GUT and standard-like models in intersecting D-brane worlds

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Title: GUT and standard-like models in intersecting D-brane worlds
Author: Chen, Ching-Ming
Abstract: The main goal of string phenomenology is to find a convincing connection be - tween realistic particle physics and string theory . An extended object called D -brane in string theory is shown as a very powerful tool to resolve phenomenology problems . D -branes , D standing for Dirichlet boundary conditions , naturally appear in the T - dual space along one of the toroidally compactified dimensions in non -perturbative Type I theory . A D -brane forms an U (1 ) gauge group and the group structure can be enriched by Chan -Paton indices with multiple coincided D -branes and orientifold ac - tions . Oribfolds define fixed points of the compactified space and break the theory to N = 1 supersymmetry , and the extended orientifold from world -sheet parity projects the brane image to help cancel the anomalies . Strings at the intersections of two D -branes (Type IIA ) form massless chiral fermions as bi -fundamental representations of the gauge groups of the intersecting branes . With these properties , we construct Grand Unification Theory (GUT ) and standard -like models by intersecting D -brane configuration on T6 / (Z2 ? ? ? ? Z2 ) orientifold . Also , supergravity and geometrical fluxes are introduced to stabilize the moduli . In this dissertation , first a brief review of the D -brane theory is discussed , then the complete construction of D -brane configuration on T6 / (Z2 ? ? ? ? Z2 ) is presented , and finally some realistic Trinification , Pati -Salam , SU (5 ) and flipped SU (5 ) models are constructed and discussed . We present the models both in D -brane wrapping numbers and the corresponding particle spectra .
URI: http : / /hdl .handle .net /1969 .1 /4179
Date: 2006-10-30


GUT and standard-like models in intersecting D-brane worlds. Available electronically from http : / /hdl .handle .net /1969 .1 /4179 .

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