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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 42,287
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 41,917
We have the (I think FRW) metric in the coordinates y^{0}=t,~~y^{1}=\psi,~~y^{2}=\theta,~~y^{3}=\varphi ...
Jun24-14 04:32 AM
ChrisVer
5 910
I only understand mass and energy according to Newtonian mechanics, Where mass is the resistance of a body to...
Jun23-14 02:06 PM
pervect
3 713
It is well-known that Newtonian's law of gravitation \Phi(\vec{r}) = -\frac{Gm}{|\vec{r} - \vec{a}|} for the...
Jun23-14 07:45 AM
stevendaryl
20 1,954
A lorentz transformed electric field has it's own name. It's called a magnetic field. That makes me wonder if there...
Jun22-14 10:52 PM
pervect
4 633
Hello, I have a doubt regarding the postulates of SR. The two postulates, according to Schutz, are: 1) No...
Jun21-14 08:33 PM
Meir Achuz
122 8,374
Under a change of variables: x^{\mu} \rightarrow x^{\mu}+ \delta x^{\mu} How can I see how the determinant of the...
Jun21-14 06:27 PM
Matterwave
1 480
What is stability of Hawking Mass and how to calculate it? Any references will be appreciated. Thanks
Jun21-14 01:49 AM
Haelfix
9 684
Both the Newtonian theory on gravitation and the General theory of Relativity predict a change in the direction of a...
Jun20-14 06:17 PM
Devin
5 652
I was browsing through old threads and a user named universal_101 kept asking about why we can use muons as a direct...
Jun20-14 04:48 PM
Nugatory
1 504
Picture: - - - ---------------------------------- p ->
Jun19-14 04:04 PM
PeterDonis
1 408
My question is essentially a variation of the Ehrenfest paradox in SR. But hopefully with some experimental data. ...
Jun18-14 03:28 PM
WannabeNewton
6 613
Hi, I understand the definition of stationary as existence of a timelike Killing vector field and as a result the...
Jun18-14 09:23 AM
WannabeNewton
23 1,589
This question needs to be framed: We track time at the Earth's surface using atomic clocks. We know that objects...
Jun16-14 09:00 PM
WannabeNewton
14 960
Hello, I have two problems. I'm going through the Classical Theory of Fields by Landau/Lifshitz and in Section...
Jun16-14 05:54 PM
electricspit
4 453
If two photons ( A and B ) are traveling in opposite directions from a point in a vacuum will the relative speed of...
Jun16-14 04:39 PM
ghwellsjr
9 592
i have read that existence of photons as a mass less particles came from the energy momentum equation. E^2 =...
Jun16-14 01:13 PM
Goodver
4 609
Something thats been bugging me, but unable to find an answer for.. The speed of light (in a vacuum) is absolute,...
Jun15-14 01:48 PM
DaleSpam
33 1,215
The stress-energy tensor is an actual tensor, i.e., under a spacetime parity transformation it stays the same, which...
Jun15-14 01:45 PM
bcrowell
4 528
Consider an unbreakable nail. A nail of length 10cm moving at 0.866c. If i stop the nail by hitting its cap, would...
Jun15-14 01:44 PM
pervect
8 384
I really don't understand what it is and what is the use of constant, like in this equation of transformation. ...
Jun15-14 10:14 AM
jtbell
4 369
As far as I'm informed time slows down the lower the gravity and the faster we move. Let's say I go out in space with...
Jun15-14 12:38 AM
Nugatory
7 463
From my understanding, an arbitrary (0,N) tensor can be expressed in terms of its components and the tensor products...
Jun14-14 11:38 PM
guitarphysics
4 438
I have this crazy and goofy dream to construct an artificial black hole. Not a crude analogue, but the actual...
Jun14-14 06:06 PM
putongren
22 1,234
To=(time of moving object.) T=(Time of standing object.) ^=power of number. sqrt=square of number.(x^1/2) Law...
Jun14-14 01:14 PM
Hepic
7 460
Hi everyone: I just started to learn special relativity but totally being confused about "velocity", "momentum" and...
Jun14-14 06:49 AM
Jeffrey Yang
8 526
Well I just have one question. Is the existence of wormholes really possible or not? I've only seen them appearing in...
Jun13-14 08:23 PM
HarryRool
40 1,672
So light can be bent by a gravitational field, and follows the curvature of spacetime. does light have a gravity field...
Jun13-14 05:04 PM
Drakkith
1 341
It is very important for me to know how scientists detect the speed of light in details...because there is something...
Jun13-14 03:50 PM
PeterDonis
27 963
So, this has really stirred my interest. To be clear, I'm not citing these as sources, simply linking for discussion;...
Jun12-14 07:37 PM
Simon Bridge
9 1,013
Hey guys, I was recently thinking about theoretical ways to accelerate objects (spacecraft) and I had the idea that...
Jun12-14 03:30 PM
DaleSpam
3 444
I know that you probably get tired of weird questions like this so I apologize in advance. I was thinking about...
Jun12-14 03:23 PM
pervect
12 512
Out of interest I'm studying a book "A first course in general relativity" which is a great book in my opinion because...
Jun12-14 10:28 AM
PeterDonis
8 470
I read recently that "...at present only GR theory predicts the required 13 parameters for agreement with critical...
Jun12-14 09:57 AM
WannabeNewton
1 259
So, if I travel in a ship at light speed in a line from earth to space for 10 minutes. Than turn around and travel...
Jun11-14 10:21 PM
PeterDonis
13 499
I've been reading Dr. Harold G. White's work on recent developments in Warp Field Mechanics, and thought up the...
Jun11-14 06:20 PM
PeterDonis
1 309
Hi, I'm trying to understand what the nature of gravity is. I know it is a force, and I know that heavy objects tend...
Jun11-14 05:32 PM
pervect
16 1,058
A interesting question came up to my mind, and it's related to the concept of different synchonization methods. If we...
Jun11-14 08:01 AM
WannabeNewton
15 641
It is often said that we basically live in the past, since it takes time for light to travel from objects to our eyes...
Jun10-14 12:40 PM
pervect
35 1,018
In, BBC - Wonders of Universe, Professor Brian Cox explains that universe is stretching and the space that we live in...
Jun10-14 05:36 AM
phinds
1 410
I have used GRTensorII and Cadabra for some time. And I think Cadabra have great potential for GR. But the current...
Jun10-14 04:24 AM
shadi_s10
16 1,531

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