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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 41,462
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 41,081
Well...i have found the laws and theories related to relativity quite disturbing...few laws like the newton's stating...
Oct3-11 01:05 PM
darkhorror
3 1,384
For a time-like interval between 2 events, it is impossible to find an inertial reference frame in which the events...
Oct3-11 12:57 PM
PAllen
5 1,895
My first question, so sorry if it's in the wrong forum. I'm trying to understand the Newtonian weak field...
Oct3-11 12:26 PM
peter46464
5 1,586
I'm a lay person who is interested in developing a better understanding of science in general, as well as specific...
Oct3-11 02:09 AM
logics
65 6,101
The main, or one of the main, arguments I hear about neutrinos flying faster than light is that it would violate...
Oct2-11 09:13 PM
Saw
11 3,059
Hey, does anyone know where I can find the correct metric for a rotating disk? Is the article at this link correct? ...
Oct2-11 05:33 PM
Doc Al
11 2,121
Hi all, I've been reading some general relativity in my spare time (using Hartle). I'm a bit confused about...
Oct2-11 11:52 AM
jfy4
7 2,210
I was reading "Reinventing Gravity - A Physicist Goes Beyond Einstein" by Mr. John Moffat, btw it's a really good book...
Oct2-11 08:39 AM
Naty1
8 2,172
Here is a simple one. An observer far away from a black hole emits a light pulse every second. A second observer has...
Oct2-11 02:17 AM
Passionflower
10 1,729
I am trying to formulate an integral representing Tau between two r-values for radial motion in the Schwarzschild...
Oct1-11 04:03 PM
PAllen
3 1,159
So, energy equals mass times the speed of light squared. Energy can determine speed, because the energy is...
Oct1-11 11:47 AM
WannabeNewton
1 870
Hi I'm new and an idiot so please don't burn me, I wouldn't have come to a specialist forum if I could have found the...
Oct1-11 06:34 AM
phinds
4 2,232
I am a beginner in this field. I have read Special theory of relativity by Einstein, but the one written for...
Sep30-11 04:38 PM
DaleSpam
8 1,796
I was talking with my friend and the best answer i could come up with is "It does." But, i could not explain why....
Sep30-11 11:50 AM
ThomasT
36 5,413
A blue guy and a red guy are moving at the same speed in opposite directions with respect to some rest system as...
Sep29-11 07:36 PM
bobc2
17 2,860
Alright I've asked before but this is still bugging me. given that the mass energy equation is this ...
Sep29-11 02:13 PM
DrStupid
15 2,575
How do Maxwell's equations predict that the speed of light is constant? I found different answers and some people even...
Sep29-11 11:21 AM
fizzle
11 6,863
Having trouble trying to wrap my mind around how two reference frames (both in motion) can observe a third reference...
Sep29-11 10:20 AM
M. Bachmeier
0 667
For the universe to be totally flat, and not just asymptotically closer to being flat as the universe expands,...
Sep29-11 08:44 AM
kmarinas86
8 1,926
if a rocketship in space is approaching the speed of light and its relative mass is increasing then i assume the fuel...
Sep28-11 04:58 PM
?????
3 2,871
A formula I know for the number of functionally independent components of the curvature tensor is: (n^2)(n^2 -1)/12....
Sep28-11 03:03 PM
Ben Niehoff
78 6,008
i have read about Hawking's theory of BH radiation based on the idea of spontaneous particle pair creation at the EH...
Sep28-11 02:55 PM
PeterDonis
1 844
Greetings, I have been having trouble deriving the equation for the general Lorentz boost for velocity in an...
Sep28-11 08:06 AM
3nTr0pY
10 4,679
I tried to search everywhere but couldn't find an answer, so here it goes. In Newtonian mechanics, the...
Sep27-11 10:27 PM
Passionflower
8 2,996
I've been looking into the history of the speed of light values and when the last accepted value was set at. This...
Sep27-11 06:36 PM
Mordred
13 1,991
for an inverse square field the force is proportional to 1/r^2 obviously we integrate over distance to get energy ≡...
Sep27-11 12:57 AM
Parlyne
10 1,554
I am currently trying to self learn general relativity. I understand you need knowledge of an action principle, but...
Sep26-11 09:22 PM
PAllen
3 1,150
Firstly, hello. This is my first post at Physics Forums, and I want to thank everyone in advance for contributing...
Sep26-11 03:17 PM
DaleSpam
3 1,244
Why does faster than light travel or propagation mean time travel backwards to violate causality?
Sep26-11 02:58 PM
DrStupid
36 7,010
So there's something that has bothered me for quite some time. I know the normal equations of time dilation and...
Sep26-11 12:08 PM
spacelike
2 813
Suppose, in the first case, that an object (initially at rest in frame S) accelerates, for whatever reason upward,...
Sep26-11 12:55 AM
sudhirking
4 1,065
MTW 25.29 v.s. 25.38 (first formula) Yesterday I made a quick calculation for a radially free falling observer in a...
Sep25-11 05:23 PM
pervect
14 1,375
Hi, I wonder, if we have two spaceship and they are moving tovard each other at the same 0,9c speed. what is the...
Sep25-11 04:52 PM
harrylin
4 1,789
...shouldn't it: 1. become asymptotic to c as you pump more energy into it? 1a. don't I need to a lot more energy...
Sep25-11 01:11 PM
kmarinas86
3 1,548
I was reading on relativity and the speed of light being constant and I thought of a something that seems too...
Sep25-11 01:09 PM
anarcher
25 7,156
If you have three observers A, B, and C, if A is running backwards in time according to B, and B is running backwards...
Sep25-11 12:43 PM
kmarinas86
8 1,143
Greetings, First of all I believe this is the right forum as it isn't necessarily homework but more of a discussion...
Sep25-11 11:04 AM
Naty1
1 2,408
I was reading through my textbook and it said that the angle between the axes of two inertial frames, one stationary...
Sep25-11 09:41 AM
Bill_K
2 1,946
Hello, I just spent some time reading the recent OPERA-CNGS paper on apparently FTL neutrinos ...
Sep25-11 05:24 AM
Ryan_m_b
2 1,438
I've been reading through a book on relativity and I came across this \mathcal{E}=p . v - L \mathcal{E} =\frac{m...
Sep25-11 04:54 AM
genericusrnme
2 873

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