# Sub-Forums : Special & General Relativity

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### Relativity FAQ

Sep10-12 10:09 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
 Views: 8,461 Announcement: Two free ways to get Gold Membership! Jan17-12 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 36,648 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 36,506 I've been watching the Stanford lectures on GR by Leonard Susskind and according to him the metric tensor is not... Feb19-14 02:08 PM Chestermiller 9 426 Redshifting Through Hole in Earth ( 1 2 3 ... Last) I have been wondering what to expect if there was a hole, from pole to pole, that inside which we could measure the... Feb19-14 12:16 PM PeterDonis 88 2,051 When I studied special relativity for the first time, I encountered the exemple of a infinite neutral wire in the... Feb18-14 09:18 PM jartsa 8 549 On page 161 of Carroll's Spacetime and Geometry, Carroll writes that \delta... Feb18-14 03:32 PM Bill_K 9 311 We all know that the energy-momentum tensor for dust is just ##T^{\alpha\beta}=\rho_0 v^\alpha v^\beta##, where... Feb18-14 02:57 PM dEdt 0 228 I am currently taking an undergraduate modern physics course that offers a brief overview of relativity. Let us... Feb18-14 07:49 AM Chestermiller 12 493 It is said that Relativity proves that if one travels near the speed of light that time slows down, i.e. that the twin... Feb18-14 05:38 AM DaleSpam 2 297 Let's say there's a wormhole entrance on the floor of my room, and the exit would be on the ceiling. If I drop a ball... Feb17-14 11:17 PM HarryRool 9 402 If light approaches a black hole will it accelerate? I think this question ties in with whether light has mass or not.... Feb17-14 10:30 PM A.T. 10 425 Hello, It is my understanding that in the case of two observers (A and B) passing each other at high speeds that due... Feb17-14 03:11 AM Nugatory 1 258 I'm trying to understand the special theory of relativity. All answers I've found to the problem below seem to provide... Feb17-14 02:45 AM BruceW 21 645 Would someone be kind enough to tell me if I'm getting this correct. http://s30.postimg.org/hql7gx8ox/Prob_4.gif ... Feb16-14 02:41 PM PeterDonis 5 309 I'm trying to find examples of stress-energy tensors from exact solutions of the EFE corresponding physically to... Feb16-14 06:30 AM TrickyDicky 36 950 Why do we always need to define simultaneity in relativity. The moving train with a light signal at the mid point... Feb16-14 04:15 AM bahamagreen 6 429 The "s" in the geodesic equation refers to the "surface area" for that portion of the orbit around a star or black... Feb15-14 07:53 PM DaleSpam 3 292 In classical mechanics you want to calculate the moment of inertia for hollow & solid: lines, triangles,... Feb14-14 06:04 PM WannabeNewton 5 386 Hello fellow PF go-ers I am having trouble with coordinates in curved space time lately, allow me to demonstrate my... Feb14-14 12:55 PM DaleSpam 5 328 I am starting to learn Special and General realitivity by reading through Bernard F. Schutz's book "A First Course in... Feb13-14 05:40 PM pervect 9 414 After a recent conversation, I was trying to determine if there is an online authoritative definition for the age of... Feb13-14 05:06 PM TrickyDicky 13 444 It is said that the light we see from a star a million light years away is actually what happened a million years ago,... Feb13-14 10:55 AM phinds 6 1,023 I didn't want to derail the last thread on the sliding block, but I think I noticed something interesting. If we... Feb13-14 02:41 AM pervect 13 525 If we use the "flux of 4-momentum" definition of the stress-energy tensor, it's not clear to me why it should be... Feb12-14 07:16 PM bcrowell 5 335 Consider the thought experiment in the diagram below. ... Feb12-14 05:27 PM WannabeNewton 12 625 Have been reading the "Impossibility of exceeding c" notes in the Lorentz Transformation physics forum page: ... Feb12-14 10:14 AM DaleSpam 6 409 I want to study GR from a mathematical point of view but I know almost no physics. Is this possible? And what textbook... Feb11-14 11:56 PM bcrowell 6 423 Hi guys, this is my first post, I'm a newbie regarding physics and relativity so I hope you can help me here. I've... Feb11-14 12:44 PM PhoebeLasa 8 417 Does anyone here know a source, where the equation of motion for a massless charged particle (which of course does not... Feb11-14 10:28 AM bcrowell 20 705 Hello! I am interested in knowing the existing relation between the ADM Formalism and the Wheeler-deWitt Equation. ... Feb11-14 10:16 AM jesusrods 0 202 Hello! I am currently learning the theory of relativity, but have a hard time understanding the time dilation... Feb11-14 10:15 AM Nugatory 17 916 Hi, I’m a bit confused. I am familiar with the chain rule: if y=f(g(t,x),h(t,x)) then dy/dt=dy/dg*dg/dt+dy/dh*dh/dt... Feb11-14 08:47 AM Chestermiller 4 401 Hello, I am learning General Relativity through some books like 'Gravity' by Hartle and through some other text... Feb10-14 04:58 PM Daverz 6 357 Hiya, I am a grad student who has had a couple semesters of GR. I am currently perusing a book about Two Spinors in... Feb10-14 02:34 PM dozappp 0 208 I thought that one of the features of GRT was to allow for ACCELERATING reference frames. Yet none of my textbooks... Feb10-14 11:38 AM DaleSpam 15 700 There are only two frame moving relative with each other at certain velocity. One frame see the other going right and... Feb10-14 09:22 AM Nugatory 1 277 The popular thought experiment states, that if of two identical twins one is left on earth an the other is embarked on... Feb10-14 09:14 AM scienalc 2 319 Hi, I decided to learn about relativity with this book, and I'm looking for people who would like to read it with... Feb9-14 05:19 PM strangerep 3 437 page 71 he appears to define the affine connection in terms of derivatives on the locally inertial coordinates with... Feb9-14 04:39 PM thoughtgaze 9 322 I had a quick question about Time Dilation and Length Contraction. Are the two just different ways of... Feb9-14 01:41 PM phyti 14 428 From what I understand, Hawking radiation results when one virtual particle (of the pair) falls into the black hole... Feb9-14 12:17 PM PeterDonis 1 270 I am trying to derive the geodesic equation by extremising the integral $$\ell = \int d\tau$$ Now after applying... Feb9-14 11:47 AM Nabigh R 3 292