Mathematics – Probability
Scientific paper
2011-07-06
Mathematics
Probability
Scientific paper
Consider the branching simple random walk on Z^d indexed by a critical
geometric Galton-Watson tree conditioned to survive. Using the concept of
unimodular random graphs, we show that the walk is recurrent if and only if d
is less than or equal to 4.
Benjamini Itai
Curien Nicolas
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