Navegação por Assunto "Física estatística"
Resultados 21-31 de 31
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Modelo esférico quântico de vidro de spins com interação do tipo p-Spins
(2012) [Tese]Neste trabalho, apresentamos um estudo do modelo esférico quântico de vidro de spins com interação de troca entre p spins > 2). O modelo quântico é obtido através da quantização canônica do modelo clássico correspondente, ... -
Modelos exatamente solúveis para gases ultrafrios
(2012) [Tese]Modelos exatamente solúveis para gases de férmions e bósons ultrafrios são estudados via o método do ansatz de Bethe termodinâmico. Resultados analíticos e numéricos são obtidos para o gás de Fermi de duas componentes com ... -
Non-Gaussian distributions to random walk in the context of memory kernels
(2018) [Artigo de periódico]The investigation of diffusive process in nature presents a complexity associated with memory effects. Thereby, it is necessary new mathematical models to involve memory concept in diffusion. In the following, I approach ... -
Non-Shilnikov cascades of spikes and hubs in a semiconductor laser with optoelectronic feedback
(2010) [Artigo de periódico]Incomplete homoclinic scenarios were recently measured in a semiconductor laser with optoelectronic feedback. We show here that such a laser contains cascades of spirals of periodic oscillations and hubs which look identical ... -
Optimally adapted multistate neural networks trained with noise
(1999) [Artigo de periódico]The principle of adaptation in a noisy retrieval environment is extended here to a diluted attractor neural network of Q-state neurons trained with noisy data. The network is adapted to an appropriate noisy training overlap ... -
Phase diagrams of three-component attractive ultracold fermions in one dimension
(2012) [Artigo de periódico]We investigate trions, paired states and quantum phase transitions in one-dimensional SU(3) attractive fermions in external fields by means of the Bethe ansatz formalism. Analytical results for the ground state energy, ... -
Phase transitions in the three-state Ising spin-glass model with finite connectivity
(2011) [Artigo de periódico]The statistical mechanics of a two-state Ising spin-glass model with finite random connectivity, in which each site is connected to a finite number of other sites, is extended in this work within the replica technique to ... -
Renormalização e propriedades críticas do modelo de Potts contínuo com quebra externa de simetria
(1984) [Dissertação]A renormalização e o compartamento crítico da teoria de campo contínuo em o³ para o modelo de Potts de p estados com quebra externa de simetria entre os vetores de estado é investigada no presente trabalho. -
Sistemas extensos com dimensão instável invariante
(2005) [Dissertação]Neste trabalho nós investigamos as relações existentes entre a Variação de Dimensão Instável(Unstable Dimension Variability - UDV) e a dimensão do espaço de fases de uma rede de mapas acoplados com acoplamento difuso. damos ... -
Skepticism and rumor spreading : the role of spatial correlations
(2020) [Artigo de periódico]Critical thinking and skepticism are fundamental mechanisms that one may use to prevent the spreading of rumors, fake news, and misinformation. We consider a simple model in which agents without previous contact with the ... -
Statistical properties of speckle patterns for a random number of scatterers and nonuniform phase distributions
(2024) [Artigo de periódico]The statistical properties of speckle patterns have important applications in optics, oceanography, and transport phenomena in disordered systems. Here we obtain closed-form analytic results for the amplitude distribution ...