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Revista mexicana de física
Print version ISSN 0035-001X
Abstract
O' CONNOR, Denjoe; STEPHENS, C. R. and SANTIAGO, J. A.. Dimensional crossover in the non-linear sigma model. Rev. mex. fis. [online]. 2002, vol.48, n.4, pp.300-306. ISSN 0035-001X.
We consider dimensional crossover for an O(N) model on a d-dimensional layered geometry of thickness L, in the σ-model limit, using "environmentally friendly" renormalization. We show how to derive critical temperature shifts, giving explicit results to one loop. We also obtain expressions for the effective critical exponents δeff and βeff that interpolate between their characteristic fixed point values associated with a d and (d - 1)-dimensional system in the limits T - Tc(L), with L(T - Tc(L))v → ∞, and T - Tc(L) for L fixed respectively, where Tc(L) is the L-dependent critical temperature of the system.
Keywords : Renormalization group; dimensional crossover; critical phenomena; non-linear σ-model.