Scalar Perturbation in Symmetric Lee-Wick Bouncing Universe
arXiv:1109.5753 · doi:10.1088/1475-7516/2011/11/043
Abstract
We investigate the scalar perturbation in the Lee-Wick bouncing universe driven by an ordinary scalar field plus a ghost field. We consider only a symmetric evolution of the universe and the scalar fields about the bouncing point. The gauge invariant Sasaki-Mukhanov variable is numerically solved in the spatially flat gauge. We find a new form of the initial perturbation growing during the contracting phase. After the bouncing, this growing mode stabilizes to a constant mode which is responsible for the late-time power spectrum.
21 pages, 6 figures, references are added