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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 37,356 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 37,122 in relativity theory, in a certain "rapid space" the distance between two neighboring points is given by- ds=√... Dec12-13 11:49 PM nafizamin 6 595 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 1,277 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 1 449 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 10 932 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 3,177 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 3 520 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 1 456 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 3 560 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 1,206 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 6 582 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 13 968 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 10 902 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 1,497 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 9 970 In various other threads we have been kicking around various equations for a spherical shell and discussing the... Dec7-13 10:39 PM PeterDonis 7 810 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 4 391 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 1,240 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 2 582 hi people! please can any one explain me the conclusions of a thought experiment given below ? consider yourself... Dec6-13 09:18 PM PeterDonis 8 946 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 7 617 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 8 637 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 1,710 Please view the following... http://www.wimp.com/visualizegravity/ This is the way scientists try to explain the... Dec4-13 09:48 PM dauto 2 680 The Lorentz group generators, in any representation, satisfy the commutation relation = i \left( g^{\nu... Dec4-13 05:16 PM spookyfish 7 844 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 8 916 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 2 451 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 16 925 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 09:11 AM PeterDonis 11 672 There is any field in General Relativity(I know gravitational field but it is not that which I mean) Thanks Dec3-13 09:09 AM WannabeNewton 2 476 Hello all, I have a geodesic equation from extremizing the action which is second order. I am curious as to what... Dec2-13 02:29 PM Bill_K 7 474 SR question ( 1 2 3) First of all, Happy Thanksgiving to you all! Now, my question: I'm on earth viewing through a telescope. I... Dec2-13 10:09 AM ghwellsjr 44 1,450 Most of the paradoxes are solved by either "Relativity of simultaneity" or "Born rigidity" And there is a 3rd tool... Dec2-13 06:07 AM AndrzejK 60 3,022 Hi, I'm new posting to these forums, so I'm not sure if this is in the right place. Anyway, here it goes: I've... Dec1-13 11:57 PM yogi 40 2,436 Hi, GR permits wormholes hypothetically right? But surely they should violate conservation of energy because if one... Dec1-13 08:03 PM WannabeNewton 1 498 I'm very noob at this and am a bit confused: Formula 1: E_T = \gamma \cdot m c^2 Formula 2: p = \gamma m v... Dec1-13 05:41 PM PAllen 9 850 We have three observers. The A is in earth,B is into a car that runs with big speed,C is out of galaxy. All... Dec1-13 03:18 PM Nugatory 7 441 I had always thought that length contraction meant that the object itself shrunk but I stumbled across an article... Dec1-13 01:47 PM Superposed_Cat 8 556 hi there, In this Ex ( see attached snapshot ), point b), the poisson bracket equation is not so straightforward to... Nov30-13 12:25 PM WannabeNewton 9 496 I mean the application,such as because of the time dilation, humans can observe some particles which don't have long... Nov30-13 10:47 AM phinds 2 396 My understanding is that an outside observer sees objects undergo time dilation as they approach sources of gravity,... Nov30-13 10:25 AM WannabeNewton 10 710