234 research outputs found
An Explicit SU(12) Family and Flavor Unification Model
An explicit SUSY SU(12) unification model with three light chiral families is
presented which avoids any external flavor symmetries. The hierarchy of quark
and lepton masses and mixings is explained by higher dimensional Yukawa
interactions involving Higgs bosons containing SU(5) singlet fields with VEVs
appearing at or below the SUSY GUT scale of 2 \times 10^{16} GeV, approximately
50 times smaller than the SU(12) unification scale. The model has been found to
be in good agreement with the observed quark and lepton masses and mixings,
with nearly all prefactors of O(1) in the four Dirac and one Majorana fermion
mass matrices.Comment: 7 pages, in proceedings of the CETUP*2012 Workshop, Lead, SD, 10 July
- 1 August 201
Tracking quintessence and k-essence in a general cosmological background
We derive conditions for stable tracker solutions for both quintessence and
k-essence in a general cosmological background, H^2 \propto f(\rho). We find
that tracker solutions are possible only when \eta = d ln f /d ln \rho is
constant, aside from a few special cases, which are enumerated. Expressions for
the quintessence or k-essence equation of state are derived as a function of
\eta and the equation of state of the dominant background component.Comment: 6 pages, no figure
Natural fermion mass hierarchy and mixings in family unification
We present an SU(9) model of family unification with three light chiral
families, and a natural hierarchy of charged fermion masses and mixings. The
existence of singlet right handed neutrions with masses about two orders of
magnitude smaller than the GUT scale, as needed to understand the light
neutrinos masses via the see-saw mechanism, is compelling in our model.Comment: 7 pages, no figur
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