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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
1 42,388
The section of the Usenet Physics FAQ titled "Experimental Basis of Special Relativity" has been cited here many...
Dec31-07 02:06 AM
0 42,035
We are trying to find the relative velocity in a Lemaitre observer's frame, when said observer passes an observer...
Jan22-14 05:06 AM
15 599
After learning about special relativity, and the behavior of light, I do not understand why light is not able to reach...
Jan21-14 05:36 PM
41 1,772
The full Lagrangian for electrodynamics ##\mathcal{L}## can be expressed as ##\mathcal{L}=\mathcal{L}_\textrm{field}+...
Jan21-14 09:21 AM
2 369
I've written an open-source book on special relativity: . It's a work in progress,...
Jan20-14 09:35 PM
2 375
In the wikipedia page a distinction is made in the definition of the SR 4-acceleration between the case with...
Jan20-14 03:32 PM
4 380
I remember reading something, long ago, to the effect that any attempt at creating a CTC would be doomed by energy...
Jan20-14 01:30 PM
4 356
If you don't have any charges or currents, the electromagnetic Lagrangian becomes...
Jan20-14 12:33 PM
14 528
The Lagrangian for a point particle is just L=-m\sqrt{1-v^2}. If instead we had a continuous distribution of matter,...
Jan20-14 11:16 AM
10 498
I am just wondering - is space-time curvature in the presence of energy-momentum ( i.e. in interior solutions to the...
Jan20-14 08:26 AM
Markus Hanke
4 318
Two twins A and (evil) B. Twin A remains "stationary" while evil B goes at near light speed to-and-fro. Ignoring...
Jan20-14 02:36 AM
10 480
Is there any reason to think that that the speed of light could vary with time (taking t=0 at Big Bang), ie, could...
Jan19-14 03:27 PM
28 1,505
I want to ask General Relativity is a force or Its a theory which explains how to space-time curve and space-time...
Jan19-14 02:37 PM
1 300
Hi, In his original paper, Schwarzschild set the "'equation of the determinant" to be: |g|=-1. In other words, he...
Jan19-14 02:09 PM
Rob Sfic
17 820
A satellite orbiting the globe at some 300 miles at 18000 mph. Does the clock on the GPS tick slower or faster than...
Jan19-14 12:04 AM
2 293
If I start with the standard FRW cosmology equations, $${\eqalign{ 3\dot a^2/a^2&=8\pi\rho-3k/a^2\cr 3\ddot...
Jan18-14 11:23 PM
5 452
In the special relativity the conservation of energy and momentum is represented by the equation:...
Jan18-14 07:02 PM
21 841
Hi All, Long time no post! I've asked a highly-related question to the one I'm about to ask here, but there's a...
Jan18-14 12:42 PM
34 1,882
Ok folks, I've taken a stab at the Latex thing (for the first time, so please bear with me). I've mentioned before...
Jan18-14 09:49 AM
3 323
If I start with the stress-energy tensor T^{\mu\nu} of the electromagnetic field and then apply energy-momentum...
Jan17-14 11:05 AM
5 625
According to Wikipedia, This definition doesn't sit well with me. Flux is defined as the rate that something...
Jan16-14 10:31 PM
10 518
Here is a excellent book on special relativity and world lines. ...
Jan16-14 08:56 PM
0 336
I would appreciate views on the following understanding of length and distance in SR, restricted here to inertial...
Jan16-14 04:52 PM
73 2,827
If gravitational waves cause fluctuations in space time, than could all gravitational waves, large or small all would...
Jan16-14 03:32 PM
0 282
So I've been reading Einstein's theory of relativity, and at one point when discussing the Lorentz equations' proof...
Jan16-14 12:45 PM
3 322
Does \eta^{\alpha \beta}=\eta_{\alpha \beta} in all coordinate systems or just inertial coordinate systems?
Jan16-14 11:43 AM
3 342
I want to know how force works in relatvistivc mechanics.I searched it and I know the formula but I didn't know how it...
Jan16-14 12:34 AM
19 1,062
If the space around the earth is curved according to general theory of relativity no lateral force is required to put...
Jan15-14 05:00 PM
6 368
I never seen any intuitive interpretation of the LHS of the equations. I realize the question is a tall order. But i...
Jan15-14 04:31 PM
7 475
I'm trying to figure out if there is an deep or simple relationship between the following two facts. (1) A stick,...
Jan15-14 01:28 PM
6 642
Hi! How this paper relates to the equivalence principle? "in contrast to...
Jan15-14 09:52 AM
3 456
Broad title, but really a specific question that I thought should be straightforward, but got stuck. Consider the...
Jan15-14 09:47 AM
2 478
I know E=mc2 essentially means energy = mass. One might think why not just say E = m? But I also know that: Every...
Jan15-14 02:38 AM
10 1,077
The most famous time traveling paradox is the Grandfather Paradox, where the traveler goes back in time to kill his...
Jan15-14 01:06 AM
Vanadium 50
4 441
If I had a spoked disc made of unobtainium that could be spun up to .9999c outer rim speed, what would it look like as...
Jan14-14 07:50 PM
14 697
In a number of threads over the years the idea has been discussed that if odometers were as well defined as (and as...
Jan14-14 04:07 PM
53 2,184
In general relativity, the source of the gravitational field is the "stress-energy tensor" I know that thing is not...
Jan14-14 12:31 PM
28 1,629
If a spacecraft moving near the speed of light has a camera set up inside observing the people in the spacecraft, and...
Jan14-14 09:41 AM
2 642
Let us say that we have small object of mass ##m## at some location far away from the earth (with zero velocity...
Jan13-14 10:47 AM
7 604
Does anyone have any favorite applications of the acceleration four-vector? More specifically, the WP article...
Jan13-14 10:22 AM
George Jones
3 626
Gravitomagnetism is this thing Like electromagnetism equations, but...
Jan13-14 07:18 AM
48 2,059

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