Dyon Spectrum in N=4 Supersymmetric Type II String Theories
Justin R. David, Dileep P. Jatkar, Ashoke Sen
Abstract
We compute the spectrum of quarter BPS dyons in freely acting Z2 and Z3 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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