  The effective dynamics of scalar-tensor theory (STT) in the Jordan frame is
studied in the context of loop quantum cosmology with holonomy corrections.
After deriving the effective Hamiltonian from the connection dynamics
formulation, we obtain the holonomy-corrected evolution equations of STT on
spatially flat Friedmann-Robterson-Walker background, which exhibit some
interesting features unique to the Jordan frame of STT. In particular, the
linear term of the cosine function appearing in the equations could lead to
dynamics much different from the classical theory in the low-energy limit. In
the latter part of this paper, we choose a particular model in STT -- the
Brans-Dicke theory to specifically illustrate these features. It is found that
in Brans-Dicke theory the effective evolution equations can be classified into
four different cases. Exact solutions of the Friedmann equation in terms of the
internal time are obtained in these cases. Moreover, the solutions in terms of
the proper time describing the late time evolution of the Universe are also
obtained under certain approximation; in two cases the solutions coincide with
the existing solutions in classical Brans-Dicke theory while in the other two
cases the solutions do not.
