Threshhold Corrections in $K3\times T2$ Heterotic String Compactifications

Details Threshhold Corrections in $K3\times T2$ Heterotic String Compactifications Threshhold Corrections in $K3\times T2$ Heterotic String Compactifications

1996-08-21

arxiv.org/abs/hep-th/9608145v1

Nucl.Phys. B482 (1996) 187-212

Physics

High Energy Physics

High Energy Physics - Theory

26pp. harvmac b mode

Scientific paper

10.1016/S0550-3213(96)00549-4

We consider compactifications of the heterotic string on $K3 \times T2$ so that the resulting theory in $d = 4$ space-time dimensions has $N = 2$ supersymmetry. The gravitational and gauge coupling constants of the low-energy effective theory receive threshold corrections from loops of super-heavy string states. We calculate these corrections for the case when the $K3$-surface is a ${\bf Z}_n$ orbifold of a four torus $T4$. The results are used to determine the one-loop prepotential ${\cal F}_0^{(1)}$ for the vector multiplets and the gravitational coupling ${\cal F}_1^{(1)}$.

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