Dynamics of assisted quintessence

Kim, S. A., Liddle, A. R. and Tsujikawa, S. (2005) Dynamics of assisted quintessence. Physical Review D, 72 (4). 0435061-0435066. ISSN 0556-2821

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We explore the dynamics of assisted quintessence, where more than one scalar field is present with the same potential. For potentials with tracking solutions, the fields naturally approach the same values — in the context of inflation this leads to the assisted inflation phenomenon where several fields can cooperate to drive a period of inflation though none is able to individually. For exponential potentials, we study the fixed points and their stability confirming results already in the literature, and then carry out a numerical analysis to show how assisted quintessence is realized. For inverse power-law potentials, we find by contrast that there is no assisted behaviour — indeed those are the unique (monotonic) potentials where several fields together behave just as a single field in the same potential. More generally, we provide an algorithm for generating a single-field potential giving equivalent dynamics to multi-field assisted quintessence.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QB Astronomy
Depositing User: SRO Admin
Date Deposited: 03 Apr 2007
Last Modified: 12 Mar 2017 11:03
URI: http://srodev.sussex.ac.uk/id/eprint/1128
Google Scholar:23 Citations

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