Fluctuations of a massive scalar field: temperature and boundary

FERREIRA JUNIOR, Alexsandre Leite

dc.creator	FERREIRA JUNIOR, Alexsandre Leite
dc.date.issued	2020-08-31
dc.identifier.uri	https://repositorio.unifei.edu.br/jspui/handle/123456789/2358
dc.description.sponsorship	Agência 1	pt_BR
dc.language	eng	pt_BR
dc.publisher	Universidade Federal de Itajubá	pt_BR
dc.rights	Acesso Aberto	pt_BR
dc.subject	Boundary quantum field theory	pt_BR
dc.subject	Stochastic motion	pt_BR
dc.subject	Massive scalar field	pt_BR
dc.title	Fluctuations of a massive scalar field: temperature and boundary	pt_BR
dc.type	Dissertação	pt_BR
dc.date.available	2021-03-25
dc.date.available	2021-03-25T14:48:06Z
dc.date.accessioned	2021-03-25T14:48:06Z
dc.creator.Lattes	http://lattes.cnpq.br/0375563373339784	pt_BR
dc.contributor.advisor1	DE LORENCI, Vitorio Alberto
dc.contributor.advisor1Lattes	http://lattes.cnpq.br/1361400129993392	pt_BR
dc.description.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	pt_BR
dc.publisher.country	Brasil	pt_BR
dc.publisher.department	IFQ - Instituto de Física e Química	pt_BR
dc.publisher.program	Programa de Pós-Graduação: Mestrado - Física	pt_BR
dc.publisher.initials	UNIFEI	pt_BR
dc.subject.cnpq	CNPQ::CIÊNCIAS EXATAS E DA TERRA::FÍSICA	pt_BR
dc.relation.references	FERREIRA JUNIOR, Alexsandre Leite. Fluctuations of a massive scalar field: temperature and boundary. 2020. 70 f. Dissertação (Mestrado em Física) – Universidade Federal de Itajubá, Itajubá, 2020.	pt_BR