作者: David R. Nelson , Robert A. Pelcovits
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摘要: We describe in detail how to construct momentum-shell recursion relations for classical fixed-length spins $d=2+\ensuremath{\epsilon}$ dimensions. The theory is then applied anisotropic spin systems and a model of nematic liquid crystals. also develop trajectory-integral formalism, which used produce the free energy, magnetization, susceptibilities isotropic first order $\ensuremath{\epsilon}=d\ensuremath{-}2$.