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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
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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
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If gravity waves are supposed to propagate at c, how could the theoretical warp drive wave propagate at greater than...
Sep15-13 06:51 AM
Vanadium 50
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A typical formulation of the Einstein equations is R_{\mu\nu}-\frac{1}{2}Rg_{\mu\nu}+\Lambda g_{\mu\nu}=\frac{8\pi...
Sep15-13 12:15 AM
WannabeNewton
1 558
Given g=\det(g_{\mu\nu}), I find that \frac{\partial g}{\partial g^{\mu\nu}}=-gg_{\mu\nu} Can someone confirm...
Sep14-13 03:46 PM
Bill_K
1 443
As I see,I will show you something and I want to explain me who has right. For example into the run a human walk...
Sep14-13 09:30 AM
ZapperZ
22 1,205
http://en.wikipedia.org/wiki/Twin_paradox I read a little bit about this, and am a little bit confused. I always...
Sep14-13 06:57 AM
DaleSpam
4 550
Someone published a simple computation of the relativistic shift in Mercury's perihelion (over and above classical,...
Sep13-13 08:55 PM
atyy
1 443
A long time ago I visualized mass accelerated to the speed of light(or theoretical maximum to this speed) as an...
Sep13-13 03:33 PM
bizzder
6 428
The CMB used to be gamma rays, right? And now it's microwaves - more redder energy: so where did the rest of the...
Sep13-13 08:06 AM
Naty1
18 1,350
The contra-variant transform seems to be defined by the differential transform from calculus. ...
Sep13-13 07:34 AM
HallsofIvy
1 453
If light takes 1 year to reach a destination, and it takes a ship 2 years to reach the same destination, how fast is...
Sep12-13 01:46 PM
ghwellsjr
8 852
Can anyone help me with this thought experiment. I have a spaceship moving at very close to the speed of light....
Sep12-13 10:36 AM
ghwellsjr
13 618
General Relativity says that every object that has mass make a curvation to space-time. Ι want to ask from what...
Sep12-13 06:47 AM
DaleSpam
1 435
My first of many GR questions :cool:: If electromagnetism can be incorporated into the standard model, where I...
Sep11-13 07:10 PM
atyy
7 519
Hi, I am having problems in constructing a stress-energy tensor representing a constant magnetic field Bz in the...
Sep11-13 04:38 PM
PeterDonis
12 655
I have a question, my bestfriends dad said that if we were driving at 70 mph and then honked the horn, the sound would...
Sep11-13 01:29 PM
Nugatory
3 601
explain it like im 12 years old.
Sep10-13 10:34 AM
jtbell
6 614
I read an article a while back, I can't seem to find it now, that stated that photons can deteriorate into smaller...
Sep10-13 09:00 AM
Naty1
13 893
I know this is a really "dumb" question but I was thinking about the time continuem that moves from left to right...
Sep9-13 02:37 PM
PeterDonis
11 801
It has been said that special relativity calls for light's one-way speed to be exactly c per all inertial coordinate...
Sep8-13 09:11 PM
DaleSpam
49 2,716
Hi, Consider two fixed points A and B in a frame S. In this frame a person P moves towards the point A and does an...
Sep8-13 02:38 PM
PAllen
8 568
Hi, Consider an observer S pushing a fork towards a material x-axis as seen in the figure below According to...
Sep8-13 01:13 PM
bgq
20 1,180
There is a static spherically symmetric perfect fluid solution of the EFE where the energy-momentum tensor is...
Sep8-13 04:22 AM
Mentz114
2 490
Hi, I'm new and uneducated. Would like to know how to reconcile space-time being considered asymptotically flat near...
Sep7-13 10:43 PM
jbunch
14 589
In a different thread the Herglotz Noether theorem was brought up and it was mentioned that this theory implies it is...
Sep7-13 08:01 PM
yuiop
80 3,549
Hi guys! I need help on a problem from one of my GR texts. Suppose that ##\xi^a## is a killing vector field and...
Sep7-13 03:35 PM
WannabeNewton
4 755
The general field equation for GR is Rab - 1/2 gab R = 8πTab where I am setting G = 1 and c = 1. Also, the...
Sep7-13 01:25 PM
Thinkor
3 495
Hi! I am having the following action with an induced metric and a scalar field: $$S = \int dr d^dx \, \left(...
Sep7-13 09:44 AM
llorgos
0 355
Galilean principle of relativity is for sure not absolutely true, isn't it? Say one has a pool full of water within...
Sep7-13 06:37 AM
DaleSpam
44 1,659
If you had two synchronized clocks in two side by side elevators, and one sat on the surface of the earth in 1 g for...
Sep6-13 02:49 PM
Nugatory
14 764
Hi.. I was reading about the special theory of relativity, and was thinking about interactions and speed of source...
Sep6-13 02:16 PM
harrylin
9 639
Hello PF members! First of all, let me start off my post by admitting that I have created a duplicate account....
Sep5-13 10:34 AM
berkeman
3 668
The presence of a cosmic string does not lead to gravitational attraction of a particle placed some distance away from...
Sep5-13 08:49 AM
Bill_K
1 470
I'll begin by admitting that I did not scroll through the entire list of threads to see if there was already a post...
Sep5-13 02:27 AM
RiccardoVen
15 935
Ideal rulers in relativity are generally assumed to be consistent with radar measurements. The modern definition of...
Sep5-13 01:27 AM
pervect
8 545
In the equation x = vt it is generally accepted that x and v are vectors and that they have a common eigenvector....
Sep4-13 06:37 PM
WannabeNewton
21 1,328
I have a (probably trivial) question about coordinate charts. I've been studying Sean Carroll's lecture notes on...
Sep4-13 05:25 PM
Ibix
2 454
Can anyone explain about time dilation in a simple way? I am confused about these facts: 1) If an observer A...
Sep4-13 04:40 PM
Nugatory
9 570
Can anyone give me a geometrical interpretation of the weyl curvature tensor?
Sep4-13 11:44 AM
WannabeNewton
7 520
I have two questions having to do with the Lorentz transformation for the time...some preamble first: The Lorentz...
Sep4-13 08:41 AM
ghwellsjr
2 508
Gravity is zero at the center of the earth. how come the same set of equations predict the gravity to be infinity at...
Sep4-13 03:48 AM
Sasikanth9
1 412

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