Sub-Forums : Special & General Relativity Search this Forum

### Relativity FAQ

Mar11-14 10:20 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
 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 08:40 AM ZapperZ 1 37,474 The section of the Usenet Physics FAQ titled "Experimental Basis of Special Relativity" has been cited here many... Dec31-07 02:06 AM jtbell 0 37,211 The notion of parallelism between a vector and a covector comes up naturally in the following context. Say you have a... Dec17-13 09:14 AM stevendaryl 9 502 Hi all, I'm sure that things similar to this have been covered before. Also, I'm sure that a Minkowski diagram... Dec17-13 08:45 AM ScottTracy 11 707 I recently posted another thread on the General Physics sub forum, but didn't get as much feedback as I was hoping... Dec17-13 03:39 AM Bill_K 4 528 Is there a single equation that can model both spacial and temporal metric contraction simultaneously? And also what's... Dec16-13 04:31 PM berkeman 30 585 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 09:54 AM stevendaryl 99 5,848 Hello, I have the Perimeter Institute Activity Package on Special Relativity and I am working through the problems... Dec15-13 07:53 PM Simon Bridge 9 783 Hi I have buyed the book Spacetime physics - Introduction to Special Relativity; Second Edition. It is a great... Dec15-13 01:45 PM jtbell 1 832 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 12:35 PM Vanadium 50 14 729 In linearized gravity we can one sets $$(1) \ \ g_{\mu \nu} = \eta_{\mu \nu} + h_{\mu \nu}$$ where h is taken... Dec14-13 10:35 AM Bill_K 2 515 Am I correct in my understanding that two objects moving away from each other movee away from each other at the speed... Dec14-13 10:13 AM Naty1 3 578 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 07:06 AM Bill_K 6 700 I am studying relativity by myself. There is one problem in the book which says that the 4-dot product of the... Dec13-13 04:31 AM vanhees71 3 781 Hi All, I studied about Michelson Morley experiment in my graduation in the compulsory Physics paper. I had... Dec13-13 03:14 AM TumblingDice 25 1,374 in relativity theory, in a certain "rapid space" the distance between two neighboring points is given by- ds=√... Dec12-13 11:49 PM nafizamin 6 606 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 04:46 PM Bill_K 18 1,284 This question has been asked two years ago, but it wasn't resolved (I think). Here goes This problem is Problem 5... Dec12-13 03:09 PM Bill_K 1 455 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 05:46 PM tom.stoer 10 938 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 07:34 PM pervect 67 3,208 What is the defining moment when you use relativistic equations instead of classical ones? I have heard something as... Dec10-13 01:41 AM Blackthorn 3 524 The approach taken in linearized gravity seems to be to 'perturb' the 'Minkowski metric' such that g_{\mu \nu} =... Dec9-13 07:00 PM WannabeNewton 1 463 Hi, I know these questions must sound ridiculous and I apologize, I'm a newbie. My textbook says that the inner... Dec9-13 01:27 PM sciencegem 3 566 Huffingtonpost ran a story heaping praise on a guy for demonstrating GR with the old "rubber sheet" analogy. This demo... Dec9-13 12:15 PM WannabeNewton 18 1,226 Hi people, I have the following question: First, here is a concise statement of the major neutrino speed... Dec9-13 05:51 AM Vanadium 50 6 586 Gentlemen- What does the stress-energy tensor describe? The tt term of the stress-energy tensor expresses energy... Dec8-13 08:09 PM Simon Bridge 13 974 How do we know a "photon" is massless? Do we have any experimental proof? Photon has momentum, it even bends in... Dec8-13 01:04 PM PeterDonis 10 914 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 05:24 AM K^2 18 1,513 Hi guys, I am reading griffiths electrodynamics. I have a question. How does Maxwell equation suggest that the... Dec8-13 02:22 AM Rena Cray 9 986 In various other threads we have been kicking around various equations for a spherical shell and discussing the... Dec7-13 10:39 PM PeterDonis 7 820 Hello Everyone, I came here with a question and hope you can shed some light. We know that Ricci tensor which... Dec7-13 10:15 PM vaibhavtewari 4 397 Hi, In classical and quantum physics and even in special relativity, shifting the energy of a system by a constant... Dec7-13 10:44 AM George Jones 28 1,247 I know about the Michaelson-Morley expt. trying to measure the speed of light, once in the direction of motion of the... Dec7-13 01:25 AM ghwellsjr 2 588 hi people! please can any one explain me the conclusions of a thought experiment given below ? consider yourself... Dec6-13 09:18 PM PeterDonis 8 950 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 10:30 AM TomServo 7 625 Would there be a direct proof of the energy-stress tensor of general relativity? My lecturer only provides me with a... Dec5-13 10:23 PM WannabeNewton 8 640 Consider two iron rods of about 10 metres separated by 10 metre. They are in series position and not connected in... Dec5-13 07:40 AM DaleSpam 39 1,738 Please view the following... http://www.wimp.com/visualizegravity/ This is the way scientists try to explain the... Dec4-13 09:48 PM dauto 2 684 The Lorentz group generators, in any representation, satisfy the commutation relation = i \left( g^{\nu... Dec4-13 05:16 PM spookyfish 7 852 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 02:54 PM George Jones 8 920 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 02:11 AM dvf 2 460 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 02:59 PM WannabeNewton 16 932