Scalar Perturbation in Symmetric Lee-Wick Bouncing Universe

Details Scalar Perturbation in Symmetric Lee-Wick Bouncing Universe Scalar Perturbation in Symmetric Lee-Wick Bouncing Universe

2011-09-27

arxiv.org/abs/1109.5753v2

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

21 pages, 6 figures, references are added

Scientific paper

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.

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