Slow neutrinos: non-linearity and momentum-space emulation

Abstract

Recent cosmological bounds on the sum of neutrino masses, M_nu = sum m_nu, are in tension with laboratory oscillation experiments, making cosmological tests of neutrino free-streaming imperative. In order to study the scale-dependent clustering of massive neutrinos, we develop a fast linear response method, FAST-nu f, applicable to neutrinos and other non-relativistic hot dark matter. Using it as an accurate linear approximation to help us reduce the dynamic range of emulator training data, based upon a non-linear perturbation theory for massive neutrinos, we improve the emulator's accuracy at small M_nu and length scales by a factor of two. We significantly sharpen its momentum resolution for the slowest neutrinos, which, despite their small mass fraction, dominate small-scale clustering. Furthermore, we extend the emulator from the degenerate to the normal and inverted mass orderings. Applying this new emulator, Cosmic-Enu-II, to large halos in N-body simulations, we show that non-linear perturbation theory can reproduce the neutrino density profile in the halo outskirts, 2R_vir < r < 10R_vir , to better than 10%.

17 pages, 21 figures, 3 tables. Matches version accepted by MNRAS. The Cosmic-Enu-II emulator is available at http://codeberg.org/upadhye/Cosmic-Enu-II and the FAST-nuf linear response method at http://codeberg.org/upadhye/FASTnuf

References in corpus (78)

• A Universal Density Profile from Hierarchical Clustering
• The cosmological simulation code GADGET-2
• Exploring the Expansion History of the Universe
• Accelerating Universes with Scaling Dark Matter
• Baryonic Features in the Matter Transfer Function
• The Aquarius Project: the subhalos of galactic halos
• Cosmological Perturbation Theory in the Synchronous vs. Conformal Newtonian Gauge
• Cosmological Perturbation Theory in the Synchronous and Conformal Newtonian Gauges
• The Pantheon+ Analysis: Cosmological Constraints
• Power Spectra for Cold Dark Matter and its Variants
• COLOSSUS: A python toolkit for cosmology, large-scale structure, and dark matter halos
• Rotation-Dependent Catastrophic Disruption of Gravitational Aggregates
• Dependence of the outer density profiles of halos on their mass accretion rate
• NuFit-6.0: Updated global analysis of three-flavor neutrino oscillations
• The Quijote simulations
• Cosmic Structure Growth and Dark Energy
• The splashback radius as a physical halo boundary and the growth of halo mass
• Towards a precision calculation of $N_{\mathrm{eff}}$ in the Standard Model II: Neutrino decoupling in the presence of flavour oscillations and finite-temperature QED
• Neutrino decoupling including flavour oscillations and primordial nucleosynthesis
• A precision calculation of relic neutrino decoupling
• The Coyote Universe II: Cosmological Models and Precision Emulation of the Nonlinear Matter Power Spectrum
• Gravitational clustering of relic neutrinos and implications for their detection
• Flowing with Time: a New Approach to Nonlinear Cosmological Perturbations
• The Coyote Universe III: Simulation Suite and Precision Emulator for the Nonlinear Matter Power Spectrum
• DESI 2024 VII: Cosmological Constraints from the Full-Shape Modeling of Clustering Measurements
• Neutrino physics with the PTOLEMY project: active neutrino properties and the light sterile case
• Detection of the Splashback Radius and Halo Assembly bias of Massive Galaxy Clusters
• Precision Early Universe Thermodynamics made simple: $N_{\mathrm{eff}}$ and Neutrino Decoupling in the Standard Model and beyond
• An efficient implementation of massive neutrinos in non-linear structure formation simulations
• FAST-PT: a novel algorithm to calculate convolution integrals in cosmological perturbation theory
• The Mira-Titan Universe II: Matter Power Spectrum Emulation
• The splashback radius of halos from particle dynamics. II. Dependence on mass, accretion rate, redshift, and cosmology
• Direct neutrino-mass measurement based on 259 days of KATRIN data
• Non-linear Power Spectrum including Massive Neutrinos: the Time-RG Flow Approach
• Nonlinear power spectrum in the presence of massive neutrinos: perturbation theory approach, galaxy bias and parameter forecasts
• SWIFT: A modern highly-parallel gravity and smoothed particle hydrodynamics solver for astrophysical and cosmological applications
• Halo bias in mixed dark matter cosmologies
• Towards a precision calculation of the effective number of neutrinos $N_{\mathrm{eff}}$ in the Standard Model I: The QED equation of state
• Higher order corrections to the large scale matter power spectrum in the presence of massive neutrinos
• Fast Large Scale Structure Perturbation Theory using 1D FFTs
• Small Scale Perturbations in a General MDM Cosmology
• FAST-PT II: an algorithm to calculate convolution integrals of general tensor quantities in cosmological perturbation theory
• Relativistic N-body simulations with massive neutrinos
• Massive neutrinos and cosmic composition
• An optimal nonlinear method for simulating relic neutrinos
• Scale-dependent bias and bispectrum in neutrino separate universe simulations
• Cosmological neutrino simulations at extreme scale
• Precision reconstruction of the dark matter-neutrino relative velocity from N-body simulations
• Reducing Noise in Cosmological N-body Simulations with Neutrinos
• The splashback boundary of haloes in hydrodynamic simulations
• The Mira-Titan Universe IV. High Precision Power Spectrum Emulation
• A natural boundary of dark matter haloes revealed around the minimum bias and maximum infall locations
• First detection of scale-dependent linear halo bias in $N$-body simulations with massive neutrinos
• Neutrino clustering around spherical dark matter halos
• A fast particle-mesh simulation of non-linear cosmological structure formation with massive neutrinos
• Differential Neutrino Condensation onto Cosmic Structure
• Measurement of the Cold Dark Matter-Neutrino Dipole in the TianNu Simulation
• Growth index with the exact analytic solution of sub-horizon scale linear perturbation for dark energy models with constant equation of state
• Measurement of Neutrino Masses from Relative Velocities
• Redshift-space distortions in massive neutrino and evolving dark energy cosmologies
• Neutrino mass and dark energy constraints from redshift-space distortions
• Describing massive neutrinos in cosmology as a collection of independent flows
• First measurement of the characteristic depletion radius of dark matter haloes from weak lensing
• Euclid: Modelling massive neutrinos in cosmology -- a code comparison
• Probing Neutrino Hierarchy and Chirality via Wakes
• One line to run them all: SuperEasy massive neutrino linear response in $N$-body simulations
• Parity-odd Neutrino Torque Detection
• The cosmic neutrino background as a collection of fluids in large-scale structure simulations
• Physical evolution of dark matter halo around the depletion boundary
• On the importance of nonlinear couplings in large-scale neutrino streams
• A physical and concise halo model based on the depletion radius
• Neutrino winds on the sky
• Cosmological Perturbation Theory for streams of relativistic particles
• Cosmological perturbations: non-cold relics without the Boltzmann hierarchy
• Improving initialization and evolution accuracy of cosmological neutrino simulations
• Hybrid multi-fluid-particle simulations of the cosmic neutrino background
• Looking beyond lambda
• Rapid and accurate numerical evolution of linear cosmological perturbations with non-cold relics