  We present a suggestion on the interpretation of canonical time evolution
when gravitation is present, based on the nonlinear gauge approach to gravity.
Essentially, our proposal consists of an internal-time concept, with the time
variable taken from the dynamical fields characteristic of the nonlinear
realization of the internal time-translational symmetry. Physical time
evolution requires the latter symmetry to be broken. After disregarding other
breaking mechanisms, we appeal to the Jordan-Brans-Dicke action, conveniently
interpreted, to achieve that goal. We show that nontrivial time evolution
follows, the special relativistic limit being recovered in the absence of
gravity.

General Relativity and Quantum Cosmology