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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 42,765
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 42,406
i know those type of question are posted every day but it is short: one twin is on a spaceship and the other on a...
Jul19-06 07:09 PM
yogi
16 1,732
Is it justified to state that GR is "just" a geometrical theory to calculate the paths of objects in spacetime? ...
Jul17-06 06:49 PM
pervect
3 1,732
Given a metric of the form ds^2 = A(r) dt^2 + B(r) dr^2 + C(r)^2 (d\theta^2+sin^2\theta d\phi^2 + sin^2\theta...
Nov26-10 02:54 PM
pervect
3 1,732
I'd be very happy if you'd answer this, and I'm looking more for the effect of gravity on time, rather than speed.
Apr24-05 01:29 PM
Mortimer
5 1,731
I can't understand how the D'Alembertian x 4-vector Vector potential = mu x 4-vector J Have ...
Mar30-07 05:00 PM
Thrice
2 1,731
Although I do have a degree in chemical engineering, I am studying relativity/cosmology on a beginning level just as a...
Feb4-12 12:20 PM
Nugatory
10 1,731
Why is it that when describing time dilation, we say that the object (the thing observed) slows down relative to the...
Dec16-12 06:04 AM
ghwellsjr
20 1,731
Yes, general relativity is out of my depths for now. Now I've often seen drawings of a gravitational source...
Dec24-07 02:14 AM
pervect
2 1,730
I was wondering if anyone had an explicit form of the hamilton-jacobi equations for GR. I had a little attempt myself...
Jan29-08 11:16 PM
shoehorn
1 1,730
I have recently attempted quantifying relativity of simultaneity and I was wondering if my attempt has been...
Jul12-12 03:31 AM
harrylin
13 1,730
Hi everyone, I am looking into relativity as preparation for university and I was wondering if anyone could help me...
Aug13-11 07:01 AM
jimbobian
4 1,730
I have a question concerning the treatment of black holes in General Relativity. As I understand it, the force of...
Dec8-03 09:48 AM
Ambitwistor
9 1,729
Do you think that the involvement of photons in the derivation of the fundamental equations of relativistic dynamics...
Feb13-06 07:48 AM
jtbell
4 1,729
Will the image of an object inside a gravitational lens, though on the side of the lens that is facing us, be...
Dec22-06 08:40 PM
Chris Hillman
7 1,729
How do we formulate the two body problem in Gr. Also if possible how do we solve it, or approximate said solution?
Jul8-07 12:03 PM
pervect
5 1,729
I've read that in GR, gravity isn't considered to be a force, or that it's considered to be a fictitious force because...
Sep13-07 02:08 AM
rcgldr
5 1,729
The gravitational force is zero at the center of a planet, but the GPE is at a peak minimum (most negative). What...
Apr7-09 10:21 AM
rcgldr
4 1,729
Hi, What are the weaknesses of Einstein's GR ? Why people are trying to construct GR from field theoretical point...
Oct8-09 05:27 PM
Naty1
10 1,729
When you are in a box it is difficult to know the difference between if the box is accelerating in space or you are...
Feb22-10 09:10 PM
gonegahgah
18 1,729
is it correct to state that all the clocks of a given inertial reference frame, synchronized in accordance with...
Jul25-06 02:43 PM
Robert.Hipple
2 1,728
Einstein v. Wheeler's Black Holes John Wheeler who died earlier this month (13 April) not only coined the term ...
Apr25-08 05:32 AM
pmb_phy
3 1,728
I am having problems with this presentation of the train thought experiment. I actually think it's incorrect, but I'm...
May2-10 11:54 AM
Jerbearrrrrr
2 1,728
Suppose I hold a pencil by its tip and turn it around 20, around the axis which goes through the pencil's length. The...
Nov3-10 09:12 AM
ghwellsjr
16 1,728
Hi, I've heard it said that for Schwarzschild spacetimes, then the coordinate 'r' is an affine parameter for radial...
Feb6-11 04:07 AM
LAHLH
8 1,728
After recently seeing Brian Greene's "Elegant Universe," I was struck by an idea - maybe not an original idea, but an...
Dec6-03 03:53 PM
Ambitwistor
1 1,727
two identical ships launch on parallel paths r distance apart. the are completely alone ]. once they reach some...
Apr4-11 11:46 PM
ghwellsjr
9 1,727
Hi there, Physics lovers!! I've got some questions for you!! Denoting by (1)...
Apr21-11 01:37 AM
MManuel Abad
2 1,727
I'm trying to use the equations on this page and I have solved the following. Is it correct? ...
Aug4-11 03:54 AM
randombill
1 1,727
Curious Why does the equivalence of mass/energy involve the speed of light at all? Is it because Einstein...
Jan19-12 05:30 PM
Necrostate
13 1,727
Hello, I would be interrested in building a list of things moving close to the speed of light. This list would...
May8-12 01:43 PM
lalbatros
14 1,727
Forgive me if I'm being naive or if this has been answered before, but, I was wondering if someone can explain to me...
May2-09 04:02 AM
JesseM
8 1,726
hi............ In the twin paradox, we consider that one of the twins went out of the surface of earth...
Nov28-11 12:24 PM
tom.stoer
12 1,726
If someone leaves on a spaceship from Earth at near the speed of light, the clock on the spaceship will appear be...
Dec12-03 09:58 AM
DW
3 1,725
Say we have 2 bodies of m1 , m2 . The distance between them is a) r1 Ma=m1+m2 b) r2>r1 Mb=m1 +m2 In...
Sep14-07 09:37 PM
pervect
2 1,725
A.A.Logunov, M.A.Mestvirishvili, Yu.V.Chugreev THE EQUIVALENCE PRINCIPLE...
Jan29-08 01:52 AM
J.F.
0 1,725
I was just re-reading some of Hawking's writings, and apparently he is fairly stong supporter of a quantum theory of...
Oct10-09 11:44 AM
Jonathan Scott
11 1,725
The subject of time dilations has always fascinated me. Sometimes the thought experiments can get confusing but there...
Nov10-11 08:11 PM
nhmllr
4 1,725
I had 1 year ago a little discussion with DaleSpam about the short Lorentz derivation (triangle) if a photon alone...
Apr16-13 06:38 PM
digi99
16 1,725
So my physics teacher has been trying to explain magnetic forces in terms of electric forces and relativity but I'm...
Mar25-12 09:40 AM
Naty1
5 1,724
Hello All I'm new to the forum and have a question. I was looking at the time dilation function and noticed that...
Aug11-11 05:14 PM
Ossama
9 1,723

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