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Extensions of the generalized hedgehog ansatz for the Einstein-nonlinear sigma-model system: black holes with NUT, black strings and time-dependent solutions
(2019)
We consider a class of ansatze for the construction of exact solutions of the Einstein-nonlinear sigma-model system with an arbitrary cosmological constant in (3+1) dimensions. Exploiting a geometric interplay between the ...
Cosmological taxonomy
(2019)
O Universo, sua origem e destino são uns dos mais relevantes tópicos que continuam desafiando a compreensão humana ao longo dos tempos. Desde uma pilha infinita de tartarugas, passando pela concepção da ação à distância ...
(Non)commutative isotropization in Bianchi i with barotropic perfect fluid and ? cosmological
(2014)
Shape measurements by sinusoidal phase-shifting methods require high-quality sinusoidal fringes. Furthermore, most of the video projectors are nonlinear, making it difficult to generate high quality phase without nonlinearity ...
Sobre la din�mica del universo preinflacionario anis�tropo
(1999)
The dynamics of anisotropic Bianchi type-IX model (Mixmaster Universe) with matter and cosmological constant is studied. The model can be considered as describing the preinflationary universe where the cosmological constant ...
Sobre la dinámica del universo preinflacionario anisótropo
(1999)
The dynamics of anisotropic Bianchi type-IX model (Mixmaster Universe) with matter and cosmological constant is studied. The model can be considered as describing the preinflationary universe where the cosmological constant ...
Minisuperspace example of non-Lagrangian quantization
(American Physical Society, 1992)
We present the construction of a Hamiltonian description for a (non-Lagrangian) Bianchi type-V cosmological model using the solutions of the equations of motion as a starting point. We study the quantization of the model ...
Software development effort estimation using fuzzy logic: A case STudy
(2004)
This paper presents some results on the analysis and design of rectangular planar arrays of antennas throw an extension of a software developed in MatLab. A general model for rectangular arrays is used and then it is ...