Description

A single fluid approximation which treats perturbations in baryons and dark matter as equal has sometimes been used to calculate the growth of linear matter density perturbations in the Universe.

A single fluid approximation which treats perturbations in baryons and dark matter as equal has sometimes been used to calculate the growth of linear matter density perturbations in the Universe. We demonstrate that properly accounting for the separate growth of baryon and dark matter fluctuations can change some predictions of structure formation in the linear domain in a way that can alter conclusions about the consistency between predictions and observations for ΛCDM models vs modified gravity scenarios.

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Date Created
  • 2013-02
Resource Type
  • Text
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    Identifier
    • Digital object identifier: 10.1103/PhysRevD.88.023510
    • Identifier Type
      International standard serial number
      Identifier Value
      1088-6826
    • Identifier Type
      International standard serial number
      Identifier Value
      0002-9939
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    De, S., Dent, J. B., & Krauss, L. M. (2013). CDM and baryons as distinct fluids in a linear approximation for the growth of structure. Physical Review D, 88(2), 023510. doi:10.1103/PhysRevD.88.023510

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