2 research outputs found
Quark-lepton mass unification at TeV scales
A scenario combining a model of early (TeV) unification of quarks and leptons
with the physics of large extra dimensions provides a natural mechanism linking
quark and lepton masses at TeV scale. This has been dubbed as early
quark-lepton mass unification by one of us (PQH) in one of the two models of
early quark-lepton unification, which are consistent with data, namely SU(4)_PS
\otimes SU(2)_L \otimes SU(2)_R \otimes SU(2)_H. In particular, it focused on
the issue of naturally light Dirac neutrino. The present paper will focus on
similar issues in the other model, namely SU(4)_PS \otimes SU(3)_L \otimes
SU(3)_H.Comment: Accepted for publication in PRD: The new version is in agreement with
the accepted manuscrip
The relic density of shadow dark matter candidates
We present the results of relic density calculations for cold dark matter
candidates coming from a model of dark energy and dark matter, which is
described by an asymptotically free gauge group SU(2)_Z (QZD) with a coupling
constant alpha_Z ~ 1 at very low scale of Lambda_Z ~ 10^(-3) eV while alpha_Z ~
weak coupling at high energies. The dark matter candidates of QZD are two
fermions in the form of weakly interacting massive particles. Our results show
that for masses between 50 and 285 GeV, they can account for either a
considerable fraction or the entire dark matter of the Universe.Comment: Revised version after acceptance in NP