Trimmed-range large deviations for simple random walk

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For n∈Nn\in\mathbb N and A∈NA\in\mathbb N, define the set of sites visited between one and AA times and its associated local time by

Rn,A−={x∈Zd:1≤ℓn(x)≤A},γn,A−=∑x∈Rn,A−ℓn(x).R_{n,A}^- = \{x\in\mathbb Z^d:1\leq\ell_n(x)\leq A\},\qquad \gamma_{n,A}^- = \sum_{x\in R_{n,A}^-}\ell_n(x).

Let λd(A)\lambda_d(A) and J(A,s)J(A,s) denote the quantities in the conjecture. Trimmed-range conjecture. For every A∈NA\in\mathbb N and s∈[0,1]s\in[0,1] there exists J(A,s)J(A,s) such that, for θ>0\theta>0 and n≥n0(A,s,θ)n\geq n_0(A,s,\theta),

P(∣Rn,A−∣≥sθn, γn,A≤θn)≤e−J(A,s)θn,P\bigl(|R_{n,A}^-|\geq s\theta n,\ \gamma_{n,A}\leq\theta n\bigr)\leq e^{-J(A,s)\theta n},

with

d=2:J(A,s)>0 for s>0,d=2:\quad J(A,s)>0\text{ for }s>0,

and, for d≥3d\geq 3,

J(A,s)=0 for 0≤s≤1/λd(A),J(A,s)>0 for 1/λd(A)<s≤1.J(A,s)=0\text{ for }0\leq s\leq1/\lambda_d(A),\qquad J(A,s)>0\text{ for }1/\lambda_d(A)<s\leq1.

Moreover,

d=2:lim⁡s↓0−slog⁡J(A(s),s)=1λ2,A(s)≫s−10,d=2:\quad\lim_{s\downarrow0}-s\log J(A(s),s)=\frac1{\lambda_2},\quad A(s)\gg s^{-10},

and, for d≥3d\geq3, λd(A)<λd\lambda_d(A)<\lambda_d with lim⁡A→∞λd(A)=λd\lim_{A\to\infty}\lambda_d(A)=\lambda_d. This conjecture concerns upward large deviations of the range after trimming sites with excessive local time. The paper states that it would supply the technical estimate needed for the sharp small-bias critical-curve asymptotics; it remains open.

References

Primary source

Quentin Berger, Frank den Hollander and Julien Poisat, “Annealed scaling for a charged polymer in dimensions two and higher”, arXiv:1708.06707 (2017).

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