Critical behaviour of the Ising model on the 4-dimensional lattice

Details Critical behaviour of the Ising model on the 4-dimensional lattice Critical behaviour of the Ising model on the 4-dimensional lattice

2012-02-14

arxiv.org/abs/1202.3031v1

Physical Review E 80, 031104 (2009)

Physics

Condensed Matter

Statistical Mechanics

5 pages, 7 figures

Scientific paper

10.1103/PhysRevE.80.031104

In this paper we investigate the nature of the singularity of the Ising model of the 4-dimensional cubic lattice. It is rigorously known that the specific heat has critical exponent $\alpha=0$ but a non-rigorous field-theory argument predicts an unbounded specific heat with a logarithmic singularity at $T_c$. We find that within the given accuracy the canonical ensemble data is consistent both with a logarithmic singularity and a bounded specific heat, but that the micro-canonical ensemble lends stronger support to a bounded specific heat. Our conclusion is that either much larger system sizes are needed for Monte Carlo studies of this model in four dimensions or the field theory prediction of a logarithmic singularity is wrong.

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