Mirror partner for a Klein quartic polynomial

Abstract

The results of A.Chiodo, Y.Ruan and M.Krawitz associate the mirror partner Calabi-Yau variety $X$ to a Landau--Ginzburg orbifold $(f,G)$ if $f$ is an invertible polynomial satisfying Calabi-Yau condition and the group $G$ is a diagonal symmetry group of $f$. In this paper we investigate the Landau-Ginzburg orbifolds with a Klein quartic polynomial $f=x_1^3{x}_2+x_2^3{x}_3+x_3^3{x}_1$ and $G$ being all possible subgroups of $\mathrm{GL}(3,\mathbb{C})$, preserving the polynomial $f$ and also the pairing in its Jacobian algebra. In particular, $G$ is not necessarily abelian or diagonal. The zero-set of polynomial $f$, called Klein quartic, is a genus $3$ smooth compact Riemann surface. We show that its mirror Landau-Ginzburg orbifold is $(f,G)$ with $G$ being a $\mathbb{Z}/2\mathbb{Z}$-extension of a Klein four-group.

journal version

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