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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
Jul24-14 09:06 AM Greg Bernhardt 
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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 42,794
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 42,431
If the effects of gravity are relative to an objects stress-energy-momentum tensor, is the equation: Fg = Gm1m2/r^2...
Jan31-14 12:00 AM
Nugatory
3 534
Hey guys, I just want to ask a quick question that confuses me a bit regarding the twin paradox. During acceleration,...
Jan30-14 04:27 PM
pervect
32 1,131
Hello All, would anyone know an expression for the heat capacity of an ideal gas, moving with relativistic speeds....
Jan30-14 10:30 AM
Sunfire
10 463
I have a question; If two particles (let's say protons) collide at high speed, they can produce heavy particles, like...
Jan29-14 08:10 PM
Herbascious J
7 567
...is the impression that "God plays dice with the universe" an illusion? If all time in the universe is already...
Jan29-14 05:29 PM
ZapperZ
12 929
I remember I have read somewhere that contravariant/covariant vectors correspond to polar/axial vectors in physics,...
Jan29-14 02:38 PM
WannabeNewton
7 812
In http://arxiv.org/abs/0808.1081 / Am.J.Phys.77:688-694,2009 Bunn and Hogg explain how cosmological redshift can be...
Jan29-14 08:33 AM
PAllen
13 1,110
We know the equation E=mc^2 which correlates energy to mass. If we rearrange the equation: E/m = c^2 , it turns into...
Jan29-14 06:03 AM
BruceW
4 391
General relativity talks about curvature of space-time due to mass. What does it actually mean by 'curve'. Is the...
Jan29-14 04:55 AM
nalA
24 1,388
I found a funny video on youtube, but I am not totally convinced by the argument. ...
Jan28-14 05:26 PM
pervect
11 597
The Michelson Moorley experiment to detect the presence of aether is the main experiment that gave rise to the theory...
Jan28-14 03:58 PM
Paul77
3 434
I've asked this question a few times. This time i have tiny change in the question. Instead of people I'm using...
Jan28-14 03:30 PM
PAllen
118 4,666
Here is another train and platform example, offered to examine ghwellsjr's view equating what you see with what is...
Jan28-14 02:34 PM
phyti
31 1,056
Is there a coordinate independent/geometric definition of a tensor density?
Jan28-14 10:45 AM
bcrowell
3 302
Due to the diffeomorphism invariance of GR ##(M, g_{ab})## and ##(M, \phi_*g_ab)## represents the same physical...
Jan28-14 08:37 AM
center o bass
0 273
Here's the scenerio: you have box (shape is not necessarily important, but for simplicity we'll say its a cube),...
Jan28-14 08:15 AM
PAllen
19 991
Yesterday, I read about Hawking's new proposal regarding the firewall paradox. A more general thought about...
Jan28-14 06:09 AM
PeterDonis
4 481
Hi, I would like to share you this video http://video.mit.edu/watch/michelson-interferometer-6561/ By this...
Jan28-14 05:11 AM
powermind
0 385
See below. I screwed up the edit and the use of tex.
Jan27-14 07:20 PM
TimeFall
3 301
Imagine two asteroids which are separed by 1Ly distance. They are in uniform velocity (.9c) with respect to an observe...
Jan27-14 01:17 PM
salvador_dali
13 611
Hi, I'm trying to write down the stress-energy tensor for a single photon in GR, but I'm running into trouble with...
Jan27-14 11:44 AM
bcrowell
5 463
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
PAllen
546 33,387
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
Drakkith
16 551
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
A.T.
5 443
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
ZapperZ
18 1,005
I have heard many physicists (ex:- Michio Kaku) saying "Warp speed" from Star Trek doesn't violate any known physical...
Jan26-14 05:31 PM
JesseM
6 540
I had a discussion regarding the region of spacetime visible to an observer falling into aSchwarzschild black hole....
Jan26-14 03:30 PM
JesseM
18 1,373
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
WannabeNewton
2 314
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
20 1,182
So I just started taking Modern Physics and we are currently discussing special relativity. And needless to say, its...
Jan26-14 09:28 AM
ghwellsjr
13 656
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
5 516
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
12 560
Hello, I was reading a book about general relativity and I came across these two equations $$ \begin{align} ...
Jan25-14 04:37 PM
direct99
5 389
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
6 380
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 1,803
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
4 569
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
4 331
Hi, I'm trying to understand why the metric I've seen for AdS space,...
Jan24-14 11:38 AM
copernicus1
0 236
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
3 459
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
bcrowell
0 253

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