207 research outputs found
Dynamical linke cluster expansions: Algorithmic aspects and applications
Dynamical linked cluster expansions are linked cluster expansions with
hopping parameter terms endowed with their own dynamics. They amount to a
generalization of series expansions from 2-point to point-link-point
interactions. We outline an associated multiple-line graph theory involving
extended notions of connectivity and indicate an algorithmic implementation of
graphs. Fields of applications are SU(N) gauge Higgs systems within variational
estimates, spin glasses and partially annealed neural networks. We present
results for the critical line in an SU(2) gauge Higgs model for the electroweak
phase transition. The results agree well with corresponding high precision
Monte Carlo results.Comment: LATTICE98(algorithms
Functional Complexity Measure for Networks
We propose a complexity measure which addresses the functional flexibility of
networks. It is conjectured that the functional flexibility is reflected in the
topological diversity of the assigned graphs, resulting from a resolution of
their vertices and a rewiring of their edges under certain constraints. The
application will be a classification of networks in artificial or biological
systems, where functionality plays a central role.Comment: 11 pages, LaTeX2e, 5 PostScript figure
Catastrophic senescence of the Pacific salmon without mutation-accumulation
We derive catastrophic senescence of the Pacific salmon from an aging model
which was recently proposed by Stauffer. The model is based on the postulates
of a minimum reproduction age and a maximal genetic lifespan. It allows for
self-organization of a typical age of first reproduction and a typical age of
death. Our Monte Carlo simulations of the population dynamics show that the
model leads to catastrophic senescence for semelparous reproduction as it
occurs in the case of salmon, but to a more gradually increase of senescence
for iteroparous reproduction.Comment: 7 pages, latex2e, 2 postscript figures, to be published in Int. J.
Mod. Phys. C12(3) 200
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