  We present a detailed analysis of a quantum model for Loop Quantum Cosmology
based on strict application of the Thiemann regularization algorithm for the
Hamiltonian in Loop Quantum Gravity, extending the results presented previously
in our brief report. This construction leads to a qualitative modification of
the bounce paradigm. Quantum gravity effects still lead to a quantum bounce
connecting deterministically large classical Universes. However, the evolution
features a large epoch of de Sitter Universe, with emergent cosmological
constant of Planckian order, smoothly transiting into a spatially flat
expanding Universe. Moreover, we present an effective Hamiltonian describing
the quantum evolution to high accuracy and for which the dynamics can be solved
analytically.
