Abstract
Following notation introduced in the recent paper (Rossi Int. J. Geom. Methods Mod. Phys. 12(5), 2015), this paper is aimed to present in detail an example of a small geometric transition which is not a simple one i.e. a deformation of a conifold transition. This is realized by means of a detailed analysis of the Kuranishi space of a Namikawa cuspidal fiber product, which in particular improves the conclusion of Y. Namikawa in Remark 2.8 and Example 1.11 of Namikawa (Topology 41(6), 1219–1237, 2002). The physical interest of this example is presenting a geometric transition which can’t be immediately explained as a massive black hole condensation to a massless one, as described by Strominger (Nucl. Phys. B451, 97–109, 1995).
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Acknowledgments
A first draft of the present paper was written on a visit to the Dipartimento di Matematica e Applicazioni of the Università di Milano Bicocca and the Department of Mathematics of the University of Pennsylvania. I would like to thank the Faculties of both Departments for warm hospitality and in particular F. Magri, R. Paoletti and S. Terracini from the first Department and R. Donagi, A. Grassi, T. Pantev and J. Shaneson from the second Department. Special thanks are due to A. Grassi for beautiful and stimulating conversations. I am also greatly indebted to B. van Geemen for useful suggestions.
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The author was partially supported by MIUR-PRIN 2010-11 Research Funds “Geometria delle Varietà Algebriche” and by the I.N.D.A.M. as a member of the G.N.S.A.G.A.
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Rossi, M. A Small and Non-simple Geometric Transition. Math Phys Anal Geom 20, 15 (2017). https://doi.org/10.1007/s11040-017-9247-z
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DOI: https://doi.org/10.1007/s11040-017-9247-z
Keywords
- Fiber products of rational elliptic surfaces
- Smoothing of singularities
- Resolution of singularities
- Calabi–Yau threefolds
- Calabi–Yau web
- Geometric transition
- Conifold transition
- Deformation of a Calabi–Yau threefold
- Deformation of a geometric transition