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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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Common Relativity questions, quality answers
Mar11-14 10:20 AM bcrowell 
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Jan16-12 Greg Bernhardt
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Feb23-13 08:40 AM
ZapperZ
1 40,457
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 40,116
So light can be bent by a gravitational field, and follows the curvature of spacetime. does light have a gravity field...
Jun13-14 05:04 PM
Drakkith
1 326
It is very important for me to know how scientists detect the speed of light in details...because there is something...
Jun13-14 03:50 PM
PeterDonis
27 898
So, this has really stirred my interest. To be clear, I'm not citing these as sources, simply linking for discussion;...
Jun12-14 07:37 PM
Simon Bridge
9 940
Hey guys, I was recently thinking about theoretical ways to accelerate objects (spacecraft) and I had the idea that...
Jun12-14 03:30 PM
DaleSpam
3 416
I know that you probably get tired of weird questions like this so I apologize in advance. I was thinking about...
Jun12-14 03:23 PM
pervect
12 467
Out of interest I'm studying a book "A first course in general relativity" which is a great book in my opinion because...
Jun12-14 10:28 AM
PeterDonis
8 448
I read recently that "...at present only GR theory predicts the required 13 parameters for agreement with critical...
Jun12-14 09:57 AM
WannabeNewton
1 246
So, if I travel in a ship at light speed in a line from earth to space for 10 minutes. Than turn around and travel...
Jun11-14 10:21 PM
PeterDonis
13 457
I've been reading Dr. Harold G. White's work on recent developments in Warp Field Mechanics, and thought up the...
Jun11-14 06:20 PM
PeterDonis
1 273
Hi, I'm trying to understand what the nature of gravity is. I know it is a force, and I know that heavy objects tend...
Jun11-14 05:32 PM
pervect
16 989
A interesting question came up to my mind, and it's related to the concept of different synchonization methods. If we...
Jun11-14 08:01 AM
WannabeNewton
15 585
It is often said that we basically live in the past, since it takes time for light to travel from objects to our eyes...
Jun10-14 12:40 PM
pervect
35 921
In, BBC - Wonders of Universe, Professor Brian Cox explains that universe is stretching and the space that we live in...
Jun10-14 05:36 AM
phinds
1 386
I have used GRTensorII and Cadabra for some time. And I think Cadabra have great potential for GR. But the current...
Jun10-14 04:24 AM
shadi_s10
16 1,447
If a planet is traveling through space and distorting space, why does it not slow down? If a boat travels through...
Jun9-14 10:07 PM
jobermark
4 462
Suppose that a wheel is rotating around its axis in free space with no friction, with no external forces acting on it....
Jun9-14 01:22 PM
WannabeNewton
8 705
Let us have an observer moving at some velocity v. And let our observer have 2 mirrors, one on either side of...
Jun8-14 06:04 PM
BiGyElLoWhAt
10 452
I am reading this paper http://arxiv.org/pdf/1111.4837.pdf and I came across under eq12 that the new metric is...
Jun7-14 06:01 PM
Bill_K
3 340
I've read a lot of places about length and time dialation or length contraction of an object relative to an observer,...
Jun7-14 06:51 AM
DaleSpam
54 1,617
The spin 4-vector is defined in the rest frame of the particle as s^{\mu}= (0, \vec{s}). Why is the zeroth...
Jun5-14 05:13 PM
WannabeNewton
3 355
Why is it that the covariant derivative of a covariant tensor does not seem to follow the product rule like...
Jun5-14 02:15 PM
stevendaryl
20 742
Assuming it were possible to build a sturdy enough rod like structure, say equal the length it would take light to...
Jun4-14 01:51 PM
PAllen
10 683
I have seen numerous articles referencing the teleportation of information over a distance of 3 meters using quantum...
Jun3-14 05:05 PM
mfb
5 403
What is the proof of Einsteins famous equation E = mc2 ?
Jun3-14 04:30 PM
PeterDonis
86 2,708
If light has a maximum speed of c, what frame of reference is that speed determined from? For example, if you were...
Jun3-14 10:55 AM
D H
7 491
I'm confused by something I read, that said: Ref: http://adsabs.harvard.edu/abs/1988AmJPh..56..811B What does...
Jun3-14 09:58 AM
randyu
5 350
Been reading laymen's books on general relativity and I'm in need some clarification! ... Line 1: The shortest path...
Jun2-14 08:35 PM
PeterDonis
6 359
I thought I understood how stellar aberration conformed to Special Relativity. The CHANGE in that angle comes from the...
Jun2-14 03:31 PM
micromass
102 3,431
So, I lay a rope into a black hole, rope leaves the reel at velocity 0.99 c. When I observe the lower end of the...
Jun2-14 02:37 PM
.Scott
9 597
Black hole A moves at slow velocity, and there's an Einstein light clock hovering near the event horizon. Black...
Jun2-14 01:26 PM
PeterDonis
7 363
I've been meaning to ask this for some time, and now I've plucked up the courage! It is puzzling to me that many...
Jun2-14 05:18 AM
WannabeNewton
1 287
I have a question. I am in a frame. I construct a spring scale and weigh a ball to be 200 lbs on the floor. I feel...
Jun1-14 06:04 PM
randyu
24 928
In an inertial reference frame - and zero gravity field - we believe that any passing photons go in Euclidean straight...
Jun1-14 12:10 PM
pervect
8 506
I am trying to understand this apparent "paradoxes" but probably i am missing something important. Imagine that...
Jun1-14 08:17 AM
ghwellsjr
1 373
Biking at near the speed of light If a biker is going at 0.99c, an observer standing still would notice his...
May31-14 11:29 PM
liometopum
44 1,703
Is there time inside of a black hole?
May31-14 07:59 PM
PeterDonis
33 1,346
Our latest understanding of gravity is based on Einstein's general theory of relativity which says gravity is geometry...
May31-14 04:46 PM
atyy
6 410
Hi. So the whole premise of special relativity seems to me to be hinged on the immutability of the speed of light,...
May30-14 07:49 PM
Simon Bridge
29 819
If yes, does dark energy define a frame of absolute rest? In the Einstein field equations, the cosmological...
May30-14 07:26 PM
PeterDonis
1 297
Einstein is quoted as saying "Time is an illusion" others have made utterances throughout the scientific and added...
May30-14 10:35 AM
jbriggs444
11 499

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