Relaxion Physics: a new solution to the hierarchy problem

• Ano de defesa: 2019
• Autor(a) principal: Comar, Naim Elias
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: eng
• Instituição de defesa: Biblioteca Digitais de Teses e Dissertações da USP
• Palavras-chave em Português: Axion; Chiral Perturbation Theory; Cosmological Relaxation of the Electroweak Scale; Física de Partículas; Hierarchy Problem; Particle Physics; Problema da Hierarquia; Relaxamento Cosmológico da Escala Eletrofraca; Relaxion; Teoria de Perturbação Quiral
• Link de acesso: http://www.teses.usp.br/teses/disponiveis/43/43134/tde-22042019-150352/

The electroweak hierarchy problem is one of the most important puzzles of particle physics that remains without conclusive answer nowadays. One of the most recent new class of solutions to this problem is presented in this thesis, i.e., the cosmological relaxation of the electroweak scale. In this framework, we postulate the existence of a new particle, the relaxion, which drives the Higgs mass to values much smaller than the cutoff of the theory during inflation. As tools to develop this subject, this work presents a resume of chiral perturbation theory, the strong CP problem, axions and the eta prime particle. Finally, we will describe the most simple model of cosmological relaxation of the electroweak scale and the non-QCD model, where a new strong group SU(N) forms a condensate that interacts with the relaxion.