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### Relativity FAQ

Common Relativity questions, quality answers
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
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 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 35,116 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 34,955 In the regular hall effect we calculate like this F=qE=qvB then E=vB , now we assume our conductor has width d so... Aug3-13 11:40 AM Nugatory 4 526 I’ve got a question. Say we have a medium traveling through a pipe at speed v. The soundspeed of the medium is vs.... Aug3-13 11:19 AM ProfDawgstein 1 385 hi some black holes are inner and outer horizon!! what's this means? inner and outer? what happen between them? Aug3-13 09:13 AM Naty1 3 551 Hello Forum I have constructing a Michelson Interferometer using sodium light. For viewing the fringes, I have used... Aug2-13 11:51 PM itsnaresh 2 400 I was working on a problem where I had to prove that div(B) remains invariant under lorentz transformations. That... Aug2-13 12:55 PM WannabeNewton 16 666 Why 299,792,458 m/s? Why does light travel at the speed that it does? Aug2-13 12:42 PM Integral 7 760 hi penrose diagram is a map that map infinity to finite region I don't know that how can I find this map for... Aug2-13 10:18 AM sadegh4137 0 310 This is a question on the nitty-gritty bits of general relativity. Would anybody mind teaching me how to work these... Aug1-13 06:53 PM WannabeNewton 4 595 Hello guys! According to relativity, objects with higher kinetic energy have larger mass. Would that affect the... Aug1-13 05:48 PM Bill_K 7 558 Ok, this should be an easy one but it's driving me nuts. When we take the Lorentz transformations and apply them to... Aug1-13 05:29 PM SamRoss 4 463 I want to find the ricci tensor and ricci scalar for the space-time curvature at the earth surface. Ignoring the moon... Aug1-13 04:42 PM WannabeNewton 8 493 Hello! Consider the law of addition of velocities for a particle moving in the x-y plane: ... Aug1-13 01:04 PM littleHilbert 5 478 I have come across a problem which is a homework indeed, but i tried to pack this question up so that it is more... Jul31-13 06:26 PM mfb 1 395 Hello, I have read that cosmological redshift means a photon is being stretchedby space dilation and thus gets... Jul31-13 06:07 PM mfb 23 1,190 From previous threads I have understood that crossing the event horizon of a supermassive black hole is nothing very... Jul31-13 04:06 PM ZapperZ 28 1,215 I am reading through this text http://www.ita.uni-heidelberg.de/~dullemond/lectures/tensor/tensor.pdf and am... Jul31-13 02:48 PM dextercioby 4 319 GR is confusing me ( 1 2 3 ... Last) The main problem is when we say a manifold is curved surely this is a relative concept - curved relative to what? I've... Jul31-13 07:45 AM Mentz114 58 2,504 Is there a Metric for the Sun and Earth other than the Schwarzschild Metric who has the Schwarzschild Radius on the... Jul31-13 07:43 AM Mentz114 2 354 This is simply a thought experiment. Say that I had a space craft capable of constantly accelerating or... Jul30-13 11:42 PM PAllen 1 386 Hi, before I question let me say I'm new both to this site and Physics in general, as such please forgive any... Jul30-13 06:44 PM ghwellsjr 2 357 I'm reading Einstein's Cosmos by Michio Kaku, and he describes Kerr black holes; which are apparently rings of matter... Jul30-13 06:20 PM webboffin 18 1,248 I'm interested in reading about the fundamental limits imposed by known physics on distorting spacetime in ways that... Jul30-13 12:02 PM Thinker007 33 1,346 Hello everyone, long time lurker first time poster here. I've been wondering for a while about this: Let's... Jul29-13 10:44 PM Chestermiller 6 486 if gravity arises from normal accelerations due to the curvature of spacetime...what would the opposite of this... Jul29-13 04:46 PM A.T. 40 1,759 Time should have not have happened in infinite gravity of the Big bang Singularity. Einsteins General relativity... Jul29-13 12:46 PM phinds 1 367 Suppose our galaxy, say A, is moving at near the speed of light with respect to another galaxy, say B. (which I think... Jul29-13 10:13 AM nitsuj 68 2,549 Hello! I would like to show that Lorentz transforms with L^{4}_4 \ge 1 preserve the sign of the time-component... Jul29-13 06:37 AM littleHilbert 0 344 The Schwarzenchild and the Kerr Metrics for Black Holes give a Ricci = {}. What does a Ricci Flat mean? It... Jul29-13 06:32 AM andrien 6 346 I thought it was. Here's the response I'm getting, I think time is a constant and space is undistortable (gravity's... Jul28-13 02:27 PM MinnesotaState 8 528 consider have a metric ds^2=f(r,t)dt^2+g(r,t)dr^2+k(r,t)dΩ^2 if g(r,t) =0, we have black hole? any metric that has... Jul28-13 12:42 PM GRGuy 2 319 hi I read this statement in site www.askamathematician.com and I couldn't understand it. is it possible to explain... Jul28-13 10:38 AM ghwellsjr 9 450 Several questions in a kind of stream of consciousness format... I was going over some special relativity notes and... Jul28-13 10:26 AM arkajad 4 445 hi i read this text(Theoretical Aspects of Massive Gravity BY Kurt Hinterbichler ) about massive gravity and now,... Jul28-13 07:16 AM sadegh4137 0 273 What is the central region of the so called black hole composed of? Are there intense energetic waves caused by... Jul27-13 03:26 PM WannabeNewton 26 1,364 Hey everyone, I've got a question. I've been doing a lot of reading about Quantum Field Theories lately, and watching... Jul27-13 02:04 PM Russell E 19 1,227 It's a pretty straight-forward question, and it got me confused since most articles on the internet mention planes of... Jul27-13 07:36 AM Nugatory 29 926 From here: http://www.reddit.com/r/askscience/comments/f1lgu/what_would_happen_if_the_event_horizons_of_two/ (About a... Jul27-13 07:29 AM mfb 1 289 Can one explain the relativistic energy transformation formula: E = \gamma\ E', where the primed frame has a... Jul27-13 01:44 AM PeterDonis 12 572 I learned about mach's principle from a book. But I can'understand the details of it. So can you please explain me... Jul26-13 03:03 AM WannabeNewton 1 348 So basically im in high school and have done my major exam for the end of the year. It was a good test except for one... Jul25-13 10:49 AM ghwellsjr 7 440

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