The physicists (see e.g. this paper of Aganagic and Vafa) will write the mirror as a threefold which is an affine conic bundle over the holomorphic symplectic surface with discriminant a Seiberg-Witten curve . In terms of the affine coordinates on , the curve is given by the equation
and so is the hypersurface in given by the equation
From geometric point of view it may be more natural to think of the mirror not as an affine conic fibration over a surface but as an affine fibration by two dimensional quadrics over a curve. The idea will be to start with the Landau-Ginzburg mirror of , which is equipped with the superpotential and to consider a bundle of affine two dimensional quadrics on which degenerates along a smooth fiber of the superpotential, e.g. the fiber . In this setting the mirror will be a hypersurface in given by the equation
Up to change of variables this is equivalent to the previous picture but it also makes sense in non-toric situations. Presumably one can obtain this way the mirror of a Calabi-Yau which is the total space of a rank two (semistable) vector bundle of canonical determinant on a curve of higher genus.
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