# 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 Views: 121,863 Announcement: Follow us on social media and spread the word about PF! Jan16-12 Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a... Feb23-13 08:40 AM ZapperZ 1 41,634 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 41,284 I know that magnetism can be explained as the relativistic interaction between say a current, and a moving charge. My... Dec22-13 04:32 PM Bill_K 9 891 What little I've read about Einstein, out of a textbook, regarded his theories on motion at the speed of light. I'm... Dec21-13 07:02 PM Simon Bridge 69 2,415 Schwarzschild solution for Planetary Motion: ##g_{ij}= \left( \begin{array}{cccc} \frac{1}{(1-(\frac{2*m}{r}))}... Dec21-13 02:35 PM DaleSpam 1 420 I would like some information concerning GR and the dimensional contraction of a standard rod due to gravity. As the... Dec20-13 06:18 PM PeterDonis 6 731 So in special relativity we have ds'^{2}=ds^2, which is another way of saying \Lambda^{T}\eta\Lambda=\eta. Where... Dec20-13 08:11 AM PeterDonis 22 937 Hey Guys! I've got an exciting question! It's been burning on my mind for years, but I think I can formulate it... Dec19-13 06:46 PM Simon Bridge 7 900 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... Dec19-13 03:50 PM tartaneto 9 910 This is in response to the closed thread "perspective on Relativity and length contraction" The Loedel drawing is a... Dec19-13 11:09 AM phyti 0 512 Hello All, I like to think that I have a decent background in physics and related material, but I confuse myself... Dec19-13 05:51 AM DaleSpam 200 8,473 Hello everyone! There is a postulate of special relativity that says that the speed of light in vacuum is the same... Dec19-13 12:58 AM ViolentCorpse 15 937 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 04:30 PM tiny-tim 6 735 Hi, Does somebody know a link where the Einstein tensor is fully written out, i.e. only containing the metric and... Dec17-13 02:05 PM bapowell 3 521 PLEASE NOTE: When replaying these animations, click on the circular arrow in the bottom left corner of the video... Dec17-13 01:14 PM Histspec 5 1,776 Well, relativity says whatever moves, it's volume shrinks and mass increases (as observed). So if i am traveling at... Dec17-13 09:20 AM ZapperZ 4 647 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 9 608 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 11 833 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 4 679 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 30 781 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 11,412 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 9 866 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 1,000 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 14 886 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 2 566 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 3 652 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 6 820 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 3 891 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 1,582 in relativity theory, in a certain "rapid space" the distance between two neighboring points is given by- ds=√... Dec12-13 11:49 PM nafizamin 6 727 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 1,590 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 1 545 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 1,046 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 3,861 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 3 568 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 1 529 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 3 669 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 1,563 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 6 625 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 1,054 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 1,122 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 2,088