Speakers: Azadeh Moradinezhad (Laboratoire d’Annecy-le-Vieux de Physique Th\u00e9orique (LAPTh))
\nLe mod\u00e8le \/CDM d\u00e9crit remarquablement bien l’Univers observ\u00e9, mais il ne rend pas compte de l’origine des structures ni de lanature du secteur sombre. La pr\u00e9cision croissante des observations met en \u00e9vidence des tensions pouvant signaler une nouvellephysique. Dans cet expos\u00e9, je pr\u00e9senterai mes travaux et mon programme \u00e0 venir pour exploiter les structures \u00e0 grande \u00e9chelle etrechercher de telles signatures \u00e0 partir de deux observables compl\u00e9mentaires : le regroupement des galaxies et la cartographie enintensit\u00e9 de raies spectrales (LIM). L’essentiel de l’information encore sous-exploit\u00e9e se situe (i) aux petites \u00e9chelles non lin\u00e9aires, o\u00f9l’on peut r\u00e9duire la variance d’\u00e9chantillonnage en moyennant sur de nombreuses structures ind\u00e9pendantes, \u00e0 condition de mod\u00e9lisercorrectement les non-lin\u00e9arit\u00e9s et les effets baryoniques, et (ii) \u00e0 grand d\u00e9calage vers le rouge, o\u00f9 les fluctuations restent plusproches des conditions initiales. Je pr\u00e9senterai des avanc\u00e9es pour extraire l’information non gaussienne du regroupement etmontrerai comment la LIM mm\/sub-mm \u00e9tend les analyses de LSS \u00e0 haut redshift\/d\u00e9calage vers le rouge gr\u00e2ce \u00e0 une att\u00e9nuationrobuste des premiers plans et une mod\u00e9lisation pr\u00e9cise du signal. Je conclurai en montrant comment la compl\u00e9mentarit\u00e9 desprincipales sondes de la LSS peut \u00eatre exploit\u00e9e dans des analyses multi-sondes coh\u00e9rentes pour une cosmologie de pr\u00e9cisionrobuste au-del\u00e0 de la limite gaussienne.
\nThe \/CDM model has been remarkably successful in describing the observed Universe, yet it does not explain the origin of structureor the nature of the dark sector. Growing observational precision is exposing tensions that may be early signs of new physics,offering dues to these puzzles. ln this talk, 1 will present my research over the last decade and outline my future program to exploitlarge-scale structure (LSS) to search for new-physics imprints using two complementary observables: galaxy clustering and lineintensitymapping (LIM). Much of the untapped information in LSS resides on small nonlinear scales, where averaging over manyindependent features of the cosmic web can beat down sample variance if nonlinear and baryonic effects are modeled accurately,and at high redshifts, where fluctuations remain doser to the initial conditions. 1 will present advances in extracting non-Gaussianinformation from nonlinear clustering and show how mm\/sub-mm LIM extends LSS analyses to the high-redshift Universe throughrobust foreground mitigation and accurate signal modeling. 1 will conclude by outlining how the complementarity of key LSS probescan be leveraged in coherent multi-probe analyses for robust precision cosmology beyond the Gaussian limit.
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