The M5-brane on K3 and del Pezzo's and multi-loop string amplitudes

Details The M5-brane on K3 and del Pezzo's and multi-loop string amplitudes The M5-brane on K3 and del Pezzo's and multi-loop string amplitudes

2001-11-14

arxiv.org/abs/hep-th/0111126v2

JHEP 0112:022,2001

Physics

High Energy Physics

High Energy Physics - Theory

1+14 pages; v2: misprints corrected, clarifications and one reference added

Scientific paper

10.1088/1126-6708/2001/12/022

We study the BPS spectrum of Little String Theory for bound states of M5-branes wrapped on six manifold of product topology $M_4\times\Sigma_2$ and the apparence of multi-loop $\theta$-functions in a supersymmetric index calculation. We find a total reconstruction of the g-loop heterotic contribution in the case of a double K3 M-theory compactification. Moreover, we consider total wrapping of M5-branes on del Pezzo surfaces $B_k$ and, by studying the relevant amplitude, we notice the arising of $\theta$-functions relative to BPS strings on $T^{k-1}$, i.e. membranes on $T^k$. This happens because of beautiful relations between four dimensional SYM theories and CFTs in two dimensions and seems to be linked to a duality recently observed by A.Iqbal, A.Neitzke and C.Vafa in.

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