Modified Baryonic Dynamics: two-component cosmological simulations with light sterile neutrinos

Journal article

Authors/Editors

Angus, Garry

Research Areas

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Publication Details

Author list: Angus GW, Diaferio A, Famaey B, Gentile G, van der Heyden KJ

Publisher: IOP Publishing

Place: BRISTOL

Publication year: 2014

Journal: Journal of Cosmology and Astroparticle Physics (1475-7516)

Journal acronym: J COSMOL ASTROPART P

Issue number: 10

Number of pages: 17

ISSN: 1475-7516

eISSN: 1475-7516

Languages: English-Great Britain (EN-GB)

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Abstract

In this article we continue to test cosmological models centred on Modified Newtonian Dynamics (MOND) with light sterile neutrinos, which could in principle be a way to solve the fine-tuning problems of the standard model on galaxy scales while preserving successful predictions on larger scales. Due to previous failures of the simple MOND cosmological model, here we test a speculative model where the modified gravitational field is produced only by the baryons and the sterile neutrinos produce a purely Newtonian field (hence Modified Baryonic Dynamics). We use two-component cosmological simulations to separate the baryonic N-body particles from the sterile neutrino ones. The premise is to attenuate the over-production of massive galaxy cluster halos which were prevalent in the original MOND plus light sterile neutrinos scenario. Theoretical issues with such a formulation notwithstanding, the Modified Baryonic Dynamics model fails to produce the correct amplitude for the galaxy cluster mass function for any reasonable value of the primordial power spectrum normalisation.

Keywords

cosmological simulations, dark matter simulations, galaxy clusters, modified gravity

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