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1.	Gaberdiel, Matthias R., et al. (författare) Borcherds algebras and N=4 topological amplitudes 2011 Ingår i: Journal of High Energy Physics. - 1029-8479 .- 1126-6708. ; 2011:6, s. 125- Tidskriftsartikel (refereegranskat)abstract The perturbative spectrum of BPS-states in the E(8)xE(8) heterotic string theory compactified on T(2) is analysed. We show that the space of BPS-states forms a representation of a certain Borcherds algebra G which we construct explicitly using an auxiliary conformal field theory. The denominator formula of an extension G(ext) superset of G of this algebra is then found to appear in a certain heterotic one-loop N = 4 topological string amplitude. Our construction thus gives an N = 4 realisation of the idea envisioned by Harvey and Moore, namely that the 'algebra of BPS-states' controls the threshold corrections in the heterotic string.

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