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Documents  Pioline, Boris | enregistrements trouvés : 2

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- xvi; 294 p.
ISBN 978-1-4704-3515-8

Proceedings of symposia in pure mathematics , 0098

Localisation : Collection 1er étage

géométrie algébrique # théorie quantique # programme de Langlands # espace fibré vectoriel # fibration # espace modulaire # symétrie miroir # analyse globale # application harmonique # théorie des champs # théorie des cordes

14D24 ; 14H60 ; 14D21 ; 14J33 ; 58E20 ; 81T60 ; 81T30 ; 14-04 ; 81T13 ; 00B25

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Research talks;Dynamical Systems and Ordinary Differential Equations;Mathematical Physics

The genus-two Kawazumi-Zhang (KZ) invariant is a real-analytic modular function on the Siegel upper half-plane of degree two, which plays an important role in arithmetic geometry. In String theory, it appears as part of the integrand in two-loop four-graviton scattering amplitudes. With hindsight from String theory, I will show that the KZ invariant can be obtained as a generalized Borcherds lift from a weak Jacobi form of index 1 and weight 2. This implies that the KZ invariant is an eigenmode of the quadratic and quartic Casimir operators, and gives access to the full asymptotic expansion in all possible degeneration limits. It also reveals a mock-type holomorphic Siegel modular form underlying the KZ invariant. String theory amplitudes involves modular integrals of the KZ invariant (times lattice partition functions) on the Siegel upper half-plane, which provide new examples of automorphic objects on orthogonal Grassmannians, beyond the usual Langlands-Eisenstein series.

Note: this talk is based on the preprint "A Theta lift representation for the Kawazumi-Zhang and Faltings invariants of genus-two Riemann surfaces" available on arXiv:1504.04182. Following up on a question asked during the talk (which was answered very poorly), the author obtained shortly after a proof of the conjecture stated in this preprint and during the talk. The proof is available in the revised version arXiv:1504.04182v2.
The genus-two Kawazumi-Zhang (KZ) invariant is a real-analytic modular function on the Siegel upper half-plane of degree two, which plays an important role in arithmetic geometry. In String theory, it appears as part of the integrand in two-loop four-graviton scattering amplitudes. With hindsight from String theory, I will show that the KZ invariant can be obtained as a generalized Borcherds lift from a weak Jacobi form of index 1 and weight 2. ...

81T30 ; 83E30

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