[Cosmo-torun] cosmo workshop Fri 2 March @15.00 @KRA: Jan Ostrowski on Cactus: numerical relativity

[Tomasz Kazimierczak]

hello cosmo-torun

Could we start a little bit ealier,
for example @14:00?

I have "dyżur" at control room starting at 16:00.

2012/2/29 Boud Roukema <boud w astro.uni.torun.pl>

> hi cosmo-torun
>
>  Cactus: numerical relativity
>  cosmo workshop Fri 2 March @15.00 @KRA
>  Jan Ostrowski
>
>
> Jan is doing very interesting work in finding out how to do numerical
> relativity. One way of saying it is the following:
>
> "Normal" cosmological N-body simulations consist of *Newtonian*
> gravity simulated on a highly simplified (perfectly homogeneous)
> relativistic "background". In formal scientific language, this is
> called a "heuristic" approach; in informal language, it's called "a
> fudge" - it's a mathematical shortcut that seems like it should work
> and lets us quickly compare some sort of "model" to observations
> instead of waiting 50 years for the mathematics to be solved. In
> principle, every scientist using the heuristic/fudge is aware of
> this. Pure theory is very difficult to apply to the real world.
>
> Relativistic cosmological simulations should be "directly"
> relativistic, consistent with the Einstein equations, without using
> the heuristic/fudge of adding "perturbations" that obey Newtonian
> gravity to a relativistic "background". So these simulations can be called
> "background-free".
>
> How can we do background-free cosmology simulations?
>
> Jan will present a discussion on this.
>
> pozdr
> boud
>
> ______________________________**_________________
> Cosmo-torun mailing list
> Cosmo-torun w cosmo.torun.pl
> http://cosmo.torun.pl/mailman/**listinfo/cosmo-torun<http://cosmo.torun.pl/mailman/listinfo/cosmo-torun>
>
-------------- następna część ---------
Załącznik HTML został usunięty...
URL:  <http://cosmo.torun.pl/pipermail/cosmo-torun/attachments/20120229/6eec562b/attachment.html>