D-branes at singularities: A bottom-up approach to the string embedding of the standard model

Gerardo Aldazabal, Luis E. Ibáñez, Fernando Quevedo, Angel M. Uranga

Research output: Contribution to journalArticlepeer-review


We propose a bottom-up approach to particle physics model building from string theory. We start this program by using configurations of type-IIB D3- and D7-branes located at singularities, combined appropriately to reproduce phenomenologically desirable features. We study in detail ℤN N = 1,0 orbifold singularities leading to SM or LR symmetric gauge group. The unique N = 1 supersymmetric twist leading to three generations is ℤ3, predicting sin2 θw = 3/14 = 0.21, and yielding the simplest semirealistic string models ever built. In the non-supersymmetric case, each ℤN, N > 4, leads to three-generation models, but the Weinberg angle is in general too small. One can obtain a large class of D = 4 compact models by embedding the above structure into a Calabi Yau compactification. We construct explicit examples using T63 orbifolds and orientifolds, with additional antibrane hidden sectors, leading to gravity mediated supersymmetry breaking. We construct an explicit F-theory compactification with unbroken N = 1 supersymmetry, with a three-family LR sector.

Original languageEnglish (US)
Pages (from-to)23-70
Number of pages48
JournalJournal of High Energy Physics
Issue number8 PART A
StatePublished - 2000


  • Brane Dynamics in Gauge Theories
  • D-branes
  • F-Theory
  • Superstring Vacua

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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