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- W3207081372 abstract "Kato and Usui developed a theory of partial compactifications for quotients of period domains D by arithmetic groups Γ, in an attempt to generalize the toroidal compactifications of Ash-Mumford-Rapoport-Tai to non-classical cases. Their partial compactifications, which aim to fully compactify the images of period maps, rely on the choice of a fan which is strongly compatible with Γ. In particular, they conjectured the existence of a complete fan, which would serve to simultaneously compactify all period maps of a given type. In this article, we briefly review the theory, and construct a fan which compactifies the image of a period map arising from a particular two-parameter family of Calabi-Yau threefolds studied by Hosono and Takagi, with Hodge numbers (1,2,2,1). On the other hand, we disprove the existence of complete fans in some general cases, including the (1,2,2,1) case." @default.
- W3207081372 created "2021-10-25" @default.
- W3207081372 creator A5018141568 @default.
- W3207081372 date "2022-09-01" @default.
- W3207081372 modified "2023-09-27" @default.
- W3207081372 title "Extension of period maps by polyhedral fans" @default.
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- W3207081372 doi "https://doi.org/10.1016/j.aim.2022.108532" @default.
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