An Analogy of the Quantum Hall Condutivity in a Lorentz-symmetry Violation Setup

We investigated some influences of unconventional physics, such Lorentz-symmetry violation, for quantum mechanical systems. In this context, we calculated a important contribution for Standard Model Extension. In the non-relativistic limit, we obtained a analogy of the Landau levels and the quantum Hall conductivity related to this contribution for low energy systems.Comment: 12 pages, no figure

Influência da maturação do fruto na germinação da semente de coco.

Avalia o efeito do estágio de maturação do fruto no processo germinativo da semente de coco.bitstream/item/81730/1/CPATC-COM.-TEC.-27-98.pd

Herdabilidade de caracteres vegetativos de quatro cultivares de coqueiro anão.

bitstream/item/26145/1/f-14.pd

Floração e frutificação de três cultivares de Coqueiro anão.

bitstream/CPATC/19768/1/f_05_2007.pdfExiste o documento impresso

Fenologia da frutificação do coqueiro anão amarelo da Malásia nos Tabuleiros Costeiros de Sergipe.

bitstream/item/26143/1/f-12.pd

Influência da maturação do fruto na germinação da semente da mangaba.

bitstream/item/26574/1/cot-34.pd

Noncommutative analogue Aharonov-Bohm effect and superresonance

We consider the idea of modeling a rotating acoustic black hole by an idealized draining bathtub vortex which is a planar circulating flow phenomenon with a sink at the origin. We find the acoustic metric for this phenomenon from a noncommutative Abelian Higgs model. As such the acoustic metric not only describes a rotating acoustic black hole but also inherits the noncommutative characteristic of the spacetime. We address the issues of superresonance and analogue Aharonov-Bohm (AB) effect in this background. We mainly show that the scattering of planar waves by a draining bathtub vortex leads to a modified AB effect and due to spacetime noncommutativity, the phase shift persists even in the limit where the parameters associated with the circulation and draining vanish. Finally, we also find that the analogue AB effect and superresonance are competing phenomena at a noncommutative spacetime.Comment: 14 pages, no figures, Latex, version to appear in PR