Scale-invariant spectrum of Lee-Wick model in de Sitter spacetime
arXiv:1412.7263 · doi:10.1088/1475-7516/2015/02/044
Abstract
We obtain a scale-invariant spectrum from the Lee-Wick model in de Sitter spacetime. This model is a fourth-order scalar theory whose mass parameter is determined by . The Harrison-Zel'dovich scale-invariant spectrum is obtained by Fourier transforming the propagator in position space as well as by computing the power spectrum directly. It shows clearly that the LW scalar theory provides a truly scale-invariant spectrum in whole de Sitter, while the massless scalar propagation in de Sitter shows a scale-invariant spectrum in the superhorizon region only.
arXiv comment1+11 pages, no figures
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