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https://repositorio.unifei.edu.br/jspui/handle/123456789/2358
Tipo: | Dissertação |
Título: | Fluctuations of a massive scalar field: temperature and boundary |
Autor(es): | FERREIRA JUNIOR, Alexsandre Leite |
Primeiro Orientador: | DE LORENCI, Vitorio Alberto |
Resumo: | It is well established that a change in the physical state of a quantum field induces dispersions on the velocity of a interacting non-relativistic test particle. Here such a interacting model is addressed with a finite transition time between states of the field. Underlining that such induced stochastic motion is different from an usual Brownian motion, as, at late times, the dispersions are bounded and do not depend on the interaction time, without the need for a dissipative force. Further, we study the case for a massive scalar field at finite temperatures, thus generalizing previous investigation in [1]. The results presented here show subvacuum effects even at finite temperature. Nonetheless, novel effects are also unveiled, as a detailed description of the thermal contribution highlights their discrepancy to the usual Brownian motion and stresses the opposing character of mass and temperature. The presence of the field mass weakens thermal contributions and temperature hides the characteristic oscillatory pattern of massive fields. Such interplay is even more relevant in the presence of a boundary, when investigating the distance behavior of the dispersions and the vacuum versus thermal dominance near the wall. As for higher masses the vacuum term dominates for larger distances, being able also to create and interchange in such dominance as the wall is approached |
Palavras-chave: | Boundary quantum field theory Stochastic motion Massive scalar field |
CNPq: | CNPQ::CIÊNCIAS EXATAS E DA TERRA::FÍSICA |
Idioma: | eng |
País: | Brasil |
Editor: | Universidade Federal de Itajubá |
Sigla da Instituição: | UNIFEI |
metadata.dc.publisher.department: | IFQ - Instituto de Física e Química |
metadata.dc.publisher.program: | Programa de Pós-Graduação: Mestrado - Física |
Tipo de Acesso: | Acesso Aberto |
URI: | https://repositorio.unifei.edu.br/jspui/handle/123456789/2358 |
Data do documento: | 31-Ago-2020 |
Aparece nas coleções: | Dissertações |
Arquivos associados a este item:
Arquivo | Descrição | Tamanho | Formato | |
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Dissertação_2021078.pdf | 1,59 MB | Adobe PDF | Visualizar/Abrir |
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