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Relativity FAQ

Sep10-12 11:09 AM bcrowell

Special & General Relativity

- Dependence of various physical phenomena on relative motion of the observer and the observed objects. Exp. & theo. theories of relativity
 Views: 8,420 Announcement: Two free ways to get Gold Membership! Jan17-12 Meta Thread / Thread Starter Last Post Replies Views Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a... Feb23-13 09:40 AM ZapperZ 1 36,639 The section of the Usenet Physics FAQ titled "Experimental Basis of Special Relativity" has been cited here many... Dec31-07 03:06 AM jtbell 0 36,497 Traveling on a spaceship to Alpha Centauri A, 4.37 light years away, at a velocity of 0.92 c, if you just calculate... Dec17-13 05:30 PM tiny-tim 6 593 Hi, Does somebody know a link where the Einstein tensor is fully written out, i.e. only containing the metric and... Dec17-13 03:05 PM bapowell 3 441 PLEASE NOTE: When replaying these animations, click on the circular arrow in the bottom left corner of the video... Dec17-13 02:14 PM Histspec 5 1,607 Well, relativity says whatever moves, it's volume shrinks and mass increases (as observed). So if i am traveling at... Dec17-13 10:20 AM ZapperZ 4 570 The notion of parallelism between a vector and a covector comes up naturally in the following context. Say you have a... Dec17-13 10:14 AM stevendaryl 9 467 Hi all, I'm sure that things similar to this have been covered before. Also, I'm sure that a Minkowski diagram... Dec17-13 09:45 AM ScottTracy 11 650 I recently posted another thread on the General Physics sub forum, but didn't get as much feedback as I was hoping... Dec17-13 04:39 AM Bill_K 4 465 Schwarzschild's Metric 1916 ( 1 2 3 ... Last) Our current version of the Schwarzschild metric is d\tau^2=(1-r_s/r)dt^2-(1-r_s/r)^{-1}dr^2-r^2d\Omega^2 where c... Dec16-13 10:54 AM stevendaryl 99 5,119 Hello, I have the Perimeter Institute Activity Package on Special Relativity and I am working through the problems... Dec15-13 08:53 PM Simon Bridge 9 738 Hi I have buyed the book Spacetime physics - Introduction to Special Relativity; Second Edition. It is a great... Dec15-13 02:45 PM jtbell 1 723 If you could create a small space on earth in which a person could fit that was totally unaffected by gravity, or that... Dec15-13 01:35 PM Vanadium 50 14 649 In linearized gravity we can one sets $$(1) \ \ g_{\mu \nu} = \eta_{\mu \nu} + h_{\mu \nu}$$ where h is taken... Dec14-13 11:35 AM Bill_K 2 477 Am I correct in my understanding that two objects moving away from each other movee away from each other at the speed... Dec14-13 11:13 AM Naty1 3 543 As I understand it, the value of a 4-vector x in another reference frame (x') with the same orientation can be derived... Dec13-13 08:06 AM Bill_K 6 623 I am studying relativity by myself. There is one problem in the book which says that the 4-dot product of the... Dec13-13 05:31 AM vanhees71 3 729 Hi All, I studied about Michelson Morley experiment in my graduation in the compulsory Physics paper. I had... Dec13-13 04:14 AM TumblingDice 25 1,299 in relativity theory, in a certain "rapid space" the distance between two neighboring points is given by- ds=√... Dec13-13 12:49 AM nafizamin 6 558 I'm debating whether this should go in the GR & SR section, but anyways, I heard both claims and both of them are... Dec12-13 05:46 PM Bill_K 18 1,233 This question has been asked two years ago, but it wasn't resolved (I think). Here goes This problem is Problem 5... Dec12-13 04:09 PM Bill_K 1 398 Hi, I've taken a course in SR and studied GR on my own, but I do not know how to solve problems of this type. This is... Dec11-13 06:46 PM tom.stoer 10 880 Length Contraction Paradox ( 1 2 3 ... Last) Hi, As is well known, Relativity claims that a rod of a given proper length will appear length contracted when... Dec10-13 08:34 PM pervect 67 3,021 What is the defining moment when you use relativistic equations instead of classical ones? I have heard something as... Dec10-13 02:41 AM Blackthorn 3 506 The approach taken in linearized gravity seems to be to 'perturb' the 'Minkowski metric' such that g_{\mu \nu} =... Dec9-13 08:00 PM WannabeNewton 1 425 Hi, I know these questions must sound ridiculous and I apologize, I'm a newbie. My textbook says that the inner... Dec9-13 02:27 PM sciencegem 3 518 Huffingtonpost ran a story heaping praise on a guy for demonstrating GR with the old "rubber sheet" analogy. This demo... Dec9-13 01:15 PM WannabeNewton 18 1,035 Hi people, I have the following question: First, here is a concise statement of the major neutrino speed... Dec9-13 06:51 AM Vanadium 50 6 563 Gentlemen- What does the stress-energy tensor describe? The tt term of the stress-energy tensor expresses energy... Dec8-13 09:09 PM Simon Bridge 13 943 How do we know a "photon" is massless? Do we have any experimental proof? Photon has momentum, it even bends in... Dec8-13 02:04 PM PeterDonis 10 830 I suspect this is somewhat off the beaten track here, but there may be some few that could give it a go. Einstein... Dec8-13 06:24 AM K^2 18 1,396 Hi guys, I am reading griffiths electrodynamics. I have a question. How does Maxwell equation suggest that the... Dec8-13 03:22 AM Rena Cray 9 915 In various other threads we have been kicking around various equations for a spherical shell and discussing the... Dec7-13 11:39 PM PeterDonis 7 756 Hello Everyone, I came here with a question and hope you can shed some light. We know that Ricci tensor which... Dec7-13 11:15 PM vaibhavtewari 4 362 Hi, In classical and quantum physics and even in special relativity, shifting the energy of a system by a constant... Dec7-13 11:44 AM George Jones 28 1,184 I know about the Michaelson-Morley expt. trying to measure the speed of light, once in the direction of motion of the... Dec7-13 02:25 AM ghwellsjr 2 560 hi people! please can any one explain me the conclusions of a thought experiment given below ? consider yourself... Dec6-13 10:18 PM PeterDonis 8 915 Question in the subject. I have no idea what the DoD's interest is in this. Sorry is this is the wrong forum. Dec6-13 11:30 AM TomServo 7 583 Would there be a direct proof of the energy-stress tensor of general relativity? My lecturer only provides me with a... Dec5-13 11:23 PM WannabeNewton 8 584 Consider two iron rods of about 10 metres separated by 10 metre. They are in series position and not connected in... Dec5-13 08:40 AM DaleSpam 39 1,586 Please view the following... http://www.wimp.com/visualizegravity/ This is the way scientists try to explain the... Dec4-13 10:48 PM dauto 2 640 The Lorentz group generators, in any representation, satisfy the commutation relation = i \left( g^{\nu... Dec4-13 06:16 PM spookyfish 7 785