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Mar11-14 10:20 AM bcrowell 

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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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Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Feb23-13 08:40 AM
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The section of the Usenet Physics FAQ titled "Experimental Basis of Special Relativity" has been cited here many...
Dec31-07 02:06 AM
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moving Moving at c ( 1 2 3 ... Last)
I'm a relative newbie to relativity (no pun intended -- I know you've heard that one too many times), as well as to...
Aug4-11 10:18 AM
58 3,716
I'm trying to use the equations on this page and I have solved the following. Is it correct? ...
Aug4-11 03:54 AM
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In order to explain the relativistic nature of magnetism, a book shows an example of linear procession of charges:...
Aug4-11 01:38 AM
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On my blog, I am having a continuing discussion on special relativity with another person (we are both amatuers). We...
Aug3-11 09:38 PM
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Can frame dragging around a black hole induce closed timelike curves (CTC)?
Aug3-11 07:56 PM
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can twin paradox be solved,if no, what r the difficulties scientist face to solve it?? or is there a solution on it.
Aug3-11 01:17 PM
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Who’s “spin” is in the Einstein-Cartan theory? Source’s spin or the test particle’s spin? I quantum mechanics, when...
Aug3-11 12:21 PM
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I have been trying to figure this one out for some time now. I have read much on the subject, but it seems to be dealt...
Aug2-11 10:20 PM
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can you construct (or if yes, is it regularly done) a Hamiltonian in curved spacetime? If you took a system and moved...
Aug2-11 06:06 PM
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when we move with light our time is slower and when we move against it then it's slower but what if we move at 99%C in...
Aug2-11 04:11 PM
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If maths tells us 1 * -1 = -1 and it takes a positive cell to repel a positive cell ..... could in theory a...
Aug2-11 11:36 AM
Vanadium 50
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I do not understand if you accelerate a hydrogen atom to 90% the speed of light its mass is greatly increased. Are...
Aug2-11 11:03 AM
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I understand that matter and energy bend space time, yet i am curious as to the level at which it requires to bend it....
Aug2-11 10:57 AM
3 1,687
1) Is it always a given that the spacetime curvature will be flat in a region in which there is no mass? 2)...
Aug2-11 10:25 AM
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a situation of twin paradox one twin alice is moving with 99%C another john is at rest on earth this means 1...
Aug2-11 09:18 AM
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I was reading something about the Cartan (vierbein) formalism in GR, in wich the connection is allowed to have...
Aug2-11 09:03 AM
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If a bacteria was travelling through space at the speed of light would the cells divide at a constant or relative...
Aug1-11 11:20 PM
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how is twin paradox resolved in case of no/zero acceleration/deceleration? two twins one on earth and other on a...
Aug1-11 01:20 PM
131 10,046
There is no clock that will measure time independently of movement. And conversely, nothing ever happens that does not...
Aug1-11 10:52 AM
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I didn't know where to post this, but I figured since it has the word "relativity" in my question I would stick it...
Aug1-11 01:49 AM
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Let us consider the cosmological metric: {ds}^{2}{=}{dt}^{2}{-}{}^{2}{} -------------- (1) For closed models k is...
Aug1-11 01:20 AM
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In Newtonian physics, the center-of-mass of a group of particles depends on the instantaneous positions of the...
Jul31-11 02:47 PM
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Relativistic momentum is a vector, just as non-relativistic momentum is a vector, right? Part of the relativistic...
Jul31-11 02:47 PM
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V. A. Belinskii and V. E. Zakharov, Integration of the Einstein Equations by the Inverse Scattering Method and...
Jul31-11 02:30 PM
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In classical mechanics, isn't kinetic energy not a Galilean scalar? So the action isn't invariant under Galilean...
Jul31-11 12:17 PM
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two questions, If one was to create some sort of suspended gravity embraced in a cylinder, and then send oxygen and...
Jul31-11 10:02 AM
Vanadium 50
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Greetings I have been trying to find the orbit of Mercury using the geodesic equations with the Schwarzschild Metric,...
Jul31-11 03:10 AM
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When an em-wave red shifts due to leaving a gravitational field it loses energy, right? Where does that energy go,...
Jul30-11 10:15 PM
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Recently, when I was talking with my friends, one of them noted that as an object approaches c, there takes places an...
Jul30-11 04:14 PM
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hello One of the postulates in SR is that the speed of light in vacuum is constant for all observers. Is there a...
Jul30-11 12:18 PM
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if the magnitude of the four velocity vector is always c then it can be rewritten in polar form with 3 numbers giving...
Jul29-11 10:01 PM
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me: layman's understanding of physics and mathmatics My (very basic) understanding for this question is that: a...
Jul29-11 09:21 PM
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If I move with constant acceleration, say accelerate my car, in mincowski spacetime (flat), will I feel a inertia...
Jul29-11 09:18 PM
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The proper time elapsed between two points in a timelike geodesic in GR is the arc-length of this curve segment. Does...
Jul29-11 06:26 PM
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Recently I've watched a few videos and read over some explanations of time dilation and am quite confused by several...
Jul29-11 02:48 PM
9 2,123
I recently started self-learning special relativity. I am having lots of trouble convincing myself about the Lorentz...
Jul29-11 01:34 PM
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There's something bothering me about the event horizons of black holes. The Schwarzchild radius (as I see it) is...
Jul29-11 01:22 PM
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How I studied relativity, we postulated that a particle travelling at c in one inertial frame travels at c in all...
Jul29-11 11:34 AM
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Read about this experiment and the results obtained: ...
Jul28-11 10:01 PM
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sorry to bring this up again, i have just started special relativity and the constancy of c is a bit confusing, i get...
Jul28-11 08:43 PM
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