  The HMC algorithm, combining the advantages of molecular dynamics and
Monte-Carlo methods, is the most efficient algorithm to simulate QCD including
the effects of sea quarks. In the standard approach momentum fields are
generated with a Gaussian probability density. In this work I will explore
another possibility. By using a Lorentz distribution one can dynamically impose
a cutoff in the rate of change of the coordinates that potentially could have a
better behavior. I will present some results in pure SU(2) gauge theory.
