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

Dec3107 02:06 AM
jtbell

0 
40,946 
Before posting anything, please review the Physics Forums Global Guidelines.
If you are seeking help with a...

Feb2313 08:40 AM
ZapperZ

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41,319 
Subject: A Baffling Quote from Einstein, badly requiring explanation
All sources I've consulted indicate that...

Mar2509 10:14 PM
feynmann

59 
5,181 
I have very little knowledge in general relativity, though I do have a decent understanding of
the theory of special...

Mar1012 08:11 AM
Chestermiller

3 
1,124 
Hello,
It is my understanding that in the case of two observers (A and B) passing each other at high speeds that due...

Feb1714 03:11 AM
Nugatory

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303 
Dear all,
First, please forgive my english, I am French.
In most textbooks on general relativity (GR) the non...

Apr1810 07:16 PM
halcon

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999 
If a train goes past an observer at 100km/hour and someone on the train fires a bullet from a gun in the direction the...

Aug2210 07:45 AM
jtbell

16 
1,823 
The line element in a rotating plane, with angular velocity \omega is given,
in polar coordinates (t, r, \theta) by (...

Apr908 02:31 AM
Ich

10 
2,440 
The laws determinning the passage of light through varying densities of transparent material and through varying...

Aug2405 05:13 PM
Phobos

6 
1,641 
If we have EinsteinHilbert Lagrangian so:
\mathcal L = (g)^{1/2}R for R Ricci scalar (¿?) then my question...

Jan1007 02:50 PM
Chris Hillman

1 
1,759 
I have a doubt regarding the speed of light. What makes it impossible to achieve it. Why cant we have a relative...

Aug110 05:39 PM
DaleSpam

12 
1,295 
If two stars, both slightly above their Schwarzschild radius collide, can a joint horizon form before they come in...

May213 09:20 AM
Bill_K

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982 
Suppose I dive head first into a black hole of size 100 light second from far away. When I reckon that I will cross...

Nov906 11:53 PM
wywong

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1,402 
Hello
An old friend of mine just came to me in the early morning and asked about a book on GR and how it manages...

Mar2910 04:38 PM
Altabeh

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466 
Hello all. First time posting here.
I have a basic understanding of special relativity and I have few questions...

Dec2009 05:01 AM
yuiop

16 
3,444 
A bus travels at a very high speed. It's time slows down.
What's the mechanism by which this happens?
Any help...

Sep1111 06:52 AM
HallsofIvy

4 
1,626 
Consider a light clock, i.e. two ideal mirrors, mounted in parallel with a vacuum in between, such that, in principle,...

Jan511 03:47 PM
birulami

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984 
You are an observer fixed in absolute space watching clocks pass between two points, A and B, separated by 1km. The...

Feb2406 08:50 PM
clj4

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2,200 
http://i209.photobucket.com/albums/bb185/BobC_03/Block_Universe_1.jpg...

Dec3111 09:02 PM
George Jones

85 
8,878 
I push a ball on the ground and it comes to rest after some time.
It is a case of motion turning into rest.
I...

Jul813 02:25 PM
DaleSpam

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885 
There are several measures of distance for a free falling observer in a Schwarzschild solution.
I think it would be...

Nov611 12:22 PM
Passionflower

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524 
Okay, so the title is overly dramatic, but I couldn't think of anything else to call this. Not trying to actually...

May2010 11:35 PM
Passionflower

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2,628 
Hello All,
in 4space, the position is x=(x0,x1,x2,x3), where x0=ct
The question is 
Can one define the clock...

May412 03:56 AM
GeorgeDishman

10 
1,376 
If I am understand correctly a moving mass has more energy than a stationary mass. Mass and energy are two forms of...

May314 11:44 AM
PeterDonis

4 
373 
I was wondering what book would be useful in learning special relativity and basic general relativity. I know vector...

Mar1907 06:12 AM
Demystifier

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3,698 
My textbook says that a compressed spring has more mass than when it is not compressed. I'm assuming that this is...

Mar1712 02:01 PM
bobsmith76

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6,005 
Over time, I've realized there are certain limits to how far the human imagination can go. Even for simple things, it...

Mar708 05:39 PM
Gear300

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2,846 
Can someone explain to me how those who believe relativity also believe that the earth revovles around the sun. I...

May309 05:13 PM
Modman

19 
2,101 
Hey everyone, for anyone who saw my thread in the chemistry section you know I'm changing my view point to that of the...

Jan2614 05:45 AM
llynne

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478 
In another thread (on OppenheimerSnyder collapse), I posted a link to some lecture notes on gravitational collapse....

Nov1612 06:48 PM
PAllen

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761 
Hi all, I'm in a modern physics course and am surprised by how confused I am about special relativity. I know...

Oct912 01:17 AM
ghwellsjr

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1,186 
Suppose two people, each in his own craft, set apart by significant distance and stationary to each other. Both...

May513 08:26 AM
Doc Al

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455 
Could it be possible that spacetime curvature is not caused by matter but is an inherent characteristic of...

Jun1211 07:37 AM
Grieverheart

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619 
Mike Fontenot has a scheme he calls CADO for Current Age of a Distant Object. He has presented some of his ideas in...

May311 08:30 AM
JesseM

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4,630 
Hi
For some days I was looking for the reason that relativity said the speed of light is the maximum speed.At last...

Jun709 02:54 PM
DrGreg

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1,858 
This looks interesting:
"Symmetry groups are undeniably basic but why must spacetime have a group structure? The...

Jan2505 12:07 PM
Project

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2,359 
http://p13.freep.cn/p.aspx?u=v20_p1_photo_1105250239256753_0.jpg
I have worked on this for whole morning, but...

May2411 01:43 PM
Junjie

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608 
I'm sure someone else must have come up with this (the description in the third paragraph), but I haven't seen it....

Nov1510 06:40 PM
DaleSpam

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882 
A deviation from General Relativity?
Reference:
A weak lensing detection of a deviation from General Relativity on...

Oct2709 09:36 AM
Wallace

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1,307 
We know that a free scalar field on a diffinvariant 1+1 dimensional background (i.e. bosonic string theory on the...

Mar613 03:22 PM
quelarion

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456 
I have written a report on the Schwarzschild Metric, where I derive a version of it that I have never seen before in...

Jun509 08:40 PM
DiamondGeezer

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1,513 
{F}=\frac {{\gamma}^3 {m} {v}^2}{{c}^2} + \gamma {m} {a}
You all know this equation.Relativistic newton's second...

Apr711 09:27 AM
Bill_K

2 
541 