Embedding realistic surveys in simulations through volume remapping

TL;DR

This paper introduces a volume remapping technique that transforms cubic cosmological simulations into elongated shapes, aligning better with real survey geometries while preserving local structures and maintaining computational efficiency.

Contribution

A novel, volume-preserving remapping method that converts cubic simulations into elongated shapes suitable for observational survey comparisons.

Findings

Remappings are one-to-one and volume-preserving.

Local structures are maintained during remapping.

The method involves minimal computational overhead.

Abstract

Connecting cosmological simulations to real-world observational programs is often complicated by a mismatch in geometry: while surveys often cover highly irregular cosmological volumes, simulations are customarily performed in a periodic cube. We describe a technique to remap this cube into elongated box-like shapes that are more useful for many applications. The remappings are one-to-one, volume-preserving, keep local structures intact, and involve minimal computational overhead.