David Berenstein, Erik Perkins
We consider extensions of the standard model inspired by intersecting D-brane
constructions, in order to address flavor mass textures. We include additional
anomalous gauge symmetries, and scalar fields to break them and to generate
Froggatt-Nielsen mass terms. Green-Schwarz axions are included to cancel mixed
anomalies rendering the models consistent. At low energies, a residual
anomalous global symmetry remains, and its associated pseudo-Goldstone mode
becomes the physical axion, which can be interpreted as an axion arising from
open string modes. General considerations show that such axions are very common
in D-brane models and can be completely incompatible with current bounds.
Astrophysical constraints are placed on the axion both by including neutrino
masses in the Froggatt-Nielsen scheme and considering QCD instanton
contributions to the axion mass. We find simple models where the axion decay
constant is in the allowed range, but only one such minimal model with this
property is free from excessive fine tunings elsewhere. We also note that
generically addressing flavor textures for the CKM matrix leads to
deconstructed extra dimensions.
View original:
http://arxiv.org/abs/1202.2073
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