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Assisted inflation

Liddle, Andrew R. and Mazumdar, Anupam and Schunck, Franz E. (1998) Assisted inflation. Physical Review D, 58 (6). ISSN 1550-7998

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    In inflationary scenarios with more than one scalar field, inflation may proceed even if each of the individual fields has a potential too steep for that field to sustain inflation on its own. We show that scalar fields with exponential potentials evolve so as to act cooperatively to assist inflation, by finding solutions in which the energy densities of the different scalar fields evolve in fixed proportion. Such scaling solutions exist for an arbitrary number of scalar fields, with different slopes for the exponential potentials, and we show that these solutions are the unique late-time attractors for the evolution. We determine the density perturbation spectrum produced by such a period of inflation, and show that with multiple scalar fields the spectrum is closer to the scale-invariant than the spectrum that any of the fields would generate individually.

    Item Type: Journal Article
    Journal or Publication Title: Physical Review D
    Additional Information: © 1998 The American Physical Society 4 pages RevTeX file (uses RevTeX). Trivial changes to match accepted version
    Departments: Faculty of Science and Technology > Physics
    ID Code: 31605
    Deposited By: Dr Anupam Mazumdar
    Deposited On: 27 Jan 2010 15:05
    Refereed?: Yes
    Published?: Published
    Last Modified: 27 Apr 2018 02:04
    Identification Number:

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