Simulating nonlinear cosmological structure formation with massive neutrinos

Abstract

We present a new method for simulating cosmologies that contain massive particles with thermal free streaming motion, such as massive neutrinos or warm/hot dark matter. This method combines particle and fluid descriptions of the thermal species to eliminate the shot noise known to plague conventional N-body simulations. We describe this method in detail, along with results for a number of test cases to validate our method, and check its range of applicability. Using this method, we demonstrate that massive neutrinos can produce a significant scale-dependence in the large-scale biasing of deep voids in the matter field. We show that this scale-dependence may be quantitatively understood using an extremely simple spherical expansion model which reproduces the behavior of the void bias for different neutrino parameters.

20 pages, to be submitted to JCAP

References in corpus (10)

• Observation of electron-antineutrino disappearance at Daya Bay
• High-Resolution Rotation Curves and Galaxy Mass Models from THINGS
• The imprints of primordial non-gaussianities on large-scale structure: scale dependent bias and abundance of virialized objects
• Measurement of Neutrino Oscillation by the K2K Experiment
• Discreteness effects in simulations of Hot/Warm dark matter
• Neutrino cosmology and Planck
• The Cosmic Code Comparison Project
• Halo bias in mixed dark matter cosmologies
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Cited by in corpus (5)

• The Mira-Titan Universe II: Matter Power Spectrum Emulation
• Relativistic N-body simulations with massive neutrinos
• Warm Dark Matter and Cosmic Reionization
• Quintessential Scale Dependence from Separate Universe Simulations
• Impact of Massive Neutrinos and Dark Radiation on the High-redshift Cosmic Web. I. Lyman-Alpha Forest Observables