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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...
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Observers Alice and Bob are hovering far above the event horizon of a block hole. Alice stops hovering and enters...
Jan27-14 09:56 AM
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Ive Heard that things can get mass when moving in speeds Close to c. So I have question. Lets say we have to...
Jan27-14 09:38 AM
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An intuitive gravity analogy that explains why the moon orbits the earth is, the earth's mass' effect on space creates...
Jan27-14 05:09 AM
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Hi, i'm new to this, so i'm hope this is how this works. But I had a question. I've heard that even theoretically,...
Jan26-14 11:09 PM
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I have heard many physicists (ex:- Michio Kaku) saying "Warp speed" from Star Trek doesn't violate any known physical...
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I had a discussion regarding the region of spacetime visible to an observer falling into aSchwarzschild black hole....
Jan26-14 03:30 PM
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If the tangent space at p is a true vector space, then it must be that the sum of two vectors is itself a directional...
Jan26-14 01:45 PM
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Hi all. I'm a run-of-the-mill layman—not a student. I've just developed an interest in physics lately and have been...
Jan26-14 10:33 AM
Incognito310
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So I just started taking Modern Physics and we are currently discussing special relativity. And needless to say, its...
Jan26-14 09:28 AM
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Is there a simple intuitive description of what the Ricci tensor and scalar represent? I have what seems to me a...
Jan26-14 06:13 AM
pervect
2 257
Hey everyone, for anyone who saw my thread in the chemistry section you know I'm changing my view point to that of the...
Jan26-14 05:45 AM
llynne
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Hello, Lately I have been wondering about the implications of the speed of light being constant for all observers,...
Jan26-14 02:19 AM
ghwellsjr
12 420
Hello, I was reading a book about general relativity and I came across these two equations $$ \begin{align} ...
Jan25-14 04:37 PM
direct99
5 325
According to general relativity, if a remote observer monitors an object falling onto a black hole, (s)he will never...
Jan25-14 03:12 PM
phinds
6 326
Hi. I know that space for an object in motion will contract, relative to an observer. We generally read that space...
Jan25-14 02:29 PM
Mentz114
62 1,270
How do you find the inverse of metric tensor when there are off-diagonals? More specifivally, given the (Kerr)...
Jan25-14 10:48 AM
Nabigh R
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With Δt = γ ( Δt' + v Δx' ) For calculating delta t for stationary twin with values of traveling twin. Is it...
Jan25-14 12:35 AM
morrobay
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Tensors can be of type (n, m), denoting n covariant and m contravariant indicies. Rank is a concept that comes from...
Jan24-14 09:50 PM
jcsd
4 236
Hi, I'm trying to understand why the metric I've seen for AdS space,...
Jan24-14 11:38 AM
copernicus1
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From what I learned watching Brian Greene's "Fabric of the Cosmos" episode on Nova, if you look at spacetime like a...
Jan23-14 08:56 PM
PeterDonis
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This is about Hans Ohanian, "Einstein's E = mc2 mistakes," http://arxiv.org/abs/0805.1400 , a historical paper that...
Jan23-14 06:03 PM
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I'm concerned about your book. I got up to this part: And I got very concerned. Although what you say is true,...
Jan23-14 03:40 PM
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If space-like Killing vectors are associated with a conserved momentum, and timelike Killing vectors are associated...
Jan23-14 03:26 AM
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3 288
Hello all, I will preface this post with an apology for not putting it in the math/science learning materials...
Jan22-14 06:58 PM
bcrowell
6 303
There's an equation from Dirac's book on General Relativity that I don't get at all. It isn't derived; instead it's...
Jan22-14 06:03 PM
Bill_K
3 257
I've been working on a problem that I can't seem to get started on. Here is how it is posted: Metric of a space is:...
Jan22-14 03:47 PM
Libra82
13 388
Disclaimer: I have no formal education in physics. I watched a TedTalk...
Jan22-14 02:58 PM
mfb
1 222
A quick question I hope: What would I see from Earth if I sent a rocket to Saturn at nearly the speed of light? ...
Jan22-14 02:42 PM
DaleSpam
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What happens to a particle in a scalar potential U(t,x)? I have been living under a belief that the equation of motion...
Jan22-14 01:40 PM
jostpuur
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We are trying to find the relative velocity in a Lemaitre observer's frame, when said observer passes an observer...
Jan22-14 05:06 AM
Mentz114
15 436
After learning about special relativity, and the behavior of light, I do not understand why light is not able to reach...
Jan21-14 05:36 PM
stevmg
41 1,385
The full Lagrangian for electrodynamics ##\mathcal{L}## can be expressed as ##\mathcal{L}=\mathcal{L}_\textrm{field}+...
Jan21-14 09:21 AM
dextercioby
2 306
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Jan20-14 09:35 PM
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In the wikipedia page a distinction is made in the definition of the SR 4-acceleration between the case with...
Jan20-14 03:32 PM
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4 320
I remember reading something, long ago, to the effect that any attempt at creating a CTC would be doomed by energy...
Jan20-14 01:30 PM
PAllen
4 313
If you don't have any charges or currents, the electromagnetic Lagrangian becomes...
Jan20-14 12:33 PM
BruceW
14 447
The Lagrangian for a point particle is just L=-m\sqrt{1-v^2}. If instead we had a continuous distribution of matter,...
Jan20-14 11:16 AM
dextercioby
10 422
I am just wondering - is space-time curvature in the presence of energy-momentum ( i.e. in interior solutions to the...
Jan20-14 08:26 AM
Markus Hanke
4 256
Two twins A and (evil) B. Twin A remains "stationary" while evil B goes at near light speed to-and-fro. Ignoring...
Jan20-14 02:36 AM
tom.stoer
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Is there any reason to think that that the speed of light could vary with time (taking t=0 at Big Bang), ie, could...
Jan19-14 03:27 PM
stevmg
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