Shock-avoiding slicing conditions: Tests and calibrations

While the $1+\mathrm{log}$ slicing condition has been extremely successful in numerous numerical relativity simulations, it is also known to develop ``gauge shocks'' some examples. Alternative ``shock-avoiding'' conditions suggested by Alcubierre prevent these pathologies those examples, but have not yet explored and tested very broadly. In this paper we compare performance of shock-avoiding with 1+log for a number ``text-book'' problems, including black holes relativistic stars. While, feature unusual properties lead more dynamics'' than condition, find that they perform quite similarly terms stability accuracy, hence provide viable alternative slicing.