By T-dualizing space-filling D-branes in 4d IIB orientifold compactifications along the three non-internal spatial directions, we obtain black hole bound states living in a universe with a gauged spatial reflection symmetry. We call these objects orientiholes. The gravitational entropy of various IIA orientihole configurations provides an “experimental” estimate of the number of vacua in various sectors of the IIB landscape. Furthermore, basic physical properties of orientiholes map to (sometimes subtle) microscopic features, thus providing a useful alternative viewpoint on a number of issues arising in D-brane model building. More generally, we give orientihole generalizations of recently derived wall crossing formulae, and conjecture a relation to the topological string analogous to the OSV conjecture, but with a linear rather than a quadratic identification of partition functions.


Black Holes in String Theory Superstring Vacua 


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Copyright information

© SISSA, Trieste, Italy 2010

Authors and Affiliations

  1. 1.Jefferson Physical LaboratoryHarvard UniversityCambridgeU.S.A.
  2. 2.Instituut voor Theoretische FysicaKU LeuvenLeuvenBelgium

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