DSpace Communidade:
https://repositorio.ufma.br/jspui/handle/123456789/467
Sun, 19 Sep 2021 17:38:29 GMT2021-09-19T17:38:29ZRELATÓRIO DE ESTÁGIO PÓS-DOUTORAL
https://repositorio.ufma.br/jspui/handle/123456789/877
Título: RELATÓRIO DE ESTÁGIO PÓS-DOUTORAL
Autor(es): LANDRIM, Aline Vieria
Descrição: Relatório de estágio pós-doutoral realizado no Programa de Pós-Graduação em Ciência Animal, sob a supervisão da Profª. Michelle de Oliveira Maia Parente.Mon, 01 Jan 2018 00:00:00 GMThttps://repositorio.ufma.br/jspui/handle/123456789/8772018-01-01T00:00:00ZTrapping of spin-0 fields on tube-like topological defects
https://repositorio.ufma.br/jspui/handle/123456789/862
Título: Trapping of spin-0 fields on tube-like topological defects
Autor(es): CASANA, R.; GOMES, A. R.; MENEZES, R.; SIMAS, Fabiano de Carvalho
Resumo: We have considered the localization of resonant bosonic states described by a scalar field Φ trapped in
tube-like topological defects. The tubes are formed by radial symmetric defects in (2, 1) dimensions,
constructed with two scalar fields φ and χ, and embedded in the (3, 1)-dimensional Minkowski
spacetime. The general coupling between the topological defect and the scalar field Φ is given by the
potential ηF (φ,χ)Φ2. After a convenient decomposition of the field Φ, we find that the amplitudes of
the radial modes satisfy Schrödinger-like equations whose eigenvalues are the masses of the bosonic
resonances. Specifically, we have analyzed two simple couplings: the first one is F (φ,χ) = χ2 for a
fourth-order potential and, the second one is a sixth-order interaction characterized by F (φ,χ) = (φχ)2.
In both cases the Schrödinger-like equations are numerically solved with appropriated boundary
conditions. Several resonance peaks for both models are obtained and the numerical analysis showed
that the fourth-order potential generates more resonances than the sixth-order one.Wed, 01 Jan 2014 00:00:00 GMThttps://repositorio.ufma.br/jspui/handle/123456789/8622014-01-01T00:00:00ZTrapping Spin-0 particles on p-balls in (D, 1) dimensions
https://repositorio.ufma.br/jspui/handle/123456789/861
Título: Trapping Spin-0 particles on p-balls in (D, 1) dimensions
Autor(es): CASANA, R.; GOMES, A. R.; SIMAS, Fabiano de Carvalho
Resumo: p-Balls are topological defects in (D, 1) dimensions constructed with M≥1 scalar fields which depend radially on only 2 ≤ p ≤ D − 2 spatial dimensions. Such defects are characterized by an action that breaks translational invariance and are inspired on the physics of a brane with D − p extra dimensions. Here we consider the issue of localization of bosonic states described by a scalar field Φ sufficiently weak to not disturb sensibly the defect configuration. After describing the general formalism, we consider some specify examples with M = 1, 2 and 3, looking for some region of parameters where bound and resonant bosonic states can be found. We investigate the way the influence of the defect structure, number of radial dimensions and coupling between the fields are related to the occurrence of bound and resonant states.
Descrição: CC BYThu, 01 Jan 2015 00:00:00 GMThttps://repositorio.ufma.br/jspui/handle/123456789/8612015-01-01T00:00:00ZSuppression of two-bounce windows in kink-antikink collisions
https://repositorio.ufma.br/jspui/handle/123456789/860
Título: Suppression of two-bounce windows in kink-antikink collisions
Autor(es): SIMAS, Fabiano de Carvalho; GOMES, Adalto R.; NOBREGA, K. Z.; OLIVEIRA, J. C. R. E.
Resumo: We consider a class of topological defects in (1, 1)-dimensions with a deformed ϕ 4 kink structure whose stability analysis leads to a Schrödinger-like equation with a zero-mode and at least one vibrational (shape) mode. We are interested in the dynamics of kink-antikink collisions, focusing on the structure of two-bounce windows. For small deformation and for one or two vibrational modes, the observed two-bounce windows are explained by the standard mechanism of a resonant effect between the first vibrational and the translational modes. With the increasing of the deformation, the effect of the appearance of more than one vibrational mode is the gradual disappearance of the initial two-bounce windows. The total suppression of two-bounce windows even with the presence of a vibrational mode offers a counterexample from what expected from the standard mechanism. For extremely large deformation the defect has a 2-kink structure with one translational and one vibrational mode, and the standard structure of two-bounce windows is recovered.
Descrição: CC BYFri, 01 Jan 2016 00:00:00 GMThttps://repositorio.ufma.br/jspui/handle/123456789/8602016-01-01T00:00:00Z