An automatically generated code for relativistic inhomogeneous cosmologies

Abstract

The applications of numerical relativity to cosmology are on the rise, contributing insight into such cosmological problems as structure formation, primordial phase transitions, gravitational-wave generation, and inflation. In this paper, I present the infrastructure for the computation of inhomogeneous dust cosmologies which was used recently to measure the effect of nonlinear inhomogeneity on the cosmic expansion rate. I illustrate the code's architecture, provide evidence for its correctness in a number of familiar cosmological settings, and evaluate its parallel performance for grids of up to several billion points. The code, which is available as free software, is based on the Einstein Toolkit infrastructure, and in particular leverages the automated-code-generation capabilities provided by its component Kranc.

11 pages, 6 figures

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• Mathematical General Relativity
• Cosmological distances with general-relativistic ray tracing: framework and comparison to cosmographic predictions
• Cosmology using numerical relativity
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• Isolating non-linearities of light propagation in inhomogeneous cosmologies
• BiGONLight: light propagation with bi-local operators in Numerical Relativity
• Redshift drift in a universe with structure III: Numerical relativity
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