Abstract
We show there is a symplectic conifold transition of a projective 3-fold which is not deformation equivalent to any Kahler manifold. The key ingredient is Mori’s classification of extremal rays on smooth projective 3-folds. It follows that there is a (nullhomologous) Lagrangian sphere in a projective variety which is not the vanishing cycle of any Kahler degeneration, answering a question of Donaldson.
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