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Complexity Digest's Blog

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Simplicial models of social contagion

June 7, 2019 Comments (0)

Complex networks have been successfully used to describe the spread of diseases in populations of interacting individuals. Conversely, pairwise interactions are often not enough to characterize social contagion processes such as opinion formation or the adoption of novelties, where complex mechanisms of influence and reinforcement are at work. Here we introduce a higher-order model of social contagion in which a social system is represented by a simplicial complex and contagion can occur...

Proceedings A Special Feature: A Generation of Network Science. Call for papers

June 7, 2019 Comments (0)

On the eve of 20th century, three papers launched the modern Network Science by bringing it to the attention of a wider community of physicists, computer scientists and applied mathematicians. The papers – by Watts and Strogatz [1], Barabasi and Albert [2], and Google founders Brin and Page [3] – introduced “small world networks”, “preferential attachment,” and “PageRank” into the vernacular of network scientists. They showed that simple models could reproduce much of the complexity...

An Overview of Open-Ended Evolution: Editorial Introduction to the Open-Ended Evolution II Special Issue

June 4, 2019 Comments (0)

Nature’s spectacular inventiveness, reflected in the enormous diversity of form and function displayed by the biosphere, is a feature of life that distinguishes living most strongly from nonliving. It is, therefore, not surprising that this aspect of life should become a central focus of artificial life. We have known since Darwin that the diversity is produced dynamically, through the process of evolution; this has led life’s creative productivity to be called Open-Ended Evolution...

Worlds Hidden in Plain Sight

June 2, 2019 Comments (0)

Over the last three decades, the Santa Fe Institute and its network of researchers have been pursuing a revolution in science. Ignoring the boundaries of disciplines and schools and searching for novel fundamental ideas, theories, and practices, this international community integrates the full range of scientific inquiries that will help us to understand and survive on a complex planet. This volume collects essays from the past thirty years of research, in which contributors explain in clear...

What is the Entropy of a Social Organization?

June 1, 2019 Comments (0)

We quantify a social organization’s potentiality, that is its ability to attain different configurations. The organization is represented as a network in which nodes correspond to individuals and (multi-)edges to their multiple interactions. Attainable configurations are treated as realizations from a network ensemble. To encode interaction preferences between individuals, we choose the generalized hypergeometric ensemble of random graphs, which is described by a closed-form probability...

Ancient DNA Yields Clues to Past Biodiversity

May 31, 2019 Comments (0)

Surviving fragments of genetic material preserved in sediments allow metagenomics researchers to see the full diversity of past life — even microbes. Source: www.quantamagazine.org

Scientific discovery in a model-centric framework: Reproducibility, innovation, and epistemic diversity

May 30, 2019 Comments (0)

Consistent confirmations obtained independently of each other lend credibility to a scientific result. We refer to results satisfying this consistency as reproducible and assume that reproducibility is a desirable property of scientific discovery. Yet seemingly science also progresses despite irreproducible results, indicating that the relationship between reproducibility and other desirable properties of scientific discovery is not well understood. These properties include early discovery of...

A Quantum Router for the Entangled Web

May 30, 2019 Comments (0)

Qubit transmission protocols are presently point-to-point, and thus restrictive in their functionality. A quantum router is necessary for the quantum Internet to become a reality. We present a quantum router design based on teleportation, as well as mechanisms for entangled pair management. The prototype was validated using a quantum simulator.   A Quantum Router for the Entangled WebBernardo A. Huberman, Bob Lund Source: arxiv.org

Scale-free networks revealed from finite-size scaling

May 29, 2019 Comments (0)

Networks play a vital role in the development of predictive models of physical, biological, and social collective phenomena. A quite remarkable feature of many of these networks is that they are believed to be approximately scale free: the fraction of nodes with k incident links (the degree) follows a power law p(k)∝k−λ for sufficiently large degree k. The value of the exponent λ as well as deviations from power law scaling provide invaluable information on the mechanisms underlying the...

Reconciling cooperation, biodiversity and stability in complex ecological communities

May 29, 2019 Comments (0)

Empirical evidences show that ecosystems with high biodiversity can persist in time even in the presence of few types of resources and are more stable than low biodiverse communities. This evidence is contrasted by the conventional mathematical modeling, which predicts that the presence of many species and/or cooperative interactions are detrimental for ecological stability and persistence. Here we propose a modelling framework for population dynamics, which also include indirect cooperative...