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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: 122 Announcement: PF Member Award voting is open! Dec12-13 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 35,167 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 35,002 Am I correct in my understanding that two objects moving away from each other movee away from each other at the speed... T 12:49 PM ilikescience94 2 106 Hello All, I like to think that I have a decent background in physics and related material, but I confuse myself... T 09:34 AM ghwellsjr 162 3,412 In linearized gravity we can one sets $$(1) \ \ g_{\mu \nu} = \eta_{\mu \nu} + h_{\mu \nu}$$ where h is taken... T 08:30 AM center o bass 0 147 As I understand it, the value of a 4-vector x in another reference frame (x') with the same orientation can be derived... T 08:06 AM Bill_K 6 299 I am studying relativity by myself. There is one problem in the book which says that the 4-dot product of the... T 05:31 AM vanhees71 3 437 Hi All, I studied about Michelson Morley experiment in my graduation in the compulsory Physics paper. I had... T 04:14 AM TumblingDice 25 760 in relativity theory, in a certain "rapid space" the distance between two neighboring points is given by- ds=√... T 12:49 AM nafizamin 6 267 I'm debating whether this should go in the GR & SR section, but anyways, I heard both claims and both of them are... Y 05:46 PM Bill_K 18 746 This question has been asked two years ago, but it wasn't resolved (I think). Here goes This problem is Problem 5... Y 04:09 PM Bill_K 1 138 - - - 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 10 576 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 2,076 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 3 296 Hi guys. I have something stuck in my head since a few days and I'd like to have your opinion about that. I don't know... Dec9-13 08:05 PM Simon Bridge 8 359 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 1 213 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 3 293 Hi, Car is moving at speed v. The pulse is sent inside from the back to the front. It takes time t. Another pulse is... Dec9-13 01:16 PM Nugatory 24 780 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 18 570 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 6 373 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 13 697 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 10 585 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 1,063 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 9 622 In various other threads we have been kicking around various equations for a spherical shell and discussing the... Dec7-13 11:39 PM PeterDonis 7 499 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 4 211 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 28 805 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 2 396 hi people! please can any one explain me the conclusions of a thought experiment given below ? consider yourself... Dec6-13 10:18 PM PeterDonis 8 743 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 7 412 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 8 374 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 1,188 Please view the following... http://www.wimp.com/visualizegravity/ This is the way scientists try to explain the... Dec4-13 10:48 PM dauto 2 459 The Lorentz group generators, in any representation, satisfy the commutation relation = i \left( g^{\nu... Dec4-13 06:16 PM spookyfish 7 588 Hello there! I have a more or less silly and possibly obvious question that's been bugging me a lot. Here's the... Dec4-13 03:54 PM George Jones 8 742 Given a particular system, how would one construct the stress-energy tensor? I was reading Mallett's paper and the... Dec4-13 09:28 AM WannabeNewton 11 416 Hi, Is it pure coincidence that if you put ##c=v_e=\sqrt{2GM/R}## in the escape velocity, you end up with the... Dec4-13 03:11 AM dvf 2 262 Hi all, think this might be a silly or trivial question but I've got myself in a bother so thought I'd get some help.... Dec3-13 03:59 PM WannabeNewton 16 734 For example let's say i have two rods of same length ie. 4metres placed in a series position. They are separated by a... Dec3-13 10:11 AM PeterDonis 11 422 There is any field in General Relativity(I know gravitational field but it is not that which I mean) Thanks Dec3-13 10:09 AM WannabeNewton 2 313 Hello all, I have a geodesic equation from extremizing the action which is second order. I am curious as to what... Dec2-13 03:29 PM Bill_K 7 307