# 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: 5,775 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 42,799 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 42,438 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 0 317 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 15 875 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 1 343 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 2 402 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 3 640 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 9 439 I had a quick question about Time Dilation and Length Contraction. Are the two just different ways of... Feb9-14 01:41 PM phyti 14 571 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 1 360 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 3 380 I have a question regarding world lines and Minkowski diagrams. I have been looking everywhere for an answer and can't... Feb9-14 02:27 AM ghwellsjr 2 453 Thanks for the answers on my previous thread, it made some sense, and if I'll reply if there's further misconception.... Feb8-14 03:12 PM phyti 42 1,861 Hi, I'm just beginning to learn relativity, but I have a question about why gravity is so different from other... Feb7-14 08:08 PM WannabeNewton 4 553 hi everyone. i'm having trouble understanding the concept of proper time in general relativity. suppose we have... Feb7-14 06:04 PM pervect 31 1,083 I have a pretty basic question - one that should have occurred to me long ago, but I never really thought about... Feb7-14 03:12 PM A.T. 11 558 I'm not sure if this is the right forum. I'm sorry, but I'm not good at Physics or English (which is not my first... Feb7-14 01:02 PM waitedavid137 8 563 Hello! This is regarding problem 10.4 in Wald. Let ##(M,g_{ab})## be a space-time, ##\Sigma_{t}## be a one parameter... Feb7-14 09:25 AM WannabeNewton 7 923 We know the equations for speed of rotating magnetic field, as N= 120*f/P, where f is frequency of AC currents & P is... Feb7-14 07:16 AM Bill_K 1 471 The velocity of an object can, theoretically, only be measured relative to the velocity of another object. If I... Feb6-14 01:45 PM Glurth 9 437 In classical mechanics we talk about homogeneous and inhomogeneous gravitational fields. Do we do this with... Feb5-14 09:35 AM DaleSpam 1 257 There is a connection between the origin and the points in the light cone.That is to say,there is a casual... Feb5-14 12:17 AM bcrowell 13 772 In flat spacetime, there exists a natural connection that allows you to compare two vectors at different events. Now,... Feb4-14 05:33 PM dextercioby 23 1,047 EDIT dw i figured it out, not sure how to remove it though! Feb4-14 03:28 PM tommyj 4 542 Lets say I fall into a super-massive black hole's event horizon. Facing outwards towards the event horizon (with the... Feb4-14 12:03 AM Glurth 15 804 Hi, I'm doing the master in science and one of things that I have to study is the Gödel metric. His paper have a high... Feb3-14 08:56 PM George Jones 2 382 Imagine a 2.3 Ly long box. At the middle of the box there's a half silvered mirror (S) which splits laser beam into... Feb3-14 01:55 PM Vanadium 50 10 648 Hello all, After a brief break from attempting to learn tensor calculus, I'm once again back at it. Today, I... Feb3-14 12:46 PM Nugatory 12 878 For a long time I had basically taken for granted the usual interpretation of one-parameter families of orthogonal... Feb3-14 12:43 AM WannabeNewton 4 685 I am writing a paper about SR and GR. I have the following: Special relativity deals with inertial reference... Feb2-14 06:03 PM PAllen 27 1,716 As per Maxwell's equations the speed of light is c = 1/√(permeability X permittivity) I find that both... Feb2-14 04:51 PM pervect 12 634 https://www.youtube.com/watch?v=Cxqjyl74iu4 If the speed at which light waves propagate in vacuum is independent... Feb2-14 04:32 AM ghwellsjr 40 1,884 When I look at a minkowski diagram for a black hole I can see that time goes to infinity for the outside observer... Feb2-14 02:55 AM dyb 11 527 I have been learning that gravity has a negative energy associated with it. I've heard this stated a couple different... Feb2-14 01:19 AM pervect 13 789 Hi In the Schwarzchild metric, the proper time is given by c^{2}dτ^{2} = (1- \frac{2\Phi}{c^2})c^2 dt^2 - r^2 dθ^2... Feb1-14 09:42 PM waitedavid137 10 574 Pretty straight-forward, I'm just curious. My current level and understanding of physics has lead me to believe that... Feb1-14 05:21 PM Drakkith 9 824 Hi, could anyone help me out? The FLRW metric in spherical coordinates is: \;\; ds2 = dt2 - a(t)2(dr2 +... Feb1-14 04:53 PM Mordred 36 1,262 Hi, I noticed this topic already being discussed but didn't want to hijack the thread with a different question. I... Feb1-14 02:36 PM rede96 14 714 Well I am not sure if this thread belongs here or in mathematics/groups but since it also has to do with physics, I... Feb1-14 02:32 PM BruceW 4 381 Hi guys... I was wondering if anyone have a sort of a summary of sign conventions in general relativity books. By... Feb1-14 12:25 PM Nabigh R 7 543 As it's known, one of the most fundamental aspects of relativity is that all motion is relative. But when we apply... Feb1-14 10:47 AM ghwellsjr 52 3,595 Upon discovering the Starship Titanic while doing some research about time travel, I was wondering what joules would... Feb1-14 08:00 AM waitedavid137 7 505