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In [[algebraic geometry]], the '''Horrocks–Mumford bundle''' is an indecomposable rank 2 [[vector bundle]] on 4-dimensional [[projective space]] ''P''<sup>4</sup> introduced by {{harvs|txt|author1-link= Geoffrey Horrocks |author2-link=David Mumford|first=Geoffrey|last= Horrocks |first2=David|last2= Mumford|year=1973}}. It is the only such bundle known, although a generalized construction involving [[Paley graph]]s produces other rank 2 [[Sheaf (mathematics)|sheaves]] (Sasukara et al. 1993). The zero sets of sections of the Horrocks–Mumford bundle are [[abelian surface]]s of degree 10, called '''Horrocks–Mumford surfaces'''. | |||
By computing [[Chern classes]] one sees that the second [[exterior power]] <math> \wedge^2 F </math> of the Horrocks–Mumford bundle ''F'' is the line bundle ''O(5)'' on ''P<sup>4</sup>''. Therefore the zero set ''V'' of a general section of this bundle is a [[quintic threefold]] called a '''Horrocks–Mumford quintic'''. Such a ''V'' has exactly 100 nodes; there exists a small resolution ''V′'' which is a [[Calabi–Yau]] threefold fibered by Horrocks–Mumford surfaces. | |||
==See also== | |||
*[[List of algebraic surfaces]] | |||
==References== | |||
*{{citation | |||
| author1-link=Geoffrey Horrocks | |||
|last1=Horrocks|last2= G. | |||
|author2-link=David Mumford|last2=Mumford|first2= D. | |||
| title = A rank 2 vector bundle on ''P''<sup>4</sup> with 15000 symmetries | |||
| journal = Topology | |||
| volume = 12 | |||
| pages = 63–81 | |||
| year = 1973 | |||
| doi = 10.1016/0040-9383(73)90022-0 | |||
|id={{MR|0382279}} | |||
}} | |||
*{{Citation | last1=Hulek | first1=Klaus | title=Vector bundles in algebraic geometry (Durham, 1993) | publisher=[[Cambridge University Press]] | series=London Math. Soc. Lecture Note Ser. | doi=10.1017/CBO9780511569319.007 | id={{MathSciNet | id = 1338416}} | year=1995 | volume=208 | chapter=The Horrocks–Mumford bundle | pages=139–177}} | |||
*{{cite journal | |||
| author = Sasakura, Nobuo; Enta, Yoichi; Kagesawa, Masataka | |||
| title = Construction of rank two reflexive sheaves with similar properties to the Horrocks–Mumford bundle | |||
| journal = Proc. Japan Acad., Ser. A | |||
| volume = 69 | |||
| issue = 5 | |||
| pages = 144–148 | |||
| year = 1993 | |||
| doi = 10.3792/pjaa.69.144}} | |||
{{DEFAULTSORT:Horrocks-Mumford bundle}} | |||
[[Category:Algebraic varieties]] | |||
[[Category:Vector bundles]] | |||
{{geometry-stub}} |
Revision as of 15:34, 10 January 2014
In algebraic geometry, the Horrocks–Mumford bundle is an indecomposable rank 2 vector bundle on 4-dimensional projective space P4 introduced by Template:Harvs. It is the only such bundle known, although a generalized construction involving Paley graphs produces other rank 2 sheaves (Sasukara et al. 1993). The zero sets of sections of the Horrocks–Mumford bundle are abelian surfaces of degree 10, called Horrocks–Mumford surfaces.
By computing Chern classes one sees that the second exterior power of the Horrocks–Mumford bundle F is the line bundle O(5) on P4. Therefore the zero set V of a general section of this bundle is a quintic threefold called a Horrocks–Mumford quintic. Such a V has exactly 100 nodes; there exists a small resolution V′ which is a Calabi–Yau threefold fibered by Horrocks–Mumford surfaces.
See also
References
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