8,229 research outputs found
Rydberg states of hydrogen-like ions in braneworld
It has been argued that precise measurements of optical transition
frequencies between Rydberg states of hydrogen-like ions could be used to
obtain an improved value of the Rydberg constant and even to test Quantum
Electrodynamics (QED) theory more accurately, by avoiding the uncertainties
about the proton radius. Motivated by this perspective, we investigate the
influence of the gravitational interaction on the energy levels of
Hydrogen-like ions in Rydberg states within the context of the braneworld
models. As it is known, in this scenario, the gravitational interaction is
amplified in short distances. We show that, for Rydberg states, the main
contribution for the gravitational potential energy does not come from the rest
energy concentrated on the nucleus but from the energy of the electromagnetic
field created by its electrical charge, which is spread in space. The reason is
connected to the fact that, when the ion is in a Rydberg state with high
angular momentum, the gravitational potential energy is not computable in
zero-width brane approximation due to the gravitational influence of the
electrovacuum in which the lepton is moving. Considering a thick brane
scenario, we calculate the gravitational potential energy associated to the
nucleus charge in terms of the confinement parameter of the electric field in
the brane. We show that the gravitational effects on the energy levels of a
Rydberg state can be amplified by the extra dimensions even when the
compactification scale of the hidden dimensions is shorter than the Bohr
radius
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Number of Pages: 2Integrative BiologyGeological Science
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Xenosaurus grandis
Number of Pages: 4Integrative BiologyGeological Science
The Two-Dimensional Analogue of General Relativity
General Relativity in three or more dimensions can be obtained by taking the
limit in the Brans-Dicke theory. In two dimensions
General Relativity is an unacceptable theory. We show that the two-dimensional
closest analogue of General Relativity is a theory that also arises in the
limit of the two-dimensional Brans-Dicke theory.Comment: 8 pages, LaTeX, preprint DF/IST-17.9
O direito na perspectiva dos autores da sociologia clássica: Durkheim, Weber e Marx
Trata do Direito na perspectiva dos principais autores da Sociologia clássica. Analisa, de acordo com a visão de Durkheim, as influências da sociedade sobre o Direito e sua formação, a solidariedade social, os fatos sociais como o objeto da sociologia e suas caracterÃsticas. Discorre, conforme a concepção de Weber, o individualismo metodológico e os tipos de dominação na História. Expõe, conforme Marx, o Estado e o Direito como intermediários e o Direito como ideologia a serviço da exploração capitalista
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