From strings to the MSSM
نویسندگان
چکیده
We review recent progress in embedding the supersymmetric standard model into string theory. We discuss how, with the incorporation of certain aspects of grand unification, a search strategy can be developed that allows to efficiently find rather large numbers of promising string vacua. Global string-derived models with the following features are discussed: (i) exact MSSM spectrum below the unification scale; (ii) R parity; (iii) hierarchical Yukawa couplings with nontrivial mixing; (iv) solution to the μ problem; (v) see-saw suppressed neutrino masses.
منابع مشابه
The Investigation of the Anti-fungal Activity of Sea Cucumber (Holothuria Leucospilota) Extracts (Body Wall, Guts and White Strings) from Chabahar Bay, Oman Sea
Compounds obtained from marine organisms have been isolated due to their anti-bacterial and antifungal activities. In this study, the antifungal activity of aqueous-methanol, methanol, chloroform and n-hexane extracts of body wall, guts and white strings of sea cucumber (Holothuria leucospilota) collected from Chabahar Bay in 100 to 2000 μg/ml concentrations is discussed. The antifunga...
متن کاملA Fast and Accurate Global Maximum Power Point Tracking Method for Solar Strings under Partial Shading Conditions
This paper presents a model-based approach for the global maximum power point (GMPP) tracking of solar strings under partial shading conditions. In the proposed method, the GMPP voltage is estimated without any need to solve numerically the implicit and nonlinear equations of the photovoltaic (PV) string model. In contrast to the existing methods in which first the locations of all the local pe...
متن کاملStudy of Random Biased d-ary Tries Model
Tries are the most popular data structure on strings. We can construct d-ary tries by using strings over an alphabet leading to d-ary tries. Throughout the paper we assume that strings stored in trie are generated by an appropriate memory less source. In this paper, with a special combinatorial approach we extend their analysis for average profiles to d-ary tries. We use this combinatorial appr...
متن کاملString Theory and the Path to Unification : A Review of Recent Developments ∗ Keith
This is a pedagogical review article surveying the various approaches towards understanding gauge coupling unification within string theory. As is well known, one of the major unsolved problems confronting string phenomenology has been an apparent discrepancy between the scale of gauge coupling unification predicted from string theory, and the unification scale expected within the framework of ...
متن کاملAn SU(5) Heterotic Standard Model
We introduce a new heterotic Standard Model which has precisely the spectrum of the Minimal Supersymmetric Standard Model (MSSM), with no exotic matter. The observable sector has gauge group SU(3)C ×SU(2)L×U(1)Y . Our model is obtained from a compactification of heterotic strings on a Calabi-Yau threefold with Z2 fundamental group, coupled with an invariant SU(5) bundle. Depending on the region...
متن کامل