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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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Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Feb23-13 08:40 AM
1 37,478
The section of the Usenet Physics FAQ titled "Experimental Basis of Special Relativity" has been cited here many...
Dec31-07 02:06 AM
0 37,214
Hello guys , beside Einstein's General Theory of Relativity by hervik , is there any lecture or book about this case ?...
Nov13-12 02:44 AM
3 923
So Newton says that gravity is an attractive force and some people believe in gravitons to transmit that attractive...
Feb21-13 02:04 PM
6 923
Hello. I've been out of college for 10+ years now, but have never lost the desire to learn more. So I've been trying...
Apr7-09 09:25 AM
1 922
Hi This is regarding the pinhole camera concept regarding apparent angular size. If we take the simultaneity...
Sep4-09 02:15 AM
2 922
with the action \int (k(R- 2 \Lambda)+L_m) \sqrt{g} the Einstein equation is: R_{uv}-\frac{1}{2}R g_{uv}- \Lambda...
Dec27-10 05:30 AM
1 922
Hey guys, I just had a quiz on relativistic energy and there was a question on there that I was sure I got right but...
Mar8-11 09:21 PM
5 922
Two spaceships are traveling relative to earth (stationary). One spaceship is going to the right at 0.8c the other is...
May8-11 08:23 AM
3 922
Hi, I am wondering if the cosmological constant is a constant in the sense that it can only have one value, ie some...
Jun23-11 07:01 AM
5 922
In a slightly disturbing episode of futurama, Fry (the main character) goes back in time and through a series of...
Jul17-11 07:33 AM
George Jones
5 922
2 electrons are travelling around a black hole, after some time they meet themselves exactly at the horizon of the...
Apr19-06 02:48 PM
George Jones
2 921
hi. 1. Why does the sign of the metric have to be (+,-,-,-) or (-,+,+,+)? meaning why does the sign in front of...
May23-07 01:08 AM
1 921
see the attchments Referring to fig 1 We have a clock that is used to set the time on a second clock. At point A...
Apr3-08 05:09 PM
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I have two questions here: 1. As photons have no mass, why does light have a limited speed? 2. When the special...
Apr30-09 12:31 PM
1 921
I apologize for the poorly worded title. Let me try to explain my question better. A scientific theory must be...
Oct19-09 09:06 PM
4 921
I saw today in Ohanian's book: "It is convenient to separate particle energies into kinetic and rest mass energies:...
Jan27-10 05:48 PM
1 921
This is not a question about relativity per se, but relates to it sufficiently I hope. Standard values for many...
Nov17-11 07:35 AM
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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
3 921
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
11 921
Actually, this is one of the question I was wondering about. If mathematics allows for wormholes (And there's really...
Sep29-04 03:32 PM
7 920
This thread is slightly related to another question: I was...
Feb4-06 07:30 PM
1 920
this isnt a homework question, incidentally All the foormulas for time dilation, relaitivsitc momentum, do they...
Feb19-06 07:31 PM
1 920
Is the relativistic mass the reason that objects with mass cannot reach the speed of light? >> The book gave it as...
Jan4-09 02:20 PM
1 920
An electromagnetic field, as a plane wave, has a known space-time dependence: E = E0cos(ωt-kx). In a transparent...
Sep27-09 09:29 AM
5 920
Ok, I've looked a bit into your Posts. The problem is, I suck at math (i.e. differential geometry). So please tell...
May13-10 01:22 PM
Chris Hillman
31 920
Hello, It's well known that the action for a relativistic point particle is: S=-m\int...
Nov22-10 02:08 AM
2 920
Hi Guys and girls First have very little knowledge of this stuff, but watched a tv program today that made my head...
Dec20-10 02:54 PM
3 920
I understand that General Relativity is built on the Equivalence Principle. Apparently there is a approximation to...
Oct14-11 11:08 AM
0 920
We know that 1. Mass causes bend in space-time and this is the how gravitation occurs. 2. The formula for...
Jan20-12 10:55 AM
2 920
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
1 920
Hello there! I have a more or less silly and possibly obvious question that's been bugging me a lot. Here's the...
Dec4-13 02:54 PM
George Jones
8 920
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
20 919
has there been done any experiments to find out how electricfieldlines are affected by gravity? What do theory tell us...
Jun7-05 02:20 AM
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(see attachment)
Mar29-08 12:28 PM
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Consider a particle that moves with speed V in the positive direction of the OX axis of the inertial reference frame...
Jul27-08 04:29 AM
1 919
I am trying to get my head around some of the basics of relativity. dt' = ydt Where dt is the time between 2...
Mar10-09 10:00 AM
1 919
Does anybody know where I can see the Penrose diagrams for COLLAPSING charged or rotating black holes? Those diagrams...
Sep14-09 09:32 AM
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Is it possible to calculate the speed at which a massive object warps the fabric of space? Does the mass of said...
May9-11 05:27 PM
3 919
If earth is here 0 and I go at 90% the speed of light in that direction <--in my space ship and my friend is going...
Jan27-12 01:01 AM
2 919
i dont know this question goes at the right place but i would like to know why speed of light remains constant ...
Apr15-12 08:44 PM
5 919
Hi, I'm a EE PhD student working a little bit out of my area, and have just gotten stumped trying to figure out the...
May19-12 03:26 PM
3 919

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