  We discuss the cosmological consequences of QCD phase transition(s) on the
early universe. We argue that our recent knowledge about the transport
properties of quark-gluon plasma (QGP) should throw additional lights on the
actual time evolution of our universe. Understanding the nature of QCD phase
transition(s), which can be studied in lattice gauge theory and verified in
heavy ion experiments, provides an explanation for cosmological phenomenon stem
from early universe.
