
The section of the Usenet Physics FAQ titled "Experimental Basis of Special Relativity" has been cited here many...

Dec3107 02:06 AM
jtbell

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41,320 
Before posting anything, please review the Physics Forums Global Guidelines.
If you are seeking help with a...

Feb2313 08:40 AM
ZapperZ

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41,678 
I am doing a research about the compact Milne Universe in two dimensions Using special relativity.
such that (t,θ)...

 
 
 
This may be a stupid question, but have the various gravitational wave observatories around the world been tested by...

T 03:42 PM
PeterDonis

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70 
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...

Feb513 09:38 PM
Drakkith

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For another BRS thread, I looked up some information at http://www.genealogy.ams.org/ and was completely sidetracked...

Mar110 05:00 PM
Chris Hillman

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125 
Does the following argument prove that any method of faster than light communication is impossible?
1. A...

T 05:43 PM
Fredrik

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129 
I've read that the Alcubierre Drive depends on the existence of negative mass, but I've seen that physicists say it...

Jul2914 02:06 AM
Simon Bridge

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141 
Although I can't nominate myself for a Nobel Prize, I was wondering I any distinguished scientist would oppose such a...

Feb1213 02:55 AM
kloptok

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146 
I’ve been thinking about Einstein’s gedankenexperiment (because I’m meta like that) regarding the sealed room on...

T 11:52 AM
Nugatory

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I'll try rephrasing my question, as I do not wish to question the theory itself. Verily, verily, it would be...

Feb1613 04:19 PM
Didymus

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164 
It is known that, by the expansion of the universe, galaxies that are roughly 4200 megaparsecs away travel away from...

T 06:19 PM
phinds

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167 
I understood that the basic idea of the MichelsonMorley experiment was to measure the velocity of light, as seen from...

Jul2914 09:01 AM
ghwellsjr

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197 
Ok so I read this on another site... "the Milky Way is part of the Local Group...The Local Group is calculated to move...

T 01:12 PM
ghwellsjr

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212 
Hi, I'm trying to understand why the metric I've seen for AdS space,...

Jan2414 11:38 AM
copernicus1

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220 
On the spacetime manifold in general relativity, one chooses a basis at a point and express it by the partial...

May1714 02:59 PM
Matterwave

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223 
Hello,
Some knows how to Bondi deduce his radiating line element? I read some papers and there isn't any hint about...

May414 07:21 PM
btphysics

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225 
I am somewhat distracted so this post will not be what it should, given that GAP is one of my interests.
For those...

Mar1110 05:17 PM
Chris Hillman

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226 
This is about Hans Ohanian, "Einstein's E = mc2 mistakes," http://arxiv.org/abs/0805.1400 , a historical paper that...

Jan2314 06:03 PM
bcrowell

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The basic question was inspired by some other recent threads on the "fabric of space". If we imagine a 2d spatial...

Jul2914 05:44 AM
haael

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236 
would time dilation occur if for example, i was making a hydrogen atom spin with the center of spin the atom? would...

May1914 03:40 PM
mfb

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239 
I'm reading an old article published by Kaluza "On the Unity Problem of Physics" where i encounter an expression for...

May1514 07:58 AM
Bill_K

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242 
In Bianchi IX, the isometry group is the group that admits the same lie algebra as the lie algebra of SO(3). What...

May1614 04:34 AM
befj0001

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243 
Hawking said that the horizon area of a black hole never decreases and illustrated that in his Hawking Are Theorem:
...

May1714 12:22 PM
PeterDonis

5 
246 
In my book it says that the Lorentz group O(3,1) includes 'discrete reversals of the time direction'.
What on earth...

May1814 10:21 PM
Aziza

3 
247 
In classical mechanics we talk about homogeneous and inhomogeneous gravitational fields.
Do we do this with...

Feb514 09:35 AM
DaleSpam

1 
248 
In classical mechanics we can get a nice overview of the dynamics of a system by looking at its positionmomentum...

May414 03:12 PM
WannabeNewton

1 
249 
I read recently that "...at present only GR theory predicts the required 13 parameters for agreement with critical...

Jun1214 09:57 AM
WannabeNewton

1 
249 
Hello,
I am working on a project but I stuck at a point. I found that divergence of two objects are equal...

Mar1214 05:17 AM
crimsonidol

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251 
Hi,
I think I have several misconceptions about the theoretical framework of black holes, I'm just not sure where my...

Mar914 08:04 PM
sciencegem

2 
252 
I started attending to GR lectures, and there we referred to an intelingent beetle living on a 2D flat space and...

Apr1014 10:54 AM
ChrisVer

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253 
Due to the diffeomorphism invariance of GR ##(M, g_{ab})## and ##(M, \phi_*g_ab)## represents the same physical...

Jan2814 08:37 AM
center o bass

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254 
when we use a change of reference

Oct1813 02:16 PM
DaleSpam

1 
257 
A couple of questions about this paper, which, unfortunately, I can't access in is entirety...

May2114 12:46 PM
Bill_K

2 
258 
Hey, I read that if a fourvector is 'fourorthogonal' to a timelike four vector then it must be spacelike. I showed...

Mar1114 09:35 AM
Bill_K

1 
261 
I'm getting pretty lost with how initial data works in general relativity.
Assuming the energy momentum tensor is...

Mar714 07:34 PM
WannabeNewton

1 
263 
Hi,
I am working through Section 5.8 of Sean Carroll's book on GR. Does someone know where I can find the bridging...

May1114 10:48 PM
PeterDonis

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263 
Here is a new video, addressing a common question on this forum:
jlTVIMOix3I
It's similar to that one, but has...

Jul2714 04:45 AM
A.T.

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265 
Disclaimer: I have no formal education in physics.
I watched a TedTalk...

Jan2214 02:58 PM
mfb

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268 
if we know the relations between time and distance at the moving frame and stationary frame why can't we derive the...

May314 12:09 PM
DaleSpam

4 
273 
Hey guys,
I am working on a computer simulation of our solar system and basically analyzing the affects of the...

Mar114 04:18 PM
muzz

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274 
Hello! I am interested in knowing the existing relation between the ADM Formalism and the WheelerdeWitt Equation.
...

Feb1114 10:16 AM
jesusrods

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275 