Speakers
Description
The evolution of the universe in modified loop quantum cosmologies exhibits universal properties for sharply peaked states, similar to that in the standard loop quantum cosmology (LQC). In this talk, I shall present our recent investigations on such universal properties for the modified loop quantum cosmological model I (mLQC-I), by paying particular attention to the evolution before the quantum bounce - the so-called contracting phase. In particular, we find that the evolution is soon dominated by a Planck-size effective cosmological constant, whereby the universe enters a pre-de Sitter epoch, which is universal and independent of the choice of the potential of the scalar field. Thus, the whole contracting phase can be universally divided into two periods, the pre-de Sitter and the pre-bouncing. Although the duration of the pre-bouncing period depends on the potential of the scalar field, the background solution during this epoch is universal.
