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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 42,414
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 42,061
I'm not native English speaker so some words or phrases I say maysound strange and awkward but I hope you could get...
Dec11-11 03:23 PM
Vanadium 50
5 1,328
Has anybody come up with a way to derive the LT not based on the constantcy of the speed of light in all inertial...
Dec11-11 10:24 AM
harrylin
38 6,052
Hi, I'm studying the general relativity with the book by Woodhouse, and I have a question about the past set in...
Dec11-11 08:21 AM
rurouni_sohji
0 868
For instance at what speed would something have to be going relative to the Earth that only one day happens for this...
Dec11-11 03:07 AM
ghwellsjr
6 1,286
I understand the equivalence of gravity and uniform linear acceleration. But I'm less clear on the example involving...
Dec10-11 07:09 PM
A.T.
10 3,065
When I heard about the faster than light neutrinos, I began wondering about what changes that would make in physics. ...
Dec10-11 06:53 PM
phinds
7 1,729
I was wondering if anyone could explain to me where the 2nd order terms in the gauge transformation ...
Dec10-11 06:06 PM
torquil
1 944
I read this week in Schutz's description of Pound-Rebka experiment, which demonstrate that a photon also interacts...
Dec10-11 01:56 PM
Passionflower
2 1,422
hi all I was thinking abt the time dilation derivation thought experiment a flash of light shone on a mirror(imagine...
Dec10-11 11:51 AM
Janus
6 1,729
Suppose you have the simplest type of black hole - time independent, no angular momentum or charge, Schwarzschild...
Dec9-11 06:53 PM
Elroch
17 4,227
Hello, Surfing the web I came across a question posted by someone. Basically the question asked if I were to have a...
Dec9-11 05:23 PM
Passionflower
15 1,782
So the principle of equivalence states that any effects due to acceleration must also occur with gravity, as it's...
Dec9-11 07:39 AM
Fredrik
9 2,175
I have some questions about time dilation I not really understand to come further (and I find it all very...
Dec8-11 09:19 PM
digi99
8 2,683
The twin paradox seems not to be understand by everybody. But if you see it like this (see below), everybody...
Dec8-11 07:52 PM
digi99
17 2,191
At an origin there is an observer (A) who fires a laser at a series of beacons in a straight line spaced 186,000 miles...
Dec8-11 05:45 PM
DaleSpam
12 1,583
I'm in an intro course and my shaky ability to solve differential equations is apparent. How would you go about...
Dec8-11 05:34 PM
pervect
1 1,917
It says that x' = gamma (x-vt) Now what exactly does that formula mean? I take it that x is a point in my...
Dec8-11 02:43 PM
ghwellsjr
8 2,137
Dear All, My quest for an answer began a few days ago when I was at my mates house and we were watching a...
Dec8-11 12:49 PM
boogiewithstu
16 2,024
The stress-energy tensor is usually defined in standard GR treatments as T_{\mu\nu} =...
Dec8-11 11:50 AM
ramparts
5 2,200
Hi all, Let's say we can witness a star going inside a black hole. From our perspective the star will approach the...
Dec8-11 08:10 AM
Elroch
25 3,867
My professor asks, "Double check a formula that specifies how Riemann tensor is proportional to a curvature scalar."...
Dec8-11 04:38 AM
haushofer
2 1,088
Hi, I'm trying to reconcile some general relativity stuff and I'm getting confused on a few topics. Would someone be...
Dec8-11 12:58 AM
PAllen
13 2,623
Please correct me where I'm wrong, Our solar system is moving around our galaxy at 250km/s and CERN can accelerate a...
Dec7-11 09:07 PM
PAllen
6 6,953
I am having trouble understanding how special relativity reconciles the concept of causality. In one frame of...
Dec7-11 05:36 PM
Functor97
2 1,208
Hi I m new here. i hv been thinking,searching abt this but could get no where If i m moving in a rocket away from...
Dec7-11 10:34 AM
ghwellsjr
1 1,520
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 1,708
From http://www.physicsforums.com/showthread.php?t=40391 in gravitational time dilation. At the center of...
Dec7-11 04:30 AM
pervect
2 1,251
Leptons are supposed to be eternal because they do not decay. What about if you through a lepton (say electron in this...
Dec7-11 01:11 AM
tom.stoer
2 1,186
I have a few questions about time dilation due to gravity. It seems to me there are some strange/interesting...
Dec7-11 12:51 AM
PatrickPowers
30 9,524
Recently after taking differential equations, I started doing EM problems and have gained a "feel" for Maxwell's...
Dec6-11 02:25 PM
DuckAmuck
0 880
Obviously, infinite speeds would defeat time keeping. Infinite speed would imply that a particle could be at the...
Dec6-11 11:32 AM
lalbatros
6 1,288
1 how to find that the universe is expanding from general theory of relativity 2 how to apply general theory of...
Dec6-11 10:13 AM
Naty1
7 1,748
Suppose, there are two inertial frame first is in motion with constant speed and second is motionless. We can say that...
Dec6-11 10:04 AM
Naty1
4 1,380
Is there any relationship between the Lie (\pounds) and covariant derivative (\nabla)? Say I have 2 vector fields...
Dec6-11 09:01 AM
nickj1
9 9,938
So, I've never been able to understand where the extra mass comes from when an object is traveling near the speed of...
Dec5-11 08:48 PM
PAllen
19 3,083
Space time Geometry and GR, taken from lecture notes http://www.mth.kcl.ac.uk/courses/cm334.html ...
Dec5-11 12:51 PM
atyy
1 1,553
I have read: F=q(v*B) where q=charge of the particle v=velocity of the charge particle ...
Dec5-11 08:57 AM
jfy4
3 1,337
HI all There is smth I dont understand in building initial data for BH The equations everybody uses uses spacetime...
Dec5-11 08:53 AM
PeterDonis
11 1,946
In another thread here, http://www.physicsforums.com/showthr...=548148&page=3, post #36, Peter Donis posted...
Dec5-11 07:45 AM
Naty1
5 1,241
Ok. I understand that the set of Lorentz boosts and space rotations is equivalent to the set of Lorentz...
Dec5-11 02:02 AM
Fredrik
4 1,876

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