[Users] Einstein Toolkit 2012 Paper NS gravitational collapse example

[Roland Haas]

Hello Vassilios,

> the plot shows the evolution up to a time of roughly 180 (in M_sun)...my
> first question is: for how long in total was the simulation running? for
> how much longer is the evolution stable AFTER the BH has been formed? does
> the code eventually crash or was there only interest in showing
> the successful collapse and then stop the simulation manually after that
> point?
I ran the NS collapse run for the paper.
Mostly there was only interest in getting the collapse. The code fails
shortly after that though (with NaNs inside the AH I think is what it was).

> furthermore, in the tov_collapse_vc_l3.par file for the collapse for the
> paper there the following parameters for a thorn *corecollapsecontrol* the
> following section:
These have to go. I'll put up a replacement that uses public thorns
(CoreCollapseControl is not yet public [though there are no objections
to making it public from the author]).

> what is this *corecollpasecontrol* thorn doing? and where can it be
> obtained if it is necessary for successful simulations of NS to BH collapse?
It does many things but we only really need functionality to steer some
grid functions.

I attach an updated parameter file which uses Frank Loeffler's Trigger
thorn (https://docs.einsteintoolkit.org/et-docs/Thorns_we_know_of).
Please let me know if this solves your problem (I only tested that I can
start it), then I can (barring protests from the other authors), update
the parameter file in the repository.

Yours,
Roland

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