
The section of the Usenet Physics FAQ titled "Experimental Basis of Special Relativity" has been cited here many...

Dec3107 02:06 AM
jtbell

0 
42,141 
Before posting anything, please review the Physics Forums Global Guidelines.
If you are seeking help with a...

Feb2313 08:40 AM
ZapperZ

1 
42,487 
I wonder why KlauzaKlein theory was discarded. According to the article:
www.weylmann.com/kaluza.pdf
this model...

Jan2411 05:00 PM
JesseM

3 
1,536 
Hello
According to general theory is there any explanation of tidal wave in sea due to gravitation of moon.
How moon...

Jan2511 10:30 PM
varuncsed1

4 
2,988 
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.
...

Jan2611 07:33 AM
upurg

10 
1,647 
My thinking has been that a photon, in its own F of R, in a vacuum, travels through space, but not through time. This...

Jan2611 09:13 AM
D H

17 
3,092 
i am wondering when i read about planets or solar systems that are like 1million lightyears away, those that take into...

Jan2611 12:25 PM
HallsofIvy

6 
2,098 
Hey
there is something that I don't really understand
In Landau Lifgarbagez"Classical Theory of Fields" it is...

Jan2611 04:28 PM
bcrowell

1 
2,330 
Below is a spacetime diagram which depicts the movement of a rod, four units long, relative to another rod of equal...

Jan2611 09:08 PM
bobc2

71 
9,345 
Your friend flies from Los Angeles to New York. She carries an accurate stopwatch with her to measure the flight time....

Jan2711 10:24 PM
RagincajunLA

2 
917 
Hi,
I would like to ask for such a theoretical case:
spacecraft moves in space and time and should be curved...

Jan2811 06:19 AM
jaiii

8 
912 
Does empty space move? What are the laws that govern its motion?
The bigbang set the universe expanding. But...

Jan2811 09:32 AM
nismaratwork

20 
1,927 
Introduction
Special relativity in the most simple of definitions holds that each inertial frame of reference can be...

Jan2811 12:40 PM
DaleSpam

18 
1,686 
Someone told me that spacetime is a matter. I know that matter must be a mass or energy. Is spacetime a matter (mass...

Jan2811 08:03 PM
qsa

6 
1,195 
According to general relativity matter warps space and time and result is gravity,
but how matter warps space and...

Jan2811 08:12 PM
DaleSpam

10 
929 
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...

Jan2811 08:58 PM
trosenba

0 
613 
Why is it that the relativity of simultaneity isn't used to explain wave/particle duality?
RoS requires that...

Jan2911 03:31 AM
Phrak

8 
2,193 
How to change the curvature of spacetime around a very powerful laser beam?

Jan2911 05:31 AM
DaleSpam

7 
933 
I understand the principle of equivalence (e.g. thoughtexperiments with lifts etc), but how come that from it one can...

Jan2911 06:17 AM
Mueiz

140 
10,452 
According to theory of relativity there is no absolute standard of rest. Now, if Alice and Bob are two observers...

Jan2911 11:39 AM
DaleSpam

7 
1,156 
Hi, I'm a first time poster and wanted to share a thought I had concerning disproving time dilation.
It is said...

Jan2911 04:24 PM
DaleSpam

4 
4,389 
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...

Jan2911 08:05 PM
jtbell

1 
854 
Is it possible to explain, in one or two paragraphs, what the scalar curvature, R, is as it applies to General...

Jan3011 11:06 AM
bcrowell

6 
1,611 
Hi Guys,
As I was wondering to the train station the other day I was thinking about gravity bends time and how...

Jan3011 11:14 AM
bcrowell

2 
864 
Two people leave from parallel points in space and head to other parallel points the same distance apart.
Person 1...

Jan3011 01:05 PM
yuiop

7 
2,065 
I am trying to understand the calculations for a relativisitic light clock and am doing something wrong.
I am the...

Jan3011 09:50 PM
liometopum

2 
857 
Hi,
I have been playing around with some figures in a spreadsheet linked to the Schwarzschild metric and the...

Jan3111 06:35 AM
DaleSpam

19 
2,921 
I read an article about super massive black holes that are millions a billion times larger than our sun. In reading...

Jan3111 06:59 AM
DaleSpam

4 
1,217 
One reference frame A uses a force F on another reference frame B.
Both A and B counts the time it takes before A...

Jan3111 11:27 AM
jason12345

5 
2,421 
Hi. Currently I am selfstudying a book on general relativity (Introducing Einstein's Relativity by Ray D'Inverno), I...

Jan3111 08:24 PM
purakanui

7 
2,061 
"During October, 1971, four cesium atomic beam clocks were flown on regularly scheduled commercial jet flights around...

Jan3111 08:31 PM
yano108

6 
2,419 
According to SR relativity of simultaneity, the temporal order of events depends on the frame of reference from which...

Feb111 04:11 AM
TrickyDicky

2 
1,146 
Einstein wrote in his book The Meaning of Relativity of 1921 p48 when deriving Field Equations :
" We must next...

Feb111 05:49 AM
Mueiz

70 
8,434 
According to special relativity,
Would a tachyon's time be imaginary? I saw somewhere that they move backwards in...

Feb111 08:04 AM
JesseM

2 
1,314 
As I have heard that light bends under the gravitational force. While according to formula "w=mg", gravitation acts on...

Feb111 09:57 AM
shayaan_musta

2 
2,995 
Many people have difficulties to understand how time dilation can be consistent with he special relativity principle:...

Feb111 11:40 AM
Erland

0 
2,268 
Hi,
I am looking for the formula that describes the gravitational redshift as
frequency2 = function(frequency1,...

Feb111 02:49 PM
birulami

2 
777 
Is it possible to go faster than the speed of light? And why do some scientists say you can't???
Thanks _!

Feb111 05:25 PM
DrGreg

105 
10,278 
I Have a problem understanding that vanishing of the curvature tensor implies that paralel transport is independent of...

Feb211 02:26 PM
Phrak

21 
1,995 
I have another problem that I am stuck on.
Show that a timelike vector cannot be orthogonal to a null vector.
...

Feb211 05:05 PM
purakanui

2 
3,091 
It is well known that the shape of soap bubbles is spherical because of the fact that a sphere is the leastarea way...

Feb311 01:00 AM
GrayGhost

6 
1,019 
I have been doing some study on the theory of relativity and it has got me thinking. We say that the Earth revolves...

Feb311 07:14 AM
D H

8 
2,175 