Repositório UNIFEI UNIFEI - Campus 1: Itajubá PPG - Programas de Pós Graduação Dissertações

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

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