Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2004-01-07
Physics
High Energy Physics
High Energy Physics - Theory
PhD-Thesis; LaTeX, 242 pages, 43 figures, gzipped ps-file has < 5 MB; pdf-file has < 3 MB,references and remarks concerning hi
Scientific paper
This thesis contains an introductory chapter on orbifolds. The following chapter explains the foundations of orientifolds. Chapters 4-7 present own research. In chapter 4 we quantize open strings with linear boundary conditions, as they show up in electro-magnetic fields. We quantize the zero-modes for toroidal compactifications, too. As an application we calculate the commutator of the coordinate fields in the case of general constant Neveu-Schwarz U(1)-field strengths. Thereby we confirm previous results on non-commutativity of open string theories in Neveu-Schwarz backgrounds. Chapter 5 reviews the results of a former publication [1] on asymmetric orientifolds, supplemented by some recent insights in connection with chapter 4. Chapter 6 summarizes publication [2] where we investigated to what extend one can build phenomenologically interesting models from toroidal orientifolds. By turning on magnetic fluxes on D9-branes we induce chiral fermions. Most calculations are performed in an (equivalent) T-dual picture. Here the number of chiral fermions is given by the topological intersection number of D-branes. In orientifolds of toroidal compactifications one obtains either non-chiral or non-supersymmetric orientifold solutions. However both properties can be reconciled in orientifolds that are obtained from specific supersymmetric orbifold compactifications. In chapter 7 we present the ``sigma Omega'' -Orientifold on a T^6/Z(4) orbifold. As a very attractive example we investigate a supersymmetric U(4) x U(2)^3_L x U(2)^3_R model that is broken to an MSSM-like model by switching on suitable background fields in the LEEA. This chapter is based on our publication [3]. An appendix is supplemented with formulas applied in the text, as well as proofs to two theorems.
No associations
LandOfFree
N=1 and non-supersymmetric open string theories in six and four space-time dimensions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with N=1 and non-supersymmetric open string theories in six and four space-time dimensions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and N=1 and non-supersymmetric open string theories in six and four space-time dimensions will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-114252