10 research outputs found
Fermion Pairing Dynamics in the Relativistic Scalar Plasma
Using many-body techniques we obtain the time-dependent Gaussian
approximation for interacting fermion-scalar field models. This method is
applied to an uniform system of relativistic spin-1/2 fermion field coupled,
through a Yukawa term, to a scalar field in 3+1 dimensions, the so-called
quantum scalar plasma model. The renormalization for the resulting Gaussian
mean-field equations, both static and dynamical, are examined and initial
conditions discussed. We also investigate solutions for the gap equation and
show that the energy density has a single minimum.Comment: 21 pages, latex, 4 postscript figures, new sections, some literary
changes, notation corrections, accepted for publication in Phys. Rev
O fenômeno de quebra de simetria no modelo do oscilador anarmônico
Neste artigo, descrevemos através de uma técnica não-perturbativa o problema de condição inicial, no contexto da Mecânica Quântica, de um sistema fermiônico autointeragente fora do equilÃbrio na presença de um campo magnético. Em particular, no regime de campo médio, estudamos o fenômeno de quebra dinâmica de simetrias neste sistema, identificando os processos fÃsicos associados