A Model for Structure Formation Seeded by Gravitationally Produced Matter

Abstract

This model assumes the baryons, radiation, three families of massless neutrinos, and cold dark matter were mutually thermalized before the baryon number was fixed, primeval curvature fluctuations were subdominant, and homogeneity was broken by scale-invariant fluctuations in a new dark matter component that behaves like a relativistic ideal fluid. The fluid behavior could follow if this new component were a single scalar field that interacts only with gravity and with itself by a pure quartic potential. The initial energy distribution could follow if this component were gravitationally produced by inflation. The power spectra of the present distributions of mass and radiation in this model are not inconsistent with the measurements but are sufficiently different from the adiabatic cold dark matter model to allow a sharp test in the near future.

4 pages, 2 figures submitted to ApJ Letters

References in corpus (3)

• A Measurement of the Angular Power Spectrum of the CMB from l = 100 to 400
• Noninteracting dark matter
• The Projected Three-point Correlation Function: Theory and Observations

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• Dynamics of a Dark Matter Field with a Quartic Self-Interaction Potential
• Bumpy Power Spectra and dT/T
• BDM Dark Matter: CDM with a core profile and a free streaming scale
• The Cosmological Tests