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

ISBN-10: 1461464021

ISBN-13: 9781461464020

ISBN-10: 146146403X

ISBN-13: 9781461464037

In contemporary years, examine in K3 surfaces and Calabi–Yau types has obvious unbelievable growth from either mathematics and geometric issues of view, which in flip keeps to have an incredible impact and effect in theoretical physics—in specific, in string concept. 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 cutting-edge survey of those new advancements. This court cases quantity incorporates a consultant sampling of the extensive variety of issues lined through the workshop. whereas the topics variety from mathematics geometry via algebraic geometry and differential geometry to mathematical physics, the papers are obviously similar through the typical subject matter of Calabi–Yau types. With the wide variety of branches of arithmetic and mathematical physics touched upon, this quarter unearths many deep connections among topics formerly thought of unrelated.

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

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**Additional info for Arithmetic and Geometry of K3 Surfaces and Calabi–Yau Threefolds**

**Example text**

X are primitive sublattices of H (X, Z). Moreover LX By the definition of Enriques surfaces we can see that the second Betti number of Enriques surfaces is 10. 5. Since π is an unramified double covering, LX U(2) ⊕ E8 (2). 11, qL+X = −qL−X . 16). It is known that L− X U ⊕ U(2) ⊕ E8 (2). We fix abstract lattices L+ = U(2) ⊕ E8 (2) and L− = U ⊕ U(2) ⊕ E8 (2). 8 that there exists an even unimodular lattice L of signature (3, 19) which is an overlattice of L+ ⊕ L− . Let ι be an isometry (1L+ , −1L− ) of L+ ⊕ L− .

Geom. 11, 601–627 (2002) 26. S. Kond¯o, The moduli space of 8 points on P1 and automorphic forms. Contemp. Math. 422, 89–106 (2007) 27. S. Kond¯o, Moduli of plane quartics, G¨opel invariants and Borcherds products. Int. Math. Res. Notices 2011, 2825–2860 (2011) 28. S. Mukai, Finite groups of automorphisms of K3 surfaces and the Mathieu group. Invent. Math. 94, 183–221 (1988) 28 S. Kond¯o 29. V. Nikulin, Finite groups of automorphisms of K¨ahlerian surfaces of type K3. Moscow Math. Soc. 38, 71–137 (1980) 30.

A simple proof of this fact can be found in Sect. 7 of [36]. Note that the morphism HYi (X, Q) → H i (X, Q) is a morphism of MHS, and that accordingly HYi (X, Q) H i−2r (Y, Q(−r)) is an isomorphism of MHS (with Y still smooth). Strict compatibility means that h(F r V1,C ) = h(V1,C ) ∩ F r V2,C and h(W V1,A⊗Q ) = h(V1,A⊗Q ) ∩ W V2,A⊗Q for all r and . A nice explanation of Deligne’s proof of this fact can be found in [44], where a quick summary goes as follows: For any A-MHS V, VC has a C-splitting into a bigraded direct sum of complex vector spaces I p,q := F p ∩W p+q ∩ F q ∩W p+q + i≥2 F q−i+1 ∩W p+q−i , where one shows that F r VC = ⊕ p≥r ⊕q I p,q and W VC = ⊕ p+q≤ I p,q .

### 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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