Nonlinear growth of structure in cosmologies with damped matter fluctuations

Abstract

We investigate the nonlinear evolution of structure in variants of the standard cosmological model which display damped density fluctuations relative to cold dark matter (e.g. in which cold dark matter is replaced by warm or interacting DM). Using N-body simulations, we address the question of how much information is retained from different scales in the initial linear power spectrum following the nonlinear growth of structure. We run a suite of N-body simulations with different initial linear matter power spectra to show that, once the system undergoes nonlinear evolution, the shape of the linear power spectrum at high wavenumbers does not affect the non-linear power spectrum, while it still matters for the halo mass function. Indeed, we find that linear power spectra which differ from one another only at wavenumbers larger than their half-mode wavenumber give rise to (almost) identical nonlinear power spectra at late times, regardless of the fact that they originate from different models with damped fluctuations. On the other hand, the halo mass function is more sensitive to the form of the linear power spectrum. Exploiting this result, we propose a two parameter model of the transfer function in generic damped scenarios, and show that this parametrisation works as well as the standard three parameter models for the scales on which the linear spectrum is relevant.

18 pages, 20 figures. LateX. Minor changes, references added. Matches the version published on JCAP

References in corpus (19)

• Too big to fail? The puzzling darkness of massive Milky Way subhaloes
• Transients from Initial Conditions in Cosmological Simulations
• New Constraints on the free-streaming of warm dark matter from intermediate and small scale Lyman-$\alpha$ forest data
• The Cosmic Linear Anisotropy Solving System (CLASS) I: Overview
• Stellar Feedback in Dwarf Galaxy Formation
• Sterile neutrinos, dark matter, and the pulsar velocities in models with a Higgs singlet
• Dark-matter sterile neutrinos in models with a gauge singlet in the Higgs sector
• Discreteness effects in simulations of Hot/Warm dark matter
• Using the Milky Way satellites to study interactions between cold dark matter and radiation
• "Non-cold" dark matter at small scales: a general approach
• keV Sterile Neutrino Dark Matter from Singlet Scalar Decays: Basic Concepts and Subtle Features
• The inner structure of haloes in Cold+Warm dark matter models
• The phase space density of fermionic dark matter haloes
• keV Sterile Neutrino Dark Matter from Singlet Scalar Decays: The Most General Case
• Dark matter-radiation interactions: the impact on dark matter haloes
• Shedding light on the small-scale crisis with CMB spectral distortions
• Power Spectrum and Signatures for Cascade Inflation
• A new smooth-$k$ space filter approach to calculate halo abundances
• The Effect of Thermal Velocities on Structure Formation in N-body Simulations of Warm Dark Matter

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