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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
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The section of the Usenet Physics FAQ titled "Experimental Basis of Special Relativity" has been cited here many...
Dec31-07 02:06 AM
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The Pauli-Lubanski spin 4-vector for a particle in its rest frame is given by Sμ = (0, Sx, Sy, Sz). (Note this is the...
Dec22-12 11:35 AM
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I was wondering if the electrons change to Tau electrons when an object reaches close to the speed of light. From my...
Apr20-13 06:48 AM
Vanadium 50
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Hey guys. I have a question regarding exercise 6.5 in MTW ("Radar Distance Indicator"). The exercise asks the...
Jan4-14 01:12 AM
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I'm trying to follow this proof/derivation in Relativity demystified basically the book is showing transformations and...
Jul26-09 08:03 PM
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The Schwarzschild Solution to Einstein's Field Equations for gravity are said to be exact when outside a spherically...
Sep13-09 04:02 PM
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My question is, which photon is the one that first hits the square in the following example If I had a large...
Jan11-10 07:35 PM
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As long as there is any energy/mass at all in our universe, time will always be in a "slowed" state. So, let's say we...
Feb26-11 03:42 AM
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I am thinking about train paradox here. The only difference between the passenger and the person waiting at the...
May21-11 11:38 PM
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Hey guys The lab manual for the class is found here ...
May22-13 03:26 PM
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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
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I'm not really a physics genius or professor so forgive my lack of knowledge. I was thinking about Einstein's theory...
Aug4-10 01:36 PM
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So if you were to take the twin paradox, but make it so instead of the ship turning around and going to earth, the...
Nov18-10 12:31 AM
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I recently watched a documentary on Albert Einstein that said the inspiration (or epiphany I guess) for the slowing of...
Jul27-12 11:15 PM
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Ok, this should be an easy one but it's driving me nuts. When we take the Lorentz transformations and apply them to...
Aug1-13 04:29 PM
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What I mean to say is that as SR predicts time dilation, do the biological processes also slow down? Suppose A and B...
Oct12-06 09:50 PM
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I just finished watching a hawkins program about time travel that theorized that the faster an object travels through...
Aug28-10 08:18 AM
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Two spacecraft in inertial motion have relative velocity .5c. The ships have identical "grandfather" clocks very much...
Mar30-11 05:54 PM
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Let me phrase the entire question: How is acceleration equivalent to rest in a gravitational field (without tidal...
Apr3-13 12:38 PM
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I have just recently began to understand relativity, right now I get time dilation and lenght contraction but I do not...
Jan4-09 11:02 AM
12 1,009 example that is commonly used in physics and my response for it. Is light actually passing him at...
Mar20-09 10:47 PM
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In my cosmology lectures they say that a negative curvature gives an infinite space but I was thinking what about the...
Feb19-10 07:06 AM
George Jones
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From Box 3.3, p. 85: Since S^{\alpha}_{\phantom{\alpha}\beta\gamma} = S(\omega^\alpha, e_\beta, e_\gamma) ...
Aug3-10 05:20 AM
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I'm starting a new thread on this because my search of this forum indicates that the most recent thread was in 2006...
Mar23-11 08:20 AM
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\theta_o-\theta_s does not vary linearly with changes of v/c. cos (y+b) = ((cos (y) - x)/(1 - x cos(y))) ...
Mar1-12 02:08 PM
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Imagine Batman has a new hyper speed Batship that is the shape of his circular bat emblem. The ground has convenient...
Apr19-12 10:40 AM
Adel Makram
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While explaining how science works in my biology class my biology teacher said that relativity had been proved wrong,...
Dec19-12 03:19 PM
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Has any experiments been done equal to this scenerio where the twin leaving earth and seeing earth time dilated.. but...
Dec29-12 11:02 AM
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Dear Friends, Discussion of the Einstein's Special Relativity clock paradox is often complicated by the role of...
Jul4-13 11:50 AM
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The last paragraph of states this conclusion: See these...
Oct2-05 05:12 PM
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Hello all, I, by no means, fully understand general relativity. I was wondering if one of you experts could help me...
Jun1-07 04:40 PM
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There are many derivations of E=mc2 out there, but did Einstein actually used Minkowski space time for his original...
Aug12-10 08:25 AM
Petr Mugver
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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
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If you are travelling very very fast in a space ship, are there any visual effects produced by general relativity that...
Nov8-11 05:39 AM
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Hi, I've read that the speed of light is consistent for all observers, no matter where they are. So, for instance,...
Jan10-14 06:20 PM
18 1,008
In time dilation and length contraction, there is a velocity term. How do we measure velocity at the first place?
Dec16-03 09:35 AM
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Does anyone know of a reference (or website) where I can find the Ricci tensor/scalar for a static, circularly...
Nov24-04 03:38 PM
big bob
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Let's say we have a ship following a buoy toward earth. The ship and buoy are at rest relative to each other, a...
Jun21-06 11:26 AM
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Fermat's principle states that light travels the path of stationary time, I've read up on this from several sources...
Jul29-10 10:44 AM
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Hi, When we define a manifold, and in particular define what a chart is, one of the conditions we specify is that...
Oct14-10 06:30 PM
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Hagen Kleinert, in his book, Path Integrals in Quantum Mechanics, Statistics, Polymer Physics, and Financial Markets,...
Dec27-11 10:08 PM
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