Let γ∈(0,2)\documentclass[12pt]{minimal}
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\begin{document}$$\gamma \in (0,2)$$\end{document} and let h be the random distribution on C\documentclass[12pt]{minimal}
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\begin{document}$$\mathbb C$$\end{document} which describes a γ\documentclass[12pt]{minimal}
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\begin{document}$$\gamma $$\end{document}-Liouville quantum gravity (LQG) cone. Also let κ=16/γ2>4\documentclass[12pt]{minimal}
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\begin{document}$$\kappa = 16/\gamma ^2 >4$$\end{document} and let η\documentclass[12pt]{minimal}
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\begin{document}$$\eta $$\end{document} be a whole-plane space-filling SLEκ\documentclass[12pt]{minimal}
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\begin{document}$$_\kappa $$\end{document} curve sampled independent from h and parametrized by γ\documentclass[12pt]{minimal}
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\begin{document}$$\gamma $$\end{document}-quantum mass with respect to h. We study a family {Gϵ}ϵ>0\documentclass[12pt]{minimal}
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\begin{document}$$\{\mathcal G^\epsilon \}_{\epsilon >0}$$\end{document} of planar maps associated with (h,η)\documentclass[12pt]{minimal}
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\begin{document}$$(h, \eta )$$\end{document} called the LQG structure graphs (a.k.a. mated-CRT maps) which we conjecture converge in probability in the scaling limit with respect to the Gromov–Hausdorff topology to a random metric space associated with γ\documentclass[12pt]{minimal}
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\begin{document}$$\gamma $$\end{document}-LQG. In particular, Gϵ\documentclass[12pt]{minimal}
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\begin{document}$$\mathcal G^\epsilon $$\end{document} is the graph whose vertex set is ϵZ\documentclass[12pt]{minimal}
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\begin{document}$$\epsilon \mathbb Z$$\end{document}, with two such vertices x1,x2∈ϵZ\documentclass[12pt]{minimal}
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\begin{document}$$x_1,x_2\in \epsilon \mathbb Z$$\end{document} connected by an edge if and only if the corresponding curve segments η([x1-ϵ,x1])\documentclass[12pt]{minimal}
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\begin{document}$$\eta ([x_1-\epsilon , x_1])$$\end{document} and η([x2-ϵ,x2])\documentclass[12pt]{minimal}
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\begin{document}$$\eta ([x_2-\epsilon ,x_2])$$\end{document} share a non-trivial boundary arc. Due to the peanosphere description of SLE-decorated LQG due to Duplantier et al. (Liouville quantum gravity as a mating of trees, 2014), the graph Gϵ\documentclass[12pt]{minimal}
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\begin{document}$$\mathcal G^\epsilon $$\end{document} can equivalently be expressed as an explicit functional of a correlated two-dimensional Brownian motion, so can be studied without any reference to SLE or LQG. We prove non-trivial upper and lower bounds for the cardinality of a graph-distance ball of radius n in Gϵ\documentclass[12pt]{minimal}
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\begin{document}$$\mathcal G^\epsilon $$\end{document} which are consistent with the prediction of Watabiki (Prog Theor Phys Suppl 114:1–17, 1993) for the Hausdorff dimension of LQG. Using subadditivity arguments, we also prove that there is an exponent χ>0\documentclass[12pt]{minimal}
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\begin{document}$$\chi > 0$$\end{document} for which the expected graph distance between generic points in the subgraph of Gϵ\documentclass[12pt]{minimal}
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\begin{document}$$\mathcal G^\epsilon $$\end{document} corresponding to the segment η([0,1])\documentclass[12pt]{minimal}
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\begin{document}$$\eta ([0,1])$$\end{document} is of order ϵ-χ+oϵ(1)\documentclass[12pt]{minimal}
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\begin{document}$$\epsilon ^{-\chi + o_\epsilon (1)}$$\end{document}, and this distance is extremely unlikely to be larger than ϵ-χ+oϵ(1)\documentclass[12pt]{minimal}
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\begin{document}$$\epsilon ^{-\chi + o_\epsilon (1)}$$\end{document}.
