  We study the effective transfer matrix within the semiclassical and
bifurcation phases of CDT quantum gravity. We find that for sufficiently large
lattice volumes the kinetic term of the effective transfer matrix has a
different sign in each of the two phases. We argue that this sign change can be
viewed as a Wick rotation of the metric. We discuss the likely microscopic
mechanism responsible for the bifurcation phase transition, and propose an
order parameter that can potentially be used to determine the precise location
and order of the transition. Using the effective transfer matrix we
approximately locate the position of the bifurcation transition in some region
of coupling constant space, allowing us to present an updated version of the
CDT phase diagram.
