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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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Feb23-13 08:40 AM
ZapperZ
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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
jtbell
0 37,124
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
PAllen
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
randombill
1 1,587
In order to explain the relativistic nature of magnetism, a book shows an example of linear procession of charges:...
Aug4-11 01:38 AM
cragar
1 1,216
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
DaleSpam
83 6,599
Can frame dragging around a black hole induce closed timelike curves (CTC)?
Aug3-11 07:56 PM
Chalnoth
9 1,732
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
pervect
2 934
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
tom.stoer
3 1,221
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
ccm.student
163 34,687
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
dextercioby
2 784
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
harrylin
94 9,013
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
11 1,348
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
DaveC426913
8 1,862
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
rationalist76
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
Bill_K
4 1,195
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
ghwellsjr
6 1,035
I was reading something about the Cartan (vierbein) formalism in GR, in wich the connection is allowed to have...
Aug2-11 09:03 AM
dextercioby
3 965
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
rationalist76
3 1,005
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
D H
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
time_nerd
104 8,077
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
ghwellsjr
16 1,784
Let us consider the cosmological metric: {ds}^{2}{=}{dt}^{2}{-}{}^{2}{} -------------- (1) For closed models k is...
Aug1-11 01:20 AM
Anamitra
1 516
In Newtonian physics, the center-of-mass of a group of particles depends on the instantaneous positions of the...
Jul31-11 02:47 PM
DrGreg
4 1,130
Relativistic momentum is a vector, just as non-relativistic momentum is a vector, right? Part of the relativistic...
Jul31-11 02:47 PM
jaketodd
7 3,882
V. A. Belinskii and V. E. Zakharov, Integration of the Einstein Equations by the Inverse Scattering Method and...
Jul31-11 02:30 PM
Bill_K
2 1,850
In classical mechanics, isn't kinetic energy not a Galilean scalar? So the action isn't invariant under Galilean...
Jul31-11 12:17 PM
Dickfore
13 1,823
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
3 3,273
Greetings I have been trying to find the orbit of Mercury using the geodesic equations with the Schwarzschild Metric,...
Jul31-11 03:10 AM
pervect
1 752
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
bcrowell
1 642
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
WannabeNewton
6 904
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
harrylin
17 2,412
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
Chestermiller
2 3,205
me: layman's understanding of physics and mathmatics My (very basic) understanding for this question is that: a...
Jul29-11 09:21 PM
Drakkith
5 867
If I move with constant acceleration, say accelerate my car, in mincowski spacetime (flat), will I feel a inertia...
Jul29-11 09:18 PM
pervect
10 1,224
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
TrickyDicky
14 1,660
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
nitsuj
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
ophiophagous
6 926
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
pervect
5 1,505
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
Janus
4 892
Read about this experiment and the results obtained: ...
Jul28-11 10:01 PM
OnlyMe
3 869
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
obnoxiousris
4 1,352

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