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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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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 37,149
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Feb23-13 08:40 AM
ZapperZ
1 37,394
Hi, I recently completed a course on Electrodynamics, with a short introduction to special relativity (and E/B...
Apr10-10 11:43 AM
utesfan100
4 1,301
In SR, Four velocity was the proper time derivative of a world line, do we have to take the covariant derivative...
Jul15-12 09:37 PM
Chestermiller
16 1,266
if the magnitude of the four velocity vector is always c then it can be rewritten in polar form with 3 numbers giving...
Jul29-11 10:01 PM
Chestermiller
2 3,206
Hello PF community! I'm having trouble with what strikes me as an inconsistency within conservation of energy,...
Dec1-11 11:28 PM
n+1
4 1,565
I've searched all over the web to get an answer for this, to no avail. So I decided to ask this question here and I'm...
Apr27-10 05:34 AM
nik21bigbang
10 13,732
If in some frame I define a geometrical object as having 3 space components, how do I then find the time component...
Nov5-09 07:02 PM
jason12345
3 823
I am trying to get a handle on four-vectors. I see that there is a thing called a four-potential, a four-gradient, and...
Nov17-06 10:36 AM
Daverz
4 2,499
The four-velocity as defined for example here, is given by U=\gamma(c,\bar{u}) but I get ...
Mar13-12 08:08 AM
PAllen
19 1,318
In another thread Naty1 said:The Wikipedia pages on four-vectors and related concepts (four-velocity, four-momentum,...
Sep8-09 06:57 AM
Austin0
50 5,681
somebody know about this terms: "timelike, spacelike or lightlike" they often are used in relativistic electrodynamic...
Sep5-05 06:55 AM
DrGreg
3 1,288
From Schutz's A First Course in General Relativity "A particle of rest mass m moves with velocity v in the x...
Apr9-10 09:00 PM
schwarzschild
3 944
Hi, In Fourier analysis, we can decompose a function into sine waves with different wavenumbers that travel at...
Oct28-11 01:09 PM
Ben Niehoff
6 1,936
I'm a little confused by extra dimensions. People seem to say different things about the 'extra dimensions. Everyone...
Nov19-13 11:40 AM
gabriel.dac
2 484
I have read speculations that (1) the cosmic microwave background radiation has a fractal distribution (non-integral...
Sep12-09 09:55 AM
nomadreid
2 1,087
Suppose, a long object is at rest in S frame. There is A (On the long object) and B (Near the long object, on the...
Apr3-12 04:25 AM
harrylin
29 2,574
As far as I understand, a spaceship going around rotating black hole should gain additional acceleration due to frame...
Mar12-13 06:27 PM
Bill_K
6 722
What is Frame Draggin, and Gravity Waves where did the idea of them come from in GR?
Oct24-04 04:01 PM
Chronos
4 1,287
Hi, I am interested in the issue of frame dragging used in a number of galactic rotation models. However, I wanted to...
Oct17-12 05:42 AM
mysearch
8 1,272
Can frame dragging around a black hole induce closed timelike curves (CTC)?
Aug3-11 07:56 PM
Chalnoth
9 1,734
I'm trying to wrap my head around how rotational frame dragging affects the centrifugal force of a massive, rotating...
Jan28-10 02:09 PM
PhilDSP
5 2,139
Is there a simple mathematical relation between the speed at which the Earth spins and the magnitude of the...
Aug22-04 09:18 AM
pmb_phy
1 1,441
I just read in a popular magazine about the satellite to be launched in order to measure the frame dragging by a...
Dec17-03 03:42 PM
selfAdjoint
5 2,470
News story this morning. http://www.msnbc.msn.com/id/6290610/. Effect detected by observing two satellites over a...
Oct21-09 10:24 AM
peron
8 2,239
From MSNBC: GR confirmed again as gravity measurements reflect the predicted space-time dragging effect caused by...
Oct22-04 11:44 AM
Phobos
1 1,034
I had a question that I was hoping someone could answer for me. If light passes next to a massive rotating object...
Oct29-07 07:56 PM
cesiumfrog
3 2,458
Does light beam create linear frame fragging around it? If answer is positive, can light become 'tired' going thru...
Feb22-11 12:33 PM
Dmitry67
4 965
Objects smaller than black holes, by mass can still drag space along with their rotation. I picture this like a plate...
Nov27-10 02:10 PM
Passionflower
3 1,123
What is the difference, if any, between frame fields and coordinate bases?
May3-07 12:17 PM
masudr
4 3,203
It seems clear that all inertial frames would agree that a frame was accelerating based on instantaneous (short...
Jul3-10 03:49 PM
djy
20 1,478
given a frame of reference s In General Relativity in wich you meassure an interval of space dx, could we have another...
Aug25-04 06:36 PM
pervect
5 1,780
Let's consider flat 4D Minkowski spacetime. Is it possible to define (local) coordinate system for any observer (its...
May10-10 07:40 PM
starthaus
4 742
I've been giving some thought to the new scientist article about the equivalence principle. What initially seems like...
Feb14-13 07:18 AM
brenan
2 463
Let's suppose that I am the Captain at a space dock sitting in interstellar space. My crew decides to go on a trip in...
Dec31-09 05:56 AM
HallsofIvy
1 923
I've been learning about 4-velocity and all the "proper" 4-vectors recently, and if I understand correctly, proper...
Mar6-11 12:35 PM
EricTheWizard
2 1,932
I heard that some kind of experiment on frame-dragging was in process (or is that finished?). What was the outcome?...
Aug1-06 02:31 PM
pervect
7 1,497
HI, I've been mulling over the derivation of the Lorentz factor gamma in my head for some time now & had worried about...
Jan11-10 10:40 AM
yuiop
7 1,495
I've read about 'ergosphere' in wiki and surprised at the information presented that ergospheres around very fast...
Oct15-10 12:39 AM
PAllen
7 893
Hello I am having problems in GR because I do not understand how observations frames work in this theory. I have a few...
Apr7-13 06:40 AM
Agerhell
8 597
I'm not going lie I don't know too much about relativity, though I do understand it. I haven't even gone to college...
Aug1-08 12:27 PM
JesseM
37 3,732
I keep hearing how motion only exists relative to something else. But what if there is some object in space, and it is...
Jan18-09 09:28 PM
JesseM
3 932

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