Universality conjecture for the dimension of three-stars in Liouville quantum gravity

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Fix a whole-plane Gaussian free field hh and let DhD_h be the associated γ\gamma-Liouville quantum gravity metric for γ∈(0,2)\gamma\in(0,2). Let S3⊆C\mathfrak{S}_3\subseteq\mathbb{C} denote the set of points from which three geodesics emanate pairwise disjointly except at their common starting point. Universality conjecture for three-stars. Almost surely,

dim⁡Dh(S3)=2.\dim_{D_h}(\mathfrak{S}_3)=2.

The precise Hausdorff dimensions of kk-stars are known in some other random geometric models, including Brownian geometry and the directed landscape, but remain largely unknown for general γ\gamma-LQG. This conjecture predicts that the dimension of the set of three-stars is universal across the LQG parameter range.

References

Primary source

Manan Bhatia and Konstantinos Kavvadias, “Strong confluence of geodesics in Liouville quantum gravity”, arXiv:2512.09219 (2025).

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