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Dyon Spectrum in N=4 Supersymmetric Type II String Theories

Justin R. David·Dileep P. Jatkar·Ashoke Sen
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Abstract

We compute the spectrum of quarter BPS dyons in freely acting Z_2 and Z_3 orbifolds of type II string theory compactified on a six dimensional torus. For large charges the result for statistical entropy computed from the degeneracy formula agrees with the corresponding black hole entropy to first non-leading order after taking into account corrections due to the curvature squared terms in the effective action. The result is significant since in these theories the entropy of a small black hole, computed using the curvature squared corrections to the effective action, fails to reproduce the statistical entropy associated with elementary string states.

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Justin R. David, Dileep P. Jatkar, Ashoke Sen. 2006-09-13. Dyon Spectrum in N=4 Supersymmetric Type II String Theories. https://doi.org/10.1088/1126-6708%2F2006%2F11%2F073

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