Navegação Ciências Exatas e da Terra por Assunto "Quebra de simetria"
Resultados 1-7 de 7
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Canonical ensemble approach to graded-response perceptrons
(1999) [Artigo de periódico]Perceptrons with graded input-output relations and a limited output precision are studied within the Gardner- Derrida canonical ensemble approach. Soft non-negative error measures are introduced allowing for extended ... -
Crossover exponents for the potts model with quadratic symmetry breaking
(1984) [Artigo de periódico]The effect of quadratic symmetry breaking (QSB) on two representations for the Potts vectors in a continuum-field model are studied to two-loop order in renormalized perturbation theory in d=6-E dimensions, in extension ... -
Effects of trilinear symmetry breaking on the Potts-model transition of uniaxially stressed SrTiO 3
(1986) [Artigo de periódico]A Landau analysis shows that a break of trilinear symmetry in the continuous three-state Potts model with linear and quadratic symmetry breaking is re1evant for the trigonal-to-pseudotetragonal phase transition in uniaxially ... -
Matter-antimatter asymmetry and non-inertial effects
(2021) [Artigo de periódico]We investigate non-inertial effects on CP-violating processes using a model, based on the framework of quantum field theory in curved spacetimes, devised to account for the decay of accelerated particles. We show that the ... -
Modulated systems in external fields : conditions for the presence of reentrant phase diagrams
(2016) [Artigo de periódico]We introduce a coarse-grained model capable of describing the phase behavior of two-dimensional ferromagnetic systems with competing exchange and dipolar interactions, as well as an external magnetic field. An improved ... -
Nonuniversality of ratios of critical and tricritical parameters in the three-state potts model with symmetry-breaking perturbations
(1988) [Artigo de periódico]Fluctuation corrections to symmetry-breaking perturbations are shown to yield nonuniversal ratios for te lt, hc Ih, and Me IM, between the reduced temperature t, magnetic field h, and magnetization M of the underlying XY ... -
Renormalization and phase transitions in Potts [fi]/sup 3/-field theory with quadratic and trilinear symmetry breaking
(1986) [Artigo de periódico]Renormalized perturbation theory with generalized minimal subtraction is used as an appropriate renormalization-group procedure for the study of crossover behavior in the continuum version of the p-state Potts model with ...