Simulating nonlinear cosmological structure formation with massive neutrinos

Arka Banerjee, Neal Dalal

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish (US)
Article number15
JournalJournal of Cosmology and Astroparticle Physics
Issue number11
StatePublished - Nov 7 2016


  • Cosmic web
  • Cosmological neutrinos
  • Cosmological simulations
  • Neutrino masses from cosmology

ASJC Scopus subject areas

  • Astronomy and Astrophysics


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