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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 41,528
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 41,160
Do all massless particles travel away from you at the speed of light regardless of you speed . i know light does ,...
Nov26-09 12:16 AM
cragar
4 1,212
A Lorentz boost along the x axis conserves area in the x-t plane. Can anyone think of an argument to prove this fact...
Nov25-09 04:22 PM
bcrowell
44 3,724
Wald says (paraphrased) "Let us attempt to destroy a black hole and create a naked singularity. Kerr-Newman black...
Nov24-09 03:38 PM
lark
0 772
According to Wikipedia: Objects and radiation can also escape from the ergosphere. In fact the Penrose process...
Nov24-09 03:37 PM
Frame Dragger
6 2,175
Hi all!! Anyone knows where to find, online or on a book, the affine connection for the schwarzschild metric? Thanks
Nov24-09 08:40 AM
alle.fabbri
5 2,050
Hi everyone, I'm trying to work through section 86 of Landau and Lifgarbagez volume 2 (The Classical Theory of...
Nov24-09 06:03 AM
lalbatros
4 2,590
I don't understand why this happens. And it's not enough to tell me 'well it happens because Simultaneity is...
Nov24-09 03:20 AM
A.T.
15 2,755
Einstein proposed a very simple derivation to E=mc^2 in 1940s which is well-known as Einstein’s box and a brief...
Nov23-09 10:21 PM
DaleSpam
10 1,263
If we have a tank which full of water.Then,emitted the light into the tank.The speed of light is c/n . If we can run...
Nov23-09 10:20 PM
IPhO' 2008
7 1,090
When we use the Lorentz transform. We must have S,S' frame. How can we choose S,S' frame?
Nov23-09 10:16 AM
atyy
6 1,028
A and B are twins,A notice B moving away from him with velocity v, so A notice that B is youngerv than him (time...
Nov23-09 09:19 AM
HallsofIvy
3 946
Why the speed of light decreases when it is in the medium? Thank you.
Nov23-09 08:21 AM
jtbell
1 979
In quantum mechanics, the phase velocity is f/k=E/p because of E=hf and p=hk where k=1/wavelength. In special...
Nov23-09 03:19 AM
clamtrox
14 2,934
If Einstein's box (http://galileo.phys.virginia.edu/classes/252/mass_and_energy.html ) is full of phonons instead of...
Nov23-09 12:19 AM
sunroof
4 1,399
In the classical wave theory, the formula of Doppler effect is f ' = f (1+V/u) where u is the light speed. In vacuum,...
Nov22-09 08:23 PM
sunroof
0 1,112
Hi, the theory of relativities second postulate is:- The speed of light in a vacuum is the same for all...
Nov22-09 11:49 AM
Paul77
17 2,346
From my reading of introductory texts on special relativity, I've seen this defined in various ways, and I'm curious...
Nov22-09 08:19 AM
Rasalhague
8 4,572
With blackhole and hawking radiation's help, i come up with an idea to convert my apple completely into pure energy...
Nov21-09 11:37 PM
magnetar
3 1,574
This may be farfetched, but please try to bear with me. I will try to apply my existing knowledge of fields to...
Nov21-09 07:02 PM
espen180
0 826
What should an ancient old non-mathematical fossil do when trying to understand GR? I'm reading "Gravity" by Shutz,...
Nov21-09 06:27 PM
atyy
5 842
types of metrics 5d in that einstein tensor is diagonal???? i need a metric 5d in that G_{00}=G_{11}=G_{22}=G_{33}...
Nov21-09 05:53 PM
alejandrito29
0 1,038
To a moderator: this is a theoretical, concept-based question. Say two balls of putty, moving relativistically...
Nov21-09 05:03 PM
DaleSpam
3 1,451
There's a video camera at a railway station. It can see the driver in the front of a fast moving train going past in...
Nov21-09 01:53 PM
YellowTaxi
0 891
The experiment showing that, time is relative, and how it changes with velocity and gravity. Einstein's twin...
Nov21-09 09:41 AM
russ_watters
44 4,948
Hi all, I m not a physicist but a biological oceanographer. I would like to know how should I consider space-time...
Nov21-09 08:31 AM
A.T.
1 833
looking at this thread, Has einsteins experient with time been proven, why hasn't it been applied or used ( 1 2 3) ...
Nov21-09 12:11 AM
ensabah6
0 2,536
The gravitational shift of a photon in vacuum df/f=gH/c^2 had been confirmed by Pound and Rebca in 1960s. As to sound...
Nov20-09 07:22 PM
sunroof
0 1,173
the metric is ds^2=f(x,y)(dx^2+dy^2)+dz^2-dt^2 G_{tt}=-G_{zz}=-\frac{1}{2f(x,y)}\nabla^2(ln(f(x,y))) the energy...
Nov20-09 06:46 PM
alejandrito29
0 527
So, for example, 2 objects are moving towards each other. There is a frame where 2 object move with (for the sake of...
Nov20-09 12:38 PM
jtbell
1 629
Suppose there is a square mass object in the universe (I know its impossible, but suppose...). Does spacetime will...
Nov20-09 08:43 AM
hamilton00989
3 847
I do aware that it is impossible to be in a frame with C velocity. But suppose I could ride a photon (suppose)....
Nov20-09 06:46 AM
DaleSpam
3 1,241
Can anyone answer this? GPS satellites are preprogrammed before launch due to relativistic effects mainly time...
Nov19-09 11:32 PM
yogi
119 10,745
I hope I can explain my question clearly enough for someone to answer. Suppose we wish to estimate the power...
Nov19-09 08:12 PM
qraal
3 4,254
I would appreciate any insight into these questions; I have had a little EM but no general relativity. Maybe general...
Nov19-09 04:19 PM
yuiop
1 1,054
The electromagnetic energy density is well-defined through the square of the Maxwell Field tensor. Why cannot such a...
Nov19-09 01:46 PM
ringerha
7 1,532
I did a thought experiment for myself today to test whether energy is conserved in Lorentz transformations. I chose...
Nov19-09 12:05 PM
espen180
4 948
The resonating frequency of a series LC circuit is given by: f=(c/2πn) This frequency measured in a moving frame is...
Nov19-09 06:41 AM
DaleSpam
15 1,441
This question was asked by a friend recently, and I couldn't give an answer! To an observer on the Earth, when...
Nov19-09 02:32 AM
jambaugh
17 3,746
Can anybody provide me with a link to a REAL life experiment (a credible source, and not a thought experiment. )...
Nov18-09 08:48 PM
crx
4 876
i am read a paper of name: "formalism for an extended object"(in spanish).. a sub manifold of coordinates y^i...
Nov18-09 05:11 PM
alejandrito29
2 787

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