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- W2890323870 abstract "Balls and bins models are classical probabilistic models where balls are added to bins at random according to a certain rule. The balls and bins model with feedback is a non-linear generalisation of the P'olya urn, where the probability of a new ball choosing a bin with $m$ balls is proportional to $m^{alpha}$, with $alpha$ being the feedback parameter. It is known that if the feedback is positive (i.e. $alpha>1$) then the model is monopolistic: there is a finite time after which one of the bins will receive all incoming balls. We consider a time-dependent version of this model, where $sigma_n$ independent balls are added at time $n$ instead of just one. We show that if $alpha>1$ then one of the bins gets all but a negligible number of balls, and identify a phase transition in the growth of $(sigma_n)$ between the monopolistic and non-monopolistic behaviour. We also describe the critical regime, where the probability of monopoly is strictly between zero and one. Finally, we show that in the feedback-less case $alpha=1$ no dominance occurs, that is, each bin gets a non-negligible proportion of balls eventually. This is in sharp contrast with a similar model where new balls added at time $n$ are all placed in the same bin rather than independently." @default.
- W2890323870 created "2018-09-27" @default.
- W2890323870 creator A5047993318 @default.
- W2890323870 date "2018-09-06" @default.
- W2890323870 modified "2023-09-27" @default.
- W2890323870 title "Time-dependent balls and bins model with positive feedback" @default.
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