Is Dark Energy from a Vacuum Metamorphosis a possibility in the Universe?
The recent observational data of the Cosmic Microwave Background by the Wilkinson Microwave Anisotropy Probe (WMAP) and the type-Ia supernovae by the Essence Project have significantly increased our understanding of the dynamics of the Universe and indicate a late-time non-zero dark energy epoch. Together, these two data sets provide tight constraints on any prospective cosmological models. In this talk, I will consider the Vacuum Metamorphosis (VM) model of Leonard Parker and Alpan Raval (PR). The role of dark energy in this model is played by a free, low mass, quantized, scalar field in curved spacetime. PR showed that this field adds to the classical Einstein-Hilbert action an effective action which is a function of order parameters Ricci squared, Riemann squared and Scalar Curvature squared. Solutions of the resulting equations of motion can cause a sudden and very sharp transition to dark energy domination which occurred approximately 7 billion years ago and is much more potent th
