Galaxy Number Counts on the Light Cone

Diplôme Thèse Galaxy Number Counts on the Light Cone eng 2020-06-18 author Ghosh Basundhara 860785 director Durrer Ruth 0000-0001-9833-2086 106998 10.13097/archive-ouverte/unige:139155 urn:nbn:ch:unige-1391556 Sc. 5457 This thesis aims to explore and emphasise on the significant relativistic contributions to observable galaxy number counts. We start by mathematically proving the frame-invariance of galaxy number counts in Einstein and Jordan frames in the second chapter, and then move on to computing the full-sky correlation function and power spectrum including all relativistic effects in the third chapter. The fourth chapter deals with modelling of the angular power spectra in the redshift space and also accounts for the intermediately nonlinear regime. In the fifth and sixth chapters, we establish the importance of including lensing corrections to the main signal of probes such as galaxy-galaxy lensing, and for measurements in case of tests of gravity like $E_g$ statistics, respectively. Finally, we also talk about the shape and size correlations of galaxies occurring as a part of weak lensing data, arising out of the phenomenon of intrinsic alignment. Dewey 500.2 37 Département de physique théorique 133 false 16e02319-a4db-4445-beac-b29ef51508e4 Thesis Public Thesis_final.pdf 6049431 application/pdf openAccess Faculté des sciences / Section de physique / Département de physique théorique

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Galaxy Number Counts on the Light Cone				2020	855	890

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Ghosh, Basundhara