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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 37,407
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 37,164
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 1,922
Let's say I start out a few thousand kilometers from a black hole, and I begin to move toward the black hole due to...
Aug3-12 02:13 PM
guss
34 1,922
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 1,921
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 1,921
We describe mass as creating "curvature" in the universe. Taking a simplified lower dimensional analogy, the universe...
Mar29-08 05:45 AM
Jonathan Scott
4 1,921
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 1,921
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 1,921
If one admit that the particle has the "real objective(observer independent ?)" trajectory x(t), then if it is...
Nov19-05 01:28 AM
kleinwolf
16 1,920
Problem 17.3 in the "problem book in relativity and gravitation" states: "Show that once a rocket ship crosses the...
Sep23-11 12:13 AM
keithdow
20 1,920
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 1,920
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 1,920
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 1,920
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 1,920
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
Imagine there is a train moving at .9c with a person on the train and an observer on a platform watching the train go...
Oct8-12 04:14 AM
A.T.
20 1,919
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 1,919
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 1,919
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 1,919
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 1,919
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 1,918
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 1,918
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 1,917
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 1,917
Hello, we know that according to special relativity nothing in the universe go faster than speed of light,but space...
Oct6-13 01:39 PM
DaleSpam
48 1,917
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 1,916
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 1,916
As I understand it, Einstein's dismissal of the "luminiferous aether" was based on his discovery that there is no...
Feb25-13 10:23 PM
DaleSpam
21 1,916
I have a quick question: Does the arrangement of spacetime directly dictate rates like velocity? For example, if...
Jun28-07 04:37 PM
robphy
7 1,915
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 1,915
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 1,914
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 1,914
Thermodynamics textbooks indicates that the total energy of a system E is given by the following equation ...
Nov16-04 11:05 PM
Iraides Belandria
16 1,913
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 1,913
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 1,913
This is a continuation of the thread Derivation of proper time of acceleration in SR
Sep25-10 05:58 PM
stevmg
14 1,913
Is there a general way of proving that the scalar product xuxu = (x0)2 - (x1)2 - (x2)2 - (x3)2 is invariant under a...
Aug30-08 12:04 AM
Fredrik
2 1,912
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 1,912
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 1,911
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 1,910
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 1,910

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