Papers › Measuring the Hubble Constant with cosmic chronometers: a machine learning approach
Measuring the Hubble Constant with cosmic chronometers: a machine learning approach
Carlos Bengaly, Maria Aldinez Dantas, Luciano Casarini, Jailson Alcaniz
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Local measurements of the Hubble constant (H₀) based on Cepheids e Type Ia supernova differ by ≈5 σ from the estimated value of H₀ from Planck CMB observations under ΛCDM assumptions. In order to better understand this H₀ tension, the comparison of different methods of analysis will be fundamental to interpret the data sets provided by the next generation of surveys. In this paper, we deploy machine learning algorithms to measure the H₀ through a regression analysis on synthetic data of the expansion rate assuming different values of redshift and different levels of uncertainty. We compare the performance of different regression algorithms as Extra-Trees, Artificial Neural Network, Gradient Boosting, Support Vector Machines, and we find that the Support Vector Machine exhibits the best performance in terms of bias-variance tradeoff in most cases, showing itself a competitive cross-check to non-supervised regression methods such as Gaussian Processes.
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