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. Our results may also be useful for 21 cm tomography constraints on alternative cosmological models for the formation of large scale structure.
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- CDM and Baryons as Distinct Fluids in a Linear Approximation for the Growth of Structure
- Krauss, Lawrence (Author)
- Dent, James (Author)
- De, Soma (Author)
- College of Liberal Arts and Sciences (Contributor)
- Digital object identifier: 10.1103/PhysRevD.88.023510
- Identifier TypeInternational standard serial numberIdentifier Value1088-6826
- Identifier TypeInternational standard serial numberIdentifier Value0002-9939
- Copyright (2013) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. along with the following message: The following article appeared in (CDM and baryons as distinct fluids in a linear approximation for the growth of structure. Physical Review D, 88(2)) and may be found at http://journals.aps.org.ezproxy1.lib.asu.edu/prd/abstract/10.1103/PhysRevD.88.023510), opens in a new window.
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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