  The quantum nature of the Big Bang is reexamined in the framework of Loop
Quantum Cosmology. The strict application of a regularization procedure to the
Hamiltonian, originally developed for the Hamiltonian in loop quantum gravity,
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 flat expanding Universe.
