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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 42,286
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 41,917
Does this actually happen in outer space? Do things actually move in uniform motion relative to each other? How...
Dec18-11 03:07 AM
PeterDonis
7 2,734
When accelerating an electron through a PD of 10^3, that will give a momentum of 1 MeV/c right? Or is there something...
Dec17-11 07:32 PM
Stickybees
4 1,125
Imagine a perfectly reflecting box with a homogenous distribution of photons within it with total energy E (not...
Dec17-11 05:31 PM
pervect
1 1,115
After doing some playing around with area lights in raytracing, I realized that the shape of the emitter has a lot to...
Dec17-11 05:22 PM
Elroch
3 2,587
I wanted to double check my calculations an interpretation of relativity. Thanks in advance. Two identical ships...
Dec17-11 03:39 PM
Fredrik
3 1,295
Good morning. I would like to prove that the integral h^{\mu \nu} (\vec{r},t) = \int d \zeta \int d^3 \vec{y}...
Dec17-11 02:03 PM
lalbatros
1 1,204
I wonder what the minimum safe distance would be for a black hole with mass of a couple of billion solar masses. With...
Dec17-11 10:44 AM
Tracer
39 6,412
Does the temperature a body depend on its frame of reference? Does the internal kinetic energy depend on frame of...
Dec17-11 03:41 AM
pervect
2 1,381
In general relativity, gravity is modeled as a curvature in spacetime. So the earth moves in a 'straight' path in a...
Dec17-11 12:49 AM
andrebourbaki
29 7,907
Post any thoughts or ideas here.
Dec16-11 11:32 PM
yoron
17 1,796
I've been interested for a while in the nature of space-time. It's been a long time since any body talked seriously...
Dec16-11 11:26 PM
berkeman
2 1,494
In another thread I asked the question if my mass is comprised of "Higgs Mass" and "Kinetic mass". Drakkith was...
Dec16-11 02:02 PM
nitsuj
7 1,314
Something has been bothering me for quite some time and when you cannot figure it out yourself ask a higher power,...
Dec16-11 10:25 AM
PAllen
8 2,838
sorry if this has been discussed before but I've not had much luck finding anything on the forum search. Basically I...
Dec16-11 09:00 AM
Ryan_m_b
2 1,202
What are the equations from which all of GR can be derived? Obviously one of the equations is Einstein's Field...
Dec16-11 08:18 AM
dcpo
4 2,178
I was listening to Feynman on space-time and he challenged the audience to find a paradox in simultaneity over large...
Dec16-11 04:41 AM
Vanadium 50
11 2,041
Last thread that I initiated was titled `Simultaneity is directional while Time Dilation is not', which presented a...
Dec16-11 01:39 AM
universal_101
7 1,727
I like to try and derive little things by myself if I think it is manageable. One such thing is the addition of...
Dec15-11 11:58 PM
nhmllr
4 1,029
Edit. I think the topic is misinformative and I dont know how to change it. Hey I have to translate this into...
Dec15-11 09:50 PM
ghwellsjr
3 1,788
Please note that I do NOT want to discuss whether gravity is a force or the effect of space-time curvature here. If...
Dec15-11 09:00 PM
andrebourbaki
10 4,679
Just wondering if the two are fundamentally linked ? If the universe is in the shape of a 3 sphere and if it's...
Dec15-11 05:15 PM
AugustusM
2 1,555
Do you want to interpret this as a fallacy in relativity? I posted part of this example before. Which is: what if you...
Dec15-11 10:37 AM
discountbrain
32 2,894
I read in the book the elegant universe,that Einstein first saw riemannian geometry in accelerated motion and...
Dec15-11 09:56 AM
MikeLizzi
4 1,267
So what will it see it self as?? At rest or moving a velocity c? Either way it seems to be a contradiction, so does...
Dec15-11 07:56 AM
sri sharan
4 1,413
One can use the Principle of Extremal Aging to calculate the path of a freely moving body (in an inertial frame not...
Dec15-11 07:55 AM
pervect
7 1,554
Hawking and others suggest that it is a very special deal that macroscopic black holes lose quantum information, but I...
Dec15-11 04:10 AM
Elroch
6 1,784
Can you use any of these theories in daily life? Or how can you?
Dec15-11 03:27 AM
michelcolman
25 4,095
*** Please ignore. Just noticed my error !!! *** Ok. Having been beaten senseless untill I can see how the maths...
Dec15-11 02:50 AM
Mike Hobbs
0 948
I have seen PeterDonis state that predictions of GR are expressed as contracted tensors i.e. scalars. And they are...
Dec15-11 01:28 AM
PeterDonis
1 1,802
with the newest discovery of biggest black holes in the universe, i suddenly had this weird thought: what if they're a...
Dec14-11 09:06 PM
nitsuj
3 2,911
Or is this only true when I am viewing someone else's clock? Why does time slow down the faster something travels?...
Dec14-11 06:51 PM
PeterDonis
98 10,517
okay, i am totally confused (again). i ihave a general understanding that the higgs mechanism is the effect which...
Dec14-11 06:00 PM
Drakkith
10 4,332
I have been studying up on special and general relativity lately :) But still a few things aren't clear to me...
Dec14-11 03:24 PM
pervect
1 1,125
I know that GR deals exclusively with tensors (at least, in every book I have), but how does the same concepts of...
Dec14-11 09:16 AM
haushofer
2 1,483
Can anyone please explain the difference between Newtonian and GR when used to describe gravity especially with...
Dec14-11 07:23 AM
LaurieAG
7 1,513
I try to get the gist of the Special and General theories of relativity for more than two years now. And I still don't...
Dec14-11 07:12 AM
ZapperZ
28 2,685
OK, if anyone is so inclined, let's continue the discussion here, since I think we are distracting from the main...
Dec14-11 06:43 AM
juanrga
62 5,336
I tried to find an answer to this here, but may have missed it. There must be a flaw in my understanding here,...
Dec14-11 06:31 AM
harrylin
6 3,008
Howdy, Does light exert gravity? last i heard, eletro-magnetic radiation doesn't have mass, and thus no gravity, yet...
Dec14-11 02:50 AM
jtbell
49 12,608
If we assume: E = mc^{2} and for photons: E = hv Then we can derive an effective mass:
Dec13-11 11:26 PM
Passionflower
2 1,105

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