The biased-separable representation conjecture for skew Brownian permutons

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For ρ∈[−1,1]\rho\in[-1,1] and q∈[0,1]q\in[0,1], the skew Brownian permuton μρ,q\bm\mu_{\rho,q} is the push-forward of Lebesgue measure on [0,1][0,1] by the map (Id⁡,φZρ,q)(\operatorname{Id},\varphi_{\bm{\mathscr Z}_{\rho,q}}). For p∈[0,1]p\in[0,1], let μ(p)\bm\mu^{(p)} be the biased Brownian separable permuton.

Biased-separable representation conjecture. For every p∈[0,1]p\in[0,1],

μ(p)=dμ1,1−p.\bm\mu^{(p)}\stackrel{d}{=}\bm\mu_{1,1-p}.

The Baxter permuton is already identified with the case (ρ,q)=(−1/2,1/2)(\rho,q)=(-1/2,1/2). This conjecture identifies the opposite extremal family with the biased Brownian separable permutons and provides evidence for the broader skew Brownian universality picture.

References

Primary source

Jacopo Borga, “Random Permutations – A geometric point of view”, arXiv:2107.09699 (2021).

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