Network connectivity during mergers and growth: optimizing the addition of a module

Details Network connectivity during mergers and growth: optimizing the addition of a module Network connectivity during mergers and growth: optimizing the addition of a module

2011-02-23

arxiv.org/abs/1102.4876v2

Physics

Physics and Society

7 pages, 5 figures

Scientific paper

The principal eigenvalue $\lambda$ of a network's adjacency matrix often determines dynamics on the network (e.g., in synchronization and spreading processes) and some of its structural properties (e.g., robustness against failure or attack) and is therefore a good indicator for how ``strongly'' a network is connected. We study how $\lambda$ is modified by the addition of a module, or community, which has broad applications, ranging from those involving a single modification (e.g., introduction of a drug into a biological process) to those involving repeated additions (e.g., power-grid and transit development). We describe how to optimally connect the module to the network to either maximize or minimize the shift in $\lambda$, noting several applications of directing dynamics on networks.

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