  We propose a mechanism for system-induced spontaneous time reparametrization
symmetry breaking in canonical gravity. We consider a model of extended
canonical gravity, based on Sen's spinorial expression of the
spatial-diffeomorphism-gauge independent part of the shift vector, with one
additional long-range self-interacting massive spin-$1/2$ particle whose spin
is coupled to Sen's spinor in the Hamiltonian. This additional particle plays
the role of creating the system-induced time reparametrization invariant
potential. We use this potential to break time reparametrization symmetry
spontaneously. We identify the symmetry breaking with the origin of the quantum
energy measurement processes in the ensemble interpretation of quantum
mechanics. Our theory uses a novel interpretation of quantum mechanics with
respect to quantum mechanical position uncertainties of particles. The
spatial-diffeomorphism-gauge independent part of the shift vector is attributed
to this novel interpretation of quantum mechanics.
