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 |