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νCONCEPT: Cosmological neutrino simulations from the non-linear Boltzmann hierarchy

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In this paper the non-linear effect of massive neutrinos on cosmological structures is studied in a conceptually new way. We have solved the non-linear continuity and Euler equations for the neutrinos on a grid in real space in N-body simulations, and closed the Boltzmann hierarchy at the non-linear Euler equation using the stress and pressure perturbations from linear theory. By comparing with state-of-the art cosmological neutrino simulations, we are able to simulate the non-linear neutrino power spectrum very accurately for small to moderate neutrino masses. This translates into a negligible error in the matter power spectrum, and so our νCOnCEPT code is ideally suited for extracting the neutrino mass from future high precision non-linear observational probes such as Euclid.

Original languageEnglish
Article number052
JournalJournal of Cosmology and Astroparticle Physics
Volume2019
Issue2
Number of pages30
ISSN1475-7516
DOIs
Publication statusPublished - 26 Feb 2019

    Research areas

  • cosmological neutrinos, cosmological simulations, MASSIVE NEUTRINOS

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