Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2008-01-16
Nucl.Phys.B800:565-590,2008
Physics
High Energy Physics
High Energy Physics - Theory
25 pages
Scientific paper
10.1016/j.nuclphysb.2008.03.007
We study a proposal of D'Hoker and Phong for the chiral superstring measure for genus three. A minor modification of the constraints they impose on certain Siegel modular forms leads to a unique solution. We reduce the problem of finding these modular forms, which depend on an even spin structure, to finding a modular form of weight 8 on a certain subgroup of the modular group. An explicit formula for this form, as a polynomial in the even theta constants, is given. We checked that our result is consistent with the vanishing of the cosmological constant. We also verified a conjecture of D'Hoker and Phong on modular forms in genus 3 and 4 using results of Igusa.
Cacciatori Sergio L.
Geemen Bert van
Piazza Francesco Dalla
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