### Abstract

The Ising model on annealed complex networks with degree distribution decaying algebraically as $p(K)\sim K^{-\lambda}$ has a second-order phase transition at finite temperature if $\lambda>3$ . In the absence of space dimensionality, λ controls the transition strength; classical mean-field exponents apply for $\lambda >5$ but critical exponents are λ-dependent if $\lambda <5$ . Here we show that, as for regular lattices, the celebrated Lee-Yang circle theorem is obeyed for the former case. However, unlike on regular lattices where it is independent of dimensionality, the circle theorem fails on complex networks when $\lambda <5$ . We discuss the importance of this result for both theory and experiments on phase transitions and critical phenomena. We also investigate the finite-size scaling of Lee-Yang zeros in both regimes as well as the multiplicative logarithmic corrections which occur at $\lambda=5$ .

Original language | English |
---|---|

Journal | EPL |

Volume | 111 |

Issue number | 6 |

DOIs | |

Publication status | Published - 7 Oct 2015 |

## Fingerprint Dive into the research topics of 'Violation of Lee-Yang circle theorem for Ising phase transitions on complex networks'. Together they form a unique fingerprint.

## Cite this

Krasnytska, K., Berche, B., Holovatch, Y., & Kenna, R. (2015). Violation of Lee-Yang circle theorem for Ising phase transitions on complex networks.

*EPL*,*111*(6). https://doi.org/10.1209/0295-5075/111/60009