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### Relativity FAQ

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
 Views: 415 Announcement: End of year contest, $75+$50 prize! Dec18-13 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 35,267 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 35,112 Have I got it right this time? Red-shifting is determined by the difference between the space-time curvature at the... Sep11-04 03:46 AM pervect 2 1,428 Hi all, I have recently been listening to one of Professor Richard Wolfson's physics lectures, and a question has... Apr3-08 07:59 PM tiny-tim 10 1,428 According to Wikipedia, the equation for the Kerr metric is: c^{2} d\tau^{2} = \left( 1 - \frac{r_{s} r}{\rho^{2}}... Aug8-08 10:32 PM K.J.Healey 2 1,428 HI, I've been mulling over the derivation of the Lorentz factor gamma in my head for some time now & had worried about... Jan11-10 11:40 AM yuiop 7 1,428 Hello, Surfing the web I came across a question posted by someone. Basically the question asked if I were to have a... Dec9-11 06:23 PM Passionflower 15 1,428 Just a quick question on spacetime intervals in spacetime. Why is the spacetime interval between two events given by... Jan25-12 09:26 PM bobc2 3 1,428 Hulse and Taylor's observation of PSR B1913+16 provides indirect evidence for the existence of gravitational waves... May5-12 03:55 AM GeorgeDishman 14 1,428 A gravitational field condenses space while slowing time. If we look at space and time as comprised of finitely-sized... Jan25-04 10:41 AM speso72 11 1,427 Relativity has been so hard for me to understand! One minute, it makes sense, and the next I am lost. I kind of... Mar7-04 11:37 PM yogi 5 1,427 Right please bear with me on this, as I have only had 8th grade science for this =]. Right so I understand that no... Oct19-07 08:11 AM Alex48674 5 1,427 During acceleration, will the train's rear clock appear to tick faster than the train's front clock from... Nov13-06 09:49 AM Demystifier 6 1,427 Today my friend told me a strange theory:when the angular kinetic energy of something is large enough,some of the... Oct24-07 04:53 PM pervect 9 1,427 In CM there is this equation of motion for ciruclar orbits: F=k/r^2=m*v^2/r, where k depends on the force involved. ... Jan26-11 08:33 AM upurg 10 1,427 Can someone help me with this, How fast, or should I say near the speed of light would someone have to be to see... Aug2-04 03:59 PM chroot 17 1,426 Hi pervect I was going to put this material in the thread where we discussed this topic but I'm unable to locate... Jun24-07 10:14 PM pmb_phy 6 1,426 I have a very important qs to ask on relativity. Picture this: 2 person "A" and "B" : A is stationary and B is... Sep9-08 02:39 AM JesseM 1 1,426 In SPH 4U1, (Ontario Grade 12 Physics) we learn the attempts to stop the affects that the human body experiences when... Dec31-08 02:12 PM Jonathan Scott 5 1,426 Is it possible to do general relativity but avoid the difficult mathematics of generalized coordinates, tensors, and... Nov5-09 06:39 AM pervect 2 1,426 Hi, I asked a theoretical question here a month or two ago and someone was able to help me. I have another: Imagine... Jan24-11 08:53 AM bobc2 14 1,426 HI all There is smth I dont understand in building initial data for BH The equations everybody uses uses spacetime... Dec5-11 09:53 AM PeterDonis 11 1,426 Certainly an easy question for you (specialists on this forum) but absolutely not clear for me. The ADM Approach (1... May20-05 10:40 AM Blackforest 12 1,425 Ok I was trying to explain special relativity to a friend and I was wondering about something (he said someone... Aug2-05 05:55 PM jtbell 10 1,425 Hi guys. I'm pretty new to this forum and wanted to talk about something I have been thinking about for a long time. ... May1-06 09:49 PM pervect 4 1,425 What are the appropriate units for the left half of the GR equation? Meters? square meters..? To put it another way,... Mar14-08 05:52 AM Ich 6 1,425 Is it possible to explain, in one or two paragraphs, what the scalar curvature, R, is as it applies to General... Jan30-11 12:06 PM bcrowell 6 1,425 What causes people to age differently? Here is a simple example: A man moves inertially between two clocks in... Nov1-13 04:05 PM ZapperZ 36 1,425 First please bare with me, I'm not close to being a physicist. So if I combine E=m*c^2 and that mass creates... Nov27-08 10:24 AM elfdud7 10 1,424 I have a question about the Twin Paradox. I don't know if I'm right or wrong, but thats why I figured I would come... Sep5-08 10:04 AM atyy 2 1,424 The newtonian limit for general relativity exists only for the asymptotically flat spacetimes. FRW case definitely... Sep20-08 04:56 AM astromandi 10 1,424 Given present theory, how would a laser photon stream behave at a tangent point to an event horizon (EH)? Is it... Jun27-09 02:49 PM Jonathan Scott 5 1,424 I have been reading discussions where the Rindler horizon is compared to the event horizon of a black hole. In the... Aug25-10 08:08 AM Austin0 0 1,424 In simple terms could someone please explain to me the reason why space contracts when approaching the speed of light? Dec27-12 05:56 PM DaleSpam 17 1,424 I'm in a rocket ship hovering at a non-black-hole Schwarzschild radius. The bottom half of my ship is inside the... Aug20-04 12:48 PM LURCH 6 1,423 I heard that some kind of experiment on frame-dragging was in process (or is that finished?). What was the outcome?... Aug1-06 03:31 PM pervect 7 1,423 I watched an interesting programme a while ago about the atom, and amongst other things relativity was quite prominent... Jul27-08 03:00 PM f95toli 1 1,423 Schwarzschild example: Two observers orbit around the same central point mass at different radii. They measure that... Jun7-09 12:14 PM nutgeb 1 1,423 To make a long story short I'm suppose to be learning how to "obtain non-zero curvature components of Schwarzschild... Aug27-09 06:45 PM 23571113 14 1,423 My understanding of relativity is that if two masses are in constant motion relative to each other, either one of them... Feb6-12 09:12 AM DaleSpam 7 1,423 Planck energy: E_P = m_P c^2 = \sqrt{\frac{\hbar c^5}{G}} Gravitational radius: r_G = \frac{r_s}{2} = \frac{G... Dec30-09 06:42 PM Orion1 2 1,422 Does anyone have an English translation of Einstein's 1906 paper "The Principle of Conservation of Motion of the... Jun16-12 09:24 AM TSny 6 1,422