Journal of High Energy Physics

, 2010:45



  • Frederik Denef
    • Jefferson Physical LaboratoryHarvard University
    • Instituut voor Theoretische FysicaKU Leuven
  • Mboyo Esole
    • Jefferson Physical LaboratoryHarvard University
    • Jefferson Physical LaboratoryHarvard University

DOI: 10.1007/JHEP03(2010)045

Cite this article as:
Denef, F., Esole, M. & Padi, M. J. High Energ. Phys. (2010) 2010: 45. doi:10.1007/JHEP03(2010)045


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 TheorySuperstring Vacua
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© SISSA, Trieste, Italy 2010