Tutusaus, Isaac Bonvin, Camille Grimm, Nastassia
We present the first measurement of the Weyl potential at four redshifts bins using data from the first three years of observations of the Dark Energy Survey (DES). The Weyl potential, which is the sum of the spatial and temporal distortions of the Universe's geometry, provides a direct way of testing the theory of gravity and the validity of the $...
Pierra, Grégoire
Les ondes gravitationnelles constituent une nouvelle sonde pour explorer l’Univers et étudier des phénomènes cosmiques jusque-là inaccessibles. Cette thèse se base sur des données d’ondes gravitationnelles récoltées par les détecteurs de la collaboration scientifique LIGO-Virgo-KAGRA. La première partie de ce travail porte sur la cosmologie avec le...
Souveton, Vincent
This PhD thesis is dedicated to the development and analysis of sampling algorithms with applications to the inference of cosmological parameters. We first review the mathematical tools as well as the cosmological framework. Then, we introduce two algorithms. The first one is called PDMC-BORG. It is a non-reversible Markov Chain Monte Carlo sampler...
Gallo, Stefano
Galaxy clusters are the most massive gravitationally bound objects in the Universe. They form from the highest peaks in the primordial density fields, and are located at the nodes of a complex filamentary network called the cosmic web. The number of clusters as a function of mass and redshift, known as cluster number counts, has emerged as a powerf...
Koechler, Jordan
Among the open problems of modern physics, dark matter (DM) is one of the most fascinating. It explains several gravitational anomalies observed at different scales: the flatness of rotation curves of spiral galaxies, the dynamics of galaxy clusters, the distribution of large-scale structures in the Universe, and the anisotropies in the temperature...
Weymann-Despres, Gilles
This thesis is devoted to the study of cosmological inflation, a phase of accelerated expansion in the early universe that remains speculative to this day. The central observable for this study is the cosmic microwave background (CMB), the oldest light still visible today, whose statistical study enables cosmological inference.We first approach the...
van den Abeele, Enya
The discovery of the accelerating expansion of the Universe in 1998 turned our vision of the physical phenomena governing its evolution on its head. The cause of this acceleration, which opposes the expected action of gravity, is called "dark energy" by cosmologists, and its origin remains undetermined to this day. Several cosmological probes can b...
Weeks, Andrew Kahn, Didier
Paracelsus (1493-1541) stands at a crossroads associated with the Renaissance andReformation. His cosmological-meteorological writings exemplify the turning pointthat progressively challenged the older worldview and opened fresh avenues. Hisnature philosophy is often, as can be seen here, the very ground on which hismedicine was built. This volume ...
Cléry, Simon
Inflation is currently the most promising theory for depicting the initial conditions in the early Universe. In the simplest models, a scalar field, the inflaton, is slowly rolling down its potential with high energy density, making the Universe exponentially expand. On top of this mechanism of accelerated expansion, quantum fluctuations of the inf...
Navas, S. Amsler, C. Gutsche, T. Hanhart, C. Hernández-Rey, J. J. Lourenço, C. Masoni, A. Mikhasenko, M. Mitchell, R. E. Patrignani, C.
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The Review summarizes much of particle physics and cosmology. Using data from previous editions, plus 2,717 new measurements from 869 papers, we list, evaluate, and average measured properties of gauge bosons and the recently discovered Higgs boson, leptons, quarks, mesons, and baryons. We summarize searches for hypothetical particles such as super...
