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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
ZapperZ
1 37,364
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 37,126
I recently read Griffiths paper on Hidden momentum, and still didn't found it complete. Following is the short...
T 06:31 AM
Jonathan Scott
31 687
Hi, from what I understand about the twin paradox, Is the resolution essentially that since the traveling twin...
Y 11:28 PM
russ_watters
4 194
Hello, I was unable to find a similar thread, so I would like to ask about this myself. I have several textbooks on...
Y 11:06 PM
Nugatory
21 605
Light can be affected by gravity and as I understand it light can be a source of gravitational effects on other...
Y 02:19 PM
PAllen
15 524
Here is my basic question: Lets say we have a massless charged shell with charge q and radius R. Is there some R...
Y 01:36 PM
PeterDonis
20 358
This has bothered me for a long time. I understand that time varies with velocity relative to the observer. But what...
Y 06:33 AM
Nugatory
9 253
Suppose a black hole travels at something like v = 0.999999999c relative to some observer. Does the black hole's event...
Y 04:46 AM
martinbn
6 253
In another thread Wannabenewton mentioned: and gave this reference: Until WBN mentioned it, I had never given...
Y 01:44 AM
WannabeNewton
199 7,252
Hello everyone. Thought of this question while at work. I've read the universe appeared out of nothing and expanded...
Y 12:08 AM
Mordred
9 220
Hi, I know there are already other posts about extremal aging, but all of them are actually closed and none of...
Apr15-14 04:57 PM
RiccardoVen
6 219
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Hello, Im interested in surface gravity of Kerr black hole it means, I need to find killing vector for Kerr which...
Apr15-14 09:33 AM
Vrbic
2 153
Please help me to understand. In theory with a powerfull enough ship a space man can travel to a distant star, say...
Apr15-14 09:09 AM
lowemack
18 512
Hello, all. I've been attempting to understand relativity the past week. I've also been reading about quantum...
Apr15-14 02:06 AM
bhobba
5 257
So, there's a paper here that I'm a bit confused about. On pages 3 and 4, it talks about energy density magnitude and...
Apr14-14 08:22 PM
MattRob
0 199
If I am not mistaken, the change of the minkowski metric to: n_{\mu\nu} \rightarrow g_{\mu\nu}(x) will violate the...
Apr14-14 08:10 PM
Geometry_dude
4 154
One problem in understanding Special Relativity is that it is intuitively hard to agree with relative simultaneity. ...
Apr14-14 05:15 PM
andromeda
38 1,338
"... Supposing that the bodies act upon the surrounding space causing curving of the same, it appears to my simple...
Apr14-14 04:13 PM
DaleSpam
10 328
I have a question on the tension between special relativity and quantum mechanics, so please correct the category if...
Apr14-14 04:03 PM
DaleSpam
17 531
I'm starting with the Einstein box. It's the one that's floating in space and has photons moving from one side to the...
Apr14-14 08:48 AM
UltrafastPED
17 398
Hi Bear with my possible ignorant. I am puzzled over this dilemma. If General Relativity states that gravity is the...
Apr14-14 07:27 AM
Mordred
5 224
My question is the following: Have there ever been any experimental tests of the Einstein equation (a.k.a. Einstein...
Apr13-14 05:33 PM
Geometry_dude
2 234
Suppose that you have a region of space with no fields and the only matter is in the form of a cloud of point-masses....
Apr13-14 11:54 AM
WannabeNewton
2 243
... I gained most of my elementary understanding of Special Relativity (SR) from books by Isaac Asimov. I made the...
Apr13-14 09:14 AM
Wes Tausend
29 792
I'm sticking my neck out because I just worked this out and may regret this post later. The spaceship paradox...
Apr12-14 06:12 PM
Mentz114
133 4,961
This came up while I was trying to research the interaction of an electromagnetic plane wave with a dielectric slab,...
Apr12-14 04:16 PM
universal_101
2 191
Someone on another forum shared with me that a 6L6 vacuum tube exhibits a blue dot when in operation that is supposed...
Apr12-14 01:44 PM
nsaspook
2 257
Hello everyone, I have recently read a puzzling statement on my Electromagnetism (Chapter on Special Relativity)...
Apr12-14 11:45 AM
Zag
15 340
Neat "rubber sheet" analogy of the curvature of space time on YouTube. Skip to 5:57 for orbits around the Earth moon...
Apr11-14 02:46 PM
A.T.
1 241
good day , I am not a professional , but I read that in according to laws of physics it is not possible to go...
Apr10-14 11:20 PM
Wes Tausend
5 286
I started attending to GR lectures, and there we referred to an intelingent beetle living on a 2D flat space and...
Apr10-14 10:54 AM
ChrisVer
0 175
Given that distance between two points can vary depending on your frame of reference wouldn't that mean that the...
Apr10-14 04:59 AM
ghwellsjr
5 274
Lately, I have been giving a lot of thought to whether or not photons would have mass or not. I know most on here an...
Apr9-14 11:33 PM
Matterwave
13 528
I have been trying to work out the solutions to a homogenous line universe using special relativity, and have found...
Apr9-14 10:17 PM
122520253025
2 294
Hey guys based on the Einstein train thought experiment we can say that different inertial frames disagree on...
Apr9-14 04:49 PM
analyst5
20 801
In a video on the youtube channel "Veritasium", it is explained that an electric field and a magnetic field is...
Apr9-14 01:37 PM
jartsa
14 456
Suppose we do a constant Jacobian transformation (which is not Lorentz) of a SR (inertial) frame, by using four...
Apr9-14 12:01 PM
hwl
2 410
Kevin Brown, in his excellent book "Reflections on Relativity" p. 409, "immediately" integrates 2 geodesic equations:...
Apr9-14 07:35 AM
Bill_K
1 208
I've been told on many occasions that light will always be measured at the same speed regardless of measuring...
Apr8-14 11:01 PM
ghwellsjr
15 941
Dear, If i start from the Einstein Hilbert ACtion and apply the usual Noether rules (as we use them on flat...
Apr8-14 09:42 PM
pervect
2 246

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