2 papers
gr-qc1999
Vacuum-driven Metamorphosis
Leonard Parker, Alpan Raval
We show that nonperturbative vacuum effects can produce a vacuum-driven transition from a matter-dominated universe to one in which the effective equation of state is that of radia…
gr-qc1998
Testable Consequences of Curved-Spacetime Renormalization
Leonard Parker
I consider certain renormalization effects in curved spacetime quantum field theory. In the very early universe these effects resemble those of a cosmological constant, while in th…