Reducing noise in cosmological N-body simulations with neutrinos

Banerjee, Arka; Powell, Devon; Abel, Tom; Villaescusa-Navarro, Francisco

doi:10.1088/1475-7516/2018/09/028

Title: Reducing noise in cosmological N-body simulations with neutrinos

Journal Article · Mon Sep 17 00:00:00 EDT 2018 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2018/09/028· OSTI ID:1475420

Banerjee, Arka ^[1]; Powell, Devon ^[1]; Abel, Tom ^[1]; Villaescusa-Navarro, Francisco ^[2]

Stanford Univ., CA (United States). Kavli Institute for Particle Astrophysics and Cosmology and Department of Physics; SLAC National Accelerator Lab., Menlo Park, CA (United States)
Flatiron Institute, New York, NY (United States). Center for Computational Astrophysics

In this study, we present a new method for generating initial conditions for numerical cosmological simulations in which massive neutrinos are treated as an extra set of N-body (collisionless) particles. It allows us to accurately follow the density field for both Cold Dark Matter (CDM) and neutrinos at both high and low redshifts. At high redshifts, the new method is able to reduce the shot noise in the neutrino power spectrum by a factor of more than 107 compared to previous methods, where the power spectrum was dominated by shot noise at all scales. We find that our new approach also helps to reduce the noise on the total matter power spectrum on large scales, whereas on small scales the results agree with previous simulations. Our new method also allows for a systematic study of clustering of the low velocity tail of the distribution function of neutrinos. Lastly, this method also allows for the study of the evolution of the overall velocity distribution as a function of the environment determined by the CDM field.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1475420

Journal Information:: Journal of Cosmology and Astroparticle Physics, Vol. 2018, Issue 09; ISSN 1475-7516

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 34 works

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