# 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: 120,360 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 41,596 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 41,247 I have read a number of threads on acceleration and special relativity, but can't find what I'm looking for. I would... Feb23-08 02:58 PM DaleSpam 10 2,089 I have just read the "Read Before Posting" sticky thread and am wondering. Relativity is a difficult theory to... Feb22-08 12:54 AM chroot 46 3,907 Is there an invariance relation for angular momentum similar to E^2 = p^2 + m^2 ? How about quantum spin ? Feb21-08 03:15 PM pam 1 1,227 Been reading about aberration and two explanations that diverge - classical and relativistic. at speeds much slower... Feb21-08 03:05 PM yuiop 5 2,984 there are a few things i don't get when it comes to light moving at c from all frames of reference... i mean it makes... Feb21-08 10:37 AM Janus 9 2,122 You have charged dust (pressure = 0, charge density/mass density = given constant). I suppose the total... Feb21-08 08:10 AM Ich 1 2,123 Is there any consensus among experimental and/or theoretical physicists about Tom Van Flandern's ideas about gravity... Feb21-08 06:46 AM gonegahgah 53 9,543 In other threads the topic of how the proper time of a clock under acceleration has come up a number of times so I... Feb21-08 01:49 AM 1effect 18 4,317 Hi, as a highschool teacher I am stuck with the following student's question on time dilatation (SR) which could be... Feb20-08 05:14 AM yuiop 19 3,746 Just a thought; if indeed electrons transit around the nucleus, shouldn't we see relativistic doppler shifting as... Feb19-08 02:02 PM ZapperZ 14 3,129 tattman posted this in a thread and i was curious to know an explanation so i decided to post it in a new thread ... Feb19-08 01:46 PM uprootedferre 2 1,117 I have been trying to show that the Einstein ring radius R_e = 2^1/2 to no avail. can someone who knows this show me,... Feb19-08 06:39 AM George Jones 1 4,544 Given we have a spherically symmetric gravitational field around a spherically symmetric body of mass M. How can I... Feb18-08 10:35 AM TheMan112 4 3,587 First of all, velocity is a relative phenomenon. When we say velocity of an object is s m/s, it is relative to some... Feb17-08 07:11 PM nanobug 6 1,844 How do I rewrite Einsteins famous field equation R_{ab} - \frac{1}{2} g_{ab} R = \frac{8 \pi G}{c^4} T_{ab} ... Feb17-08 05:39 PM TheMan112 11 2,808 If T_{ab} = \rho u_a u_b is the stress tensor for dust. How can I show that T^{ab}_{;b} = 0 mean that dustparticles... Feb17-08 05:28 PM TheMan112 0 989 I am reading Taylor and Wheeler's Spacetime Physics. I am enjoying it a lot and find it extremely readable but I have... Feb17-08 05:01 PM Ed Quanta 0 1,264 Hey folks, Does anyone know how to get the line element on a torus? The ds^2 term. I want to find the metric... Feb17-08 04:38 PM robousy 2 2,600 Hello everybody, this is my first post here. I need help with a task in General Relativity. ------- Given we... Feb17-08 10:19 AM CompuChip 10 3,037 The idea is that you have a clock at the origin of some frame O. In order to synchronize this clock with 2 other... Feb17-08 06:28 AM Doc Al 7 2,270 Good day to you all, I am total amateur so people with high physics degree dont need to waste their time since this... Feb16-08 04:02 PM Tachyonie 2 1,406 I was thinking about how one would teach special relativity using a spacetime-geometric approach. I think you would... Feb16-08 09:12 AM Fredrik 16 4,311 Faster than light. ( 1 2 3 ... Last) Well, it's an interesting thought, but one that I can't quite believe, or maybe more I can't understand how, something... Feb15-08 08:44 PM RetardedBastard 65 7,574 Re-reading "On the Electrodynamics of Moving Bodies" by A. Einstein from 1905 (English translation I found on the... Feb15-08 06:23 PM W.RonG 6 1,757 As we know, Bondi derives the Lorentz transformations (LT) via the radar detection of the space-time coordinates of a... Feb15-08 03:31 PM bernhard.rothenstein 7 1,975 i've never been good at putting my thoughts into words...so i was hoping someone could pickup on my theory, maybe even... Feb15-08 11:43 AM HallsofIvy 1 1,463 When searching for KK stuff in forums, I see that when g(5) is applied to L(5 R), this effectively splits the equation... Feb15-08 10:51 AM MikeL# 13 3,540 Hi im new to understanding the theory of relativity so please excuse me. I can make sense of most of it. The one thing... Feb14-08 07:55 PM CaptainQuasar 8 1,644 Imagine a solid chain from the Earth to the moon's surface (which I believe is 1.5 light seconds away). Now Imagine... Feb14-08 04:00 PM russ_watters 4 1,315 Does anyone know of any good tutorials for grtensor (for maple) other than the documentation that comes with the... Feb14-08 12:14 PM Pacopag 0 4,447 How do you argue that the equation for time dilation derived from studying a light clock can be used in general. For... Feb14-08 11:32 AM country boy 3 2,720 Could someone pleases either: a. Justify the notion that the Lorentz interval between two events is independent of... Feb14-08 06:58 AM DrGreg 15 3,526 Hello all. I asked this question as a sub-question in another thread where it was perhaps inappropriate. It is very... Feb13-08 11:12 PM JesseM 9 1,673 This thread is another extending from the Schwarzschild Metric and Climbing out of a Black Hole. I hope the... Feb13-08 10:34 PM yogi 6 2,027 I ahve always wondered why only the curvature term R_{\mu,\nu} been considered in GR. From differential Geoetry, how... Feb13-08 04:47 PM geoffc 2 2,116 Tachyons travel backward in time? ( 1 2 3 ... Last) The time dilation equation: \Delta t' = \Delta t/\sqrt{1 - v^2/c^2} Now lets consider a tachyon with v = 2c ... Feb13-08 04:20 PM DaleSpam 71 27,461 Hi everyone; I'm new to both PF and GR, so please bear with me if I'm not being very clear, or using standard syntax... Feb13-08 10:05 AM haushofer 3 2,531 Forgive me if this has been posted before, but looking through a page of search entries I found many topics that were... Feb12-08 04:44 PM yuiop 19 2,775 If we impose that under no force or gravitational field Lorentz transform must hold, my question is if the validity of... Feb12-08 01:04 PM yuiop 2 1,811 Let’s put an observer in a 3-D frame of reference at x=0, y=0, z=0 to observe one of Einstein’s thought-experiments. ... Feb12-08 06:24 AM JesseM 3 1,503