Results 31 to 40 of about 678,025 (58)

A study of gravitational collapse with decaying of the vacuum energy [PDF]

arXiv, 2006
We study the gravitational collapse of a dust dark matter star in a $\Lambda$-background. We consider two distinct cases: First we do not have a dark matter and dark energy coupling; second, we consider that $\Lambda $ decay in dark particles. The approach adopted assumes a modified matter expansion rate and we have formation of a black hole, since ...
arxiv  

Observational consequences of a dark interaction model [PDF]

Braz.J.Phys.40:398,2010, 2009
We study a model with decay of dark energy and creation of the dark matter particles. We integrate the field equations and find the transition redshift where the evolution process of the universe change the accelerated expansion, and discuss the luminosity distance, acoustic oscillations and the statefinder parameters.
arxiv  

Momentum-based gradient descent methods for Lie groups [PDF]

arXiv
Polyak's Heavy Ball (PHB; Polyak, 1964), a.k.a. Classical Momentum, and Nesterov's Accelerated Gradient (NAG; Nesterov, 1983) are well know examples of momentum-descent methods for optimization. While the latter outperforms the former, solely generalizations of PHB-like methods to nonlinear spaces have been described in the literature.
arxiv  

Belief Updating and Learning in Semi-Qualitative Probabilistic Networks [PDF]

arXiv, 2012
This paper explores semi-qualitative probabilistic networks (SQPNs) that combine numeric and qualitative information. We first show that exact inferences with SQPNs are NPPP-Complete. We then show that existing qualitative relations in SQPNs (plus probabilistic logic and imprecise assessments) can be dealt effectively through multilinear programming ...
arxiv  

El teorema de Dirichlet, la conjetura de Goldbach y algunas consecuencias [PDF]

arXiv, 2012
In this article we study in depth the Dirichlet theorem, which states that if a, b are relative prime integers, the sequence p = an + b contains infinite prime numbers, we simplify and generalize this theorem, we enunciate some special theorems (from Elias), we see equivalence with Bertrand's postulate and we deduce the validity of the Goldbach ...
arxiv  

Algorithms for Learning Decomposable Models and Chordal Graphs [PDF]

arXiv, 2013
Decomposable dependency models and their graphical counterparts, i.e., chordal graphs, possess a number of interesting and useful properties. On the basis of two characterizations of decomposable models in terms of independence relationships, we develop an exact algorithm for recovering the chordal graphical representation of any given decomposable ...
arxiv  

Spin-1 Particles with Light-Front Approach [PDF]

EPJ Web Conf. 73 (2014) 03017 ( http://dx.doi.org/10.1051/epjconf/20147303017 ), 2015
For the vector sector, i.e, mesons with spin-1, the electromagnetic form factors and anothers observables are calculated with the light-front approach. However, the light-front quantum field theory have some problems, for example, the rotational symmetry breaking.
arxiv  

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Estudos de Onomástica Galega III. Os alcumes

, 2018
Os alcumes constituen unha parte importante da antroponimia non oficial, ainda que, igual cos apelidos, estan ligados a familia e adoitan transmitirse de xeracion en xeracion.
Ana Isabel Boullón Agrelo
semanticscholar   +1 more source

Análise das unidades fraseolóxicas de Fénix desde unha perspectiva intercultural entre a China e España

Cadernos de Fraseoloxía galega
Numerosos investigadores e investigadoras levaron a cabo estudos fraseolóxicos comparativos entre o chinés e o español, sendo a zoonimia un dos temas máis prominentes no ámbito.
Yu Liang
semanticscholar   +1 more source

Unha literatura de nación sen Estado

, 2015
Este traballo esta escrito dende o campo da estetica e o que pretende e abrir unha reflexion sobre o feito de que a literatura galega se desenvolve nun territorio sen nacion-Estado.
Silvia Bardelás Álvarez
semanticscholar   +1 more source