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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
Mar11-14 10:20 AM bcrowell 
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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
1 40,701
The section of the Usenet Physics FAQ titled "Experimental Basis of Special Relativity" has been cited here many...
Dec31-07 02:06 AM
0 40,352
I thought it would be interesting to show how light moves in a Coke bottle: -fSqFWcb4rE&hd Is the speed of light...
Dec27-11 01:20 PM
Doc Al
2 1,000
Hagen Kleinert, in his book, Path Integrals in Quantum Mechanics, Statistics, Polymer Physics, and Financial Markets,...
Dec27-11 10:08 PM
2 1,000 i would love to witness something like this, i still dont quite...
Jun5-08 04:37 PM
1 999
What physical meaning can be ascribed to the non-divergence of the Einstein tensor? I find it counterintuitive since...
Jun11-08 06:53 AM
3 999
according to mass-energy equivalent theorem, Regardless of whether the object is at rest or moving, the object of mass...
Apr15-10 02:01 AM
4 999 Can someone explain the following statement on page 2 of...
Jan13-12 08:12 AM
2 999
Given a particular system, how would one construct the stress-energy tensor? I was reading Mallett's paper and the...
Dec30-13 02:55 AM
15 999
there are many small womholes that are continuously created throught time, they may nto remain open for long enough...
Jul2-05 10:59 PM
1 998
does anyone have any equations for calculating time travel without an accelration close, equal or greater than the...
May15-06 11:09 AM
3 998
We'll know that the base of special relativity theory is "the light has a constant speed in vacuum". Time dilation...
Sep13-09 05:34 PM
4 998
According to the twin parodox scenario, when a twin goes in a rocketship and it travels near the speed of light and...
Feb4-10 08:36 AM
1 998
Suppose there is a solution to the field equations with the Einstein Tensor = 1: Gtt = 1 and/or, Gxx = Gyy =...
Apr16-11 09:36 PM
3 998
Hello! I'm trying to get my head around general relativity at the moment...(!), and there's one aspect of it that's...
Apr24-11 08:56 PM
6 998
Is there an equation to figure out how much time would pass traveling light speed for 10 years relative to the person...
Jan29-12 11:57 PM
3 998
What is the reason for not attempting to both generate and detect gravity waves in a laboratory? I mean if Eotvos...
Jan5-09 11:02 AM
9 997
Hi I am curious about a few things i have read about light and would appreciate some help. First of all to my...
Sep9-10 10:42 AM
3 997
Hi, I can't say I've really ever done much relativity but this made me wonder. Imagine we have some frame...
Nov19-10 11:58 AM
1 997
I would like to ask, how these identities are true ...
Mar11-11 04:36 AM
2 997
Ok, I know you all probably get a ton of lame questions about time travel so I thought I'd add another. If I...
Apr29-06 12:10 PM
5 996
Here's something for the phone book's fans to chew on: Surprisingly, on page #1278, in the index entry "Torsion",...
Nov27-06 04:24 PM
Chris Hillman
2 996
If I was travelling 60% of light speed in one direction, and you were travelling 60% of light speed in another...
Dec17-07 07:33 AM
2 996
The item of gravitational redshift in the WIKIpedia says that this redshift is referred to the light of others forms...
Jun20-09 06:36 AM
5 996
Anti-de Sitter spacetime has the problem of closed timelike curves, which one can solve by somehow unfolding the...
Sep8-09 01:48 PM
0 996
let's say a train is traveling at relativistic speed along a straight line to right, and a man is standing in the...
Jan21-11 09:05 AM
3 996
Hi... I have just started using GRtensor.... I realize that the calculations in GRtensor have to be done only...
Jun23-11 11:42 PM
krishna mohan
3 996
We have two clocks within a laboratory. We put one on the table and the other in a centrifuge made of glass so we can...
Apr22-13 05:45 PM
5 996
Hi all. I'm a run-of-the-mill layman—not a student. I've just developed an interest in physics lately and have been...
Jan26-14 10:33 AM
20 996
I have read some basics knowledge about General Relativity and I see that it deal perfectly with gravity. But what...
Jul1-14 08:27 AM
6 996
From the Cosmic Variance blog
Sep19-05 10:32 PM
1 995
ok so i am 21 i am in the military i read some books that had quantum mechanics in it and i immediately became sucked...
Feb4-09 06:16 AM
10 995
Dear all, First, please forgive my english, I am French. In most textbooks on general relativity (GR) the non...
Apr18-10 07:16 PM
3 995
Hello. Is there a way, as for the energy frame, to get the particle frame 4-velocity of a fluid from its...
Feb7-12 06:13 PM
5 995
I've been playing with the idea of seeing how far I can get with general relativity without resorting to the learning...
Feb19-12 12:27 AM
1 995
Let me phrase the entire question: How is acceleration equivalent to rest in a gravitational field (without tidal...
Apr3-13 12:38 PM
12 995
Hi, I'm trying to understand what the nature of gravity is. I know it is a force, and I know that heavy objects tend...
Jun11-14 05:32 PM
16 995
I'm starting to get (Already am) really annoyed at how it is impossible to find an answer to what gravity is. For...
May20-13 10:40 AM
11 994
Is it accurate that general relativity may predict nonlinear but not chaotic spacetime?
Jan14-09 10:44 AM
Loren Booda
2 994
A thought exercise: You have entangled particles, leave one on Earth and put the other on a spaceship that is moving...
May11-09 02:41 AM
2 994
If you had two synchronized clocks in two side by side elevators, and one sat on the surface of the earth in 1 g for...
Sep6-13 02:49 PM
14 994
Hey guys. I have a question regarding exercise 6.5 in MTW ("Radar Distance Indicator"). The exercise asks the...
Jan4-14 01:12 AM
12 994

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