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<div>Dear all</div><div><br></div><div>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</div><div><br></div><div>dot alpha = -alpha^2 f(alpha) K</div><div><br></div><div>with f(alpha)=1+constant/alpha^2</div><div><br>
</div><div>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.</div><div><br></div><div>
<span><span> Any help is very welcome. Thanks</span></span>
</div><div>Erik<br></div><div><br></div>
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