The Value of H₀ from Gaussian Processes

2014/07/19 by Busti, Vinicius C., Clarkson, Chris, Seikel, Marina · 1 citation
#Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc)

paper · doi:10.48550/arxiv.1407.5227

Abstract

A new non-parametric method based on Gaussian Processes was proposed recently to measure the Hubble constant H₀. The freedom in this approach comes in the chosen covariance function, which determines how smooth the process is and how nearby points are correlated. We perform coverage tests with a thousand mock samples within the LCDM model in order to determine what covariance function provides the least biased results. The function Matern(5/2) is the best with sligthly higher errors than other covariance functions, although much more stable when compared to standard parametric analyses.

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