Journal of Physics Complexity最新文献_第4页

Higher-order connection Laplacians for directed simplicial complexes 有向简并复数的高阶连接拉普拉斯

IF 2.7

Journal of Physics Complexity Pub Date : 2024-03-28 DOI: 10.1088/2632-072x/ad353b

Xue Gong, Desmond J Higham, Konstantinos Zygalakis, Ginestra Bianconi

{"title":"Higher-order connection Laplacians for directed simplicial complexes","authors":"Xue Gong, Desmond J Higham, Konstantinos Zygalakis, Ginestra Bianconi","doi":"10.1088/2632-072x/ad353b","DOIUrl":"https://doi.org/10.1088/2632-072x/ad353b","url":null,"abstract":"Higher-order networks encode the many-body interactions existing in complex systems, such as the brain, protein complexes, and social interactions. Simplicial complexes are higher-order networks that allow a comprehensive investigation of the interplay between topology and dynamics. However, simplicial complexes have the limitation that they only capture undirected higher-order interactions while in real-world scenarios, often there is a need to introduce the direction of simplices, extending the popular notion of direction of edges. On graphs and networks the Magnetic Laplacian, a special case of connection Laplacian, is becoming a popular operator to address edge directionality. Here we tackle the challenge of handling directionality in simplicial complexes by formulating higher-order connection Laplacians taking into account the configurations induced by the simplices’ directions. Specifically, we define all the connection Laplacians of directed simplicial complexes of dimension two and we discuss the induced higher-order diffusion dynamics by considering instructive synthetic examples of simplicial complexes. The proposed higher-order diffusion processes can be adopted in real scenarios when we want to consider higher-order diffusion displaying non-trivial frustration effects due to conflicting directionalities of the incident simplices.","PeriodicalId":53211,"journal":{"name":"Journal of Physics Complexity","volume":"35 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140572522","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On the information-theoretic formulation of network participation 关于网络参与的信息论表述

IF 2.7

Journal of Physics Complexity Pub Date : 2024-03-27 DOI: 10.1088/2632-072x/ad32da

Pavle Cajic, Dominic Agius, Oliver M Cliff, James M Shine, Joseph T Lizier, Ben D Fulcher

引用次数: 0

Reconstructing supply networks 重建供应网络

IF 2.7

Journal of Physics Complexity Pub Date : 2024-03-25 DOI: 10.1088/2632-072x/ad30bf

Luca Mungo, Alexandra Brintrup, Diego Garlaschelli, François Lafond

引用次数: 0

Global synchronization on time-varying higher-order structures 时变高阶结构上的全局同步

IF 2.7

Journal of Physics Complexity Pub Date : 2024-03-21 DOI: 10.1088/2632-072x/ad3262

Md Sayeed Anwar, Dibakar Ghosh, Timoteo Carletti

引用次数: 0

Nonuniformly twisted states and traveling chimeras in a system of nonlocally coupled identical phase oscillators 非局部耦合相同相位振荡器系统中的非均匀扭曲态和旅行嵌合体

IF 2.7

Journal of Physics Complexity Pub Date : 2024-03-13 DOI: 10.1088/2632-072x/ad2ec2

L A Smirnov, M I Bolotov, A Pikovsky

引用次数: 0

Mobility restrictions in response to local epidemic outbreaks in rock-paper-scissors models 在 "剪刀石头布 "模型中应对地方流行病爆发的流动限制

IF 2.7

Journal of Physics Complexity Pub Date : 2024-03-08 DOI: 10.1088/2632-072x/ad2d5b

J Menezes

{"title":"Mobility restrictions in response to local epidemic outbreaks in rock-paper-scissors models","authors":"J Menezes","doi":"10.1088/2632-072x/ad2d5b","DOIUrl":"https://doi.org/10.1088/2632-072x/ad2d5b","url":null,"abstract":"We study a three-species cyclic model whose organisms are vulnerable to contamination with an infectious disease which propagates person-to-person. We consider that individuals of one species perform a self-preservation strategy by reducing the mobility rate to minimise infection risk whenever an epidemic outbreak reaches the neighbourhood. Running stochastic simulations, we quantify the changes in spatial patterns induced by unevenness in the cyclic game introduced by the mobility restriction strategy of organisms of one out of the species. Our findings show that variations in disease virulence impact the benefits of dispersal limitation reaction, with the relative reduction of the organisms’ infection risk accentuating in surges of less contagious or deadlier diseases. The effectiveness of the mobility restriction tactic depends on the deceleration level and the fraction of infected neighbours which is considered too dangerous, thus triggering the defensive strategy. If each organism promptly reacts to the arrival of the first viral vectors in its surroundings with strict mobility reduction, contamination risk decreases significantly. Our conclusions may help biologists understand the impact of defensive strategies in ecosystems during an epidemic.","PeriodicalId":53211,"journal":{"name":"Journal of Physics Complexity","volume":"6 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140312416","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Local sign stability and its implications for spectra of sparse random graphs and stability of ecosystems 局部符号稳定性及其对稀疏随机图谱和生态系统稳定性的影响

