COSMICS: Cosmological Initial Conditions and Microwave Anisotropy Codes

TL;DR

COSMICS is a comprehensive Fortran package that computes cosmological transfer functions, microwave background anisotropies, and generates initial conditions for structure formation simulations, aiding cosmological research.

Contribution

It introduces a set of four Fortran programs for calculating transfer functions, anisotropy spectra, and matter power spectra, with plans for parallel computing enhancements.

Findings

Provides tools for accurate cosmological modeling

Enables generation of initial conditions for simulations

Supports analysis of microwave background anisotropies

Abstract

COSMICS is a package of fortran programs useful for computing transfer functions and microwave background anisotropy for cosmological models, and for generating gaussian random initial conditions for nonlinear structure formation simulations of such models. Four programs are provided: {\bf linger\_con} and {\bf linger\_syn} integrate the linearized equations of general relativity, matter, and radiation in conformal Newtonian and synchronous gauge, respectively; {\bf deltat} integrates the photon transfer functions computed by the linger codes to produce photon anisotropy power spectra; and {\bf grafic} tabulates normalized matter power spectra and produces constrained or unconstrained samples of the matter density field. Version 1.0 of COSMICS is available at http://arcturus.mit.edu/cosmics/ . The current release gives fortran-77 programs that run on workstations and vectorized supercomputers. Unix makefiles are included that make it simple to build and test the package. A future release will include portable parallel versions of the linger codes using standard message-passing libraries.