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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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Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Feb23-13 08:40 AM
ZapperZ
1 37,500
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 37,234
Random question that I thought of while trying to fall asleep last night. :) We all know that galaxies moving very...
Jul11-08 07:55 PM
Antenna Guy
10 1,928
According to my physics textbook, the equation E^2=\left(mc^2\right)^2+\left(pc\right)^2 suggests that a particle may...
Jul4-11 12:09 PM
Parlyne
15 1,928
In the current mainstream theory of black holes, there exists a singularity of infinite density. However, it seems to...
Jun20-11 08:22 PM
bcrowell
2 1,928
How can the derivative of a basis vector at a point be the linear combination of tangent vectors at that point? For...
Jul27-11 04:30 PM
RedX
13 1,928
hi how is space curvature around a mass. i mean what's its direction in real 3D space?
Dec9-04 11:02 PM
Majid
9 1,927
Consider a source of light S stationary in I and an observer R moviong with speed u . At the origin of time R is...
Nov15-06 08:57 PM
bernhard.rothenstein
7 1,927
I've read about Schwarzschild and Kerr metric, I confused about the spacelike singularity(occur in non-rotating...
May28-10 05:55 AM
stevebd1
2 1,927
Is this a possibility?
Sep3-11 05:03 PM
pervect
4 1,927
From a far away observer, thing falling into a BH takes infinite time to cross the horizon. At the same time, the...
Apr25-11 12:07 PM
Naty1
7 1,926
:- It that Real??? http://www.superstringtheory.com/forum/socboard/messages6/99.html
Dec3-03 03:29 PM
LURCH
11 1,925
If Eisenstein taught us the space time is one and the same thing, then how did he mathematicaly prove that. How did...
Jul25-12 07:33 AM
PAllen
13 1,925
Consider the following "classical" example: ^{}_{} A system Σ' moves away from a system Σ with relative velocity v...
Jul15-12 07:35 PM
Muphrid
29 1,925
Please help with this. This is similar to the Einstein train experiment. When C and C' are at the same place,...
Nov20-13 07:58 PM
DaleSpam
48 1,925
Hi all I was recently told that certain postulates of SR are equivalent or one can be derived from the other. Namely...
Oct6-07 05:48 AM
pmb_phy
7 1,924
I was reading this: http://www.esa.int/SPECIALS/GSP/SEM0L6OVGJE_0.html and apparently it seems that Martin...
Jan9-08 10:47 PM
jostpuur
6 1,924
In general, what can one say about the relationship between geodesic motion of (massive and massless) particles and...
Mar17-10 08:04 PM
atyy
1 1,924
I did some searches, but couldn't find an answer to this on this forum. Since a photon can travel 1 km, 1...
Jun5-13 07:09 PM
Vanadium 50
11 1,924
Hi, I've just got the following question for you guys... Say that Bob is travelling away from the Earth at...
Apr7-06 06:09 PM
Janus
31 1,923
In "Frozen Light" an article written by Lene Vestegaard Hau, it talks about Lene's experiments with, literally,...
Oct24-06 10:44 AM
DaveC426913
10 1,923
It has been said one of the great mysteries of the universe is how light can be both a wave and a particle. Indeed...
Jan16-08 11:22 AM
Magic Man
9 1,923
hey..while looking into the consequences of the invariance of light....we see that time needs to be slowed down in...
Jan24-08 02:51 AM
Fredrik
10 1,923
Since everything in the universe is moving relative to the other, how can one measure an absolute velocity? Therefore,...
Feb7-08 08:07 PM
pervect
14 1,923
The earth moon distance = 3.8 * 10^8 meters Time for light to reach moon = 1.266 sec. A laser at the origin on earth...
Oct29-08 10:18 AM
LURCH
2 1,923
Hi,all, problem: 2 stars, distance is 1 lightyear. If I move one star, will the other star move 1 year later? ...
Mar3-10 05:08 AM
luxiaolei
2 1,923
Could the process of Electron-positron pair production work with anything else in our universe? I.E. Could our...
Dec3-10 09:00 PM
stever19
0 1,923
I'm reading how the Lorentz equations allow for relativistic transformation that can include Maxwell's equations but...
Sep6-06 08:25 AM
RandallB
19 1,922
Is it possible that gravity and the strong force could be the same just on a smaller scale giving it different...
Nov9-08 10:00 AM
Jonathan Scott
3 1,922
I've been trying to put this together in my head for a while and it doesn't come out. For example, if there are more...
Dec16-08 03:35 PM
Pippo
11 1,922
Because time slows down at the speed of light does then light itself potentially travel at almost infinity per zero...
Nov16-12 09:44 AM
nitsuj
25 1,922
Pendulums tick faster when they weigh more. ie a falling pendulum in any gravity won't tick as it is effectively...
Jul13-10 11:10 PM
gonegahgah
4 1,921
Let's say an observer A in his rest system has a wave function for an electron double slit experiment (psi function of...
Jul13-11 12:32 AM
Mentz114
3 1,921
Hi, I'm reading this wikipedia article on the metric connection, and it says that the Levi-Civita connection is a...
Oct24-11 02:52 PM
UndeadCat
11 1,920
What sort of software do people here like to use to mangle, errr I mean manipulate, Tensors in General Relativity?
Aug23-04 05:31 PM
pervect
2 1,919
In special relativity, the mass of an object increases as the speed approaches c. Geometrically, this can be...
Jun30-10 05:53 PM
hawkingfan
6 1,919
Hi everyone, I recently read an essay by Isaac Asimov called "Figure of the Farthest", which discussed the ideas on...
Sep22-10 09:39 AM
jambaugh
19 1,919
Alright, I'm a bit ignorant when it comes to more advanced subjects (well, very ignorant...), but, from my...
Nov28-10 09:10 AM
bcrowell
6 1,919
Hi guys, here's my question: An accelerated observer (both in curved or non-curved space) who Fermi Walker...
Jul16-11 02:22 PM
atyy
17 1,919
can a black hole accelerate an object to c(because its escape v is greater than c)
Dec31-07 10:31 AM
cosmic.ash
5 1,918
In high school, doing modern physics, and was struck by a thought about light, energy of a photon and the "speed...
Oct16-11 06:59 PM
yoron
9 1,918
I don't know if this is the right place to post this but would a proton falling into a black hole experience tidal...
Jun28-11 07:34 PM
bcrowell
10 1,918

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