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Mostrando ítems 961-970 de 1092
Quotient p-Schatten metrics on spheres
(Unión Matemática Argentina, 2017-04)
Let S(H) be the unit sphere of a Hilbert space H and Up(H) thegroup of unitary operators in H such that u−1 belongs to the p-Schatten idealBp(H). This group acts smoothly and transitively in S(H) and endows it witha natural ...
Ultimate bound minimisation by state feedback in discrete-time switched linear systems under arbitrary switching
(Elsevier, 2016-08)
We present a novel state feedback design method for perturbed discrete-time switched linear systems. The method aims at achieving (a) closed-loop stability under arbitrary switching and (b) minimisation of ultimate bounds ...
Optimal Paths for Symmetric Actions in the Unitary Group
(Springer, 2014-06)
Given a positive and unitarily invariant Lagrangian L defined in the algebra of matrices, and a fixed time interval [0, t0 ] ⊂ ℝ, we study the action defined in the Lie group of n × n unitary matrices U(n) by, where α: [0, ...
Função de Wigner, quasi-amplitudes de probabilidades e sistemas dissipativos
(2015-04-15)
Neste trabalho, explorando o conceito de grupo de Galilei, é deduzida uma teoria de representação para a mecânica quântica simplética consistente com o método da função de Wigner. É construído um espaço de Hilbert com uma ...
Covariância galileana e representações de spin ½
(2020-03-11)
Nesta dissertação, explorando o conceito do grupo estendido Galilei, uma representação para a mecânica quântica simplética na variedade G é derivada consistentemente com o método da função Wigner. Um espaço de Hilbert é ...
A possible hypercomputational quantum algorithm
(SPIE-INT SOC OPTICAL ENGINEERING, 2005-01-01)
The term `hypermachine' denotes any data processing device (theoretical or that can be implemented) capable of carrying out tasks that cannot be performed by a Turing machine. We present a possible quantum algorithm for a ...
Jensen's inequality for spectral order and submajorization
(Academic Press Inc Elsevier Science, 2007-07)
Let A be a C*-algebra and φ{symbol} : A → L (H) be a positive unital map. Then, for a convex function f : I → R defined on some open interval and a self-adjoint element a ∈ A whose spectrum lies in I, we obtain a Jensen's-type ...
Affine Killing vector fields on homogeneous surfaces with torsion
(IOP Publishing, 2019-06)
Many extensions of General Relativity are based on considering metric and affine structures as independent properties of spacetime. This leads to the possibility of introducing torsion as an independent degree ...
Development and applications of three-dimensional gamma ray tomography system using ray casting volume rendering techniques
(Sociedade Brasileira de Física, 2005-09-01)
Computed Tomography (CT) has made possible visualization of physical structures in the interior of an object in their real relative spatial position and orientation. Another important contribution of CT is to greatly improve ...
O teste de Painlevé e a integrabilidade do modelo generalizado de sine-Gordon
(Universidade Federal de Mato GrossoBrasilInstituto de Física (IF)UFMT CUC - CuiabáPrograma de Pós-Graduação em Física, 2014-02-07)
In this work the integrability of the generalized sine-Gordon model (GsG) is examined
in the context of the Painlevé test for partial di erential equations (PDEs). We show
that the (GsG) model possesses certain submodels ...