Critical exponents from parallel plate geometries subject to periodic and antiperiodic boundary conditions

Details Critical exponents from parallel plate geometries subject to periodic and antiperiodic boundary conditions Critical exponents from parallel plate geometries subject to periodic and antiperiodic boundary conditions

2011-03-08

arxiv.org/abs/1103.1661v2

Physics

Condensed Matter

Statistical Mechanics

Modified introduction and some references; new crossover regimes discussion improved; Appendixes expanded. 48 pages, no figure

Scientific paper

We introduce a renormalized 1PI vertex part scalar field theory setting in momentum space to computing the critical exponents $\nu$ and $\eta$, at least at two-loop order, for a layered parallel plate geometry separated by a distance L, with periodic as well as antiperiodic boundary conditions on the plates. We utilize massive and massless fields in order to extract the exponents in independent ultraviolet and infrared scaling analysis, respectively, which are required in a complete description of the scaling regions for finite size systems. We prove that fixed points and other critical amounts either in the ultraviolet or in the infrared regime dependent on the plates boundary condition are a general feature of normalization conditions. We introduce a new description of typical crossover regimes occurring in finite size systems. Avoiding these crossovers, the three regions of finite size scaling present for each of these boundary conditions are shown to be indistinguishable in the results of the exponents in periodic and antiperiodic conditions, which coincide with those from the (bulk) infinite system.

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