Search All of the Math Forum:
Views expressed in these public forums are not endorsed by
NCTM or The Math Forum.


Math Forum
»
Discussions
»
sci.math.*
»
sci.math
Notice: We are no longer accepting new posts, but the forums will continue to be readable.
Topic:
Spoonfeeding Field Equations
Replies:
6
Last Post:
Feb 20, 2013 2:03 AM




Re: Spoonfeeding Field Equations
Posted:
Feb 20, 2013 2:03 AM


On Feb 19, 1:18 pm, Giovano di Bacco <gdb...@gmail.com> wrote: > Koobee Wublee wrote:
> > In a 4x4 matrix, there are 16 elements, and each element forms a > > differential equation. If you think time and space are allowed to > > intertwine, then there are 16 equations. If not, there are only 10 > > equations. However, due to natural symmetry, they reduce down to 10 and > > 7 equations respectively. Furthermore, if you only allow diagonal > > metric, then there are only 4 equations. Finally, if the spherically > > symmetric polar coordinate system is employed, that reduces further into > > just 3 equations. Solving these 3 equations is a challenging and > > daunting task. Imagine doing so with 16 equations. <shrug> > > i am total confuses, how do i know what to intertwine, ahmmm???
Good question. There remains no proof that time and space can be intertwined according to the general equation describing the spacetime geometry since all practical applications call out for the diagonal metric which says time and space do not intertwine. <shrug>
> what happens in nature does not depend on my intertwine;
What is that again? <shrug>
> 16 or 3 equations does not really matter, since i feed them numerically > into a computer anyway, also symbolic, let the computer do the dirty job
These solutions all predict Newtonian results when the curvature of spacetime is weak. What separate them apart are the extreme boundary conditions. For example, the Schwarzschild metric manifests black holes. <shrug>
> > Finally, there are infinite solutions in which the Schwarzschild metric > > is one of them. The Schwarzschild metric was derived by Hilbert. A > > year or two before that in early 1916, Schwarzschild derived a solution > > that does not manifest black holes. <shrug> > > how many metrics are there anyway??
An infinite of them that satisfy Newtonian law of gravity at weak curvature in spacetime. However, each one predicts drastically different manifestations at extrem conditions. <shrug>
> and i suppose the Schwarzschild solution must be right
Assumptions are mostly wrong. You need experimental verifications. <shrug>
> since an attempt to modelled a blackhole would > crash a computer
Either you have an outdated computer in hardware or inept programmers that have developed the software. <shrug>
> have you a homepage with these equations in a readable form?
Sorry no  not yet. What Koobee Wublee has given you you can write down these differential equations to explore if the Schwarzschild metric is indeed a solution or not and what other solutions are out there. Oh, @/@x means partial derivative with respect to x. <shrug>
Hope this helps. <shrug>
Oh, by the way, why are you filtering out the newsgroups when replying? Are you one of these Einstein Dingleberries with familiar past who is trying to learn more about GR where piles of textbooks you are sitting on do not give any comfortable closures? Yes, they are all written to mystify and proliferating the bullshit in order for the selfstyled physicists to maintain their elite priesthood in status quo. <shrug>
However, it is comforting to see an exEinsteinDingleberry able to learn about the truth. <shrug>



