Conjectured two-point correlations for the type B MultiTASEP

From papers

Let nn be the rank parameter of the type BB MultiTASEP, and write a,b\langle a,b\rangle for the two-point correlation of entries in the last two positions, with barred symbols denoting signed entries. The preceding text gives the identity i,j=i,j\langle i,\overline{j}\rangle=\langle i,j\rangle. Conjectured two-point correlations. For the last two positions in the type BB MultiTASEP, the following identities hold:

i,j=1(2n)2(3in, 1ji2),\langle \overline{i},\overline{j}\rangle=\frac{1}{(2n)^2}\quad (3\leq i\leq n,\ 1\leq j\leq i-2), j+1,j=1(2n)2+n2j24n2(2n1)(1jn1),\langle \overline{j+1},\overline{j}\rangle=\frac{1}{(2n)^2}+\frac{n^2-j^2}{4n^2(2n-1)}\quad (1\leq j\leq n-1), i,j=ji2n2(2n1)(1in1, i+1jn),\langle \overline{i},\overline{j}\rangle=\frac{j-i}{2n^2(2n-1)}\quad (1\leq i\leq n-1,\ i+1\leq j\leq n), i,j=i+j12n2(2n1)(1in2, i+2jn),\langle i,\overline{j}\rangle=\frac{i+j-1}{2n^2(2n-1)}\quad (1\leq i\leq n-2,\ i+2\leq j\leq n), j,j+1=j(n2j2+2n2)2n2(2n1)(n1)(1jn1),\langle j,\overline{j+1}\rangle=\frac{j(n^2-j^2+2n-2)}{2n^2(2n-1)(n-1)}\quad (1\leq j\leq n-1), i,j=3(ij)(i+j1)4n2(2n1)(n1)(2in, 1ji1).\langle i,\overline{j}\rangle=\frac{3(i-j)(i+j-1)}{4n^2(2n-1)(n-1)}\quad (2\leq i\leq n,\ 1\leq j\leq i-1).

These formulas would determine all two-point correlations using the stated symmetry identity. The paper explains that its techniques do not determine all correlations, so these formulas are proposed as conjectural extensions of the proved results.

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Sources & referencesView supporting material

Primary source

Erik Aas, Arvind Ayyer, Svante Linusson and Samu Potka, “Limiting directions for random walks in classical affine Weyl groups”, arXiv:2004.13399 (2021).

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