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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 42,457
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 42,107
Does light have inertia? Suppose a light pulse is emitted in a moving train in the direction of trainís movement....
May22-14 10:40 AM
xox
9 1,152
You have two trains sitting on the equator (one on each side of the equator so they don't collide -.-). Train one is...
May21-14 10:32 PM
PeterDonis
3 561
1. How do we know that objects mass increase as they approach the speed of light 2. How did whoever figured this...
May21-14 01:58 PM
ZapperZ
23 871
A couple of questions about this paper, which, unfortunately, I can't access in is entirety...
May21-14 12:46 PM
Bill_K
2 268
Hi, I've just started Gravitation and Inertia by Wheeler and Ciufolini. This is really a sort of trasure to me,...
May21-14 11:42 AM
WannabeNewton
31 1,064
I have been reading GR but I have these gaps in understanding. Can someone help clear them? 1) SR has a...
May20-14 09:55 PM
Matterwave
5 589
Paul Lutus writes : Is this true? I always thought strongly that it was not. The example is often given of 2-d...
May20-14 09:14 PM
BensonBear
64 2,272
Hello all, Brand new member here. I am trying to fully understand the different kinds of masses, i.e. rest mass,...
May20-14 04:40 PM
berkeman
29 1,743
In a Bianchi IX universe the metric must be invariant under the SO(3) group acting on the 3-sphere. Hence, the metric...
May20-14 07:50 AM
Bill_K
4 325
In a spatially homogeneous model, spacetime is filled with a one-parameter set of invariant hypersurfaces H(t)....
May20-14 06:03 AM
Bill_K
2 363
I posted about this on a muber of threads, but answers I red didn't really made me clear some confusion about this, so...
May20-14 03:58 AM
analyst5
89 3,112
I'm a high school chem and physics teacher, participating in a recreational online chem course hosted by MIT. One...
May20-14 01:39 AM
PAllen
91 2,127
This is basically a follow-up to some questions from a previous thread regarding Einstein synchronization and other...
May19-14 04:10 PM
analyst5
10 473
would time dilation occur if for example, i was making a hydrogen atom spin with the center of spin the atom? would...
May19-14 03:40 PM
mfb
1 251
Is it possible for a riemann manifold to change its curvature? In practice could the universe in general change its...
May19-14 01:42 PM
WannabeNewton
15 404
Can we define a threshold velocity V for an object with mass(rest) M which the object at motion need to attain so that...
May19-14 08:15 AM
T.M Masike
4 354
In my book it says that the Lorentz group O(3,1) includes 'discrete reversals of the time direction'. What on earth...
May18-14 10:21 PM
Aziza
3 264
Mathematically, ##T_{\mu_\nu} = 0## ##\Rightarrow~R_{\mu\nu} - \frac{1}{2} R g_{\mu\nu} = 0## Now multiply both...
May18-14 09:25 PM
simoncks
11 393
I am intrigued to see what spacetime curvature is like in reality. Most images or ways to imagine it tend to look at...
May18-14 08:08 PM
homeomorphic
11 581
I think this is a relativity/frame of reference discussion and not QM but if I've got it wrong perhaps a mod can home...
May18-14 06:39 PM
DaleSpam
11 651
I have been doing a lot of regarding about relativistic physics since my earlier posts and I think I now understand...
May18-14 03:30 PM
pervect
9 335
Hi! I have been pondering a scenario involving a paradox with length contraction. I brought it up with my physics...
May18-14 03:15 AM
ghwellsjr
51 2,137
Hello Everybody, It is quite good experience to spend time on this helpful forum, but I am posting here for the...
May18-14 02:27 AM
bushramajeed
0 295
I'm a high school student and I don't know much about this stuff e.g. the Higgs Field but i know that the Higgs field...
May18-14 01:28 AM
Matterwave
4 412
On the spacetime manifold in general relativity, one chooses a basis at a point and express it by the partial...
May17-14 02:59 PM
Matterwave
2 236
Hawking said that the horizon area of a black hole never decreases and illustrated that in his Hawking Are Theorem: ...
May17-14 12:22 PM
PeterDonis
5 262
Hello, I'm going through Landau and Lifshitz "The Classical Theory of Fields" this summer with a friend and in section...
May16-14 11:11 PM
electricspit
3 293
If g_{ab},0 = 0 (g does not depend on time), then the manifold must have a timelike killing vector. How can one...
May16-14 03:23 PM
PeterDonis
3 326
When a particle is traveling very close to c. Will its mass actually increase and therefore its ability to resist...
May16-14 01:43 PM
Doc Al
18 626
Suppose that we have a body that is moving at a straight line, inertially wrt to another frame. If it starts to move...
May16-14 12:20 PM
WannabeNewton
40 1,255
In Bianchi IX, the isometry group is the group that admits the same lie algebra as the lie algebra of SO(3). What...
May16-14 04:34 AM
befj0001
0 253
All Bianchi type spacetimes have metrics that admits a 3-dimensional killing algebra. They are in general not...
May16-14 01:13 AM
befj0001
7 467
If a a object is falling in a gravity field with infinitly long radius. can it eventually travel faster than the speed...
May15-14 02:53 PM
xox
34 1,728
I know several raytraycing results for static Schwarzschild black holes, but I have never seen something similar for...
May15-14 10:49 AM
tom.stoer
8 634
hello i want to derive the Transformation of acceleration between two reference frames i searched in internet and...
May15-14 09:20 AM
xox
11 426
I'm reading an old article published by Kaluza "On the Unity Problem of Physics" where i encounter an expression for...
May15-14 07:58 AM
Bill_K
3 254
We know the equation E=pc or P=mc both of them are avaliable for photon.But photon is a massless particle.How can that...
May14-14 01:03 PM
DaleSpam
18 844
While contemplating the twin paradox the thought occured to me that every observer should see the universe as being...
May14-14 11:50 AM
pervect
19 638
I've researched about it and watched a few videos, but I can't seem to get my head around it. Would saying that "it's...
May14-14 08:08 AM
DaleSpam
55 2,506
First off I'd like to say my understanding of physics isn't very good, so I'm sorry if this question is a non...
May13-14 09:36 PM
DaleSpam
10 548

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