of the riemann tensor and got this (1) ##\Gamma^{\lambda}_{\ \alpha\mu}...
Aug9-13 12:53 PM
ProfDawgstein
3 477
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 1,049
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 1,265
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 2,434
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 1,234
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
7 539
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
1 400

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