The general-\p formula for annealed Lyapunov exponents

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Let ξ\xi be the random potential satisfying the essential-supremum and bounded independent-identically-distributed assumptions, let κ>0\kappa>0 be the diffusion parameter, and let λp\lambda_p denote the pp-th annealed Lyapunov exponent. For h=1h=1 and p∈(0,∞)p\in(0,\infty), the general-\p Lyapunov-exponent conjecture. λp\lambda_p is the zero of

β↦log⁡⟨(κκ+β−ξ(0))p⟩\beta\mapsto\log\Big\langle\Big(\frac{\kappa}{\kappa+\beta-\xi(0)}\Big)^p\Big\rangle

in (−κ,0)(-\kappa,0) if this zero exists, and is −κ-\kappa otherwise. The preceding argument proves the formula only for natural pp; extending it to all positive pp is expected but not established in the source.

References

Primary source

Alexander Drewitz, “Lyapunov exponents for the one-dimensional parabolic Anderson model with drift”, arXiv:0803.1480 (2008).

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