Pipeline blueprint

The scientific objective is to extract cosmological information using field-level inference on DESI galaxy clustering jointly with CMB lensing convergence maps from Planck and ACT. The future implementation is expected to cover the following stages:

• Survey ingestion: downloading, validating, and documenting DESI tracer selections alongside Planck/ACT lensing maps, masks, and noise properties.
• Forward modeling: simulating the coupled matter field, galaxy observables, and lensing reconstructions needed for FLI-based likelihoods.
• Likelihood & inference: developing the Fourier-space field-level likelihood together with control analyses (e.g., 3×2pt) for cross-validation.
• Validation: performing null tests, generating mocks, and executing consistency checks that span instrument systematics to cosmological parameters.
• Reporting: producing reproducible figures, tables, and documentation to support thesis deliverables and eventual publications.

Field-level inference will run primarily on NERSC (Perlmutter). Configuration files living under configs/nersc/ describe queue, storage, and environment setup; see docs/hpc.md for operational details.

The current repository provides only the scaffolding (package layout, tests, MkDocs, CI). Each stage should be populated under src/desi_cmb_fli/ as the thesis work advances.