dSKP diagonal singularity conjecture

Let L\mathcal{L} be the lattice on which the dSKP recurrence is defined, let x:LC^x:\mathcal{L}\to\hat{\mathbb{C}} be a solution, and set ai,j=x(i,j,[i+j]2)a_{i,j}=x(i,j,[i+j]_2). Suppose m2N+2m\in 2\mathbb{N}+2 and p2N+2p\in 2\mathbb{N}+2, that

ai,j=ai+m,j+m=ai+p1,j+p+1a_{i,j}=a_{i+m,j+m}=a_{i+p-1,j+p+1}

for all (i,j)Z2(i,j)\in\mathbb{Z}^2, and that

ai,j=ai+1,j+1a_{i,j}=a_{i+1,j+1}

for all (i,j)Z2(i,j)\in\mathbb{Z}^2 with [i+j]4=0[i+j]_4=0. dSKP diagonal singularity conjecture. Either

x(i,j,m)=x(i+1,j+1,m)x(i,j,m)=x(i+1,j+1,m)

for every (i,j)Z2(i,j)\in\mathbb{Z}^2 with [i+j]4=[m]4[i+j]_4=[m]_4, or the same equality holds for every (i,j)Z2(i,j)\in\mathbb{Z}^2 with [i+j]4=[m+2]4[i+j]_4=[m+2]_4. This conjecture describes a singularity for dSKP initial data with the specified periodicities, distinct from the previously discussed pentagram-map singularity. The source gives no resolution status.

Sources & referencesView supporting material

Primary source

Niklas Christoph Affolter, Béatrice de Tilière and Paul Melotti, “The Schwarzian octahedron recurrence (dSKP equation) II: geometric systems”, arXiv:2208.00244 (2024).

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