Stability of multifield cosmological solutions

Calcagni, Gianluca and Liddle, Andrew R (2008) Stability of multifield cosmological solutions. Physical Review D, 77 (2). ISSN 1550-7998

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We explore the stability properties of multifield solutions of assisted inflation type, where several fields collectively evolve to the same configuration. In the case of noninteracting fields, we show that the condition for such solutions to be stable is less restrictive than that required for tracking in quintessence models. Our results, which do not rely on the slow-roll approximation, further indicate that to linear order in homogeneous perturbations the fields are in fact unaware of each other's existence. We end by generalizing our results to some cases of interacting fields and to other background solutions and dynamics, including the high-energy braneworld.

Item Type: Article
Additional Information: Article Number: 023522
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Depositing User: Andrew Liddle
Date Deposited: 06 Feb 2012 19:43
Last Modified: 02 Jul 2019 20:48

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