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Article Dans Une Revue Advances in Applied Probability Année : 2015

Exponential growth of bifurcating processes with ancestral dependence

Sana Louhichi
Bernard Ycart
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Résumé

Branching processes are classical growth models in cell kinetics. In their construction, it is usually assumed that cell lifetimes are independent random variables, which has been proved false in experiments. Models of dependent lifetimes are considered here, in particular bifurcating Markov chains. Under hypotheses of stationarity and multiplicative ergodicity, the corresponding branching process is proved to have the same type of asymptotics as its classic counterpart in the i.i.d. supercritical case: the cell population grows exponentially, the growth rate being related to the exponent of multiplicative ergodicity, in a similar way as to the Laplace transform of lifetimes in the i.i.d. case. An identifiable model for which the multiplicative ergodicity coefficients and the growth rate can be explicitly computed is proposed.

Dates et versions

hal-00851631 , version 1 (15-08-2013)

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Sana Louhichi, Bernard Ycart. Exponential growth of bifurcating processes with ancestral dependence. Advances in Applied Probability, 2015, 47 (2), pp.545-564. ⟨10.1239/aap/1435236987⟩. ⟨hal-00851631⟩
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