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Structure formation with a self-tuning scalar field

Pedro G. Ferreira·Michael Joyce
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Abstract

A scalar field with an exponential potential has the particular property that it is attracted into a solution in which its energy scales as the dominant component (radiation or matter) of the Universe, contributing a fixed fraction of the total energy density. We study the growth of perturbations in a CDM dominated $Ω=1$ universe with this extra field, with an initial flat spectrum of adiabatic fluctuations. The observational constraints from structure formation are satisfied as well, or better, than in other models, with a contribution to the energy density from the scalar field $Ω_ϕ\sim 0.1$ which is small enough to be consistent with entry into the attractor prior to nucleosynthesis.

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Pedro G. Ferreira, Michael Joyce. 1997-07-25. Structure formation with a self-tuning scalar field. https://doi.org/10.1103/physrevlett.79.4740

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