Colisões Kink-Antikink no modelo 𝜙4 na presença de impureza

• Ano de defesa: 2024
• Autor(a) principal: SOARES, Maurício Antônio Coutinho
• Orientador(a): SIMAS, Fabiano de Carvalho
• Banca de defesa: SANTOS, Carlos Eduardo da Hora , MARQUES, Matheus Araújo , SIMAS, Fabiano de Carvalho
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal do Maranhão
• Programa de Pós-Graduação: PROGRAMA DE PÓS-GRADUAÇÃO EM FÍSICA/CCET
• Departamento: DEPARTAMENTO DE FÍSICA/CCET
• País: Brasil
• Palavras-chave em Português: defeitos topológicos; modelo ϕ4; impurezas; colisões; paredes espectrais; paredes de vácuo;
• Palavras-chave em Inglês: topological defects; ϕ4 model; impurities; collisions; spectral walls; vacuum walls.
• Área do conhecimento CNPq: Física
• Link de acesso: https://tedebc.ufma.br/jspui/handle/tede/5546

In this dissertation, we conduct a theoretical analysis of scalar fields in physics. We also study the Bogomol’nyi-Prasad-Sommerfield equation, which is used to obtain the solution to the equation of motion, in addition to the study of topological defects. An analysis of the ϕ4 model was performed based on collisions of the kink-antikink pair, generated various results such as two-bounce windows and bions. At the core of the work, we couple the ϕ4 model with the impurity σj, whose effect can be controlled through it’s amplitude. Such coupling leads to different phenomena, known as spectral walls, which attract the pair, and vacuum walls, which repel the pair, influencing the action of the kink-antikink pair. As a result, new outcomes are observed, such as trapping between the walls. These walls act as a barrier in the pair’s evolution, where the spectral wall arises when the kink’s oscillation mode enters the continuous spectrum, and the vacuum wall arises where the vacuum of the original model is localized.