IF 2.7

Journal of Physics Complexity Pub Date : 2024-03-06 DOI: 10.1088/2632-072x/ad2698

Pietro Valigi, Izaak Neri, Chiara Cammarota

{"title":"Local sign stability and its implications for spectra of sparse random graphs and stability of ecosystems","authors":"Pietro Valigi, Izaak Neri, Chiara Cammarota","doi":"10.1088/2632-072x/ad2698","DOIUrl":"https://doi.org/10.1088/2632-072x/ad2698","url":null,"abstract":"We study the spectral properties of sparse random graphs with different topologies and type of interactions, and their implications on the stability of complex systems, with particular attention to ecosystems. Specifically, we focus on the behaviour of the leading eigenvalue in different type of random matrices (including interaction matrices and Jacobian-like matrices), relevant for the assessment of different types of dynamical stability. By comparing numerical results on Erdős–Rényi and Husimi graphs with sign-antisymmetric interactions or mixed sign patterns, we propose a sufficient criterion, called <italic toggle=\"yes\">strong local sign stability</italic>, for stability not to be affected by system size, as traditionally implied by the complexity-stability trade-off in conventional models of random matrices. The criterion requires sign-antisymmetric or unidirectional interactions and a local structure of the graph such that the number of cycles of finite length do not increase with the system size. Note that the last requirement is stronger than the classical local tree-like condition, which we associate to the less stringent definition of <italic toggle=\"yes\">local sign stability</italic>, also defined in the paper. In addition, for strong local sign stable graphs which show stability to linear perturbations irrespectively of system size, we observe that the leading eigenvalue can undergo a transition from being real to acquiring a nonnull imaginary part, which implies a dynamical transition from nonoscillatory to oscillatory linear response to perturbations. Lastly, we ascertain the discontinuous nature of this transition.","PeriodicalId":53211,"journal":{"name":"Journal of Physics Complexity","volume":"28 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140312298","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pathways to discontinuous transitions in interacting contagion dynamics 在相互作用的传染动力学中实现不连续转换的途径

IF 2.7

Journal of Physics Complexity Pub Date : 2024-02-28 DOI: 10.1088/2632-072x/ad269b

Santiago Lamata-Otín, Jesús Gómez-Gardeñes, David Soriano-Paños

引用次数: 0

Effects of topological structure and destination selection strategies on agent dynamics in complex networks 拓扑结构和目的地选择策略对复杂网络中代理动态的影响

IF 2.7

Journal of Physics Complexity Pub Date : 2024-02-23 DOI: 10.1088/2632-072x/ad2971

Satori Tsuzuki, Daichi Yanagisawa, Eri Itoh, Katsuhiro Nishinari

{"title":"Effects of topological structure and destination selection strategies on agent dynamics in complex networks","authors":"Satori Tsuzuki, Daichi Yanagisawa, Eri Itoh, Katsuhiro Nishinari","doi":"10.1088/2632-072x/ad2971","DOIUrl":"https://doi.org/10.1088/2632-072x/ad2971","url":null,"abstract":"We analyzed agent behavior in complex networks: Barabási–Albert, Erdos–Rényi, and Watts–Strogatz models under the following rules: agents (a) randomly select a destination among adjacent nodes; (b) exclude the most congested adjacent node as a potential destination and randomly select a destination among the remaining nodes; or (c) select the sparsest adjacent node as a destination. We focused on small complex networks with node degrees ranging from zero to a maximum of approximately 20 to study agent behavior in traffic and transportation networks. We measured the hunting rate, that is, the rate of change of agent amounts in each node per unit of time, and the imbalance of agent distribution among nodes. Our simulation study reveals that the topological structure of a network precisely determines agent distribution when agents perform full random walks; however, their destination selections alter the agent distribution. Notably, rule (c) makes hunting and imbalance rates significantly high compared with random walk cases (a) and (b), irrespective of network types, when the network has a high degree and high activity rate. Compared with the full random walk in (a) and (b) increases the hunting rate while decreasing the imbalance rate when activity is low; however, both increase when activity is high. These characteristics exhibit slight periodic undulations over time. Furthermore, our analysis shows that in the BA, ER, and WS network models, the hunting rate decreases and the imbalance rate increases when the system disconnects randomly selected nodes in simulations where agents follow rules (a)–(c) and the network has the ability to disconnect nodes within a certain time of all time steps. Our findings can be applied to various applications related to agent dynamics in complex networks.","PeriodicalId":53211,"journal":{"name":"Journal of Physics Complexity","volume":"14 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140011037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Transfer operators on graphs: spectral clustering and beyond 图上的转移算子：频谱聚类及其他

IF 2.7

Journal of Physics Complexity Pub Date : 2024-02-23 DOI: 10.1088/2632-072x/ad28fe

Stefan Klus, Maia Trower

引用次数: 0