23,631 research outputs found
Exotic Fermions and Bosons in the Quartification Model
Exotic fermions of half-integral charges at the TeV energy scale are
predicted by the quartification model of Babu, Ma, and Willenbrock. We add to
these one copy of their scalar analogs and discuss the ensuing phenomenological
implications, i.e. radiative contributions to lepton masses and flavor-changing
leptonic decays.Comment: 7 pages, including 3 figure
Neutrino mixing in the seesaw model
In the seesaw model with hierarchical Dirac masses, the neutrino mixing angle
exhibits the behavior of a narrow resonance. In general, the angle is strongly
suppressed, but it can be maximal for special parameter values. We delineate
the small regions in which this happens, for the two flavor problem. On the
other hand, the physical neutrino masses are hierarchical, in general, except
in a large part of the region in which the mixing angle is sizable, where they
are nearly degenerate. Our general analysis is also applicable to the RGE of
neutrino mass matrix, where we find analytic solutions for the running of
physical parameters, in addition to a complex RGE invariant relating them. It
is also shown that, if one mixing angle is small, the three neutrino problem
reduces to two, two flavor problems.Comment: 19 pages, 4 figures; added new sections on RGE effects and universal
seesaw; version to appear in EPJ
Finite Temperature Phase Diagram in Rotating Bosonic Optical Lattice
Finite temperature phase boundary between superfluid phase and normal state
is analytically derived by studying the stability of normal state in rotating
bosonic optical lattice. We also prove that the oscillation behavior of
critical hopping matrix directly follows the upper boundary of Hofstadter
butterfly as the function of effective magnetic field.Comment: 10 pages, 2 figure
Multiple Timescale Energy Scheduling for Wireless Communication with Energy Harvesting Devices
The primary challenge in wireless communication with energy harvesting devices is to efficiently utilize the harvesting energy such that the data packet transmission could be supported. This challenge stems from not only QoS requirement imposed by the wireless communication application, but also the energy harvesting dynamics and the limited battery capacity. Traditional solar predictable energy harvesting models are perturbed by prediction errors, which could deteriorate the energy management algorithms based on this models. To cope with these issues, we first propose in this paper a non-homogenous Markov chain model based on experimental data, which can accurately describe the solar energy harvesting process in contrast to traditional predictable energy models. Due to different timescale between the energy harvesting process and the wireless data transmission process, we propose a general framework of multiple timescale Markov decision process (MMDP) model to formulate the joint energy scheduling and transmission control problem under different timescales. We then derive the optimal control policies via a joint dynamic programming and value iteration approach. Extensive simulations are carried out to study the performances of the proposed schemes
Weyl points and topological nodal superfluids in a face-centered cubic optical lattice
We point out that a face-centered cubic (FCC) optical lattice, which can be
realised by a simple scheme using three lasers, provides one a highly
controllable platform for creating Weyl points and topological nodal
superfluids in ultracold atoms. In non-interacting systems, Weyl points
automatically arise in the Floquet band structure when shaking such FCC
lattices, and sophisticated design of the tunnelling is not required. More
interestingly, in the presence of attractive interaction between two hyperfine
spin states, which experience the same shaken FCC lattice, a three-dimensional
topological nodal superfluid emerges, and Weyl points show up as the gapless
points in the quasiparticle spectrum. One could either create a double Weyl
point of charge 2, or split it to two Weyl points of charge 1, which can be
moved in the momentum space by tuning the interactions. Correspondingly, the
Fermi arcs at the surface may be linked with each other or separated as
individual ones.Comment: 5 pages, 2 figures in the main text; 2 pages, 2 figures in the
supplemental materia
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