The scaling region of the lattice O(N) sigma model at finite temperature

Details The scaling region of the lattice O(N) sigma model at finite temperature The scaling region of the lattice O(N) sigma model at finite temperature

2002-12-30

arxiv.org/abs/hep-lat/0212040v3

JHEP 0302 (2003) 034

Physics

High Energy Physics

High Energy Physics - Lattice

17 pages, 7 figures

Scientific paper

10.1088/1126-6708/2003/02/034

We present results from numerical studies of the finite temperature phase transition of the $(3+1)d$ O(N)-symmetric non-linear sigma model for $N=1,2$ and 3. We study the dependence of the width of the 3d critical region on $N$ and we show that the broken phase scaling region is much wider for N=2 and 3 than for N=1. We also compare the widths of the critical region in the low $T$ and high $T$ phases of the O(2) model and we show that the scaling region in the broken phase is much wider than in the symmetric phase. We also report results for the width of the scaling regions in the low $T$ phase$ (2+1)d$ Ising model and we show that the spatial correlation length has to be approximately twice the lattice temporal extent before the 2d scaling region is reached.

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