The Role of Relativistic Effects in Future Cosmic Surveys

Diplôme Thèse The Role of Relativistic Effects in Future Cosmic Surveys eng 2024-07-08 2024-07-12 author Sobral Blanco Daniel 0000-0001-9559-3651 907307 Département de physique théorique (FITEO) director Bonvin Camille 602758 Département de physique théorique (FITEO) 249 10.13097/archive-ouverte/unige:178894 urn:nbn:ch:unige-1788945 Sc. 5832 This thesis investigates the significance of relativistic effects in the large scale distribution of galaxies at late times, particularly gravitational redshift, in future cosmic surveys. Traditionally, phenomena like redshift-space distortions and gravitational lensing have been key in understanding the large-scale structure of the Universe and testing General Relativity. Redshift-space distortions highlight peculiar velocities of galaxies, creating anisotropic clustering patterns, while gravitational lensing distorts the apparent positions, shapes and magnitudes of background galaxies due to massive structures bending light in the path towards our detectors. These phenomena provide crucial insights into the matter-geometry relationship in the cosmos. However, additional relativistic effects, often overlooked in cosmological studies, are expected to play a vital role in future analyses. Gravitational redshift, where photons lose energy climbing out of gravitational wells, resulting in an additional redshift, has been measured in astrophysical contexts but not fully integrated into cosmological surveys. This thesis demonstrates that gravitational redshift will be essential for analyzing data from upcoming Stage IV galaxy surveys, serving as a direct probe of spacetime geometry and helping to resolve parameter degeneracies in models beyond General Relativity. Finally, the thesis discusses the potential of relativistic effects to improve the precision of measuring magnification and evolution biases, which are important astrophysical systematics for detecting deviations from Gaussianity or testing the Cosmological Principle. Large-scale Structure Galaxy clustering Gravitational Lensing Testing Gravity Cosmic Surveys General Relativity Horndeski theories Dewey 500.2 37 Département de physique théorique 133 false 969 Groupe Bonvin 3c17d939-e1a7-45f0-bb43-74e6a131414e Thesis Public DSB_manuscript.pdf 5813079 application/pdf CC BY e776e43cf4f76778445a617cca1a8697aa98c647f556de3b47cf5861e8be6de9 3da5aa61-b9f5-42b5-b13e-29c2e9919a69 Imprimatur Public PhD_imprimatur.pdf 726922 application/pdf 54c37e4346a01cf0105f48306aad7828b37be39e0ebf774eff83274be2cb4f4d openAccess Faculté des sciences / Section de physique / Département de physique théorique

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Sobral Blanco, Daniel

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