Sub-Forums : Special & General Relativity Search this Forum

### Relativity FAQ

Mar11-14 10:20 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
 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 37,383 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 37,141 If gravity waves are supposed to propagate at c, how could the theoretical warp drive wave propagate at greater than... Sep15-13 06:51 AM Vanadium 50 4 489 A typical formulation of the Einstein equations is R_{\mu\nu}-\frac{1}{2}Rg_{\mu\nu}+\Lambda g_{\mu\nu}=\frac{8\pi... Sep15-13 12:15 AM WannabeNewton 1 558 Given g=\det(g_{\mu\nu}), I find that \frac{\partial g}{\partial g^{\mu\nu}}=-gg_{\mu\nu} Can someone confirm... Sep14-13 03:46 PM Bill_K 1 443 As I see,I will show you something and I want to explain me who has right. For example into the run a human walk... Sep14-13 09:30 AM ZapperZ 22 1,205 http://en.wikipedia.org/wiki/Twin_paradox I read a little bit about this, and am a little bit confused. I always... Sep14-13 06:57 AM DaleSpam 4 550 Someone published a simple computation of the relativistic shift in Mercury's perihelion (over and above classical,... Sep13-13 08:55 PM atyy 1 443 A long time ago I visualized mass accelerated to the speed of light(or theoretical maximum to this speed) as an... Sep13-13 03:33 PM bizzder 6 428 The CMB used to be gamma rays, right? And now it's microwaves - more redder energy: so where did the rest of the... Sep13-13 08:06 AM Naty1 18 1,350 The contra-variant transform seems to be defined by the differential transform from calculus. ... Sep13-13 07:34 AM HallsofIvy 1 453 If light takes 1 year to reach a destination, and it takes a ship 2 years to reach the same destination, how fast is... Sep12-13 01:46 PM ghwellsjr 8 852 Can anyone help me with this thought experiment. I have a spaceship moving at very close to the speed of light.... Sep12-13 10:36 AM ghwellsjr 13 618 General Relativity says that every object that has mass make a curvation to space-time. Ι want to ask from what... Sep12-13 06:47 AM DaleSpam 1 435 My first of many GR questions :cool:: If electromagnetism can be incorporated into the standard model, where I... Sep11-13 07:10 PM atyy 7 519 Hi, I am having problems in constructing a stress-energy tensor representing a constant magnetic field Bz in the... Sep11-13 04:38 PM PeterDonis 12 655 I have a question, my bestfriends dad said that if we were driving at 70 mph and then honked the horn, the sound would... Sep11-13 01:29 PM Nugatory 3 601 explain it like im 12 years old. Sep10-13 10:34 AM jtbell 6 614 I read an article a while back, I can't seem to find it now, that stated that photons can deteriorate into smaller... Sep10-13 09:00 AM Naty1 13 893 I know this is a really "dumb" question but I was thinking about the time continuem that moves from left to right... Sep9-13 02:37 PM PeterDonis 11 801 It has been said that special relativity calls for light's one-way speed to be exactly c per all inertial coordinate... Sep8-13 09:11 PM DaleSpam 49 2,716 Hi, Consider two fixed points A and B in a frame S. In this frame a person P moves towards the point A and does an... Sep8-13 02:38 PM PAllen 8 568 Hi, Consider an observer S pushing a fork towards a material x-axis as seen in the figure below According to... Sep8-13 01:13 PM bgq 20 1,180 There is a static spherically symmetric perfect fluid solution of the EFE where the energy-momentum tensor is... Sep8-13 04:22 AM Mentz114 2 490 Hi, I'm new and uneducated. Would like to know how to reconcile space-time being considered asymptotically flat near... Sep7-13 10:43 PM jbunch 14 589 In a different thread the Herglotz Noether theorem was brought up and it was mentioned that this theory implies it is... Sep7-13 08:01 PM yuiop 80 3,549 Hi guys! I need help on a problem from one of my GR texts. Suppose that ##\xi^a## is a killing vector field and... Sep7-13 03:35 PM WannabeNewton 4 755 The general field equation for GR is Rab - 1/2 gab R = 8πTab where I am setting G = 1 and c = 1. Also, the... Sep7-13 01:25 PM Thinkor 3 495 Hi! I am having the following action with an induced metric and a scalar field: S = \int dr d^dx \, \left(... Sep7-13 09:44 AM llorgos 0 355 Galilean principle of relativity is for sure not absolutely true, isn't it? Say one has a pool full of water within... Sep7-13 06:37 AM DaleSpam 44 1,659 If you had two synchronized clocks in two side by side elevators, and one sat on the surface of the earth in 1 g for... Sep6-13 02:49 PM Nugatory 14 764 Hi.. I was reading about the special theory of relativity, and was thinking about interactions and speed of source... Sep6-13 02:16 PM harrylin 9 639 Hello PF members! First of all, let me start off my post by admitting that I have created a duplicate account.... Sep5-13 10:34 AM berkeman 3 668 The presence of a cosmic string does not lead to gravitational attraction of a particle placed some distance away from... Sep5-13 08:49 AM Bill_K 1 470 I'll begin by admitting that I did not scroll through the entire list of threads to see if there was already a post... Sep5-13 02:27 AM RiccardoVen 15 935 Ideal rulers in relativity are generally assumed to be consistent with radar measurements. The modern definition of... Sep5-13 01:27 AM pervect 8 545 In the equation x = vt it is generally accepted that x and v are vectors and that they have a common eigenvector.... Sep4-13 06:37 PM WannabeNewton 21 1,328 I have a (probably trivial) question about coordinate charts. I've been studying Sean Carroll's lecture notes on... Sep4-13 05:25 PM Ibix 2 454 Can anyone explain about time dilation in a simple way? I am confused about these facts: 1) If an observer A... Sep4-13 04:40 PM Nugatory 9 570 Can anyone give me a geometrical interpretation of the weyl curvature tensor? Sep4-13 11:44 AM WannabeNewton 7 520 I have two questions having to do with the Lorentz transformation for the time...some preamble first: The Lorentz... Sep4-13 08:41 AM ghwellsjr 2 508 Gravity is zero at the center of the earth. how come the same set of equations predict the gravity to be infinity at... Sep4-13 03:48 AM Sasikanth9 1 412