Evidence for heterotic - type I string duality

@article{Polchinski1996EvidenceFH,
  title={Evidence for heterotic - type I string duality},
  author={Joseph Polchinski and Edward Witten},
  journal={Nuclear Physics},
  year={1996},
  volume={460},
  pages={525-540}
}

References

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Is string theory a theory of strings
Enhanced gauge symmetries and K3 surfaces
String theory dynamics in various dimensions
Some Comments On String Dynamics
Three subjects are considered here: a self-dual non-critical string that appears in Type IIB superstring theory at points in ${\rm K3}$ moduli space where the Type IIA theory has extended gauge
Large and small radius in string theory
Dirichlet Branes and Ramond-Ramond charges.
We show that D-branes, extended objects defined by mixed Dirichlet-Neumann boundary conditions, break half the supersymmetries of the type II superstring and carry a complete set of electric and
Combinatorics of boundaries in string theory.
  • Polchinski
  • Physics
    Physical review. D, Particles and fields
  • 1994
TLDR
The case of Dirichlet string theory is focused on, and it is found that the effects of boundaries are naturally weighted by [ital e][sup [minus][ital O](1/[ital g][sub st])].
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