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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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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
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
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I am doing a research about the compact Milne Universe in two dimensions Using special relativity. such that (t,θ)...
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I know that you're going to probably say that a frame of reference doesn't make sense for light, but I've uploaded a...
Feb5-13 09:38 PM
Drakkith
4 78
For another BRS thread, I looked up some information at http://www.genealogy.ams.org/ and was completely sidetracked...
Mar1-10 05:00 PM
Chris Hillman
2 101
Although I can't nominate myself for a Nobel Prize, I was wondering I any distinguished scientist would oppose such a...
Feb12-13 02:55 AM
kloptok
4 128
I'll try rephrasing my question, as I do not wish to question the theory itself. Verily, verily, it would be...
Feb16-13 04:19 PM
Didymus
4 139
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
This is the second question in the BRS feedback poll. It has four possible answers; please check the box which best...
Aug15-10 11:56 AM
Chris Hillman
0 165
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
I am somewhat distracted so this post will not be what it should, given that GAP is one of my interests. For those...
Mar11-10 05:17 PM
Chris Hillman
1 179
Hi, I'm trying to understand why the metric I've seen for AdS space,...
Jan24-14 11:38 AM
copernicus1
0 185
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
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
Hi, I think I have several misconceptions about the theoretical framework of black holes, I'm just not sure where my...
Mar9-14 08:04 PM
sciencegem
2 199
This is about Hans Ohanian, "Einstein's E = mc2 mistakes," http://arxiv.org/abs/0805.1400 , a historical paper that...
Jan23-14 06:03 PM
bcrowell
0 200
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
In Steven Weinberg "gravitation and cosmology principles and applications of the general theory of relativity"...
Apr18-14 09:27 AM
nenyan
0 201
when we use a change of reference
Oct18-13 02:16 PM
DaleSpam
1 203
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
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
0 215
Disclaimer: I have no formal education in physics. I watched a TedTalk...
Jan22-14 02:58 PM
mfb
1 224
Hey guys, I am working on a computer simulation of our solar system and basically analyzing the affects of the...
Mar1-14 04:18 PM
muzz
0 228
Hello, I am working on a project but I stuck at a point. I found that divergence of two objects are equal...
Mar12-14 05:17 AM
crimsonidol
0 228
Due to the diffeomorphism invariance of GR ##(M, g_{ab})## and ##(M, \phi_*g_ab)## represents the same physical...
Jan28-14 08:37 AM
center o bass
0 229
Hello! I am interested in knowing the existing relation between the ADM Formalism and the Wheeler-deWitt Equation. ...
Feb11-14 10:16 AM
jesusrods
0 229
Sorry if this turns out to be a colossally stupid question. I'm a newbie. But since light has a constant speed in...
Apr7-14 05:42 PM
Nugatory
2 229
In classical mechanics we talk about homogeneous and inhomogeneous gravitational fields. Do we do this with...
Feb5-14 09:35 AM
DaleSpam
1 230
Kevin Brown, in his excellent book "Reflections on Relativity" p. 409, "immediately" integrates 2 geodesic equations:...
Apr9-14 07:35 AM
Bill_K
1 230
Hey, I read that if a four-vector is 'four-orthogonal' to a time-like four vector then it must be space-like. I showed...
Mar11-14 09:35 AM
Bill_K
1 231
I'm getting pretty lost with how initial data works in general relativity. Assuming the energy momentum tensor is...
Mar7-14 07:34 PM
WannabeNewton
1 233
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
https://www.youtube.com/watch?v=c3fJRRCAIdk This is a video of the 'barking dog' chemistry experiment captured with a...
Mar24-14 06:57 PM
russ_watters
1 236
For those who use GRTensorII, here is a simple and effective method for determining the Lie algebra of Killing...
Mar2-10 12:10 PM
Chris Hillman
2 238
Tensors can be of type (n, m), denoting n covariant and m contravariant indicies. Rank is a concept that comes from...
Jan24-14 09:50 PM
jcsd
4 238
I'm blanking on this at the moment, but a quick application of Noether's theorem would imply that, aside from the...
Mar9-14 05:21 AM
Ben Niehoff
1 240
Hello PF: I noticed a thread on PF in which TOM STOER and others were discussing how to calculate the redshift...
Aug13-13 06:26 AM
Mentz114
12 241
Is there any standard way for measuring the metric tensor. Does it require the a priori specification of a coordinate...
May27-11 03:31 PM
PAllen
2 244
If gravitational waves cause fluctuations in space time, than could all gravitational waves, large or small all would...
Jan16-14 03:32 PM
ilikescience94
0 244
I was looking at the Wikipedia entries on Time Travel and the Grandfather paradox and noticed a paragraph on the...
Mar6-14 04:58 AM
johne1618
1 244
Hiya, I am a grad student who has had a couple semesters of GR. I am currently perusing a book about Two Spinors in...
Feb10-14 02:34 PM
dozappp
0 246

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