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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.

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

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            Massive Neutrinos and the Large-Scale Structure of the Universe

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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
              Custom metadata
              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

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