K3 surfaces from configurations of six lines in ℙ2 and mirror symmetry II—λ<i>K</i>3-functions

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  • Shinobu Hosono
    Department of Mathematics, Gakushuin University Mejiro, Toshima-ku, Tokyo 171-8588, Japan
  • Bong H Lian
    Department of Mathematics, Brandeis University, Waltham, MA 02454, USA
  • Shing-Tung Yau
    Department of Mathematics, Harvard University, Cambridge, MA 02138, USA

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<jats:title>Abstract</jats:title><jats:p>We continue our study on the hypergeometric system $E(3,6)$ that describes period integrals of the double cover family of K3 surfaces. Near certain special boundary points in the moduli space of the K3 surfaces, we construct the local solutions and determine the so-called mirror maps expressing them in terms of genus 2 theta functions. These mirror maps are the K3 analogues of the elliptic $\lambda $-function. We find that there are two nonisomorphic definitions of the lambda functions corresponding to a flip in the moduli space. We also discuss mirror symmetry for the double cover K3 surfaces and their higher dimensional generalizations. A follow-up paper will describe more details of the latter.</jats:p>

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