Space-time Definition and 419 Threads

Things would need to have 'mass' in order to have inertia and be defined somewhere in space-time? If 'charges' did not have mass where would they exist (relative to each other)? More mass = more inertia (harder to change position). Order the position of charges with mass to allow them to...

I am trying to understand how Space and time Relate with Gravity. In Physics class i saw a video showing planets Rolling around on a grid with the sun Making the deepest indentation and planets making smaller ones. Now I can but help thinking that this didnt give me the full picture .. Is it on...

Dark energy is space and its interaction with vacuum particles is space-time. Matter affects dark energy and vacuum particles to curve space-time. Anyone agree?

I was reading the lectures compiled in "Six not-so-easy pieces" by the great Feynman. He was trying to explain the curvature of space(and subsequently space-time) through varying temperatures on a hot plate. Much like the curve of a sphere. Anyways I'm going to assume most of your are familiar...

Hi all, I was wondering if anyone of you has read the book of Laurent Nottale Fractal Space-Time and Microphysics: Towards a Theory of Scale Relativity why is not his approach adopted ?- as apparently, he extended the principle of relativity to scales and thus proposes a unifying...

Since every particle from photon to proton delivers energy when it interacts, then doesn't this energy distort space-time by its energy?

[PLAIN]www.ras.org.uk/html/meetings/2001/010309.html[/URL] :confused: :rolleyes:

Hello all, I seem to be misunderstanding a concept; perhaps someone could point me in the right direction. My knowledge of physics is very basic so please have some sympathy. Thanks General relativity shows that gravity is caused by the presence of matter that curves space-time. But now I...

According to Einstein's theory of general relativity, gravity bends or warps space-time. this is because the gravitons, or gravity waves, contain no mass and therefore exert their force over large distances with infinite speed. in other words, light from a star that passes by a large body, like...

Did Einstein meant by space-time continuous that time is just another dimension, like the other 3? If so, why are we experiencing this one that differently? (Should this have gone in the phylosophy section?)

I have seen a derivation of the dependence of the speed of light inside a Schwarzschild space-time: c depends on the radial position (r), but a light ray which moves radially has a different dependence on r as a light ray which moves tangentially. My question is whether such an effect may be...

What is space-time "made out of"? A thread in another forum about the definition of "nothing" got me thinking. I know matter is composed of molecules, which are composed of atoms, which are composed of electrons, neutrons and protons, which are composed of quarks, etc ... But what about...

I think that if space time was discrete we wouldn,t have divergences or other anomalies...but can it be?..and if so how it should be treated?...

-at small scales and taking into account the uncertainty principle..could we make the stament that space-time exist?..if so how it would be at a quantum scale what is the equivalence to geodesics and Rienmann tensor in quantum mechanics..?..

Is the value of Pi related to the curvature of space-time? Is it the value that it is because space-time is more or less flat? If the universe were of a greater open or closed curve, would Pi be a different value? Thanks, Glenn

i have looked on the net but i can not find a site that explains the MECHANICS of gravity wave production, as i understand it is an oscillation in space time, if gravity is warped space time how can the destruction of a massive body make it oscilate, it implies some sort of bounce, but how...

While reading an article on time travel I came across a section titled 'Is Time an Illusion?'. Immediately I was drawn to a conversation I shared with a good friend of mine a few months prior. We had been talking all night about different subjects that are unexplained but interested us to look...

Ok I'm new here and I'm trying to get on my feet so I hope that this is the right forum to post this in. Anyway, Einstein supposedly proved that there was no force of gravity, that it could be subsituted with accelaration, and that gravity is made by bent space time. I have quite a few...

I came across this article: http://www.spacedaily.com/news/cosmology-03i.html Thoughts?