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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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Common Relativity questions, quality answers
Jul24-14 09:06 AM Greg Bernhardt 
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Jan16-12 Greg Bernhardt
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Feb23-13 08:40 AM
ZapperZ
1 42,293
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 41,924
Hello, well I just read a paper by Atish Dabholkar and Ashoke Sen, titled "Quantum Black Holes", pp. 4-5 as shown...
Oct14-11 09:17 AM
aCHCa
2 1,707
EDIT: I am looking for a correction in my understanding of relativity. A model of the universe as it appears to a...
Aug15-11 02:03 PM
D H
10 1,706
Here's the paper I'm talking about http://arxiv.org/PS_cache/gr-qc/pdf/9702/9702005v1.pdf It's times like this I...
Jan14-08 09:28 PM
CJames
2 1,705
Einstein is commonly regarded as the primary inventor of special relativity. I'd like to trust the collective wisdom...
May11-10 08:31 PM
atyy
2 1,705
This time I am asking for help on a problem. I think I have an answer for problem 23, part (a), but I would like...
Oct22-05 09:48 PM
pmb_phy
6 1,704
We say that the uniformly accelerated motion x=gtt/2 is not a relativistic motion because after a sufficiently long...
Aug7-06 03:02 PM
pervect
2 1,704
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
shoehorn
1 1,704
An astronuat in a nuclear ship accelerates away from earth and gets very near the speed of light, .99999% in fact. ...
Apr7-08 11:27 AM
LURCH
9 1,704
A recent paper has the title "There is no really good definition of mass", phys.teach. 44 40 2006. Do you think that...
Feb18-06 03:08 PM
Careful
12 1,703
Hi, I've heard it said that for Schwarzschild spacetimes, then the coordinate 'r' is an affine parameter for radial...
Feb6-11 04:07 AM
LAHLH
8 1,703
Hi there, Physics lovers!! I've got some questions for you!! Denoting by (1)...
Apr21-11 01:37 AM
MManuel Abad
2 1,703
ok, if when we look at a planet that is say 100000 light years away, and we can see it emitting light, and that light...
Nov27-11 04:28 PM
ianpr
14 1,703
The subject of time dilations has always fascinated me. Sometimes the thought experiments can get confusing but there...
Nov10-11 08:11 PM
nhmllr
4 1,703
Hello there Ladies and Gents! This question is (mostly) related to problem 10.2 in Wald which is to show that the...
Apr26-13 08:51 AM
WannabeNewton
20 1,703
The example given is as follows : we have 3 space ships(numbered from left to right) placed in space moving at...
Jul15-14 01:37 AM
ghwellsjr
7 1,703
Does the relative motion of a thing slow down the relative motion of a thing? Hope that makes sense or you can work...
Jan18-12 08:53 PM
jartsa
10 1,702
The laws determinning the passage of light through varying densities of transparent material and through varying...
Aug24-05 05:13 PM
Phobos
6 1,701
two identical ships launch on parallel paths r distance apart. the are completely alone ]. once they reach some...
Apr4-11 11:46 PM
ghwellsjr
9 1,701
Hello All I'm new to the forum and have a question. I was looking at the time dilation function and noticed that...
Aug11-11 05:14 PM
Ossama
9 1,701
Hello, I've been doing some relativity self-study and have what may be a silly question but one that has me...
Nov20-12 01:40 AM
akvikram_rk
16 1,701
Hi folks I've picked up a rather old book. It was written back in 1965 by Fritz Rohrlich and is called "Classical...
Oct26-05 11:15 AM
pmb_phy
1 1,700
After mulling over special relativity for a while, I have come to some conclusions that seem correct, but I don't know...
Nov11-07 05:05 AM
FunkyDwarf
5 1,700
I assume that Misener et all are assuming some prior knowledge here, which I may have, but I do not get their...
May16-08 08:36 AM
Hacky
0 1,700
Forgive me if I'm being naive or if this has been answered before, but, I was wondering if someone can explain to me...
May2-09 04:02 AM
JesseM
8 1,700
I have been doing searches on the relativity of time and its relation to the "age of the universe," among other...
Dec7-11 08:03 AM
Elroch
5 1,700
I had 1 year ago a little discussion with DaleSpam about the short Lorentz derivation (triangle) if a photon alone...
Apr16-13 06:38 PM
digi99
16 1,700
Hello, I just finished reading special theory of relativity written by Albert Einstein himself. Even though I...
Aug5-04 08:07 PM
HungryChemist
7 1,699
I've read that in GR, gravity isn't considered to be a force, or that it's considered to be a fictitious force because...
Sep13-07 02:08 AM
rcgldr
5 1,699
When you are in a box it is difficult to know the difference between if the box is accelerating in space or you are...
Feb22-10 09:10 PM
gonegahgah
18 1,699
So, I don't get it... I know Einstein said that space-time was a "fabric" but I can't visualize that, with us being in...
Aug5-10 03:48 PM
stevmg
14 1,699
The Grandfather Paradox Something thats been on my mind for sometime.... If you were to travel back in time and...
Oct14-10 08:25 PM
PAllen
8 1,699
I'm trying to use the equations on this page and I have solved the following. Is it correct? ...
Aug4-11 03:54 AM
randombill
1 1,699
Please feel free to move this to the correct forum. After doing some reading, I've found that Electromagnetic...
Sep30-12 08:59 AM
Bill_K
6 1,699
Can the theory of general relativity be deduced without appealing to the ideas of special relativity? Quantum...
Jul10-04 07:07 AM
einstein_vishnu
2 1,698
Hi folks, I have a question about a paper by Thomas Mohaupt, called "Black hole entropy, special geometry and...
Apr2-07 10:11 AM
haushofer
1 1,698
if the time and distance between 2 events for observer A are t and d then what is the time and distance between those...
Sep21-08 12:43 AM
granpa
8 1,698
Consider A and B are moving in a linear motion, A claims B to move, and B claims that A is in motion, now when they...
Nov3-10 06:04 PM
AdamMc
11 1,698
Hi everyone, General relativity gives us the definition of the distance between two "events" d=\int...
Jun17-11 05:51 PM
jfy4
11 1,698
Why photons can't go any slower than the speed of light, in vacuum? Or if they could, then why they don't?
Aug9-14 03:41 PM
DaleSpam
74 1,698
if light hits a mirror at a 90 degree angle, wouldn't it HAVE to travel slower than the speed of light when it hit the...
Nov21-11 11:03 PM
turbo
5 1,696

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