From Redshift Calibration to Scientific Visualisation: Cosmology, Large-Scale Structure, and Outreach in the Euclid Era

Diplôme Thèse From Redshift Calibration to Scientific Visualisation: Cosmology, Large-Scale Structure, and Outreach in the Euclid Era eng 2026-04-28 2026-04-28 author Kang Yuzheng 0009-0000-8588-7250 974370 director Paltani Stéphane 27695 Département d'astronomie (ASTRO) 10.13097/archive-ouverte/unige:193880 urn:nbn:ch:unige-1938809 Sc. 5994 Weak lensing is one of the primary probes of the matter distribution in the Universe and a cornerstone of the Euclid mission. Its cosmological exploitation requires accurate knowledge of the redshift distributions of source galaxies. A major part of this thesis focuses on the calibration of these distributions, including the validation of spectroscopic reference samples and the development of the Multi-Passband Transfer function, a catalogue-level method designed to mitigate biases between spectroscopic reference samples and Euclid photometric observations. This thesis also investigates the galaxy--halo connection at z<1 through galaxy clustering measurements and halo occupation distribution modelling. By comparing galaxy populations selected by colour and morphology, the results extend studies of the colour--morphology relation beyond the local Universe and provide new constraints on the connection between galaxies and their dark matter haloes. In parallel, I contributed to the visualisation and communication of the cosmic web and other large scale structures within Euclid, developing new approaches for presenting complex survey data to both scientific and public audiences. Cosmology Euclid Redshift Dewey 520 26 Département d'astronomie 12 false ce0d064e-50c7-45a0-a2ca-47b0d120d71d Thesis Public Yuzheng_Kang_PhD_thesis_01-06-2026.pdf 93561662 application/pdf CC BY-NC-4.0 18f377574838f7f580b1f62518500cbfccd3dd6f1b11664074cd51c0e94a7397 7784029b-1ff0-4e50-a152-c64ca092cdd3 Imprimatur Public 3214_001.pdf 48233 application/pdf 4609c03812205fee4af9a46ee918b9f743dcd577d0ee9cf500a45bc701ca56f5 openAccess Faculté des sciences / Département d'astronomie

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From Redshift Calibration to Scientific Visualisation: Cosmology, Large-Scale Structure, and Outreach in the Euclid Era				2026	19	15

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Kang, Yuzheng

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