Journal of Physics Complexity最新文献_第4页

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

Strength of minority ties: the role of homophily and group composition in a weighted social network 少数群体联系的强度：加权社会网络中同亲关系和群体构成的作用

IF 2.7

Journal of Physics Complexity Pub Date : 2024-02-16 DOI: 10.1088/2632-072x/ad2720

José R Nicolás-Carlock, Denis Boyer, Sandra E Smith-Aguilar, Gabriel Ramos-Fernández

{"title":"Strength of minority ties: the role of homophily and group composition in a weighted social network","authors":"José R Nicolás-Carlock, Denis Boyer, Sandra E Smith-Aguilar, Gabriel Ramos-Fernández","doi":"10.1088/2632-072x/ad2720","DOIUrl":"https://doi.org/10.1088/2632-072x/ad2720","url":null,"abstract":"Homophily describes a fundamental tie-formation mechanism in social networks in which connections between similar nodes occur at a higher rate than among dissimilar ones. In this article, we present an extension of the weighted social network (WSN) model that, under an explicit homophily principle, quantifies the emergence of attribute-dependent properties of a social system. To test our model, we make use of empirical association data of a group of free-ranging spider monkeys in Yucatan, Mexico. Our homophilic WSN model reproduces many of the properties of the empirical association network with statistical significance, specifically, the average weight of sex-dependent interactions (female-female, female-male, male-male), the weight distribution function, as well as many weighted macro properties (node strength, weighted clustering, and weighted number of modules), even for different age group combinations (adults, subadults, and juveniles). Furthermore, by performing simulations with fitted parameters, we show that one of the main features of a spider monkey social system, namely, stronger male-male interactions over female-female or female-male ones, can be accounted for by an asymmetry in the node-type composition of a bipartisan network, independently of group size. The reinforcement of connections among members of minority groups could be a general structuring mechanism in homophilic social networks.","PeriodicalId":53211,"journal":{"name":"Journal of Physics Complexity","volume":"15 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140011039","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

The complexity of climate change mitigation: an experiment with large groups 减缓气候变化的复杂性：大型团体实验

IF 2.7

Journal of Physics Complexity Pub Date : 2024-02-14 DOI: 10.1088/2632-072x/ad2372

Antonio Alfonso, Pablo Brañas-Garza, Antonio Cabrales, Angel Sánchez

{"title":"The complexity of climate change mitigation: an experiment with large groups","authors":"Antonio Alfonso, Pablo Brañas-Garza, Antonio Cabrales, Angel Sánchez","doi":"10.1088/2632-072x/ad2372","DOIUrl":"https://doi.org/10.1088/2632-072x/ad2372","url":null,"abstract":"We have studied the problem of climate change mitigation in large groups by means of a series of experiments with 1785 people. Our participants included both young university students and people of relevance in different organizations, in particular, those attending the presentation of the annual report on innovation by Fundación COTEC (Spain). In the experiment, the participants, distributed in groups of more than 100 people, faced a dilemma: to avoid a global catastrophe that destroys any possibility of making profits, a certain collective sacrifice has to be made by contributing to reach a global threshold. When the threshold was low, the students reached the amount of overall contribution necessary to avoid it. But in the case of a high threshold, none of the populations reached the threshold. In fact, they were far from it. In this sense, the collective behavior of the students and of people of relevance was fundamentally the same. The majority of participants in the high-risk case fell into four categories: those who did not contribute (around 10%), those who contribute half of their means (15%) but less than the fair share required to reach the threshold, those who contributed the fair share (10%), and those who contributed everything they had, so that their personal benefit was zero. In the case of students this last percentage was 10%, but in the other sample it reached almost 30%. We also found that individuals could be classified as being optimistic or pessimistic, and in general they behaved accordingly with regard to their contributions. Our results highlight the complexity of mitigating climate change in large groups and specially the difficulty in communicating the issue to foster action in a general population.","PeriodicalId":53211,"journal":{"name":"Journal of Physics Complexity","volume":"141 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140011032","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

Filtering higher-order datasets 筛选高阶数据集

IF 2.7

Journal of Physics Complexity Pub Date : 2024-02-13 DOI: 10.1088/2632-072x/ad253a

Nicholas W Landry, Ilya Amburg, Mirah Shi, Sinan G Aksoy

引用次数: 0