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Power spectra of self-organized critical sandpiles
Lasse Laurson, Mikko J. Alava, Stefano Zapperi
We analyze the power spectra of avalanches in two classes of self-organized critical sandpile models, the Bak-Tang-Wiesenfeld model and the Manna model. We show that these decay wi…
Is demagnetization an efficient optimization method?
S. Zapperi, F. Colaiori, L. Dante +4
Demagnetization, commonly employed to study ferromagnets, has been proposed as the basis for an optimization tool, a method to find the ground state of a disordered system. Here we…
Focused Local Search for Random 3-Satisfiability
Sakari Seitz, Mikko Alava, Pekka Orponen
A local search algorithm solving an NP-complete optimisation problem can be viewed as a stochastic process moving in an 'energy landscape' towards eventually finding an optimal sol…
Host--parasite models on graphs
Matti Peltomaki, Ville Vuorinen, Mikko Alava +1
The behavior of two interacting populations, ``hosts''and ``parasites'', is investigated on Cayley trees and scale-free networks. In the former case analytical and numerical argume…