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### 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 37,471 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 37,207 A thought experiment. C is considered to be a constant speed, that can not be exceeded. Once light passes the event... Sep28-13 10:50 AM Simon Bridge 10 664 At page 234 in Landau and Lifshitz' Classical Theory of Fields the proper time element is defined through the line... Sep27-13 06:29 PM WannabeNewton 11 799 I can't really bring myself to understand why time slows when you travel at high speeds. I tried to think of a graph... Sep27-13 06:09 PM adimantium 14 1,154 I know that if you go an accelerated observer's frame, the 4-acceleration is $$a^\mu=(0,{\bf a})$$ which means the... Sep27-13 05:53 PM dauto 8 562 I've been reading the excellent article from Morris and Thorne: "Wormholes in spacetime and their use for interstellar... Sep27-13 03:02 PM Bill_K 1 314 Is it possible to have a space-time with no killing vector? Alternatively, can I define the metric only with the... Sep27-13 10:09 AM PeterDonis 3 358 So I look at the Minowski diagrams, and I can understand that moving on the y means moving in time, and moving on the... Sep27-13 08:26 AM georgir 32 1,477 In real life when we accelerate we cover every possible speed we can right? Einstein said that it would take an... Sep27-13 08:05 AM .Scott 12 993 OK, here we go. This will sound very dumb, and I accept that fully. Three objects are arranged as follows: We... Sep27-13 07:21 AM choran 16 681 I'm thinking about a flat sheet-like structure approaching a massive object (maybe a black hole?). If it were to... Sep26-13 02:21 PM mfb 6 665 Why the factor of 1/2 in the Einstein-Hilbert action? The Einstein field equation is ... Sep26-13 12:51 PM pellman 2 390 Good day :smile: Black hole White hole The characteristics of these two kinds of wholes are opposite to each... Sep25-13 10:25 PM xcourrier 18 1,159 Hi, some years ago when I was studying Nuclear engineering in Turin ( Italy ), I attended some courses with prof.... Sep25-13 03:04 AM RiccardoVen 11 910 Pythagoras's Theorum is considered to be an ideal. The accuracy of its results are dependent upon the flatness of the... Sep25-13 01:35 AM Dappy 23 1,199 Recently i found a problem with relativity of simultaneity, its a paradox within relativity of simultaneity. It is... Sep24-13 01:41 PM DaleSpam 4 546 hello please see attached snapshot from the book of Ligthmann & al. (problem book in relativity and gravitation).... Sep23-13 02:20 PM dauto 1 408 So let me get this straight once and for all (can that even be possible in physics? lol). In quantum entanglement,... Sep23-13 11:35 AM Nugatory 2 590 Hello! I've had this question for sometime and I'd love if someone could shed some light on it for me. Here's... Sep23-13 10:04 AM yuiop 3 712 I understand that neutrinos move at very near the speed of light and that they have a very small amount of mass. This... Sep23-13 09:56 AM vanhees71 26 1,431 Hello, I would first just like to introduce myself I'm Adrian and I am a grade 11 student so this type of stuff is way... Sep23-13 08:46 AM Bill_K 7 861 I have come across alot of information that says that the speed of light is not the fastest speed that can be reached... Sep22-13 11:27 PM SteamKing 1 557 Hey guys, I was reading that even light can't escape black holes due to the huge gravitational force which they have. ... Sep22-13 07:40 PM Trenton 7 635 In this thread I seek to come to an intuitive physical understanding of the implications and conclusions of the... Sep22-13 02:46 PM PeterDonis 6 621 In relativity of simultaneity, it is said like simultaneous events for one observer is not simultaneous for another.... Sep22-13 06:01 AM harrylin 10 637 Hello guys, The title might be slightly misleading, it's not related to general physics. It's a hypothetical... Sep21-13 09:18 PM Chronos 4 648 During discussions in other threads I have been coming to the conclusion that the idea proposed here may be true. ... Sep21-13 09:11 AM yuiop 24 1,524 Einstein said it would take an infinite amount of energy to move something at the speed of light. Photons move at the... Sep21-13 07:12 AM Greg Bernhardt 6 782 Why doesn't a stationary charge experience a magnetic force? And why does a moving charge produce a magnetic field?... Sep21-13 02:54 AM eightsquare 10 758 Is Einstein's SR a description of observations or a description of reality (or both)? It seems tome the distinction... Sep20-13 10:05 PM DaleSpam 13 695 Appendix 1 - simple Lorentz transformation derivation found at - http://www.bartleby.com/173/a1.html Given in... Sep20-13 05:28 PM The_Duck 5 605 Rotating disk spin off ( 1 2 3 ... Last) Let me apologize in advance for not reading the entire rotating disk thread. I think that the following question is... Sep20-13 03:13 PM Mentz114 82 3,119 I am wondering whether MMX was based on faulty assumptions that light waves would behave like sound waves. 1) What... Sep19-13 09:36 PM PAllen 27 1,944 This has bothered me for some time. In the ADM formulation, we foliate spacetime into 3+1 dimensions by creating 3... Sep19-13 05:50 PM atyy 9 598 Triplet Paradox ( 1 2 3 ... Last) A variant of the classic twin paradox. There are three triplets, who have the boring names of Adam, Bob and... Sep19-13 09:24 AM ghwellsjr 143 15,986 The theory of relativity makes an 'ether' superfluous, but does it challenge the existence of an 'Ether'. Could the... Sep19-13 07:35 AM dauto 10 577 It all started when I read that different inertial observers from the same place at the same time should see same... Sep19-13 07:03 AM rajark 11 677 I assume people much more knowledgeable then me must have already thought this through, but the following line of... Sep18-13 04:06 PM DaleSpam 99 5,047 The path described by a constantly accelerating particle is given by: x=c\sqrt{c^2/a'^2+t^2} where a prime... Sep18-13 02:39 PM luitzen 7 693 Hi Everyone, I've managed to confuse myself with a mutilated thought experiment. A half twin paradox. Imagine a... Sep18-13 12:40 PM phellen 11 760 Hello, after having done a bit of exercices on Taylor & Wheeler ( just for self-study ), I felt the need to go on... Sep18-13 02:26 AM RiccardoVen 39 2,058