Cosmological implications of a QCD-like composite Higgs model
Abstract: Some of the shortcomings of the Standard Model of particle physics are the 'unnatural' value of the mass of the Higgs boson and the fact that the model cannot account for the process of baryogenesis - a mechanism which generates the observed asymmetry between matter and anti-matter in the Universe. The former is related to the fundamental scalar nature of the Higgs boson, connected to quadratic divergences in the mass corrections. The latter is related to the fact that the Standard Model does not accommodate all three Sakharov conditions necessary for baryogenesis to occur. We present an effective UV-complete composite Higgs model built in analogy to Quantum Chromodynamics and confined at higher energy scales of O(TeV). The parameter-space of the model and the particle spectra have been explored and first-order phase transitions are sought for. The purpose is to study whether the gravitational waves produced by such events could be detected by the LISA interferometer as well as other proposed projects such as BBO and DECIGO. Albeit not many, such parameter-space points that feature strong first-order phase transitions did indeed cross the sensitivity curves of all three interferometers. A couple of benchmark points produced a very high signal-to-noise ratio value and one of them is within LISA's sensitivity domain. The thesis demonstrates that such strongly confined theories, going by the name of technicolor, may indeed provide potentially observable cosmological consequences worth further exploration.
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