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Robust sampling for weak lensing and clustering analyses with the Dark Energy Survey

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arxiv 2202.08233 v1 pith:DGLSYAEQ submitted 2022-02-16 astro-ph.CO astro-ph.IM

P. Lemos , N. Weaverdyck , R. P. Rollins , J. Muir , A. Ferté , A. R. Liddle , A. Campos , D. Huterer
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M. Raveri J. Zuntz E. Di Valentino X. Fang W. G. Hartley M. Aguena S. Allam J. Annis E. Bertin S. Bocquet D. Brooks D. L. Burke A. Carnero Rosell M. Carrasco Kind J. Carretero F. J. Castander A. Choi M. Costanzi M. Crocce L. N. da Costa M. E. S. Pereira J. P. Dietrich S. Everett I. Ferrero J. Frieman J. García-Bellido M. Gatti E. Gaztanaga D. W. Gerdes D. Gruen R. A. Gruendl J. Gschwend G. Gutierrez S. R. Hinton D. L. Hollowood K. Honscheid D. J. James K. Kuehn N. Kuropatkin M. Lima M. March P. Melchior F. Menanteau R. Miquel R. Morgan A. Palmese F. Paz-Chinchón A. Pieres A. A. Plazas Malagón A. Porredon E. Sanchez V. Scarpine M. Schubnell S. Serrano I. Sevilla-Noarbe M. Smith E. Suchyta M. E. C. Swanson G. Tarle D. Thomas C. To T. N. Varga J. Weller
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abstract

Recent cosmological analyses rely on the ability to accurately sample from high-dimensional posterior distributions. A variety of algorithms have been applied in the field, but justification of the particular sampler choice and settings is often lacking. Here we investigate three such samplers to motivate and validate the algorithm and settings used for the Dark Energy Survey (DES) analyses of the first 3 years (Y3) of data from combined measurements of weak lensing and galaxy clustering. We employ the full DES Year 1 likelihood alongside a much faster approximate likelihood, which enables us to assess the outcomes from each sampler choice and demonstrate the robustness of our full results. We find that the ellipsoidal nested sampling algorithm $\texttt{MultiNest}$ reports inconsistent estimates of the Bayesian evidence and somewhat narrower parameter credible intervals than the sliced nested sampling implemented in $\texttt{PolyChord}$. We compare the findings from $\texttt{MultiNest}$ and $\texttt{PolyChord}$ with parameter inference from the Metropolis-Hastings algorithm, finding good agreement. We determine that $\texttt{PolyChord}$ provides a good balance of speed and robustness, and recommend different settings for testing purposes and final chains for analyses with DES Y3 data. Our methodology can readily be reproduced to obtain suitable sampler settings for future surveys.

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  1. Modelling Galaxy Clustering and Tomographic Galaxy-Galaxy Lensing with HSC Y3 and SDSS using the Point-Mass Correction Model and Redshift Self-Calibration

    astro-ph.CO 2025-07 conditional novelty 5.0 of 10

    Combining SDSS clustering with HSC Y3 galaxy-galaxy lensing, with a point-mass correction down to 2 Mpc/h, gives S8 = 0.804 ± 0.051 and self-calibrated redshift shifts for the two highest source bins.

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