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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 42,795
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 42,434
Okay, everyone, I know that this is sounds like a set-up question. And that's because it is. But please humor me,...
May27-04 11:51 AM
russ_watters
8 1,046
How can a smooth deformation of a Lorentzian manifold possibly create one or more singularities?
Feb1-07 08:53 PM
quantum123
2 1,046
Hi, How would go about arguing that the Stress-Energy tensor is actually a tensor based on how it must be linear in...
Oct22-09 07:16 PM
Azrael84
2 1,046
The derivaton I have seen (for a Schwarschild black hole) is this One imagines a mass m attached to a long (well...
May27-10 01:37 AM
yuiop
2 1,046
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 1,046
I understand that energy depends on mass but why multiply it by C˛ and not some other constant ? Several...
Jan28-12 03:59 PM
Matterwave
1 1,046
I have recently began to read about special relativity. I think I've got a decent grasp of how it works, but I have...
Apr10-12 10:47 PM
yuiop
7 1,046
Hi, I have some trouble with Theorem 2.2.1 in Wald's GR book p.15. He derived formula 2.2.5 by using 2.2.4. Here,...
Jun14-12 04:32 AM
syhpehtam
1 1,046
How will light switched on from a space-craft moving faster than c appear( hypothetical space-craft) to a ground...
Jul3-12 12:46 PM
micromass
10 1,046
Studying the movement of a particle on bound orbits around a black hole I found a fact that seemed a little strange...
Jul16-13 07:17 PM
pervect
11 1,045
Hi, I hope asking in right forum. I'm trying to understand proper time concept but I'm afraid couldn't...
May17-13 08:25 PM
pervect
15 1,045
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 1,045
The Schwarzschild Solution to Einstein's Field Equations for gravity are said to be exact when outside a spherically...
Sep13-09 04:02 PM
atyy
4 1,045
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 1,045
As long as there is any energy/mass at all in our universe, time will always be in a "slowed" state. So, let's say we...
Feb26-11 03:42 AM
John232
9 1,045
I am steadily working my way through D'Inverno and have reached Chapter 20. On page 272 there is a problem which goes...
Nov22-12 12:35 PM
TerryW
3 1,045
Where can I find a picture of the magnetic field lines produced by a charged particle moving near the speed of light? ...
Aug31-13 07:41 PM
Albertgauss
6 1,045
Hello guys! I've been trying to get some intuition for differential forms. I know the formal theory and I know how...
Jul2-14 09:26 AM
micromass
2 1,045
Perhaps it is a stupid question, but really confuses me. In QFT, virtual particles can be produced from vacuum, say,...
Jun27-05 02:58 PM
hellfire
1 1,044
My question is, which photon is the one that first hits the square in the following example If I had a large...
Jan11-10 07:35 PM
Zula110100100
5 1,044
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 1,044
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 1,044
i strongly suspect that there is mathematical constraint on space time whicg is differensiable function ofmetrics and...
Jun28-04 08:06 AM
einstein_vishnu
0 1,043
Here's a scenario I thought of a few days ago. I know there must be an easy explanation, but it hasn't come to me ......
Nov24-04 01:46 PM
PBRMEASAP
2 1,043
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 1,043
I'm starting to get (Already am) really annoyed at how it is impossible to find an answer to what gravity is. For...
May20-13 10:40 AM
slibbfalusken
11 1,043
There are 2 people, who are twins. One was born on earth, and the other was born in space. Because earth orbits the...
Aug4-05 11:33 AM
professor
8 1,043
This extract is from Bridgman, A Sophisticate's Primer of Relativity. 1962 Page 28. Only the last couple of sentences...
Oct24-09 12:00 PM
Cleonis
9 1,043
Say we have dust filled universe. At some instant of time this universe has a mass density rho, and it evolves with...
Dec21-09 08:20 PM
George Jones
2 1,043
Question: As an object approaches C and its length contracts, does space-time contract also, causing the a larger...
Mar30-10 03:28 PM
brainstorm
5 1,043
Hello! I'm trying to get my head around general relativity at the moment...(!), and there's one aspect of it that's...
Apr24-11 08:56 PM
JesseM
6 1,043
I recently watched a documentary on Albert Einstein that said the inspiration (or epiphany I guess) for the slowing of...
Jul27-12 11:15 PM
claytonh4
4 1,043
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 1,042
so according to relativity, gravity is rly curves in space time. I imagine this in a 2d context, with a 2d world...
May5-05 08:37 PM
michael879
14 1,042
In the 3+1 formulation of GR we have the following basic variables: g_{ij} = \textrm{metric on a spatial surface}...
Nov29-06 06:12 PM
shoehorn
0 1,042
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 1,042
Is there an easy way to see this? can it be see via the penrose diagram? does it have anything to do with how when a...
Apr3-12 10:26 PM
George Jones
2 1,042
Can anyone explain to me what is contravariant and covariant? I just know that they are tensors with specific...
Sep20-05 12:24 AM
pervect
2 1,041
if a ship is going at half the speed of of light (just imagine okay) and there is a light in the center of the ship...
Nov8-05 10:05 PM
franznietzsche
7 1,041
Hi, I'm not a physicist and my idea of relativity is limited by wiki... but I have one question... If I sit with...
May2-12 01:09 PM
HallsofIvy
7 1,041

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