The aim of this paper is to classify mildly singular Calabi-Yau threefolds fibred in low-degree weighted K3 surfaces and embedded as anticanonical hypersurfaces in weighted scrolls, extending results of Mullet. We also study projective degenerations, revisiting an example due to Gross and Ruan. Finally we briefly discuss the general question of embedding a projective fibration into a weighted scroll.
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Univ Tokyo, Grad Sch Math Sci, Maguro Ku, 3-8-1 Komaba, Tokyo 1538914, JapanUniv Tokyo, Grad Sch Math Sci, Maguro Ku, 3-8-1 Komaba, Tokyo 1538914, Japan
Hashimoto, Kenji
Kanazawa, Atsushi
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Harvard Univ, Dept Math, One Oxford St, Cambridge, MA 02138 USAUniv Tokyo, Grad Sch Math Sci, Maguro Ku, 3-8-1 Komaba, Tokyo 1538914, Japan
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Univ Versailles St Quentin En Yvelines, Lab Math Versailles, 45 Ave Etats Unis, F-78035 Versailles, FranceUniv Versailles St Quentin En Yvelines, Lab Math Versailles, 45 Ave Etats Unis, F-78035 Versailles, France
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Univ Penn, Dept Math, David Rittenhouse Lab, 209 South 33rd St, Philadelphia, PA 19104 USAUniv Penn, Dept Math, David Rittenhouse Lab, 209 South 33rd St, Philadelphia, PA 19104 USA
Donagi, Ron
Macerato, Mark
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Univ Calif Berkeley, Dept Math, Evans Hall, Berkeley, CA 94720 USAUniv Penn, Dept Math, David Rittenhouse Lab, 209 South 33rd St, Philadelphia, PA 19104 USA
Macerato, Mark
Sharpe, Eric
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Virginia Tech, Dept Phys MC 0435, 850 Campus Dr, Blacksburg, VA 24061 USAUniv Penn, Dept Math, David Rittenhouse Lab, 209 South 33rd St, Philadelphia, PA 19104 USA