PolyChord: nested sampling for cosmology

2015/02/28 by W. J. Handley, M. P. Hobson, A. N. Lasenby · 5 citations
Physics and Astronomy · #astro-ph.CO #astro-ph.IM

paper · pdf · doi:10.1093/mnrasl/slv047

Accepted by MNRAS 2015 March 20. Received 2015 March 20; in original form 2015 February 6, 5 pages, 5 figures

arxiv created 2015/03/28 · arxiv updated 2015/06/23

Abstract

PolyChord is a novel nested sampling algorithm tailored for high dimensional parameter spaces. In addition, it can fully exploit a hierarchy of parameter speeds such as is found in CosmoMC and CAMB. It utilises slice sampling at each iteration to sample within the hard likelihood constraint of nested sampling. It can identify and evolve separate modes of a posterior semi-independently and is parallelised using openMPI. PolyChord is available for download at: http://ccpforge.cse.rl.ac.uk/gf/project/polychord/

Cited by

• First analytical coverage bounds of a fully specified nested sampling algorithm
• Nested Sampling with Slice-within-Gibbs: Efficient Evidence Calculation for Hierarchical Bayesian Models
• Statistical Nuances in BAO Analysis: Likelihood Formulations and Non-Gaussianities
• Coupled quintessence from an axion dark sector
• Barrow and Tsallis entropies after the DESI DR2 BAO data

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