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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 42,472
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 42,123
Hi Just wondering about the orbital path of a high speed particle - eg electron in orbit. Is it length contracted?...
Aug2-14 11:24 PM
jartsa
3 350
Hi I have a new formula (or at least I think it's new) for predicting the wavelengths/frequencies of hydrogen's...
Aug2-14 03:35 PM
DaleSpam
1 355
I was thinking a bit earlier: What if you created a particle at infinity (ignore the normal particle rules for...
Aug1-14 10:43 PM
pervect
2 268
I recognize the analytical usefulness of having time, a parameter. However, does time really exist? If so, is there a...
Aug1-14 11:37 AM
ChrisVer
21 649
Considering that speed of light is constant and finite, then why are the time dilatation and length contraction...
Aug1-14 10:16 AM
tonyxon22
6 363
We know that distant galaxies (which are expanding) are sometimes expanding at rates that do not conform with our...
Aug1-14 08:22 AM
Drakkith
2 260
From my understanding and from what I have read Quantum Mechanics and Relativity do not mix well. I understand that...
Jul31-14 10:37 PM
WannabeNewton
3 319
This may be a stupid question, but have the various gravitational wave observatories around the world been tested by...
Jul31-14 03:42 PM
PeterDonis
2 224
A general summary of the experiment is that when the light clock is stationary on the platform it runs as normal, up...
Jul31-14 01:04 PM
tonyxon22
24 1,264
Iíve been thinking about Einsteinís gedankenexperiment (because Iím meta like that) regarding the sealed room on...
Jul31-14 11:52 AM
Nugatory
13 334
Constant for all observers? I have heard that maxwell showed that the speed of light is constant for all observers...
Jul29-14 07:54 PM
DaleSpam
46 2,973
The basic question was inspired by some other recent threads on the "fabric of space". If we imagine a 2-d spatial...
Jul29-14 05:44 AM
haael
4 379
I've always been interested in Space-Time fabric and have been trying to get a clear answer to whether or not its an...
Jul29-14 02:12 AM
Bandersnatch
14 812
I've read that the Alcubierre Drive depends on the existence of negative mass, but I've seen that physicists say it...
Jul29-14 02:06 AM
Simon Bridge
1 268
Isn't the force of gravity just a result of the shape of space as it is affected by masses within it? Why is it...
Jul28-14 08:05 PM
pervect
3 452
Hi all. I'm working on a project that requires me to perform calculations in Fermi normal coordinates to certain...
Jul28-14 05:47 PM
George Jones
3 474
Hi, I am trying to show explicitly the isotropy of the stress energy tensor for a scalar field Phi. By varying the...
Jul28-14 11:27 AM
George Jones
7 606
I want to write a science-fiction story concerning the rapid increase in technology affecting the speed at which...
Jul28-14 09:13 AM
ghwellsjr
3 518
According to Einstein (e.g. in his book The Meaning of Relativity), a clock rotating about a central clock will be...
Jul28-14 12:51 AM
HALON
21 2,719
Whatever spacetime be made of strings or some other erotic substance it seems that it doesn't have mass so what causes...
Jul27-14 07:39 PM
DaleSpam
13 569
Thinking about how so much matter can be squeezed into a singularity, the answer (if I understand correctly) is that...
Jul27-14 03:40 PM
Vanadium 50
6 853
Hi, I would be really grateful if someone could help me with two questions I have, both have puzzled me on and off...
Jul27-14 10:33 AM
CraigDxHypo
16 1,026
I have a metric given as a line element differential ds^2. I have written down the 3x3 matrix with the coefficients. ...
Jul26-14 06:56 PM
ChrisVer
8 500
What does it mean to boost something along the z axis? To give some acceleration to it, or to spatially translate it?...
Jul25-14 09:52 PM
WannabeNewton
4 531
So I was thinking about the space time field and trying to wrap my head around how it is actually bent around a mass. ...
Jul25-14 12:38 PM
Nugatory
1 488
If velocity is relative and if we cannot say which is moving away from what *objectivley, how do we say that time...
Jul25-14 01:23 AM
objecta99
61 4,161
It is my understanding that at the most fundamental level, a black hole is simply an object with a gravitational field...
Jul24-14 03:31 PM
willoughby
17 899
I was reading Einstein's paper "The Foundation of the General Theory of Relativity" and as i understood, he tried to...
Jul24-14 08:03 AM
nixed
3 1,006
We measure time based off of atomic vibrations, so time dilation from gravity and velocity are nothing more than...
Jul24-14 06:31 AM
DaleSpam
12 1,002
Hello everyone! My question is this: Do we believe time is a constant and forces such as gravity affect our perception...
Jul23-14 12:18 PM
DaleSpam
41 4,109
Is there a simple intuitive description of what the Ricci tensor and scalar represent? I have what seems to me a...
Jul23-14 11:24 AM
robphy
5 899
1. What exactly is the cosmological constant, what is its value (or how do you derive it if it is something that must...
Jul22-14 09:43 PM
bcrowell
2 736
I was wondering why can't I use formulas from the "Special Relativity" in cases like: F=mv^2/r Or F=qvēB...
Jul22-14 12:56 AM
ghost313
2 691
Are there any EXACT solutions similar to Schwarzschild or Kerr in a spacetime which is not asymptotically flat; e.g....
Jul21-14 01:36 PM
George Jones
3 1,332
Hello everyone. I am attempting to teach myself about special relativity, and have learned a derivation for the...
Jul21-14 01:31 PM
toothpaste666
8 1,114
I got stuck in deriving the velocity of the particle from the acceleration equation. Here are the details of the...
Jul20-14 10:07 PM
ecastro
6 1,374
Hello. I'm a layperson curious about physics. I've read that Quantum Gravity could eliminate the predicted...
Jul20-14 06:22 PM
sshai45
11 1,809
I have recently gone over the derivation of the stress energy momentum tensor elements for the special case of dust....
Jul20-14 04:42 PM
space-time
4 1,089
*Edit: I noticed I may have posted this question on the wrong forum... if this is the case, could you please move it...
Jul19-14 10:23 AM
coleman123
8 2,203
its been years since I took a physics course so I might have what amounts to a really dumb question. However, I got...
Jul19-14 10:21 AM
objecta99
19 2,153

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