Convergence of quenched Lyapunov exponents to the annealed exponent at high mobility

Let λpu0(κ)\lambda_p^{u_0}(\kappa) denote the quenched Lyapunov exponent of order pNp\in\mathbb{N} for mobility parameter κ\kappa, and let λ0u0(κ)\lambda_0^{u_0}(\kappa) be the corresponding exponent of order zero. In the population-dynamics interpretation, λ0u0(κ)\lambda_0^{u_0}(\kappa) describes the asymptotic fraction of time that the fastest-growing BB-particle lineages spend on AA-particles. High-mobility convergence conjecture. As the mobility parameter tends to infinity, the quenched Lyapunov exponents should merge with the corresponding annealed Lyapunov exponents, in the sense that

limκ[λpu0(κ)λ0u0(κ)]=0\lim_{\kappa\to\infty} [\lambda_p^{u_0}(\kappa)-\lambda_0^{u_0}(\kappa)]=0

for all pNp\in\mathbb{N}. This predicts that sufficiently rapid motion suppresses the distinction between the quenched exponents of positive order and the order-zero exponent; the source presents it as an expectation, and no resolution is supplied here.

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Primary source

Dirk Erhard, Frank den Hollander and Grégory Maillard, “The parabolic Anderson model in a dynamic random environment: basic properties of the quenched Lyapunov exponent”, arXiv:1208.0330 (2013).

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