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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 42,473
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 42,128
Hi everyone: Do event horizons appear to be surrounded by all the stuff that has ever fallen in? As I understand...
Jan12-12 04:27 PM
tom.stoer
38 3,922
A quote from an old thread reads "Energy is the time component of the momentum 4-vector" That quote came from a...
Jan12-12 02:10 PM
elfmotat
6 1,155
Anybody could explain me the difference between tidal forces and gravitational waves? My question emerges from the...
Jan11-12 08:49 AM
timmdeeg
11 1,805
In his book 'Concepts of MODERN PHYSICS', Chapter 1, Section 1.7, page# 22to 24, Arthur Beiser tries to derive an...
Jan11-12 08:11 AM
PAllen
12 1,495
I'm getting myself confused here. If my relativistic Lagrangian for a particle in a central potentai is L =...
Jan11-12 07:58 AM
maverick_starstrider
3 1,178
*** Had a chance to rethink this and still believe it makes sense, so I need somebody to put me straight :-) *** ...
Jan11-12 02:54 AM
Mike Hobbs
26 4,011
Suppose two black holes graze one another in a high speed encounter. The collision is glancing such that the event...
Jan10-12 11:16 PM
Antiphon
2 1,131
Hi Guys, Im just new to SR & GR. I learned about Lorentz contraction and time dilation, but they dont make sense when...
Jan10-12 09:55 PM
ghwellsjr
45 5,653
Hello! I ask this question in this forum because I wish to be given a general explanation. Hope it is OK given...
Jan10-12 06:02 PM
Bill_K
1 824
I was just playing around with thoughts while laying in bed, and I need confirmation or rejection of a random idea...
Jan10-12 04:14 PM
D H
34 5,517
Consider the variational principle used to obtain that in the vacuum the Einstein tensor vanish. So we set the...
Jan10-12 03:57 PM
Bill_K
1 791
Hi all, this is not a HW problem but one I made up myself, (so you won't find it in any txtbooks or solutions etc.)....
Jan10-12 03:41 PM
ghwellsjr
4 1,025
Has anyone worked all the way through D'Inverno Chapter 19 Problem 19.5? I've had a good thrash at it - it is quite...
Jan10-12 05:48 AM
TerryW
2 1,210
Hi, Just a quick question I can't get my head around.... Say I have a big planet sitting in intergalactic space and I...
Jan10-12 03:15 AM
harrylin
23 2,982
If two objects move away from each other both at the speed of light, after 1 second will they be approximately 372,000...
Jan10-12 12:32 AM
my_wan
6 1,110
Hi, I've begun learning about General Relativity, though I've already had some exposure to differential geometry. ...
Jan9-12 09:44 PM
PhizzyQs
4 1,671
Einstein is riding the beam of light away from the clock tower so the hands of the clock don't move. Suppose the...
Jan9-12 05:41 AM
harrylin
5 1,481
Hello i studied Sadri Hassani az mathematical physics book. if i want to learn topology (( for general relativity ))...
Jan8-12 03:19 PM
George Jones
4 1,622
I've been trying to find out what the definition of negative pressure in the context of General Relativity. There are...
Jan8-12 10:44 AM
timmdeeg
20 2,740
Hello, I thought of asking would someone know what is the correct thinking here... A body is thrown upwards, its...
Jan8-12 08:42 AM
Q-reeus
46 5,177
The stress-energy tensor is associated to a volume density and flux in 4-spacetime and the Einstein tensor seems to...
Jan7-12 02:39 PM
TrickyDicky
8 1,268
Hi, I'm kind of a noob when it comes to physics so I just have to ask. Me and my friends are kind of in a pickle, so...
Jan6-12 03:14 PM
pervect
13 1,888
I like astrophysics,so i read books relating to it.I am also determined to make my career in the same.At present i am...
Jan6-12 09:06 AM
ghwellsjr
1 1,182
I had this doubt studing GR, but lets consider SR for semplicity, where g_{\mu\nu}=\eta_{\mu\nu}the geodesics are...
Jan6-12 07:45 AM
Mentz114
5 1,289
There is a thought experiment pertaining to general relativity that involves a signal traveling from the front to the...
Jan6-12 05:56 AM
ericqb
3 1,294
Gravitational waves are generated when the mass quadrupole moment changes in time. We also know motion of mass...
Jan6-12 04:02 AM
timmdeeg
12 1,905
E=MC^2 Here, say we want to find the energy of a single photon. that means, mass of photon x speed of light...
Jan6-12 12:33 AM
jedishrfu
9 1,644
By SR, relativistic energy and mass are proportional to the Lorentz factor γ, therefore, grow to infinity for...
Jan5-12 10:57 PM
climatos
10 1,632
I've posted on this forum before and carefully read the answers, but I'm still confused... Also, I'm familiar with the...
Jan5-12 09:54 PM
ghwellsjr
13 1,942
Thank you in advance for reading this and hopefully answering my questions. I've spent about two hours or so now...
Jan5-12 06:47 PM
pervect
4 1,636
It's fairly easily to visualize space bending as a result of the mass of an object, and that the bending of space is...
Jan5-12 07:52 AM
tgm1024
19 2,497
How would you go about teaching relativity to someone who refuses to take anything on faith or argument from...
Jan5-12 07:38 AM
DaleSpam
37 3,528
I just got my first official introduction to relativity in my textbook (I'm equivalent to a high school senior...
Jan5-12 04:43 AM
PrincePhoenix
35 3,398
Does anybody kow about a good summary (online) of the singularity theorems?
Jan5-12 01:20 AM
tom.stoer
2 1,180
Let's say we have two clocks that are synchronous here on Earth. One of the clocks is instantly transported to...
Jan5-12 01:06 AM
ghwellsjr
26 4,018
Hello what is the meaning of covaraint derivative ? where the ordinary derivative of a function whit respect to a...
Jan4-12 04:40 PM
Naty1
3 854
Hello everyone Can some one please provide (a link to) the most rigorous proof of E_0 = mc^2? Actually, I got stuck...
Jan4-12 02:50 PM
quZz
2 887
Increase in weight if an object is illuminated Are there experiments which show that the weight of a body, with...
Jan3-12 10:40 PM
climatos
3 1,083
Hey, I'm just curious, MOND (Modified Newtonian Dynamics) seems to have a character of field renormalization...
Jan3-12 03:32 PM
rorix_bw
6 1,058
Is it possible for a particle to exist according to one reference frame and simultaneously not exist according to...
Jan3-12 03:01 PM
pervect
7 1,563

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