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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 42,799
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 42,438
Hiya, I am a grad student who has had a couple semesters of GR. I am currently perusing a book about Two Spinors in...
Feb10-14 02:34 PM
dozappp
0 317
I thought that one of the features of GRT was to allow for ACCELERATING reference frames. Yet none of my textbooks...
Feb10-14 11:38 AM
DaleSpam
15 875
There are only two frame moving relative with each other at certain velocity. One frame see the other going right and...
Feb10-14 09:22 AM
Nugatory
1 343
The popular thought experiment states, that if of two identical twins one is left on earth an the other is embarked on...
Feb10-14 09:14 AM
scienalc
2 402
Hi, I decided to learn about relativity with this book, and I'm looking for people who would like to read it with...
Feb9-14 05:19 PM
strangerep
3 640
page 71 he appears to define the affine connection in terms of derivatives on the locally inertial coordinates with...
Feb9-14 04:39 PM
thoughtgaze
9 439
I had a quick question about Time Dilation and Length Contraction. Are the two just different ways of...
Feb9-14 01:41 PM
phyti
14 571
From what I understand, Hawking radiation results when one virtual particle (of the pair) falls into the black hole...
Feb9-14 12:17 PM
PeterDonis
1 360
I am trying to derive the geodesic equation by extremising the integral $$ \ell = \int d\tau $$ Now after applying...
Feb9-14 11:47 AM
Nabigh R
3 380
I have a question regarding world lines and Minkowski diagrams. I have been looking everywhere for an answer and can't...
Feb9-14 02:27 AM
ghwellsjr
2 453
Thanks for the answers on my previous thread, it made some sense, and if I'll reply if there's further misconception....
Feb8-14 03:12 PM
phyti
42 1,861
Hi, I'm just beginning to learn relativity, but I have a question about why gravity is so different from other...
Feb7-14 08:08 PM
WannabeNewton
4 553
hi everyone. i'm having trouble understanding the concept of proper time in general relativity. suppose we have...
Feb7-14 06:04 PM
pervect
31 1,083
I have a pretty basic question - one that should have occurred to me long ago, but I never really thought about...
Feb7-14 03:12 PM
A.T.
11 558
I'm not sure if this is the right forum. I'm sorry, but I'm not good at Physics or English (which is not my first...
Feb7-14 01:02 PM
waitedavid137
8 563
Hello! This is regarding problem 10.4 in Wald. Let ##(M,g_{ab})## be a space-time, ##\Sigma_{t}## be a one parameter...
Feb7-14 09:25 AM
WannabeNewton
7 923
We know the equations for speed of rotating magnetic field, as N= 120*f/P, where f is frequency of AC currents & P is...
Feb7-14 07:16 AM
Bill_K
1 471
The velocity of an object can, theoretically, only be measured relative to the velocity of another object. If I...
Feb6-14 01:45 PM
Glurth
9 437
In classical mechanics we talk about homogeneous and inhomogeneous gravitational fields. Do we do this with...
Feb5-14 09:35 AM
DaleSpam
1 257
There is a connection between the origin and the points in the light cone.That is to say,there is a casual...
Feb5-14 12:17 AM
bcrowell
13 772
In flat spacetime, there exists a natural connection that allows you to compare two vectors at different events. Now,...
Feb4-14 05:33 PM
dextercioby
23 1,047
EDIT dw i figured it out, not sure how to remove it though!
Feb4-14 03:28 PM
tommyj
4 542
Lets say I fall into a super-massive black hole's event horizon. Facing outwards towards the event horizon (with the...
Feb4-14 12:03 AM
Glurth
15 804
Hi, I'm doing the master in science and one of things that I have to study is the Gödel metric. His paper have a high...
Feb3-14 08:56 PM
George Jones
2 382
Imagine a 2.3 Ly long box. At the middle of the box there's a half silvered mirror (S) which splits laser beam into...
Feb3-14 01:55 PM
Vanadium 50
10 648
Hello all, After a brief break from attempting to learn tensor calculus, I'm once again back at it. Today, I...
Feb3-14 12:46 PM
Nugatory
12 878
For a long time I had basically taken for granted the usual interpretation of one-parameter families of orthogonal...
Feb3-14 12:43 AM
WannabeNewton
4 685
I am writing a paper about SR and GR. I have the following: Special relativity deals with inertial reference...
Feb2-14 06:03 PM
PAllen
27 1,716
As per Maxwell's equations the speed of light is c = 1/√(permeability X permittivity) I find that both...
Feb2-14 04:51 PM
pervect
12 634
https://www.youtube.com/watch?v=Cxqjyl74iu4 If the speed at which light waves propagate in vacuum is independent...
Feb2-14 04:32 AM
ghwellsjr
40 1,884
When I look at a minkowski diagram for a black hole I can see that time goes to infinity for the outside observer...
Feb2-14 02:55 AM
dyb
11 527
I have been learning that gravity has a negative energy associated with it. I've heard this stated a couple different...
Feb2-14 01:19 AM
pervect
13 789
Hi In the Schwarzchild metric, the proper time is given by c^{2}dτ^{2} = (1- \frac{2\Phi}{c^2})c^2 dt^2 - r^2 dθ^2...
Feb1-14 09:42 PM
waitedavid137
10 574
Pretty straight-forward, I'm just curious. My current level and understanding of physics has lead me to believe that...
Feb1-14 05:21 PM
Drakkith
9 824
Hi, could anyone help me out? The FLRW metric in spherical coordinates is: \;\; ds2 = dt2 - a(t)2(dr2 +...
Feb1-14 04:53 PM
Mordred
36 1,262
Hi, I noticed this topic already being discussed but didn't want to hijack the thread with a different question. I...
Feb1-14 02:36 PM
rede96
14 714
Well I am not sure if this thread belongs here or in mathematics/groups but since it also has to do with physics, I...
Feb1-14 02:32 PM
BruceW
4 381
Hi guys... I was wondering if anyone have a sort of a summary of sign conventions in general relativity books. By...
Feb1-14 12:25 PM
Nabigh R
7 543
As it's known, one of the most fundamental aspects of relativity is that all motion is relative. But when we apply...
Feb1-14 10:47 AM
ghwellsjr
52 3,595
Upon discovering the Starship Titanic while doing some research about time travel, I was wondering what joules would...
Feb1-14 08:00 AM
waitedavid137
7 505

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