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Preferential attachment renders an evolving network of populations robust against crashes

Samal, Areejit; Meyer-Ortmanns, Hildegard - In: Physica A: Statistical Mechanics and its Applications 388 (2009) 8, pp. 1535-1545

, and a selection mechanism on a longer time scale. Least fit nodes are replaced by new nodes whose links are attached to …

Persistent link: https://www.econbiz.de/10010874712

Correlations, risk and crisis: From physiology to finance

Gorban, Alexander N.; Smirnova, Elena V.; Tyukina, … - In: Physica A: Statistical Mechanics and its Applications 389 (2010) 16, pp. 3193-3217

We study the dynamics of correlation and variance in systems under the load of environmental factors. A universal effect in ensembles of similar systems under the load of similar factors is described: in crisis, typically, even before obvious symptoms of crisis appear, correlation increases,...

Persistent link: https://www.econbiz.de/10010871731

Optimization of gene sequences under constant mutational pressure and selection

Kowalczuk, M.; Gierlik, A.; Mackiewicz, P.; Cebrat, S.; … - In: Physica A: Statistical Mechanics and its Applications 273 (1999) 1, pp. 116-131

We have analyzed the influence of constant mutational pressure and selection on the nucleotide composition of DNA …

Persistent link: https://www.econbiz.de/10010872032

Large deviations, metastability and selection

Kurchan, Jorge - In: Physica A: Statistical Mechanics and its Applications 418 (2015) C, pp. 170-188

In this note I introduce some techniques to treat systems in contact with (stochastic) thermal baths. The methods and the level of rigour are those of theoretical physics.

Persistent link: https://www.econbiz.de/10011077830

Ultrametricity in fund of funds diversification

Miceli, M.A.; Susinno, G. - In: Physica A: Statistical Mechanics and its Applications 344 (2004) 1, pp. 95-99

Minimum market transparency requirements impose hedge fund (HF) managers to use the statement declared strategy in practice. However, each declared strategy may actually generate a multiplicity of implemented management decisions. Is then the “actual ” strategy the same as the...

Persistent link: https://www.econbiz.de/10011063884

Balancing the competing demands of harvesting and safety from predation: Lévy walk searches outperform composite Brownian walk searches but only when foraging under the risk of pre...

Reynolds, A.M. - In: Physica A: Statistical Mechanics and its Applications 389 (2010) 21, pp. 4740-4746

Some foragers have movement patterns that can be approximated by Lévy walks whilst others may be better represented as composite Brownian walks. Many attempts have been made to interpret these movement patterns in terms of optimal searching strategies for the location of randomly and sparsely...

Persistent link: https://www.econbiz.de/10010872979

Economic dynamics with financial fragility and mean-field interaction: A model

Di Guilmi, C.; Gallegati, M.; Landini, S. - In: Physica A: Statistical Mechanics and its Applications 387 (2008) 15, pp. 3852-3861

Following Aoki’s statistical mechanics methodology [Masanao Aoki, New Approaches to Macroeconomic Modeling, Cambridge University Press, 1996; Masanao Aoki, Modeling Aggregate Behaviour and Fluctuations in Economics, Cambridge University Press, 2002; Masanao Aoki, and Hiroshi Yoshikawa, Reconstructing...

Persistent link: https://www.econbiz.de/10010873209

On synchronizability and heterogeneity in unweighted networks

Hao, Binbin; Yu, Hao; Jing, Yuanwei; Zhang, Siying - In: Physica A: Statistical Mechanics and its Applications 388 (2009) 9, pp. 1939-1945

density and heterogeneity in degree distribution. In this work, it will be shown that synchronizability of Type I networks is … independent of heterogeneity in the degree distribution when the link density is smaller than 0.02. Synchronizability and link … density are proportional. When the link density is larger than 0.025, heterogeneity decides the curve slope. The …

Persistent link: https://www.econbiz.de/10010873403

Promotion of cooperation induced by the interplay between structure and game dynamics

Fu, Feng; Chen, Xiaojie; Liu, Lianghuan; Wang, Long - In: Physica A: Statistical Mechanics and its Applications 383 (2007) 2, pp. 651-659

heterogeneity and disassortative mixing pattern. For a given average connectivity of the population and the number of rounds, there … defectors. Besides, the effects of the average degree, the number of rounds, and the intensity of selection are investigated by …

Persistent link: https://www.econbiz.de/10010873458

Generalized synchronization in complex dynamical networks via adaptive couplings

Liu, Hui; Chen, Juan; Lu, Jun-an; Cao, Ming - In: Physica A: Statistical Mechanics and its Applications 389 (2010) 8, pp. 1759-1770

connection degree. Finally, we discuss in detail how a network’s degree of heterogeneity affects its generalization …

Persistent link: https://www.econbiz.de/10010873730