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A better way to define dark matter haloes

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dc.contributor.author Garcia, Rafael en_US
dc.contributor.author Salazar, Edgar en_US
dc.contributor.author Rozo, Eduardo en_US
dc.contributor.author ADHIKARI, SUSMITA en_US
dc.contributor.author Aung, Han en_US
dc.contributor.author Diemer, Benedikt en_US
dc.contributor.author Nagai, Daisuke en_US
dc.contributor.author Wolfe, Brandon en_US
dc.date.accessioned 2023-05-15T06:14:27Z
dc.date.available 2023-05-15T06:14:27Z
dc.date.issued 2023-05 en_US
dc.identifier.citation Monthly Notices of the Royal Astronomical Society, 521(2), 2464–2476. en_US
dc.identifier.issn 0035-8711 en_US
dc.identifier.issn 1365-2966 en_US
dc.identifier.uri https://doi.org/10.1093/mnras/stad660 en_US
dc.identifier.uri http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/7852
dc.description.abstract Dark matter haloes have long been recognized as one of the fundamental building blocks of large-scale structure formation models. Despite their importance – or perhaps because of it! – halo definitions continue to evolve towards more physically motivated criteria. Here, we propose a new definition that is physically motivated, effectively unique, and parameter-free: ‘A dark matter halo is comprised of the collection of particles orbiting in their own self-generated potential’. This definition is enabled by the fact that, even with as few as ≈300 particles per halo, nearly every particle in the vicinity of a halo can be uniquely classified as either orbiting or infalling based on its dynamical history. For brevity, we refer to haloes selected in this way as physical haloes. We demonstrate that (1) the mass function of physical haloes is Press–Schechter, provided the critical threshold for collapse is allowed to vary slowly with peak height; and (2) the peak-background split prediction of the clustering amplitude of physical haloes is statistically consistent with the simulation data, with accuracy no worse than ≈5 per cent. en_US
dc.language.iso en en_US
dc.publisher Oxford University Press en_US
dc.subject Dark matter en_US
dc.subject Large-scale structure of Universe en_US
dc.subject Cosmology: theory en_US
dc.subject 2023-MAY-WEEK1 en_US
dc.subject TOC-MAY-2023 en_US
dc.subject 2023 en_US
dc.title A better way to define dark matter haloes en_US
dc.type Article en_US
dc.contributor.department Dept. of Physics en_US
dc.identifier.sourcetitle Monthly Notices of the Royal Astronomical Society en_US
dc.publication.originofpublisher Foreign en_US


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