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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
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 41,025
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Feb23-13 08:40 AM
ZapperZ
1 41,393
I wonder why Klauza-Klein theory was discarded. According to the article: www.weylmann.com/kaluza.pdf this model...
Jan24-11 05:00 PM
JesseM
3 1,508
Hello According to general theory is there any explanation of tidal wave in sea due to gravitation of moon. How moon...
Jan25-11 10:30 PM
varuncsed1
4 2,948
In CM there is this equation of motion for ciruclar orbits: F=k/r^2=m*v^2/r, where k depends on the force involved. ...
Jan26-11 07:33 AM
upurg
10 1,621
My thinking has been that a photon, in its own F of R, in a vacuum, travels through space, but not through time. This...
Jan26-11 09:13 AM
D H
17 3,019
i am wondering when i read about planets or solar systems that are like 1million lightyears away, those that take into...
Jan26-11 12:25 PM
HallsofIvy
6 2,071
Hey there is something that I don't really understand In Landau Lifgarbagez"Classical Theory of Fields" it is...
Jan26-11 04:28 PM
bcrowell
1 2,312
Below is a spacetime diagram which depicts the movement of a rod, four units long, relative to another rod of equal...
Jan26-11 09:08 PM
bobc2
71 9,170
Your friend flies from Los Angeles to New York. She carries an accurate stopwatch with her to measure the flight time....
Jan27-11 10:24 PM
RagincajunLA
2 907
Hi, I would like to ask for such a theoretical case: spacecraft moves in space and time and should be curved...
Jan28-11 06:19 AM
jaiii
8 894
Does empty space move? What are the laws that govern its motion? The big-bang set the universe expanding. But...
Jan28-11 09:32 AM
nismaratwork
20 1,894
Introduction Special relativity in the most simple of definitions holds that each inertial frame of reference can be...
Jan28-11 12:40 PM
DaleSpam
18 1,647
Someone told me that spacetime is a matter. I know that matter must be a mass or energy. Is spacetime a matter (mass...
Jan28-11 08:03 PM
qsa
6 1,174
According to general relativity matter warps space and time and result is gravity, but how matter warps space and...
Jan28-11 08:12 PM
DaleSpam
10 918
Hi I am not a physicist (just a biophysicist) but I am in great need of (if possible) a video of Alain Connes's talk...
Jan28-11 08:58 PM
trosenba
0 598
Why is it that the relativity of simultaneity isn't used to explain wave/particle duality? RoS requires that...
Jan29-11 03:31 AM
Phrak
8 2,158
How to change the curvature of space-time around a very powerful laser beam?
Jan29-11 05:31 AM
DaleSpam
7 914
I understand the principle of equivalence (e.g. thought-experiments with lifts etc), but how come that from it one can...
Jan29-11 06:17 AM
Mueiz
140 10,229
According to theory of relativity there is no absolute standard of rest. Now, if Alice and Bob are two observers...
Jan29-11 11:39 AM
DaleSpam
7 1,138
Hi, I'm a first time poster and wanted to share a thought I had concerning disproving time dilation. It is said...
Jan29-11 04:24 PM
DaleSpam
4 4,203
Hey guys, I'm new here. In fact I'm new to the site. Anyway, I just need this question answered. Is it possible to...
Jan29-11 08:05 PM
jtbell
1 835
Is it possible to explain, in one or two paragraphs, what the scalar curvature, R, is as it applies to General...
Jan30-11 11:06 AM
bcrowell
6 1,587
Hi Guys, As I was wondering to the train station the other day I was thinking about gravity bends time and how...
Jan30-11 11:14 AM
bcrowell
2 852
Two people leave from parallel points in space and head to other parallel points the same distance apart. Person 1...
Jan30-11 01:05 PM
yuiop
7 1,992
I am trying to understand the calculations for a relativisitic light clock and am doing something wrong. I am the...
Jan30-11 09:50 PM
liometopum
2 838
Hi, I have been playing around with some figures in a spreadsheet linked to the Schwarzschild metric and the...
Jan31-11 06:35 AM
DaleSpam
19 2,823
I read an article about super massive black holes that are millions a billion times larger than our sun. In reading...
Jan31-11 06:59 AM
DaleSpam
4 1,201
One reference frame A uses a force F on another reference frame B. Both A and B counts the time it takes before A...
Jan31-11 11:27 AM
jason12345
5 2,356
Hi. Currently I am self-studying a book on general relativity (Introducing Einstein's Relativity by Ray D'Inverno), I...
Jan31-11 08:24 PM
purakanui
7 2,021
"During October, 1971, four cesium atomic beam clocks were flown on regularly scheduled commercial jet flights around...
Jan31-11 08:31 PM
yano108
6 2,383
According to SR relativity of simultaneity, the temporal order of events depends on the frame of reference from which...
Feb1-11 04:11 AM
TrickyDicky
2 1,113
Einstein wrote in his book The Meaning of Relativity of 1921 p48 when deriving Field Equations : " We must next...
Feb1-11 05:49 AM
Mueiz
70 8,304
According to special relativity, Would a tachyon's time be imaginary? I saw somewhere that they move backwards in...
Feb1-11 08:04 AM
JesseM
2 1,288
As I have heard that light bends under the gravitational force. While according to formula "w=mg", gravitation acts on...
Feb1-11 09:57 AM
shayaan_musta
2 2,932
Many people have difficulties to understand how time dilation can be consistent with he special relativity principle:...
Feb1-11 11:40 AM
Erland
0 2,207
Hi, I am looking for the formula that describes the gravitational redshift as frequency2 = function(frequency1,...
Feb1-11 02:49 PM
birulami
2 765
Is it possible to go faster than the speed of light? And why do some scientists say you can't??? Thanks -_-!
Feb1-11 05:25 PM
DrGreg
105 10,095
I Have a problem understanding that vanishing of the curvature tensor implies that paralel transport is independent of...
Feb2-11 02:26 PM
Phrak
21 1,976
I have another problem that I am stuck on. Show that a timelike vector cannot be orthogonal to a null vector. ...
Feb2-11 05:05 PM
purakanui
2 3,047
It is well known that the shape of soap bubbles is spherical because of the fact that a sphere is the least-area way...
Feb3-11 01:00 AM
GrayGhost
6 990
I have been doing some study on the theory of relativity and it has got me thinking. We say that the Earth revolves...
Feb3-11 07:14 AM
D H
8 2,095

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