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Les idées noires de la physique. Ciel noir, corps noir, trou noir, matière noire et énergie noire : pourquoi cette fascination du noir chez les physiciens ? Cette interrogation permet de traverser l'histoire de la physique et d'éclairer nombre de ses enjeux actuels. Le noir de la nuit est une énigme paradoxale qui a préoccupé les astronomes pendant des siècles ; le rayonnement du corps noir est à l'origine de la révolution quantique ; le trou noir est une fascinante singularité spatiotemporelle ; la matière noire et l'énergie noire sont des hypothèses mystérieuses de la cosmologie contemporaine. A partir de leurs disciplines respectives, un astrophysicien et un philosophe des sciences apportent un éclairage à la fois critique et émerveillé sur les idées noires de la physique !
Physics --- Astrophysics --- Black holes (Astronomy) --- Dark matter (Astronomy) --- Dark energy (Astronomy) --- Black
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This thesis represents a unique mix of theoretical work discussing the Lorentz theory of gravity and experimental work searching for supersymmetry with the Compact Muon Solenoid experiment at the Large Hadron Collider. It begins by reviewing a set of widely-discussed theoretical solutions to the cosmological constant problem, including a natural solution provided by the recently developed Lorentz gauge theory of gravity. The Schwartzschild metric, de Sitter space, and quantum versions of the theory are also discussed. The thesis then looks to supersymmetry for an alternative solution. The idea behind supersymmetry is reviewed and an experimental search for supersymmetry is presented. A major contribution was to estimate one of the most significant backgrounds in this search, which arises from top-antitop quark pair production or W boson production in association with multiple jets where the W boson decays into the hadronically-decaying tau leptons and neutrinos. This background was estimated through a novel method involving kinematically analogous events but including a well-measured muon. This search significantly extends limits on supersymmetric partners of gluons from previous searches.
Physics. --- Gravitation. --- Cosmology. --- Elementary particles (Physics). --- Quantum field theory. --- Particle acceleration. --- Elementary Particles, Quantum Field Theory. --- Particle Acceleration and Detection, Beam Physics. --- Classical and Quantum Gravitation, Relativity Theory. --- Dark energy (Astronomy) --- Cosmological constants. --- Astrophysics --- Force and energy --- Cosmical constants --- Astronomical constants --- Constants of integration --- Quantum theory. --- Particles (Nuclear physics) --- Acceleration (Mechanics) --- Nuclear physics --- Acceleration --- Field theory (Physics) --- Matter --- Physics --- Antigravity --- Centrifugal force --- Relativity (Physics) --- Astronomy --- Deism --- Metaphysics --- Relativistic quantum field theory --- Quantum theory --- Elementary particles (Physics) --- High energy physics --- Nuclear particles --- Nucleons --- Properties
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