Anisotropic separate universe simulations

Abstract

The long-wavelength coherent overdensity and tidal force, which are not direct observables for a finite-volume survey, affect time evolution of cosmic structure formation and therefore clustering observables through the mode coupling. In this paper we develop an "anisotropic" separate universe (SU) simulation technique to simulate large-scale structure formation taking into account the effect of large-scale tidal force into the anisotropic expansion of local background. We modify the TreePM N-body simulation code to implement the anisotropic SU simulations, and then study the "response" function of matter power spectrum that describes how the matter power spectrum responds to the large-scale tidal effect as a function of wavenumber and redshift for a given global cosmology. We test and validate the SU simulation results from the comparison with the perturbation theory predictions and the results from high-resolution PM simulations. We find that the response function displays characteristic scale dependences over the range of scales down to nonlinear scales, up to k ~ 6 h/Mpc.

15 pages, 10 figures, 1 table, accepted for publication in MNRAS, added a figure and a subsection, changed to double column

References in corpus (13)

• Wide-Field InfrarRed Survey Telescope-Astrophysics Focused Telescope Assets WFIRST-AFTA 2015 Report
• Transients from Initial Conditions in Cosmological Simulations
• The Mira-Titan Universe II: Matter Power Spectrum Emulation
• Separate Universe Simulations
• Super-Sample Signal
• Multitracing Anisotropic Non-Gaussianity with Galaxy Shapes
• Hydrodynamic Response of the Intergalactic Medium to Reionization
• Scale-Dependent Galaxy Bias from Massive Particles with Spin during Inflation
• Improving geometric and dynamical constraints on cosmology with intrinsic alignments of galaxies
• Anisotropies of galaxy ellipticity correlations in real and redshift space: angular dependence in linear tidal alignment model
• Baryonic effects on weak-lensing two-point statistics and its cosmological implications
• Measuring the Tidal Response of Structure Formation: Anisotropic Separate Universe Simulations using TreePM
• Large-Scale Tides in General Relativity

Cited by in corpus (19)

• Large-scale dark matter simulations
• Galaxy bias from forward models: linear and second-order bias of IllustrisTNG galaxies
• Galaxy imaging surveys as spin-sensitive detector for cosmological colliders
• Power spectrum of halo intrinsic alignments in simulations
• Tightening geometric and dynamical constraints on dark energy and gravity: galaxy clustering, intrinsic alignment and kinetic Sunyaev-Zel'dovich effect
• Cosmological simulation in tides: power spectra and halo shape responses, and shape assembly bias
• Responses of Halo Occupation Distributions: a new ingredient in the halo model & the impact on galaxy bias
• The Ly$\alpha$ forest flux correlation function: a perturbation theory perspective
• Gravitational wave fossils in nonlinear regime: halo tidal bias and intrinsic alignments from gravitational wave separate universe simulations
• Local Primordial Non-Gaussianities and Super-Sample Variance
• Lagrangian approach to super-sample effects on biased tracers at field level: galaxy density fields and intrinsic alignments
• Super-sample covariance of the power spectrum, bispectrum, halos, voids, and their cross covariances
• Impacts of pre-initial conditions on anisotropic separate universe simulations: a boosted tidal response in the epoch of reionization
• Cosmological boost factor for dark matter annihilation at redshifts of $z=10$-$100$ using the power spectrum approach
• Probabilistic Lagrangian bias estimators and the cumulant bias expansion
• A semi-analytic estimate for the effective sound speed counterterm in the EFTofLSS
• An empirical nonlinear power spectrum overdensity-response
• Large-scale structure with superhorizon isocurvature dark energy
• Probing dipolar power asymmetry with galaxy clustering and intrinsic alignments