# 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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### Relativity FAQ

Common Relativity questions, quality answers
Mar11-14 10:20 AM bcrowell
 Meta Thread / Thread Starter Last Post Replies Views Views: 81,221 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 40,732 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 40,379 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 1,254 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 2,584 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 3,032 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 2,238 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 1,400 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 4,294 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 7,566 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 1,751 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 1,973 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 1,455 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 3,532 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 1,640 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 1,314 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 4,239 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 2,639 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 3,512 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 2,011 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 2,112 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 27,406 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 2,526 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 2,771 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 1,807 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 1,483 Hi, I am new to this forum so I apologise if a similar thread already exists. I am trying to resolve the... Feb12-08 06:19 AM Ich 10 4,169 Proof that pressure is invariant on the front and back faces of the moving box. (We are already agreed in another... Feb11-08 11:40 PM yuiop 44 5,794 why no one use the Special or General Relativity in QM (Quantum mechanics) ... when QM studies particles that move... Feb11-08 11:31 AM Tom Mattson 8 1,900 If it has been determined that time/space is always relative to gravity as observed in several equations (correct me... Feb11-08 10:03 AM masudr 11 3,612 Suppose 2 particles are heading towards each other at a speed very close to the speed of light (relative to a... Feb11-08 05:15 AM itsjustme 4 1,525 Now, It is has been derived from GR that the pressure within a substance contributes to it's gravity just as it's mass... Feb10-08 07:17 PM pervect 16 3,535 why haven't there been any observations of planets or stars or anything near a black hole's event horizon being... Feb10-08 03:25 PM mathman 3 1,426 By way of explanation, I am on a learning curve as far as relativity is concerned, but then this might be true for... Feb10-08 11:12 AM pervect 4 1,606 How do you get gravitational waves or gravitons out of the EFE? It certainly doesn't look like a wave equation. Are... Feb9-08 02:16 PM joelperr 2 1,123 Nothing can be said about an objects speed in space unless it is compared to the motion of another object. 1. Can... Feb8-08 10:30 PM JesseM 15 3,285 It occurred to me that, as far as calculating the position or movement of objects a reference frame can be rotational,... Feb8-08 03:45 PM CaptainQuasar 3 1,675 S = a stationary one-dimensional coordinate system. The x'-axis of another one-dimensional coordinate system S'... Feb8-08 12:17 PM arbol 6 1,866 Why did Einstein chose R_ab - 1/2 g_ab R = k T_ab the Right side is basically saying the mass/energy causes the... Feb7-08 09:03 PM Phymath 2 1,834 Since everything in the universe is moving relative to the other, how can one measure an absolute velocity? Therefore,... Feb7-08 08:07 PM pervect 14 2,054 Can anyone explain to me how to expand this expression for curl which I find in the GR book I'm reading (by Hobson,... Feb7-08 04:40 PM Mentz114 12 2,497

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