Quartic Gauge Couplings from K3 Geometry

Details Quartic Gauge Couplings from K3 Geometry Quartic Gauge Couplings from K3 Geometry

1998-11-26

arxiv.org/abs/hep-th/9811228v3

Adv.Theor.Math.Phys.3:1575-1611,1999

Physics

High Energy Physics

High Energy Physics - Theory

32 p, harvmac; One footnote on page 11 extended; results unchanged; Version subm. to ATMP

Scientific paper

We show how certain F^4 couplings in eight dimensions can be computed using the mirror map and K3 data. They perfectly match with the corresponding heterotic one-loop couplings, and therefore this amounts to a successful test of the conjectured duality between the heterotic string on T^2 and F-theory on K3. The underlying quantum geometry appears to be a 5-fold, consisting of a hyperk"ahler 4-fold fibered over a IP^1 base. The natural candidate for this fiber is the symmetric product Sym^2(K3). We are lead to this structure by analyzing the implications of higher powers of E_2 in the relevant Borcherds counting functions, and in particular the appropriate generalizations of the Picard-Fuchs equations for the K3.

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