Abstract
We introduce a mean-field model of lattice trees based on embeddings into ℤd of abstract trees having a critical Poisson offspring distribution. This model provides a combinatorial interpretation for the self-consistent mean-field model introduced previously by Derbez and Slade [9], and provides an alternative approach to work of Aldous. The scaling limit of the meanfield model is integrated super-Brownian excursion (ISE), in all dimensions. We also introduce a model of weakly self-avoiding lattice trees, in which an embedded tree receives a penaltye −β for each self-intersection. The weakly self-avoiding lattice trees provide a natural interpolation between the mean-field model (β=0), and the usual model of strictly self-avoiding lattice tress (β=∞) which associates the uniform measure to the set of lattice trees of the same size.
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Borgs, C., Chayes, J., van der Hofstad, R. et al. Mean-field lattice trees. Annals of Combinatorics 3, 205–221 (1999). https://doi.org/10.1007/BF01608784
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DOI: https://doi.org/10.1007/BF01608784