英文标题：
《Hysteresis of economic networks in an XY model》
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作者：
Ali Hosseiny, Mohammadreza Absalan, Mohammad Sherafati, Mauro
  Gallegati
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最新提交年份：
2018
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英文摘要：
  Many-body systems can have multiple equilibria. Though the energy of equilibria might be the same, still systems may resist to switch from an unfavored equilibrium to a favored one. In this paper we investigate occurrence of such phenomenon in economic networks. In times of crisis when governments intend to stimulate economy, a relevant question is on the proper size of stimulus bill. To address the answer, we emphasize the role of hysteresis in economic networks. In times of crises, firms and corporations cut their productions; now since their level of activity is correlated, metastable features in the network become prominent. This means that economic networks resist against the recovery actions. To measure the size of resistance in the network against recovery, we deploy the XY model. Though theoretically the XY model has no hysteresis, when it comes to the kinetic behavior in the deterministic regimes, we observe a dynamic hysteresis. We find that to overcome the hysteresis of the network, a minimum size of stimulation is needed for success. Our simulations show that as long as the networks are Watts-Strogatz, such minimum is independent of the characteristics of the networks.
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中文摘要：
许多身体系统可以有多重平衡。尽管平衡能量可能是相同的，但系统仍可能抵制从不利平衡切换到有利平衡。本文研究了这种现象在经济网络中的发生。在政府打算刺激经济的危机时期，一个相关的问题是刺激法案的适当规模。为了回答这个问题，我们强调了滞后在经济网络中的作用。在危机时期，公司和企业削减生产；现在，由于它们的活动水平是相关的，网络中的亚稳态特征变得突出。这意味着经济网络抵制复苏行动。为了测量网络中针对恢复的阻力大小，我们部署了XY模型。虽然理论上XY模型没有滞后，但当涉及确定性区域的动力学行为时，我们观察到动态滞后。我们发现，为了克服网络的滞后性，成功需要最小的刺激大小。我们的模拟表明，只要网络是Watts-Strogatz，这样的最小值与网络的特性无关。
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分类信息：

一级分类：Physics        物理学
二级分类：Physics and Society        物理学与社会
分类描述：Structure, dynamics and collective behavior of societies and groups (human or otherwise). Quantitative analysis of social networks and other complex networks. Physics and engineering of infrastructure and systems of broad societal impact (e.g., energy grids, transportation networks).
社会和团体（人类或其他）的结构、动态和集体行为。社会网络和其他复杂网络的定量分析。具有广泛社会影响的基础设施和系统（如能源网、运输网络）的物理和工程。
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一级分类：Physics        物理学
二级分类：Statistical Mechanics        统计力学
分类描述：Phase transitions, thermodynamics, field theory, non-equilibrium phenomena, renormalization group and scaling, integrable models, turbulence
相变，热力学，场论，非平衡现象，重整化群和标度，可积模型，湍流
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一级分类：Economics        经济学
二级分类：General Economics        一般经济学
分类描述：General methodological, applied, and empirical contributions to economics.
对经济学的一般方法、应用和经验贡献。
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一级分类：Quantitative Finance        数量金融学
二级分类：Economics        经济学
分类描述：q-fin.EC is an alias for econ.GN. Economics, including micro and macro economics, international economics, theory of the firm, labor economics, and other economic topics outside finance
q-fin.ec是econ.gn的别名。经济学，包括微观和宏观经济学、国际经济学、企业理论、劳动经济学和其他金融以外的经济专题
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