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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
1 37,382
The section of the Usenet Physics FAQ titled "Experimental Basis of Special Relativity" has been cited here many...
Dec31-07 02:06 AM
0 37,141
Do wormholes really exist in spacetime? I mean, as a race we need to colonize the rest of the galaxy before too long...
Feb6-08 10:15 PM
5 1,893
Hi again. I just re-read the paper from 1920 where Einstein ponders "ether". Based on General Relativity he seemed to...
Feb6-08 08:22 PM
country boy
1 1,379
SR can be used to describe E&M in a local inertial frame, can anyone tell me a book or paper, that describes E&M in a...
Feb5-08 10:26 PM
3 1,199 Would there still be a t axis? ...
Feb5-08 02:37 PM
6 2,440
First I'm not a native English speaker so sorry for grammar errors . Ok lets start my hobby is to learn things and...
Feb5-08 09:36 AM
2 2,059
Hello everyone, Perhaps it has been asked many times in the past, so please forgive me, and I appreciate your...
Feb4-08 01:55 PM
4 1,736
When I was in my late teens I read a book called the "The Dancing Wu Li Masters" by Gary Zukav, (those prepared to...
Feb4-08 09:33 AM
4 1,422
I have a question,why is time and space inseperable,that is,why can't one exist without the other? Oh and I have...
Feb3-08 05:57 PM
Shaun Culver
23 2,467
What is the accepted view of spacetime? Do we think we really live in a four-dimensional spacetime, or is it...
Feb3-08 02:28 PM
2 1,444
Could it be that an observed object moving back in time is indistinguishable from an object moving forward in time? To...
Feb3-08 08:10 AM
16 3,403
I've heard that if the speed of light were to change there would be no effect on the universe because changing it...
Feb2-08 06:41 PM
22 3,106
Hi everyone, If anyone could point me in the right direction with this problem I'd really appreciate it. "Show...
Feb1-08 11:10 PM
2 2,111
Just a thought... Pick a spot/location on the surface of the Earth. Now, the Earth is rotating on its axis and...
Feb1-08 06:30 PM
6 2,344
Are there any differences between a Lorentz scalar quantity or a Lorentz invariant quantity? That sound be stupid but...
Feb1-08 04:25 PM
3 2,197
I read elsewhere that when one travels in a spaceship "very close to the speed of light" that objects behind the ship...
Feb1-08 03:12 PM
12 1,709
Hi, I'm looking for a mathematical formulation of galilean spacetime, i.e. the "essence" of galilean spacetime in...
Feb1-08 01:51 PM
0 1,044
Why were there many good G.R. books published in such a short space of time around '72-'73? Is there a reason?
Feb1-08 09:51 AM
Shaun Culver
0 1,136
Okay, I don't know really if this is the right forum to ask this in, so I apologize if it ain't. I will also add that...
Feb1-08 08:54 AM
8 1,531
At what scale does time dilation manifest itself? Is time dilation dictated only by the velocity of entire large...
Feb1-08 02:59 AM
2 1,085
Photon can be emitted by an electron's changing of its orbit. As we know. photon always travels at speed c, never...
Feb1-08 02:48 AM
16 2,641
What is the physics answer to the question of why light has an invariant speed to anyone and everyone, other than...
Feb1-08 02:29 AM
117 32,911
A warning is often given that if one wants to have a spaceship travelling at relativistic speeds (usually to get to...
Feb1-08 02:25 AM
1 1,542
We all know magnetic fields can be blocked by metal, light can be blocked by non-transparent materials, forces...
Jan31-08 11:41 PM
16 3,746
When tachyons became all the rage, why was the automatic assumption made that, because they seemed to travel faster...
Jan31-08 11:06 PM
21 4,367
You know the 'thought-experiment'....the spacehip travelling at a speed close to the speed of light....where a photon...
Jan31-08 02:52 PM
17 2,485
I understand that a photon has never been known to decay. Is this because, travelling at the speed they do, time has...
Jan31-08 07:14 AM
32 5,755
I haven't seen the twin problem configured this way before. But it seems to me it should lay to rest the argument that...
Jan31-08 03:06 AM
7 1,398
Hey folks, I see a lot of papers where an action is conformally transformed into the Einstein frame. Can...
Jan30-08 10:00 PM
0 1,565
does anyone know where to freely download the essays, published in Annals of Physics, written by Einstein himself...
Jan30-08 09:55 AM
1 1,846
I was wondering if anyone had an explicit form of the hamilton-jacobi equations for GR. I had a little attempt myself...
Jan29-08 11:16 PM
1 1,641
this isn't my explanation, but I was just wondering what others thought: "Einstein's special theory of relativity...
Jan29-08 10:01 PM
2 2,508
Einstien gives the example of an observer riding on the rim of a spinning disc. Using his length contracted rulers he...
Jan29-08 07:38 PM
7 2,397
A.A.Logunov, M.A.Mestvirishvili, Yu.V.Chugreev THE EQUIVALENCE PRINCIPLE...
Jan29-08 01:52 AM
0 1,590
Can somebody please help me with this question? Obviously when we observe an event it has not occured at the time...
Jan28-08 11:53 PM
7 4,614
I have read many NASA history series books on early space missions and none of them mention time dilation. In fact...
Jan28-08 05:51 PM
33 7,281
hi I read a few other post about this but i'm an engineer, not a physicist, not a genius and didn't get much wiser....
Jan28-08 03:03 PM
Doc Al
80 45,915
What exactly are "preferred coordinates"? Or a "preferred coordinate system"?
Jan28-08 01:48 PM
9 2,122
obviously the equations of tidal forces and geodesic deviation are very similar to lead one to motivate yourself to...
Jan27-08 08:17 PM
3 1,519
Hi I am just wondering if E = mc^2 then wouldn't it also be correct to say 1/2mv^2=mc^2 since E is kinetic energy....
Jan27-08 07:06 AM
5 2,666
Hi all, I am very new to this forum so please let me know if I have posted this in the wrong place, and thanks in...
Jan27-08 03:17 AM
2 1,379

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