Metric Indefinite
Mostrando 1-3 de 3 artigos, teses e dissertações.
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1. Sobre as teorias de campos com métrica indefinida / On the field theory with indefinite metric
Estudamos duas classes de teorias de campos com métrica indefinida: os modelos sigma não linear não-compactos e as teorias quárticas da gravitação. Mostramos que a prova da unitariedade para os modelos sigma de simetria não compacta é a mesma que para os modelos compactos nas regiões fisicamente relevantes. Além disso, analisamos a possibilidade de
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/08/1992
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2. Characterizing harmonic immersions of surfaces with indefinite metric
Harmonic maps X:(S,h) → N from a 2-manifold S with indefinite metric h to a semi-Riemannian manifold N are characterized, assuming that the induced metric I is nondegenerate. Except in one very special case, the characterizations involve a canonically determined holomorphic quadratic differential on a naturally chosen conformal structure. This is surprisin
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3. Theory of deformable substrates for cell motility studies.
Linear theory is used to relate the tractions F applied by a cell to the resulting deformation of fluid, viscoelastic, or solid substrates. The theory is used to fit data in which the motion of a fluid surface in the neighborhood of a motile keratocyte is visualized with the aid of embedded beads. The data are best fit by modeling the surface layer as a two-