Improved Mixed Dark Matter Halo Model for Ultralight Axions

Abstract

We present a complete halo model for mixed dark matter composed of cold dark matter (CDM) and ultralight axion-like particles (ULAs). Our model treats ULAs as a biased tracer of CDM, in analogy to treatments of massive neutrinos and neutral hydrogen. The model accounts for clustering of ULAs around CDM host halos, and fully models the cross correlations of both components. The model inputs include the ULA Jeans scale, and soliton density profile. Our model can be used to predict the matter power spectrum, $P(k)$, on non-linear scales for sub-populations of ULAs across the mass range $10^{-33}\text{ eV}\le m\le 10^{-21}\text{ eV}$, and can be calibrated against future mixed DM simulations to improve its accuracy. The mixed DM halo model also allows us to assess the importance of various approximations.

18 pages, 11 figures, codes are available at https://github.com/SophieMLV/axionHMcode and https://github.com/SophieMLV/nuHMcode, paper was accepted for publication as a Regular Article in Physical Review D

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• Cosmology with varying fundamental constants from hyperlight, coupled scalars
• Probing interacting dark sector models with future weak lensing-informed galaxy cluster abundance constraints from SPT-3G and CMB-S4
• Pushing the Limits of Detectability: Mixed Dark Matter from Strong Gravitational Lenses
• Implications of multi-axion dark matter on structure formation
• Fermion-Boson Stars as Attractors in Fuzzy Dark Matter and Ideal Gas Dynamics
• Prospects for disentangling dark matter with weak lensing
• Constraining Hot Dark Matter Sub-Species with Weak Lensing and the Cosmic Microwave Background Radiation
• Improved Halo Model Calibrations for Mixed Dark Matter Models of Ultralight Axions
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• The SRG/eROSITA all-sky survey: Constraints on Ultra-light Axion Dark Matter through Galaxy Cluster Number Counts
• Emulating the Non-Linear Matter Power-Spectrum in Mixed Axion Dark Matter Models