TY - JOUR
T1 - D-branes at singularities
T2 - A bottom-up approach to the string embedding of the standard model
AU - Aldazabal, Gerardo
AU - Ibáñez, Luis E.
AU - Quevedo, Fernando
AU - Uranga, Angel M.
PY - 2000
Y1 - 2000
N2 - 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 T6ℤ3 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.
AB - 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 T6ℤ3 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.
KW - Brane Dynamics in Gauge Theories
KW - D-branes
KW - F-Theory
KW - Superstring Vacua
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U2 - 10.1088/1126-6708/2000/08/002
DO - 10.1088/1126-6708/2000/08/002
M3 - Article
AN - SCOPUS:7044264924
SN - 1029-8479
VL - 4
SP - 23
EP - 70
JO - Journal of High Energy Physics
JF - Journal of High Energy Physics
IS - 8 PART A
ER -