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Comment on 'Monte Carlo simulation study of the two-stage percolation transition in enhanced binary trees'

Seung Ki Baek1, Petter Minnhagen1 and Beom Jun Kim2

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COMMENTS AND REPLIES

The enhanced binary tree (EBT) is a nontransitive graph which has two percolation thresholds pc1 and pc2 with pc1 < pc2. Our Monte Carlo study implies that the second threshold pc2 is significantly lower than a recent claim by Nogawa and Hasegawa (2009 J. Phys. A: Math. Theor. 42 145001). This means that pc2 for the EBT does not obey the duality relation for the thresholds of dual graphs p_{c2}+\overline{p}_{c1}=1 which is a property of a transitive, nonamenable, planar graph with one end. As in regular hyperbolic lattices, this relation instead becomes an inequality p_{c2}+\overline{p}_{c1}<1 . We also find that the critical behavior is well described by the scaling form previously found for regular hyperbolic lattices.


PACS

05.50.+q Lattice theory and statistics (Ising, Potts, etc.)

02.10.Ox Combinatorics; graph theory

05.70.Fh Phase transitions: general studies

MSC

05C05 Trees

82B26 Phase transitions (general)

82B43 Percolation (See also 60K35)

82B80 Numerical methods (Monte Carlo, series resummation, etc.) (See also 65-XX, 81T80)

82B27 Critical phenomena

Subjects

Mathematical physics

Statistical physics and nonlinear systems

Dates

Issue 47 (27 November 2009)

Received 8 May 2009

Published 4 November 2009



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