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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 41,654
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 41,299
What are the equations that shows that time slows down as you near a black hole? I'm trying to prove to a...
Jul5-14 04:50 PM
PeterDonis
7 1,452
Dear All, I am teaching myself tensors for the first time. I am using D'Inverno's book and got stuck at page 73....
Jul5-14 04:19 PM
Matterwave
5 1,333
The symbol, c, represents both the speed of light and the speed of sound in most scientific reference texts. Can the...
Jul5-14 11:46 AM
DaleSpam
54 9,530
By theoretical calculations of super dense black holes show their gravity exceeding to a limit that can pull in light...
Jul5-14 10:14 AM
stevebd1
11 2,060
Hey all, I've been reading "Time Travel and Warp Drives" by Allen Everett and Thomas Roman, and the book had an...
Jul5-14 09:03 AM
DaleSpam
3 1,096
I am curious to know the various opinions, what ideas you favor as to the cause of inertia? What could the reference...
Jul4-14 04:58 PM
yogi
25 4,986
I've heard that a changing magnetic field creates an electric field and vice versa. So if shoot an electron in a...
Jul4-14 04:16 PM
Nugatory
3 986
Hello guys, I just had to ask a quick question about the nature of light. In different synchronization parameters...
Jul4-14 03:33 PM
DaleSpam
9 1,784
Hey guys, as this is a basic QFT question, I wasn't sure to put it in the relativity or quantum section. Since this...
Jul3-14 09:31 PM
jk86
1 1,099
If someone stands up through the sunroof of a car travelling down the freeway at 60 mph and measures the speed of a...
Jul2-14 05:58 PM
nikkkom
10 1,509
Hi all, What is the difference between Lorentz transformations and yt?. That is, the Lorentz transformations for...
Jul2-14 04:12 PM
pervect
6 1,185
SR is a theory based on flat space-time, and all of its effects are there in a flat space-time framework.My question...
Jul2-14 03:28 PM
WannabeNewton
30 3,965
After my studies of metric tensors and Cristoffel symbols, I decided to move on to the Riemann tensor and the Ricci...
Jul2-14 01:45 PM
ChrisVer
15 1,560
Hello guys! I've been trying to get some intuition for differential forms. I know the formal theory and I know how...
Jul2-14 09:26 AM
micromass
2 981
This bothers me, and the question is simple: If am working with a non-minkowski metric g, when raising or lowering...
Jul2-14 09:22 AM
WannabeNewton
3 1,090
Hi all, Is it possible to derive the equation p = ymv, and hence based on this, kinetic energy formula, without...
Jul2-14 09:01 AM
pervect
5 1,115
I have read some basics knowledge about General Relativity and I see that it deal perfectly with gravity. But what...
Jul1-14 08:27 AM
WannabeNewton
6 1,209
A second SR question that has been on my mind lately is that of hyperbolic nature of Minkowski space. The fact that...
Jul1-14 06:24 AM
pervect
4 1,031
Hey guys, in classical mechanics Newton's law of universal gravitationa force says that the force between two...
Jul1-14 02:22 AM
haushofer
10 1,422
I just derived the 3-D Cristoffel symbol of the 2nd kind for spherical coordinates. I don't think I made any careless...
Jun30-14 11:10 PM
PeterDonis
6 926
According to my understanding of SR, a light photon traveling at c, of course, relative to me "experiences" no time. ...
Jun30-14 09:23 PM
PeterDonis
7 1,043
Sorry if I mess up some terms, im not a physics guru in any way. To my understanding, the universe inflates like a...
Jun30-14 07:15 PM
PAllen
9 1,386
I was just thinking about this, and from a perspective of an inertial frame, it's easy to see how distances contract,...
Jun29-14 08:39 PM
DaleSpam
5 1,440
I recently derived a matrix which I believe to be the metric tensor in spherical polar coordinates in 3-D. Here were...
Jun28-14 11:39 AM
space-time
2 849
Static spacetimes can be defined as having no g_{tx} component of the metric. Alternatively we can say that they...
Jun28-14 09:44 AM
WannabeNewton
5 738
Bear with me, I am (not even) a chemist. This is something that bothers me for some time. The larger the black...
Jun28-14 12:33 AM
PAllen
22 2,992
Suppose there were a supermassive, superdense hollow sphere. Inside of the sphere, would time move more slowly...
Jun27-14 10:45 PM
PeterDonis
7 990
There are several threads on the Bell paradox, plus the article in the FAQ forum, but I must be missing something...
Jun27-14 07:58 PM
PeterDonis
25 2,628
When we talk about space-time curvature or the curvature of space, how many different "types" of curvature are there...
Jun27-14 04:06 AM
Drakkith
10 798
Objects with mass always travel less than c with respect to other objects with mass. Objects without mass always...
Jun27-14 01:15 AM
PAllen
17 1,387
Hello. I was going through the problems in the angular momentum chapter of the text "Problem Book in Relativity and...
Jun26-14 09:39 PM
WannabeNewton
22 1,876
Hi! New here. Be gentle. Kinda an idea that popped into my head a little while ago: Are the tidal forces of...
Jun26-14 08:36 PM
PeterDonis
58 4,659
I am trying to get an understanding of general relativity one tidbit at a time. I have a vague concept of why curved...
Jun26-14 04:19 PM
pervect
7 732
I think I have come across something that invalidates something one of my Physics professors said back in college,...
Jun25-14 09:23 PM
DaleSpam
27 2,009
I am planning to start self studying GR and, before choosing a better book to use, I have been flipping through an old...
Jun25-14 11:31 AM
WannabeNewton
5 679
We have the (I think FRW) metric in the coordinates y^{0}=t,~~y^{1}=\psi,~~y^{2}=\theta,~~y^{3}=\varphi ...
Jun24-14 04:32 AM
ChrisVer
5 862
I only understand mass and energy according to Newtonian mechanics, Where mass is the resistance of a body to...
Jun23-14 02:06 PM
pervect
3 674
It is well-known that Newtonian's law of gravitation \Phi(\vec{r}) = -\frac{Gm}{|\vec{r} - \vec{a}|} for the...
Jun23-14 07:45 AM
stevendaryl
20 1,864
A lorentz transformed electric field has it's own name. It's called a magnetic field. That makes me wonder if there...
Jun22-14 10:52 PM
pervect
4 591
Hello, I have a doubt regarding the postulates of SR. The two postulates, according to Schutz, are: 1) No...
Jun21-14 08:33 PM
Meir Achuz
122 7,893

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