TY - JOUR
T1 - D6-brane splitting on type IIA orientifolds
AU - Cvetič, Mirjam
AU - Langacker, Paul
AU - Li, Tianjun
AU - Liu, Tao
N1 - Funding Information:
We would like to thank A.M. Uranga for useful discussions and G. Shiu for helpful comments. The research was supported in part by the National Science Foundation under Grant No. INT02-03585 (M.C.) and PHY-0070928 (T. Li), by the Department of Energy Grant DOE-EY-76-02-3071 (M.C., P.L., T. Liu) and the Fay R. and Eugene L. Langberg Chair (M.C.).
PY - 2005/3/7
Y1 - 2005/3/7
N2 - We study the open-string moduli of supersymmetric D6-branes, addressing both the string and field theory aspects of D6-brane splitting on type IIA orientifolds induced by open-string moduli higgsing (i.e., their obtaining VEVs). Specifically, we focus on the Z2 × Z2 orientifolds and address the symmetry breaking pattern for D6-branes parallel with the orientifold 6-planes as well as those positioned at angles. We demonstrate that the string theory results, i.e., D6-brane splitting and relocating in internal space, are in one to one correspondence with the field theory results associated with the higgsing of moduli in the antisymmetric representation of Sp(2N) gauge symmetry (for branes parallel with orientifold planes) or adjoint representation of U(N) (for branes at general angles). In particular, the moduli higgsing in the open-string sector results in the change of the gauge structure of D6-branes and thus changes the chiral spectrum and family number as well. As a by-product, we provide the new examples of the supersymmetric standard-like models with the electroweak sector arising from Sp(2N)L × Sp(2N)R gauge symmetry; and one four-family example is free of chiral Standard Model exotics.
AB - We study the open-string moduli of supersymmetric D6-branes, addressing both the string and field theory aspects of D6-brane splitting on type IIA orientifolds induced by open-string moduli higgsing (i.e., their obtaining VEVs). Specifically, we focus on the Z2 × Z2 orientifolds and address the symmetry breaking pattern for D6-branes parallel with the orientifold 6-planes as well as those positioned at angles. We demonstrate that the string theory results, i.e., D6-brane splitting and relocating in internal space, are in one to one correspondence with the field theory results associated with the higgsing of moduli in the antisymmetric representation of Sp(2N) gauge symmetry (for branes parallel with orientifold planes) or adjoint representation of U(N) (for branes at general angles). In particular, the moduli higgsing in the open-string sector results in the change of the gauge structure of D6-branes and thus changes the chiral spectrum and family number as well. As a by-product, we provide the new examples of the supersymmetric standard-like models with the electroweak sector arising from Sp(2N)L × Sp(2N)R gauge symmetry; and one four-family example is free of chiral Standard Model exotics.
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U2 - 10.1016/j.nuclphysb.2004.12.028
DO - 10.1016/j.nuclphysb.2004.12.028
M3 - Article
AN - SCOPUS:13444282549
SN - 0550-3213
VL - 709
SP - 241
EP - 266
JO - Nuclear Physics B
JF - Nuclear Physics B
IS - 1-2
ER -