822 research outputs found
Three fermionic generations on a topological defect in extra dimensions
We suggest a mechanism explaining the origin of three generations of the
Standard Model fermions from one generation in a higher-dimensional theory.
Four-dimensional fermions appear as zero modes trapped in the core of a
topological defect with topological number three. We discuss hierarchical
pattern of masses and mixings which arises in these models.Comment: 19 pages, no figures; v.2: references added, main text unchange
Towards common origin of supersymmetry breaking, compositeness, and gauge mediation
We present a toy model which has the following properties: i) it is strongly
coupled at a certain scale and breaks supersymmetry at this scale; ii) matter
superfields of (one generation of) the Standard Model are effective low energy
degrees of freedom of this strongly coupled theory; iii) direct gauge mediation
of supersymmetry breaking occurs due to messenger superfields that are also
effective low energy degrees of freedom. We discuss the way to generalize this
approach to realistic models with three generations. These models might be
favorable from the point of view of string theory compactifications.Comment: 7 pages, LaTeX, no figures; grant numbers correcte
Neutrino masses with a single generation in the bulk
In a class of multidimensional models, topology of the thick brane provides
three chiral fermionic families with hierarchical masses and mixings in the
effective four-dimensional theory, while the full model contains a single
vector-like generation. We discuss how to incorporate three non-degenerate
neutrino masses in these models with the help of only one singlet bulk fermion.Comment: 16 pages, 1 EPS figur
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