Structure formation with a self-tuning scalar field

Details Structure formation with a self-tuning scalar field Structure formation with a self-tuning scalar field

1997-07-25

arxiv.org/abs/astro-ph/9707286v1

Phys.Rev.Lett. 79 (1997) 4740-4743

Astronomy and Astrophysics

Astrophysics

4 pages, uses RevTex, 2 figures

Scientific paper

10.1103/PhysRevLett.79.4740

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 $\Omega=1$ 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 $\Omega_\phi \sim 0.1$ which is small enough to be consistent with entry into the attractor prior to nucleosynthesis.

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