By Shigeyuki Kondō (auth.), Radu Laza, Matthias Schütt, Noriko Yui (eds.)

ISBN-10: 1461464021

ISBN-13: 9781461464020

ISBN-10: 146146403X

ISBN-13: 9781461464037

In fresh years, learn in K3 surfaces and Calabi–Yau forms has noticeable stunning growth from either mathematics and geometric issues of view, which in flip maintains to have an incredible impact and effect in theoretical physics—in specific, in string idea. The workshop on mathematics and Geometry of K3 surfaces and Calabi–Yau threefolds, held on the Fields Institute (August 16-25, 2011), aimed to offer a state of the art survey of those new advancements. This complaints quantity features a consultant sampling of the large diversity of subject matters coated via the workshop. whereas the topics variety from mathematics geometry via algebraic geometry and differential geometry to mathematical physics, the papers are certainly similar via the typical topic of Calabi–Yau forms. With the wide range of branches of arithmetic and mathematical physics touched upon, this region unearths many deep connections among matters formerly thought of unrelated.

Unlike such a lot different meetings, the 2011 Calabi–Yau workshop all started with three days of introductory lectures. a variety of four of those lectures is integrated during this quantity. those lectures can be utilized as a kick off point for the graduate scholars and different junior researchers, or as a advisor to the topic.

**Read Online or Download Arithmetic and Geometry of K3 Surfaces and Calabi–Yau Threefolds PDF**

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**Extra resources for Arithmetic and Geometry of K3 Surfaces and Calabi–Yau Threefolds**

**Example text**

Moreover, the natural map O(T ) → O(qT ) is surjective. The above theorem is due to Nikulin [30]. Nikulin proved a more general result. 2. 1 Periods of K3 Surfaces A K3 surface is a compact complex surface with H 1 (X, OX ) = 0 and KX = 0, where KX is the canonical line bundle of X. The important fact is that H 2 (X, Z) together with the cup product is an even unimodular lattice of signature (3, 19). This follows from Wu’s formula, Poincar´e duality, and Hirzebruch’s index theorem. For more details, we refer the reader to Barth et al.

16, 753–791 (2007) 16. E. Freitag, R. Salvati-Manni, The modular variety of hyperelliptic curves of genus three. Trans. Am. Math. Soc. 363, 281–312 (2011) 17. V. Gritsenko, K. Hulek, G. Sankaran, The Kodaira dimension of the moduli of K3 surfaces. Invent. Math. 169, 519–567 (2007) 18. E. Horikawa, On the periods of Enriques surfaces I, II. Math. Ann. 234, 78–108 (1978); Math. Ann. 235, 217–246 (1978) 19. H. Keum, Automorphisms of Jacobian Kummer surfaces. Comp. Math. 107, 269–288 (1997) 20. S. Kond¯o, Enriques surfaces with finite automorphism groups.

Consider a root sublattice R of L generated by some Leech roots. Denote by S the orthogonal complement of R in L. Then S is an even lattice of signature (1, 24 − rank(R)). Define D(S ) = C ∩ P(S )+, where P(S )+ = P(L)+ ∩ S ⊗ R. Let w be the projection of ρ into S ∗ . 7 Proposition ([4]) (1) w is contained in D(S ). In particular D(S ) is non-empty. (2) D(S ) is a finite polyhedron. Now assume that S is isomorphic to the Picard lattice S X of a K3 surface X. Since any (−2)-vector in S X is a (−2)-vector in L, we may assume that the ample cone C(X) of X contains D(S X ).

### Arithmetic and Geometry of K3 Surfaces and Calabi–Yau Threefolds by Shigeyuki Kondō (auth.), Radu Laza, Matthias Schütt, Noriko Yui (eds.)

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