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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 40,472
The section of the Usenet Physics FAQ titled "Experimental Basis of Special Relativity" has been cited here many...
Dec31-07 02:06 AM
0 40,129
Hello everyone! My question is this: Do we believe time is a constant and forces such as gravity affect our perception...
T 01:27 PM
28 1,123
If velocity is relative and if we cannot say which is moving away from what *objectivley, how do we say that time...
T 12:20 PM
46 969
According to Einstein (e.g. in his book The Meaning of Relativity), a clock rotating about a central clock will be...
T 10:44 AM
18 752
As you may already know, given a time-like congruence describing some extended body with world-tube ##\mu## embedded...
T 09:30 AM
15 1,488
I was wondering why can't I use formulas from the "Special Relativity" in cases like: F=mv^2/r Or F=qvB...
T 12:56 AM
2 122
Are there any EXACT solutions similar to Schwarzschild or Kerr in a spacetime which is not asymptotically flat; e.g....
Y 01:36 PM
George Jones
3 298
Hello everyone. I am attempting to teach myself about special relativity, and have learned a derivation for the...
Y 01:31 PM
8 338
I got stuck in deriving the velocity of the particle from the acceleration equation. Here are the details of the...
Jul20-14 10:07 PM
6 445
Hello. I'm a layperson curious about physics. I've read that Quantum Gravity could eliminate the predicted...
Jul20-14 06:22 PM
11 655
I have recently gone over the derivation of the stress energy momentum tensor elements for the special case of dust....
Jul20-14 04:42 PM
4 338
*Edit: I noticed I may have posted this question on the wrong forum... if this is the case, could you please move it...
Jul19-14 10:23 AM
8 1,049
its been years since I took a physics course so I might have what amounts to a really dumb question. However, I got...
Jul19-14 10:21 AM
19 633
Hi I am a new(ish) student of general relativity. I am currently reading 'Relativitiy DeMystified' However...
Jul19-14 03:58 AM
1 265
Hi, I'm trying to derive the displacement of an object with proper acceleration (constant) α. t is our laboratory...
Jul18-14 06:45 PM
2 341
Hi I am teaching myself GTR from Dirac's book...
Jul18-14 04:00 PM
3 326
Starting at the beginning and have been having some difficulty explaining the implications of the constancy of the...
Jul18-14 03:30 PM
3 343
So as the title says, what are the physical reasons behind requiring the connection between tangent vector spaces to...
Jul18-14 10:53 AM
27 1,493
Hello Everyone, I am new to this forum. I understood from sources that space-time is like a fabric. The massive...
Jul18-14 07:48 AM
16 1,295
What does spacetime curvature means?
Jul18-14 05:03 AM
13 409
Hi everyone, I just wanted to share this really cool game MIT Game Lab made, it's called A Slower Speed of Light:...
Jul18-14 03:15 AM
3 682
Assume observer is located on the surface of the earth with a small amount of time dialation due to gravity. There are...
Jul17-14 11:21 PM
2 354
In "The Hidden Reality", Brian Greene mentions almost off-hand that inside the event horizon of a black hole, space...
Jul17-14 08:22 PM
9 1,040
Is it possible to assume relativity is still basically correct and reject the b-theory of time? Or does a coherent...
Jul17-14 05:13 PM
Vanadium 50
2 352
Hello Forum, An event is a point in spacetime with spatial coordinates and a time coordinate: (x,y,z,t). An event...
Jul17-14 11:33 AM
7 634
Please excuse me for being a complete and utter pleb, my meager knowledge of Leonard Susskind's holographic principle...
Jul16-14 04:59 PM
8 870
Suppose you have a differentiable manifold where at each point you have attached a set of basis vectors...
Jul16-14 10:50 AM
George Jones
8 747
Hello everybody. I would like to kindly ask your help with a hypothetical hairy question about which I think a lot...
Jul16-14 03:08 AM
5 605
From what I understand the Piezoelectric effect occurs when there is a change in dipole moment. If a crystal was to be...
Jul16-14 12:46 AM
0 528
I have pretty much learned how to derive the left side of Einstein's field equations now (the Einstein tensor that...
Jul15-14 06:21 PM
7 869
Dear All, I am trying to calculate the Riemann tensor for a 4D sphere. In D'inverno's book, I have this equation...
Jul15-14 03:50 PM
25 1,237
Suppose we have a test mass located at some point above the earth. It is allowed to free fall down toward the earth. ...
Jul15-14 02:12 PM
6 602
The variation of the Einstein Hilbert action is usually done in coordinate basis where there is a crucial divergence...
Jul15-14 06:30 AM
center o bass
4 979
I am slowly learning more and more about physics, but one issue I've come across is understanding how gravity can have...
Jul15-14 04:47 AM
10 1,139
The example given is as follows : we have 3 space ships(numbered from left to right) placed in space moving at...
Jul15-14 01:37 AM
7 832
Hi, I am new here, I am no physicist and I'll admit have not read much on physics, but I do have a keen interest and a...
Jul14-14 05:15 PM
26 2,006
hy, there is nothing in Maxwells equations that would limit the speed of light. the only way one can get light...
Jul14-14 07:20 AM
46 5,902
I've gone though a lot of google searches and couldn't find the reason why one way speed of light is undefined. All i...
Jul13-14 01:09 PM
8 1,014
Hi all. It is well known that in Schwarzschild space-time, a torque-free gyroscope in circular orbit at any...
Jul13-14 12:54 PM
5 1,144
Dear all, As I was reading my book. It said that the line element of a particular coordinate system (spherical) in...
Jul12-14 06:12 PM
9 866
Greetings, I have been reading William Baylis - "Electrodynamics - A Modern Geometric approach". For anyone who has...
Jul12-14 02:56 PM
HJ Farnsworth
0 697

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