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

par Bonelli, Giulio
Référence The journal of high energy physics (Online), 5, 12, page (XXXII-12)
Publication Publié, 2001

Article révisé par les pairs

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Résumé :

We study the BPS spectrum of Little String Theory for bound states of M5-branes wrapped on six manifold of product topology M4 × ∑2 and the apparence of multiloop 0-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 Bk and, by studying the relevant amplitude, we notice the arising of 0-functions relative to BPS strings on Tk-1, i.e. membranes on Tk. 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 [1].