Featured in EPL
Recent highlights from EPL:
Demographic noise can lead to the spontaneous formation of species1
by T. Rogers, A. J. McKane and A. G. Rossberg
“When a collection of phenotypically diverse organisms compete with each other for limited resources, the population can evolve into tightly localised clusters. Past studies have neglected the effects of demographic noise and studied the population on a macroscopic scale, where cluster formation is found to depend on the shape of the curve describing the decline of competition strength with phenotypic distance. Here we show how including the effects of demographic noise leads to a radically different conclusion. Two situations are identified: a weak-noise regime in which the population exhibits patterns of fluctuation around the macroscopic description, and a strong-noise regime where clusters appear spontaneously even in the case that all organisms have equal fitness…”
Fluctuations, linear response and heat flux of an aging system2
by J. R. Gomez-Solano, A. Petrosyan and S. Ciliberto
“We measure the fluctuations of the position of a Brownian particle confined by an optical trap in an aging gelatin droplet after a fast quench. Its linear response to an external perturbation is also measured. We compute the spontaneous heat flux from the particle to the bath due to the non-equilibrium formation of the gel. We show that the mean heat flux is quantitatively related to the violation of the equilibrium fluctuation-dissipation theorem as a measure of the broken detailed balance during the aging process…”
The game of go as a complex network3
by B. Georgeot and O. Giraud
“We study the game of go from a complex network perspective. We construct a directed network using a suitable definition of tactical moves including local patterns, and study this network for different datasets of professional and amateur games. The move distribution follows Zipf’s law and the network is scale free, with statistical peculiarities different from other real directed networks, such as, e.g., the World Wide Web. These specificities reflect in the outcome of ranking algorithms applied to it. The fine study of the eigenvalues and eigenvectors of matrices used by the ranking algorithms singles out certain strategic situations. Our results should pave the way to a better modelization of board games and other types of human strategic scheming…”
- Rogers, T., McKane, A. J., & Rossberg, A. G. (2012-02-21) Demographic noise can lead to the spontaneous formation of species. EPL (Europhysics Letters), 4(4), 1. DOI: 10.1209/0295-5075/97/40008 [↩]
- Gomez-Solano, J. R. (2012-04-05) Fluctuations, linear response and heat flux of an aging system. EPL (Europhysics Letters), 84(1), 20006. DOI: 10.1209/0295-5075/98/10007 [↩]
- Georgeot, B. (2012-03-13) The game of go as a complex network. EPL (Europhysics Letters), 97(6), 68002. DOI: 10.1209/0295-5075/97/68002 [↩]
