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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 37,485
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 37,220
I am trying to get another insight in what I think is currently for me a contradiction. I have searched the forums,...
Y 11:33 PM
ANvH
15 258
I recently read Griffiths paper on Hidden momentum, and still didn't found it complete. Following is the short...
Y 02:43 PM
TrickyDicky
58 1,511
What is the shape of an "isodistance" volume from the point of view of an observer traveling at relativistic speeds?...
Y 11:57 AM
BitWiz
23 463
Let's suppose that we have a rod which is 2 meters long in its rest frame. Its rest length can be defined as a set of...
Y 09:35 AM
DaleSpam
16 443
With Δt = γ ( Δt' + v Δx' ) For calculating delta t for stationary twin with values of traveling twin. Is it...
Y 02:04 AM
ghwellsjr
8 386
Hello Physics Forums! I'll try to cut right to the chase. I'm studying both length contraction and time dilation in...
Apr22-14 11:45 PM
ghwellsjr
2 155
quote from wikipedia: "According to the special theory of relativity, it is impossible to say in an absolute sense...
Apr22-14 11:29 PM
ghwellsjr
15 443
Hey all, first I just want to say that I am by no means a physicist - just someone that is very interested in physics,...
Apr22-14 08:21 PM
ghwellsjr
1 196
Hello, I was unable to find a similar thread, so I would like to ask about this myself. I have several textbooks on...
Apr22-14 05:45 PM
Wes Tausend
34 1,219
As all of you, I like to think about why and how Things happen; and as all of you I often feel frustrated by just how...
Apr21-14 07:07 AM
Fredrik
2 178
Since many authors call simultaneity between events a convention, and that under the specific set of rules we may...
Apr21-14 02:39 AM
andromeda
22 513
Given an ideal rocket in a friction-free, gravity-free environment: A precise amount of energy E is applied to...
Apr20-14 08:25 PM
PeterDonis
8 253
Hi, from what I understand about the twin paradox, Is the resolution essentially that since the traveling twin...
Apr20-14 04:17 AM
ghwellsjr
21 687
Hey everyone. I found a pretty good paper on Kaluza–Klein reduction here. However, I am having a hard time deriving...
Apr19-14 11:55 AM
smiller
0 200
Please help me to understand. In theory with a powerfull enough ship a space man can travel to a distant star, say...
Apr18-14 06:49 PM
ghwellsjr
19 776
Suppose you were to board a ship on Earth departing for a star system 1,000 light years away. You accelerate at 1g...
Apr18-14 03:06 PM
Camel_City
2 190
Light can be affected by gravity and as I understand it light can be a source of gravitational effects on other...
Apr18-14 01:19 PM
PAllen
18 791
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...
Apr18-14 09:42 AM
Andrew Mason
14 695
In Steven Weinberg "gravitation and cosmology principles and applications of the general theory of relativity"...
Apr18-14 09:27 AM
nenyan
0 201
Hi, this might be a silly question, but it does confuse me when I read about general relativity. From what I know...
Apr17-14 12:10 PM
jtbell
2 305
Im reading about Coulombs law in my textbook. It states that: "The forces between to charged particles are...
Apr17-14 10:47 AM
UltrafastPED
1 204
Here is my basic question: Lets say we have a massless charged shell with charge q and radius R. Is there some R...
Apr16-14 01:36 PM
PeterDonis
20 522
This has bothered me for a long time. I understand that time varies with velocity relative to the observer. But what...
Apr16-14 06:33 AM
Nugatory
9 366
Suppose a black hole travels at something like v = 0.999999999c relative to some observer. Does the black hole's event...
Apr16-14 04:46 AM
martinbn
6 368
In another thread Wannabenewton mentioned: and gave this reference: Until WBN mentioned it, I had never given...
Apr16-14 01:44 AM
WannabeNewton
199 7,797
Hello everyone. Thought of this question while at work. I've read the universe appeared out of nothing and expanded...
Apr16-14 12:08 AM
Mordred
9 320
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
6 307
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
2 248
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
5 349
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
0 286
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
4 235
One problem in understanding Special Relativity is that it is intuitively hard to agree with relative simultaneity. ...
Apr14-14 05:15 PM
andromeda
38 1,633
"... 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
10 449
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
17 648
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
17 503
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
5 314
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
2 312
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
2 324
... 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 1,032
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 5,427

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