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Article

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Published version

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2024-10-15

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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/221159

Halo bias in the peak model: A first-principles nonparametric approach

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https://doi.org/10.3847/1538-4357/ad70ae

Abstract

The Press–Schechter (PS) and excursion set (ES) models of structure formation fail in reproducing the halo bias found in simulations, while the ES-peaks' formalism built in the peak model reproduces it only at high masses and does not address in a fully satisfactory manner peak nesting, and the mass and time of ellipsoidal collapse of triaxial peaks in the Gaussian-smoothed density field. Here, we apply the confluent system of peak trajectories formalism fixing all these issues from first principles and with no free parameters to infer the Lagrangian local peak bias parameters, which adopt very simple analytic expressions similar to those found in the PS and ES models. The predicted Eulerian linear halo bias recovers the results of simulations. More specifically, we show that the only small departure observed at intermediate and low masses can be due to the spurious halo splitting and grouping caused by the spherical overdensity halo-finding algorithm used in simulations.

Subject

Matèria fosca (Astronomia), Cosmologia, Física nuclear

Subject (English)

Dark matter (Astronomy), Cosmology, Nuclear physics

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Articles publicats en revistes (Física Quàntica i Astrofísica)
Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))

Citation

SALVADOR SOLÉ, Eduard and MANRIQUE OLIVA, Alberto. Halo bias in the peak model: A first-principles nonparametric approach. Astrophysical Journal. 2024. Vol. 974, num. 2, pags. 1-16. ISSN 0004-637X. [consulted: 17 of August of 2026]. Available at: https://hdl.handle.net/2445/221159

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