CosmoSIS Parameter Estimator

Purpose

Provides expert guidance on CosmoSIS for cosmological parameter estimation, including modular likelihood construction and MCMC sampling.

Capabilities

• Modular likelihood construction
• Multiple sampler support (emcee, multinest, polychord)
• Prior specification
• Chain analysis and diagnostics
• Plotting and visualization
• Pipeline construction

Usage Guidelines

1. Pipeline Setup: Configure modular analysis pipeline
2. Likelihoods: Build likelihood functions from data
3. Priors: Specify parameter priors
4. Sampling: Run MCMC with appropriate sampler
5. Analysis: Analyze chains and compute posteriors

Tools/Libraries

• CosmoSIS
• emcee
• GetDist