Flat directions, string compactification and three generation models
نویسندگان
چکیده
منابع مشابه
Se p 19 98 Flat directions , String Compactification and 3 Generation Models
We show how identification of absolutely flat directions allows the construction of a new class of compactified string theories with reduced gauge symmetry that may or may not be continuously connected to the original theory. We use this technique to construct a class of 3 generation models with just the Standard Model gauge group after compactification. We discuss the low-energy symmetries nec...
متن کاملThree-family Perturbative String Vacua: Flat Directions and Effective Couplings
The properties of a class of quasi-realistic three-family perturbative heterotic string vacua are addressed. String models in this class generically contain an anomalous U(1), such that the nonzero Fayet-Iliopoulos term triggers certain fields to acquire string scale VEV’s along flat directions. This vacuum shift reduces the rank of the gauge group and generates effective mass terms and effecti...
متن کاملQuark Masses and Flat Directions in String Models
I discuss a method for producing a quasi–realistic inter–generational quark mass hierarchy in string models. This approach involves non–Abelian singlet states developing intermediate scale vacuum expectation values. I summarize recent investigations into string model realization of this. Talk presented at QCD98, Paris, France, 1–6 June 1998.
متن کاملPhenomenological Survey of a Minimal Superstring Standard Model 1 Flat Directions in Three–generation Heterotic–string Models
We discuss a heterotic–string solution in which the observable sector effective field theory just below the string scale reduces to that of the MSSM, with the standard observable gauge group being just SU(3)C × SU(2)L × U(1)Y and the SU(3)C × SU(2)L × U(1)Y –charged spectrum of the observable sector consisting solely of the MSSM spectrum. Associated with this model is a set of distinct flat dir...
متن کاملFlat Directions in Left–Right Symmetric String Derived Models
The only string models known to reproduce the Minimal Supersymmetric Standard Model in the low energy effective field theory are those constructed in the free fermionic formulation. We demonstrate the existence of quasi– realistic free fermionic heterotic–string models in which supersymmetric singlet flat directions do not exist. This raises the possibility that supersymmetry is broken perturba...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nuclear Physics B
سال: 1999
ISSN: 0550-3213
DOI: 10.1016/s0550-3213(99)00249-7