  We report preliminary results on the finite temperature behavior of SU(4)
gauge theory with dynamical quarks in both the fundamental and two-index
antisymmetric representations. This system is a candidate to present scale
separation behavior, where fermions in different representations condense at
different temperature or coupling scales. Our simulations, however, reveal a
single finite-temperature phase transition at which both representations
deconfine and exhibit chiral restoration. It appears to be strongly first
order. We compare our results to previous single-representation simulations. We
also describe a Pisarski-Wilczek stability analysis, which suggests that the
transition should be first order.
