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Paper   IPM / Physic / 8499
School of Physics
  Title:   Word-Sheet Corrections to Dyons in String Theories: A Laboratory for the Strong OSV Conjecture
  Author(s):  Q. Exirifard
  Status:   Preprint
  Year:  2007
  Supported by:  IPM
The simplest dyons in the toroidal compactifications of type IIB string theory correspond to non-trivial dilaton, NS two form and metric in 10D. Presuming that the NS two form can be considered as torsion (MT conjecture), we construct all the cubic alpha-prime corrections from the known R^4 corrections before utilizing Sen's formalism to evaluate the cubic alpha-prime corrections to the entropy of such simplest dyon. These corrections are found non-vanishing. On the contrary, we argue that the strong OSV conjecture implies they should be vanishing. This conflict validates only one of the strong OSV conjecture or the strong MT conjecture.

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