Empreintes de l'Énergie Noire sur la structuration de l'Univers
type: Dataset
description: This thesis is dedicated to the research of specific imprints of Dark Energy in both linear and non-linear gravitational collapse processes through theoretical and numerical developments. Indeed, many aspects of cosmology has been tackled: first, to study the influence of various complex Dark Energy models on the halo clustering, we develop in a covariant formalism the usual linear cosmological perturbation theory. It gives an extent of the classical Sasaki-Mukhanov equations to scalar fields coupled with multiple cosmological fluids. The result is the description of the evolution of linear perturbations of complex Dark Energy models with a minimal number of degrees of freedom. In the last decade, the number and quality of cosmological observations on the matter distribution in the Universe as well on the velocity fields have increased exponentially. In particular, recent measurements show the existence of abnormally high velocity fields with respect to the linear theory in $\Lambda$CDM. The explanation of this cosmic flow excess at intermediate scales is the main contribution of this thesis: reinterpreting the anomalous cosmic flow (Watkins et al.) measured at scales ~50 Mpc/h as a rare event realization in linear theory, we propose a new cosmological probe. This probe uses the scale of convergence of the measured cosmic flow with the theoretical one. We develop the sensibility on this new cosmological probe in three competitive Dark Energy models. Those results, based on analytical methods, are compared with measures issued from state-of-the-art numerical simulations we're deeply involved in. Then, starting from those numerical simulations, we investigate the dynamical origin of such a cosmic flow: we prove this movement to be due to an asymmetry of the three-dimensional matter distribution at higher scales (80 Mpc/h). This asymmetry is shown by introducing an original estimator of the matter field, which quantify the deviation from symmetry of a given field. Fina…
landing page: https://theses.hal.science/tel-00783033
keyword: champs-de-vitesse
keyword: cosmologie
keyword: energie-noire
keyword: infoeu-reposemanticsdoctoralthesis
keyword: large-scale-structures
keyword: matiere-noire
keyword: physastrcophysics-physicsastrophysics-astro-phcosmology-and-extra-galactic-astrophysics-a
keyword: sduastrcosciences-of-the-universe-physicsastrophysics-astro-phcosmology-and-extra-galactic
keyword: simulation-numerique
keyword: theses
issued: 2026-05-14T19:25:06.732897
modified: 2026-05-14T19:25:06.732902
language: fr
contact point: Organization
  fn: CCSD

test_moissonnage_selune
type: Agent

Empreintes de l'Énergie Noire sur la structuration de l'Univers
type: Distribution
format: HTML
access URL: https://theses.hal.science/tel-00783033
issued: 2026-05-14T19:25:06.741173
modified: 2026-05-14T19:25:06.710475