On fermion mass hirerachies in MSSM-like quiver models with stringy corrections

Abstract

Using instanton effects, we discuss the problem of fermion mass hierarchies in an MSSM-like Type IIA orientifolded model with U(3) × Sp(1) × U(1) × U(1) gauge symmetry obtained from intersecting D6-branes. In the corresponding four-stack quiver, the different scales of the generated superpotential couplings offer a partial solution to fermion mass hierarchies. Using the known data with neutrino masses τ < ∼ 2 eV, we give the magnitudes of the relevant scales.

Magnetic monopoles from a hidden magnetic symmetry

“…Properly, it is noted that models beyond the SM can be engineered using theories involving extra dimensions and supersymmetry including superstring and M-theories. In this regards, the geometry and the topology of extra dimensions engender abelian gauge symmetries U(1) ′ s and scalar fields S i using different approaches either in the context of M-theory on G2 manifolds or in intersecting type II D-branes wrapping non trivial cycles embedded in Calabi-Yau manifolds [25,26,27,28]. It has been revealed that the scalar fields can play an important role in the elaboration of new physical models extending the SM.…”

Modèles d’intersections des D-branes : un panorama

“…La contribution au superpotentiel est donnée par l'intégrale de chemin sur tous les modes zéro. Ainsi, afin de donner lieu à des termes du superpotentiel, on doit s'assurer que tous les modes zéro non chargés, autres que x et ␣ qui sont présents dans la mesure du superpotentiel, sont projetés ou levés [16][17][18]. C'est le cas où l'instanton est enroulé sur un 3-cycle rigide invariant, qui est une condition qui dépend fortement des détails géo-métriques.…”

Axion from Quivers in Type II Superstrings

“…However, some famous issues mostly related to the hierarchy problem, fermion masses and dark matter are still considered as open questions . In particular, many stringy inspired models have been elaborated exploring either gauge theories obtained from intersecting Type II D‐branes wrapping non trivial cycles in Calabi‐Yau manifolds or M‐theory compactified on G 2 manifolds . In string theory approach, it has been argued that open strings stretched to different stacks of Type II D‐branes produce the SM particle spectrum.…”