15,734 research outputs found
One Right-handed Neutrino to Generate Complete Neutrino Mass Spectrum in the Framework of NMSSM
The see-saw mechanism is usually applied to explain the lightness of
neutrinos. The traditional see-saw mechanism introduces at least two
right-handed neutrinos for the realistic neutrino spectrum. In the case of
supersymmetry, loop corrections can also contribute to neutrino masses, which
lead to the possibility to generate the neutrino spectrum by introducing just
one right-handed neutrino. To be realistic, MSSM suffers from the mu problem
and other phenomenological difficulties, so we extend NMSSM (the MSSM with a
singlet S) by introducing one single right-handed neutrino superfield (N) and
relevant phenomenology is discussedComment: 20 pages, 7 figure
Gauge glass in two dimensions
The gauge glass model offers an interesting example of a randomly frustrated
system with a continuous O(2) symmetry. In two dimensions, the existence of a
glass phase at low temperatures has long been disputed among numerical studies.
To resolve this controversy, we examine the behavior of vortices whose movement
generates phase slips that destroy phase rigidity at large distances. Detailed
analytical and numerical studies of the corresponding Coulomb gas problem in a
random potential establish that the ground state, with a finite density of
vortices, is polarizable with a scale-dependent dielectric susceptibility.
Screening by vortex/antivortex pairs of arbitrarily large size is present to
eliminate the logarithmic divergence of the Coulomb energy of a single vortex.
The observed power-law decay of the Coulomb interaction between vortices with
distance in the ground state leads to a power-law divergence of the glass
correlation length with temperature . It is argued that free vortices
possess a bound excitation energy and a nonzero diffusion constant at any
.Comment: 10 pages, no figure, to appear in Proceedings of YKIS 2009 Workshop:
Frontiers of Nonequilibrium Physic
Lepton-portal Dark Matter in Hidden Valley model and the DAMPE recent results
We study the recent cosmic ray excess reported by DAMPE in a Hidden
Valley Model with lepton-portal dark matter. We find the electron-portal can
account for the excess well and satisfy the DM relic density and direct
detection bounds, while electron+muon/electron+muon+tau-portal suffers from
strong constraints from lepton flavor violating observables, such as . We also discuss possible collider signatures of our model, both at the LHC
and a future 100 TeV hadron collider.Comment: invited by Science China, accepted versio
Thermally modified sterile neutrino portal dark matter and gravitational waves from phase transition: The Freeze-in case
We consider the thermal effects into the evaluation of the dark matter
production process. With the assistance of the right handed neutrinos, the
freeze-in massive particle dark matter production history can be modified by
the two-step phase transitions. The kinematic of decay/inverse decay or
annihilation processes can be affected by the finite temperature effects as the
Universe cools down. The history of the symmetry respected by the model can be
revealed by the DM relic abundance evolution processes. The strong first order
electroweak phase transition generated gravitational waves can be probed. The
number of extra scalars for the Hierarchy problem can be probed through the
Higgs off-shell searches at the LHC.Comment: 32 pages, 10 figures, comments welcom
Rare-event induced binding transition of heteropolymers
Sequence heterogeneity broadens the binding transition of a polymer onto a
linear or planar substrate. This effect is analyzed in a real-space
renormalization group scheme designed to capture the statistics of rare events.
In the strongly disordered regime, binding initiates at an exponentially rare
set of ``good contacts''. Renormalization of the contact potential yields a
Kosterlitz-Thouless type transition in any dimension. This and other
predictions are confirmed by extensive numerical simulations of a directed
polymer interacting with a columnar defect.Comment: 4 pages, 3 figure
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