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# Structure formation with a self-tuning scalar field

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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 $$\Omega=1$$ 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.

### Most cited references2

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### The observational case for a low-density Universe with a non-zero cosmological constant

(1995)
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### Massive Neutrinos and the Large-Scale Structure of the Universe

(1980)
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### Author and article information

###### Journal
25 July 1997
###### Article
10.1103/PhysRevLett.79.4740
astro-ph/9707286
767a365d-1e9a-40e3-9535-3c8afba2a0de
CfPA/97-th-07
Phys.Rev.Lett. 79 (1997) 4740-4743
4 pages, uses RevTex, 2 figures
astro-ph hep-ph

General astrophysics,High energy & Particle physics
General astrophysics, High energy & Particle physics