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• W3091962013 abstract "ABSTRACT The interpretation of cosmological observables requires the use of increasingly sophisticated theoretical models. Since these models are becoming computationally very expensive and display non-trivial uncertainties, the use of standard Bayesian algorithms for cosmological inferences, such as Markov chain Monte Carlo (MCMC), might become inadequate. Here, we propose a new approach to parameter estimation based on an iterative Gaussian emulation of the target likelihood function. This requires a minimal number of likelihood evaluations and naturally accommodates for stochasticity in theoretical models. We apply the algorithm to estimate 9 parameters from the monopole and quadrupole of a mock power spectrum in redshift space. We obtain accurate posterior distribution functions with approximately 100 times fewer likelihood evaluations than an affine invariant MCMC, roughly independently from the dimensionality of the problem. We anticipate that our parameter estimation algorithm will accelerate the adoption of more accurate theoretical models in data analysis, enabling more comprehensive exploitation of cosmological observables." @default.
• W3091962013 created "2020-10-15" @default.
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• W3091962013 date "2020-10-08" @default.
• W3091962013 modified "2023-10-17" @default.
• W3091962013 title "Cosmological parameter estimation via iterative emulation of likelihoods" @default.
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• W3091962013 doi "https://doi.org/10.1093/mnras/staa3075" @default.
• W3091962013 hasPublicationYear "2020" @default.
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