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Transient and slim versus recurrent and fat: Random walks and the trees they grow
Published online by Cambridge University Press: 01 October 2019
- Giulio Iacobelli*
- Affiliation:Federal University of Rio de Janeiro
- Daniel R. Figueiredo*
- Affiliation:Federal University of Rio de Janeiro
- Giovanni Neglia*
- Affiliation:Inria, Université Côte d’Azur
- *
- * Postal address: Instituto de Matemática, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil. Email addressgiulio@im.ufrj.br** Postal address: Department of Computer and System Engineering, COPPE, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil. Email addressdaniel@cos.ufrj.br*** Postal address: NEO Team, Inria, Sophia-Antipolis, France.Email addressgiovanni.neglia@inria.fr
Abstract
The no restart random walk (NRRW) is a random network growth model driven by a random walk that builds the graph while moving on it, adding and connecting a new leaf node to the current position of the walker everys steps. We show a fundamental dichotomy in NRRW with respect to the parity ofs: for${s}=1$ we prove that the random walk is transient and non-leaf nodes have degrees bounded above by an exponential distribution; fors even we prove that the random walk is recurrent and non-leaf nodes have degrees bounded below by a power law distribution. These theoretical findings highlight and confirm the diverse and rich behaviour of NRRW observed empirically.
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- © Applied Probability Trust 2019