[Users] Add a lapse condition

[Erik Rodrígo Jiménez Vázquez]

 Dear all

Is there a way to add different gauge conditions for the lapse? I'm trying
to add a gauge shock avoid lapse for the Bona-Masso family of slicing
conditions

dot alpha = -alpha^2 f(alpha) K

with f(alpha)=1+constant/alpha^2

I don't know if I should add a thorn that complements the McLachlan thorn,
or what is the correct procedure to implement the gauge condition?
Furthermore, this kind of gauge condition allows to the lapse become
negative which I know is a serious drawback when the lapse collapses to
zero, however I want to do some numerical experiments with this kind of
lapse.

Any help is very welcome. Thanks
Erik
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.einsteintoolkit.org/pipermail/users/attachments/20191024/7dfb12d4/attachment.html