[Cosmo-torun] @14:00 @KRA OK? [Re: cosmo workshop Fri 2 March @15.00 @KRA: Jan Ostrowski on Cactus: numerical relativity]

[Boud Roukema]

hi everyone,

On Wed, 29 Feb 2012, Tomasz Kazimierczak wrote:

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

Does anyone (especially Jan!) have a problem with starting at 14:00 ?

See everyone this afternoon :)

pozdr
boud


> 
> 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
>
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> 
> 
>