The SpECTRE CCE Module

The goal of numerical relativity is to extract waveforms at future null infinity so that they can be used by LVK in waveform analysis. A Cauchy-Characteristic Evolution (CCE) of Einstein's equations is well suited to do this because the metric is actually evolved to future null infinity, which means you are able to capture more dynamics such as gravitational wave memory. Additionally, after frame-fixing, different CCE waveforms can be compared directly which facilitates cross-code comparison of waveforms. The SpECTRE numerical relativity code has a standalone module to run CCE and extract the strain and Weyl scalars at future null infinity. In this talk, I will present improvements to the CCE module that allow users of other numerical relativity codes to easily convert their metric on a spherical worldtube into the SpECTRE format and run CCE.