Arithmetic structure of Mumford's fake projective plane

Details Arithmetic structure of Mumford's fake projective plane Arithmetic structure of Mumford's fake projective plane

1999-07-19

arxiv.org/abs/math/9907116v1

Mathematics

Algebraic Geometry

11 pages

Scientific paper

This is a revised version of a part of the author's preprint "On p-adic uniformization of fake projective planes" (preprint, Max-Planck-Institut fuer Mathematik, 1998 (121)). In this paper we construct explicitly a Shimura surface of PEL-type, associated to a certain unitary group, whose connected components are isomorphic to Mumford's fake projective plane. We also give the canonical model, Shimura field and number of connected components of this Shimura surface. As a consequence of the construction we prove that the Mumford's fake projective plane is an arithmetic complex unit-ball quotient, and has the 7-th cyclotomic field as a field of definition. In Tohoku Math. J. 50 (1998), 537-555, Masanori Ishida and the author discussed two other possible fake projective planes. The author has also obtained the corresponding results as above for these fake projective planes and has written them in the above preprint, which is available in the web page: http://www.mpim-bonn.mpg.de/html/preprints/preprints.html

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