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Reheating effects in the matter power spectrum and implications for substructure

Adrienne L. Erickcek1,2,* and Kris Sigurdson3,†

  • 1Canadian Institute for Theoretical Astrophysics, University of Toronto, 60 St. George Street, Toronto, Ontario M5S 3H8, Canada
  • 2Perimeter Institute for Theoretical Physics, 31 Caroline St. N, Waterloo, Ontario N2L 2Y5, Canada
  • 3Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1, Canada

  • *erickcek@cita.utoronto.ca
  • †krs@physics.ubc.ca
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Phys. Rev. D 84, 083503 – Published 5 October, 2011

DOI: https://doi.org/10.1103/PhysRevD.84.083503

Abstract

The thermal and expansion history of the Universe before big bang nucleosynthesis is unknown. We investigate the evolution of cosmological perturbations through the transition from an early matter era to radiation domination. We treat reheating as the perturbative decay of an oscillating scalar field into relativistic plasma and cold dark matter. After reheating, we find that subhorizon perturbations in the decay-produced dark matter density are significantly enhanced, while subhorizon radiation perturbations are instead suppressed. If dark matter originates in the radiation bath after reheating, this suppression may be the primary cutoff in the matter power spectrum. Conversely, for dark matter produced nonthermally from scalar decay, enhanced perturbations can drive structure formation during the cosmic dark ages and dramatically increase the abundance of compact substructures. For low reheat temperatures, we find that as much as 50% of all dark matter is in microhalos with M≳0.1M⊕ at z≃100, compared to a fraction of ∼10−10 in the standard case. In this scenario, ultradense substructures may constitute a large fraction of dark matter in galaxies today.

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Phys. Rev. D 84, 083503– Published 5 October, 2011
  • Received 9 June 2011

© 2011 American Physical Society

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