Combining different observational probes, such as galaxy clustering and weak lensing, is a promising technique for unveiling the physics of the Universe with upcoming dark energy experiments. The galaxy redshift sample from the Dark Energy Spectroscopic Instrument (DESI) will have a significant overlap with major ongoing imaging surveys specifically designed for weak lensing measurements: the Kilo-Degree Survey (KiDS), the Dark Energy Survey (DES), and the Hyper Suprime-Cam (HSC) survey. In this work, we analyse simulated redshift and lensing catalogues to establish a new strategy for combining high-quality cosmological imaging and spectroscopic data, in view of the first-year data assembly analysis of DESI. In a test case fitting for a reduced parameter set, we employ an optimal data compression scheme able to identify those aspects of the data that are most sensitive to cosmological information and amplify them with respect to other aspects of the data. We find this optimal compression approach is able to preserve all the information related to the growth of structures.
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ABSTRACT -
Castorina, Emanuele ; Hand, Nick ; Seljak, Uroš ; Beutler, Florian ; Chuang, Chia-Hsun ; Zhao, Cheng ; Gil-Marín, Héctor ; Percival, Will J. ; Ross, Ashley J. ; Choi, Peter Doohyun ; et al ( , Journal of Cosmology and Astroparticle Physics)
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Zhu, Fangzhou ; Padmanabhan, Nikhil ; Ross, Ashley J ; White, Martin ; Percival, Will J ; Ruggeri, Rossana ; Zhao, Gong-bo ; Wang, Dandan ; Mueller, Eva-Maria ; Burtin, Etienne ; et al ( , Monthly Notices of the Royal Astronomical Society)
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Abolfathi, Bela ; Aguado, D. S. ; Aguilar, Gabriela ; Prieto, Carlos Allende ; Almeida, Andres ; Ananna, Tonima Tasnim ; Anders, Friedrich ; Anderson, Scott F. ; Andrews, Brett H. ; Anguiano, Borja ; et al ( , The Astrophysical Journal Supplement Series)