Constraints on dark-matter properties from large-scale structure

Abstract

We use large-scale cosmological observations to place constraints on the dark-matter pressure, sound speed and viscosity, and infer a limit on the mass of warm-dark-matter particles. Measurements of the cosmic microwave background (CMB) anisotropies constrain the equation of state and sound speed of the dark matter at last scattering at the per mille level. Since the redshifting of collisionless particles universally implies that these quantities scale like $a^{-2}$ absent shell crossing, we infer that today $w_{(\mathrm{DM})}<10^{-10.0}$, $c_{\mathrm{s},(\mathrm{DM})}^2<10^{-10.7}$ and $c_{\mathrm{vis},(\mathrm{DM})}^2<10^{-10.3}$ at the $99\%$ confidence level. This very general bound can be translated to model-dependent constraints on dark-matter models: for warm dark matter these constraints imply $m>70$ eV, assuming it decoupled while relativistic around the same time as the neutrinos; for a cold relic, we show that $m>100$ eV. We separately constrain the properties of the DM fluid on linear scales at late times, and find upper bounds $c_{\mathrm{s},(\mathrm{DM})}^2<10^{-5.9}$, $c_{\mathrm{vis},(\mathrm{DM})}^2<10^{-5.7}$, with no detection of non-dust properties for the DM.

17 pages, 9 figures: v2 reflects version accepted for publication by PRD. Added discussion of kinetic decoupling

References in corpus (12)

• The Clustering of the SDSS DR7 Main Galaxy Sample I: A 4 per cent Distance Measure at z=0.15
• The Effective Field Theory of Cosmological Large Scale Structures
• A search for ultra-light axions using precision cosmological data
• Realistic sterile neutrino dark matter with keV mass does not contradict cosmological bounds
• Constraints on Dark Matter annihilations from reionization and heating of the intergalactic gas
• Crossing the Phantom Divide
• Dark energy with non-adiabatic sound speed: initial conditions and detectability
• Massive Neutrinos in Cosmology: Analytic Solutions and Fluid Approximation
• Hidden Negative Energies in Strongly Accelerated Universes
• Boltzmann hierarchy for interacting neutrinos I: formalism
• Discrepancies between CFHTLenS cosmic shear & Planck: new physics or systematic effects?
• Constraints on the basic parameters of dark matter using the Planck data

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