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mass-Peak Patch algorithm for fast generation of deep all-sky dark matter halo catalogues and its N -body validation.
- Source :
-
Monthly Notices of the Royal Astronomical Society . Feb2019, Vol. 483 Issue 2, p2236-2250. 15p. - Publication Year :
- 2019
-
Abstract
- We present a detailed description and validation of our massively parallel update to the mass-Peak Patch method, a fully predictive initial-space algorithm to quickly generate dark matter halo catalogues in very large cosmological volumes. We perform an extensive systematic comparison to a suite of N -body simulations covering a broad range of redshifts and simulation resolutions, and find that, without any parameter fitting, our method is able to generally reproduce N -body results while typically using over 3 orders of magnitude less CPU time, and a fraction of the memory cost. Instead of calculating the full non-linear gravitational collapse determined by an N -body simulation, the mass-Peak Patch method finds an overcomplete set of just-collapsed structures around a hierarchy of density-peak points by coarse-grained (homogeneous) ellipsoidal dynamics. A complete set of mass peaks, or haloes, is then determined by exclusion of overlapping patches, and second-order Lagrangian displacements are used to move the haloes to their final positions and to give their flow velocities. Our results show that the mass-Peak Patch method is well suited for creating large ensembles of halo catalogues to mock cosmological surveys, and to aid in complex statistical interpretations of cosmological models. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00358711
- Volume :
- 483
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Monthly Notices of the Royal Astronomical Society
- Publication Type :
- Academic Journal
- Accession number :
- 134187415
- Full Text :
- https://doi.org/10.1093/mnras/sty3226