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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 41,673
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 41,319
the starship enterprise wishes to fly to a distant galaxy 85 light years away. at what speed would it have to travel...
Jan24-05 01:25 AM
hype_chicky
3 1,019
I have read several books on relativity and find the subject fascinating. But there are a couple of things that I hope...
Mar1-09 09:34 AM
Naty1
7 1,019
Why no FAQ for the Twin Paradox? There are a few topics for which a FAQ would be very useful. I'd suggest that the...
Jun2-09 09:48 AM
DaleSpam
2 1,019
What is E = \frac{m_{0}c^{2}}{1-v^{2}/c^{2}}
Mar21-12 06:54 AM
granpa
3 1,019
Do photons effectivley travel instantaneously? If not then the question posed by Einstein "If I travel at the speed of...
Nov28-03 10:30 AM
Pyrokenesis
3 1,018
A thought occurred to me when reading the Encarta article on relativity: Now, it occurs to me that the velocity...
May4-04 08:44 PM
turin
8 1,018
I just wanted a quick affirmation. Can light orbit a black hole? That is, can light remain between two well-defined...
Aug4-04 08:17 PM
turin
2 1,018
I like simple physical setups to articulate and generate good thought experiments. Setup: Consider a hole cut in a...
Mar18-06 01:45 AM
my_wan
2 1,018
At what mass does an object start to noticeably bend light?
May14-06 02:50 PM
pervect
3 1,018
Hey ,if we need to calculate time dilation with an accelerating frame of reference,cant we simply use the lorentz...
Jan26-07 11:56 AM
Chris Hillman
4 1,018
Lets imagine a place in space where there is no mass or energy to warp space-time how much would time pass or ...
May28-09 03:31 AM
neopolitan
10 1,018
Lets say we emit a photon from the ground out towards the sky , and as the photon travels away from earth it gets...
Jul8-10 05:45 PM
cragar
12 1,018
so, a bit of confusion here - suppose i have a spaceship that can acheive 0.99999C, and i decide to go to a star that...
Aug2-10 04:22 PM
Doc Al
6 1,018
Given a particular system, how would one construct the stress-energy tensor? I was reading Mallett's paper and the...
Dec30-13 02:55 AM
WannabeNewton
15 1,018
Great Paper with some general calrifications on how Time is percieved in various...
Aug26-04 12:49 AM
marcus
2 1,017
This maybe a simple question, but if Earth orbits the Sun due to the Sun's mass 'curving' spacetime, wouldn't we be...
May16-13 05:43 AM
surprise
20 1,017
This may sound mind numbingly stupid to those who are seasoned in Physics, but how do we know that it is impossible to...
May15-06 03:24 PM
SpaceTiger
4 1,017
Vibrating charges emits electromagnetic waves. Does any vibrating mass is capable of producing wave (that can be...
Sep26-06 05:27 PM
cesiumfrog
5 1,017
Does the theory of relativity include angular motion? Say we have one body synchronously orbiting a motionless body....
Sep5-08 06:41 AM
DrGreg
3 1,017
Hey guys, i was just wondering what would happen if a person was on a spacecraft traveling at 0.9c was standing on a...
Mar15-11 06:06 AM
nsh3a94
6 1,017
I want to find a good reference in GR about the application of tetrad. Is there any good suggestions?
Apr7-11 10:44 PM
xienohp
2 1,017
i constantly feel that newton was right in measuring the relative velocity.einstein makes use of light which has a...
Aug22-11 02:32 AM
harrylin
2 1,017
Is it possible that the metric tensor gmn consist of functions of complex variables? Let say you have a system...
Jun17-13 08:34 AM
WannabeNewton
16 1,017
Has anyone out there downloaded and got working ( a critical point ) the SHEEP package from:...
Feb7-09 01:47 PM
sjsilverman
0 1,016
I read in a book that mass is invariant. Does this mean that an object's mass does not increase as it approaches the...
Dec1-09 02:09 PM
DaleSpam
7 1,016
If time stops at the speed of light, how does light travel throught space and time? Example: The light from a star...
Feb11-10 05:06 AM
Matterwave
3 1,016
Hey, I'm stuck on part of the calculation for the compton wavelength. Basically, my notes go: Energy of Electron ...
Feb14-10 03:53 PM
jtbell
8 1,016
Hi all. Suppose we have two objects A and B, and suppose we tie a rope R to the objects with the rope R's two edges...
Jun19-11 09:30 PM
DaveC426913
5 1,016
I like to try and derive little things by myself if I think it is manageable. One such thing is the addition of...
Dec15-11 11:58 PM
nhmllr
4 1,016
HI guys first post :cool: I need to show that B^2-E^2/C^2 is invariant under Lorentz transformation (E and B...
Apr30-04 09:31 AM
DW
6 1,015
Just seeking a bit of guidance if I may ? If Lambda 1 is the time dilation caused by a gravitational field (ie...
Mar13-09 01:39 AM
taylog1
2 1,015
According to the Biot-Savart Law, the equation for the magnetic field around a charged particle moving with constant...
May5-09 08:51 PM
clem
2 1,015
In my cosmology lectures they say that a negative curvature gives an infinite space but I was thinking what about the...
Feb19-10 07:06 AM
George Jones
3 1,015
When an object moves in curved spacetime, how does its angular momentum vector transform? My hunch is that the...
Oct10-10 03:12 PM
pervect
2 1,015
Let a clock A be at rest in an inertial frame and let a clock B rotate around it with constant velocity and constant...
Feb24-11 04:10 PM
JesseM
3 1,015
Two observers A and B are in relative motion with a constant velocity.If A knows the the position of B accurately ,...
Mar20-11 01:00 AM
Anamitra
3 1,015
What if I shoot a bunch of electrons into a black hole, could I make the coulomb repulsion over come the gravity and...
Jul24-11 02:57 PM
pervect
4 1,015
I was wondering if the electrons change to Tau electrons when an object reaches close to the speed of light. From my...
Apr20-13 06:48 AM
Vanadium 50
10 1,015
Hey guys. I have a question regarding exercise 6.5 in MTW ("Radar Distance Indicator"). The exercise asks the...
Jan4-14 01:12 AM
PeterDonis
12 1,015
The Pauli-Lubanski spin 4-vector for a particle in its rest frame is given by Sμ = (0, Sx, Sy, Sz). (Note this is the...
Dec22-12 11:35 AM
pervect
11 1,014

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