User guide

Reference-style guides for using cosmicjellyfish beyond the first forecast.

• Comprehensive guide: backends, observables, survey files and working with Fisher matrices.

• Derivative methods: the finite-difference schemes and how to choose one.

• JAXcosmo and automatic differentiation: the optional JAXcosmo backend, autodiff providers and comparison notebook.

• GCsp forecasts through intermediate parameters: the GCsp intermediate-parameter forecast and its Jacobian projection, with validation results.

• Likelihood sampling with Nautilus: posterior sampling with Nautilus, to check or replace the Fisher approximation.

• CMB benchmarks: CMB observables, shipped experiment specifications and the smoke-test script.