A Classical Treatment of Island Cosmology

Abstract

Computing the perturbation spectrum in the recently proposed Island Cosmology remains an open problem. In this paper we present a classical computation of the perturbations generated in this scenario by assuming that the NEC-violating field behaves as a classical phantom field. Using an exactly-solvable potential, we show that the model generates a scale-invariant spectrum of scalar perturbations, as well as a scale-invariant spectrum of gravitational waves. The scalar perturbations can have sufficient amplitude to seed cosmological structure, while the gravitational waves have a vastly diminished amplitude.

8 pages, 1 figure

References in corpus (2)

• Islands in the Lambda-sea: An alternative cosmological model
• Is the island universe model consistent with observations?

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