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Feb2313 08:40 AM
ZapperZ

1 
42,494 
The section of the Usenet Physics FAQ titled "Experimental Basis of Special Relativity" has been cited here many...

Dec3107 02:06 AM
jtbell

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I want to study the KaluzaKlain's theory about general relativity in 5 dimensions. Could anyone give me some...

Mar1604 12:09 PM
DW

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Hi Friends,
I am Alen, doing research about light. I have submitted my thesis which contains few finding about...

Apr2413 12:46 AM
Simon Bridge

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Here is another train and platform example, offered to examine ghwellsjr's view equating what you see with what is...

Jan2814 02:34 PM
phyti

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Hello guys!
I've been trying to get some intuition for differential forms. I know the formal theory and I know how...

Jul214 09:26 AM
micromass

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There are 2 people, who are twins. One was born on earth, and the other was born in space. Because earth orbits the...

Aug405 11:33 AM
professor

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hello! days ago I wondered me without finding any answer: if the limit of the speed is c, does exist a limit for...

Aug2006 02:14 PM
pervect

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Hagen Kleinert, in his book, Path Integrals in Quantum Mechanics, Statistics, Polymer Physics, and Financial Markets,...

Dec2711 10:08 PM
friend

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Hi, I have some trouble with Theorem 2.2.1 in Wald's GR book p.15.
He derived formula 2.2.5 by using 2.2.4. Here,...

Jun1412 04:32 AM
syhpehtam

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Hey guys. I have a question regarding exercise 6.5 in MTW ("Radar Distance Indicator"). The exercise asks the...

Jan414 01:12 AM
PeterDonis

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Okay, everyone, I know that this is sounds like a setup question. And that's because it is. But please humor me,...

May2704 11:51 AM
russ_watters

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so according to relativity, gravity is rly curves in space time. I imagine this in a 2d context, with a 2d world...

May505 08:37 PM
michael879

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if a ship is going at half the speed of of light (just imagine okay) and there is a light in the center of the ship...

Nov805 10:05 PM
franznietzsche

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Apologies  I posted this here by mistake, and have reposted it in the Cosmology forum. I don't know how to delete...

Sep606 07:56 AM
oldman

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I'm trying to follow this proof/derivation in Relativity demystified basically the book is showing transformations and...

Jul2609 08:03 PM
Fredrik

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Question: As an object approaches C and its length contracts, does spacetime contract also, causing the a larger...

Mar3010 03:28 PM
brainstorm

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The derivaton I have seen (for a Schwarschild black hole) is this
One imagines a mass m attached to a long (well...

May2710 01:37 AM
yuiop

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Hello, I am newly learning special relativity. I have this particular doubt>
Why is light moving along the...

Nov1411 07:56 PM
Highwaydude

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Is there an easy way to see this? can it be see via the penrose diagram? does it have anything to do with how when a...

Apr312 10:26 PM
George Jones

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As per group property, one could make a product of gr members e.g. Lorentz boost (B) and rotation R, as they...

Oct1812 03:57 AM
TrickyDicky

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Can anyone explain to me what is contravariant and covariant? I just know that they are tensors with specific...

Sep2005 12:24 AM
pervect

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This may sound mind numbingly stupid to those who are seasoned in Physics, but how do we know that it is impossible to...

May1506 03:24 PM
SpaceTiger

4 
1,038 
In the 3+1 formulation of GR we have the following basic variables:
g_{ij} = \textrm{metric on a spatial surface}...

Nov2906 06:12 PM
shoehorn

0 
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Hi,
I'm sorry to have to ask this, but I can't seem to reason this one out by myself at the moment. Given the...

Oct1211 06:45 PM
Sam Gralla

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1,038 
How can a smooth deformation of a Lorentzian manifold possibly create one or more singularities?

Feb107 08:53 PM
quantum123

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We have a light cone
http://img7.imageshack.us/img7/6463/lightcone3.jpg
Vertical and horizontal axis representing...

Jun1709 10:58 AM
tinytim

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This extract is from Bridgman, A Sophisticate's Primer of Relativity. 1962 Page 28. Only the last couple of sentences...

Oct2409 12:00 PM
Cleonis

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I understand that energy depends on mass but why multiply it by C˛ and not some other constant ?
Several...

Jan2812 03:59 PM
Matterwave

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While explaining how science works in my biology class my biology teacher said that relativity had been proved wrong,...

Dec1912 03:19 PM
PeterDonis

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Why doesn't a stationary charge experience a magnetic force? And why does a moving charge produce a magnetic field?...

Sep2113 02:54 AM
eightsquare

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hi everyone. i'm having trouble understanding the concept of proper time in general relativity.
suppose we have...

Feb714 06:04 PM
pervect

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the starship enterprise wishes to fly to a distant galaxy 85 light years away. at what speed would it have to travel...

Jan2405 01:25 AM
hype_chicky

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Hi,
Could you explain me a few things I still don't get about special relativity ?
I've been tought a few years...

Jan309 12:57 PM
JesseM

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Hi,
I hope my questions make sense at all:
Is it possible to define a nonlinear Operator such that letting this...

Jun3009 02:04 PM
Orbb

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http://arxiv.org/abs/mathph/0105043
And published in a decent peerreview journal, so don't let the title fool you...

Feb2610 03:23 PM
JustinLevy

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Hello, this is my first post here and I'm sorry if I say a dumb thing. Something is bothering me for a long time... I...

Aug1110 08:40 AM
ZapperZ

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I like to try and derive little things by myself if I think it is manageable. One such thing is the addition of...

Dec1511 11:58 PM
nhmllr

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Imagine Batman has a new hyper speed Batship that is the shape of his circular bat emblem. The ground has convenient...

Apr1912 10:40 AM
Adel Makram

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What do people think of Nikodem Poplawski's proposal that adding torsion to GR (in the form of ECSK gravity) leads to,...

Dec812 02:32 PM
shantu

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The Schwarzschild Solution to Einstein's Field Equations for gravity are said to be exact when outside a spherically...

Sep1309 04:02 PM
atyy

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In my cosmology lectures they say that a negative curvature gives an infinite space but I was thinking what about the...

Feb1910 07:06 AM
George Jones

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1,036 