Euclid Mission's Likelihood Pipeline Extended for Advanced Cosmological Models

This paper describes the extensions made to the Cosmology Likelihood for Observables in Euclid (CLOE) pipeline to accommodate alternative cosmological models and refine the theoretical modeling of Euclid's primary probes. The modifications include incorporating the magnification bias term into the spectroscopic two-point correlation function of galaxy clustering and adapting the implementation of Euclid's primary photometric probes to account for massive neutrinos and modified gravity extensions. The validation of these modifications is performed through dedicated forecasts on synthetic Euclid-like data, demonstrating the pipeline's capability to produce reliable cosmological forecasts. The authors also identify several functionalities with regards to beyond-LCDM modeling that could be further improved within CLOE, outlining potential research directions to enhance pipeline efficiency and flexibility through novel inference and machine learning techniques. This work is crucial for maximizing the scientific return of the Euclid mission and advancing our understanding of the universe's fundamental constituents.

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