Navegação Ciências Exatas e da Terra por Assunto "Física estatística"
Resultados 1-16 de 16
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Classical and quantum analysis of a heterotriatomic molecular Bose-Einstein-condensate model
(2009) [Artigo de periódico]We investigate an integrable Hamiltonian modeling a heterotriatomic molecular Bose-Einstein condensate. This model describes a mixture of two species of atoms in different proportions, which can combine to form a triatomic ... -
Collisionless relaxation in gravitacional systems from violent relaxation to gravothermal collapse
(2008) [Artigo de periódico]Theory and simulations are used to study collisionless relaxation of a gravitational N-body system. It is shown that when the initial one-particle distribution function satisfies the virial condition—potential energy is ... -
A connection between the ice-type model of Linus Pauling and the three-color problem
(2021) [Artigo de periódico]The ice-type model proposed by Linus Pauling to explain its entropy at low temperatures is here approached in a didactic way. We first present a theoretically estimated low-temperature entropy and compare it with numerical ... -
Cooperation and age structure in spatial games
(2012) [Artigo de periódico]We study the evolution of cooperation in evolutionary spatial games when the payoff correlates with the increasing age of players (the level of correlation is set through a single parameter, α). The demographic heterogeneous ... -
Curvature-driven coarsening in the two-dimensional Potts model
(2010) [Artigo de periódico]We study the geometric properties of polymixtures after a sudden quench in temperature. We mimic these systems with the q-states Potts model on a square lattice with and without weak quenched disorder, and their evolution ... -
Driven one-component plasmas
(2009) [Artigo de periódico]A statistical theory is presented that allows the calculation of the stationary state achieved by a driven one-component plasma after a process of collisionless relaxation. The stationary Vlasov equation with appropriate ... -
Geometry of phase separation
(2009) [Artigo de periódico]We study the domain geometry during spinodal decomposition of a 50:50 binary mixture in two dimensions. Extending arguments developed to treat nonconserved coarsening, we obtain approximate analytic results for the ... -
Ising model with isotropic competing interactions in the presence of a field : a tricritical-lifshitz-point realization
(1993) [Artigo de periódico]We consider a spin system with competing interactions that are isotropic with respect to the axes of a cubic lattice. On the basis of an e expansion, we demonstrate that for small values of the external field H, the ... -
Maximal diversity and Zipf’s law
(2021) [Artigo de periódico]Zipf’s law describes the empirical size distribution of the components of many systems in natural and social sciences and humanities. We show, by solving a statistical model, that Zipf’s law co-occurs with the maximization ... -
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 ... -
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 ...
