Nonsymmetric Interactions Trigger Collective Swings in Globally Ordered Systems

被引：13

作者：

Cavagna, Andrea ^{[1
,2
]}

Giardina, Irene ^{[1
,2
,3
]}

Jelic, Asja ^{[1
,2
,4
]}

Melillo, Stefania ^{[1
,2
]}

Parisi, Leonardo ^{[1
,2
,5
]}

Silvestri, Edmondo ^{[1
,6
]}

Viale, Massimiliano ^{[1
,2
]}

机构：

[1] UOS Sapienza, CNR, Ist Sistemi Complessi, I-00185 Rome, Italy

[2] Univ Sapienza, Dipartimento Fis, I-00185 Rome, Italy

[3] Ist Nazl Fis Nucl, Unita Roma 1, I-00185 Rome, Italy

[4] Abdus Salam Int Ctr Theoret Phys, Str Costiera 11, I-34014 Trieste, Italy

[5] Univ Sapienza, Dipartimento Informat, I-00185 Rome, Italy

[6] Univ Roma 3, Dipartimento Fis, I-00146 Rome, Italy

来源：

PHYSICAL REVIEW LETTERS | 2017年 / 118卷 / 13期

关键词：

INFORMATION-TRANSFER; NATURAL FLOCKS; BEHAVIOR; LOCALIZATION; NETWORKS;

D O I：

10.1103/PhysRevLett.118.138003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Many systems in nature, from ferromagnets to flocks of birds, exhibit ordering phenomena on the large scale. In condensed matter systems, order is statistically robust for large enough dimensions, with relative fluctuations due to noise vanishing with system size. Several biological systems, however, are less stable and spontaneously change their global state on relatively short time scales. Here we show that there are two crucial ingredients in these systems that enhance the effect of noise, leading to collective changes of state on finite time scales and off-equilibrium behavior: the nonsymmetric nature of interactions between individuals, and the presence of local heterogeneities in the topology of the network. Our results might explain what is observed in several living systems and are consistent with recent experimental data on bird flocks and other animal groups.

引用

页数：5

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