Dyon Spectrum in CHL Models

@inproceedings{Jatkar2005DyonSI,
  title={Dyon Spectrum in CHL Models},
  author={Dileep P. Jatkar and Ashoke Sen},
  year={2005}
}
We propose a formula for the degeneracy of quarter BPS dyons in a class of CHL models. The formula uses a modular form of a subgroup of the genus two modular group Sp(2, ZZ). Our proposal is S-duality invariant and reproduces correctly the entropy of a dyonic black hole to first non-leading order for large values of the charges. 

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