334 research outputs found
SU(3)_LxU(1)_N Model for Right-Handed Neutrino Neutral Currents
A model based on the \mbox{SU(3)}_L\otimes \mbox{U(1)}_N gauge group, in
which neutrinos have right-handed neutral currents is considered. We argue that
in order to have a result consistent with low-energy one, the right-handed
neutrino component must be treated as correction instead of an equivalent spin
state.Comment: 6 pages, Latex, no figures, Accepted for publication in Phys. Rev.
Improving Pareto Front Learning via Multi-Sample Hypernetworks
Pareto Front Learning (PFL) was recently introduced as an effective approach
to obtain a mapping function from a given trade-off vector to a solution on the
Pareto front, which solves the multi-objective optimization (MOO) problem. Due
to the inherent trade-off between conflicting objectives, PFL offers a flexible
approach in many scenarios in which the decision makers can not specify the
preference of one Pareto solution over another, and must switch between them
depending on the situation. However, existing PFL methods ignore the
relationship between the solutions during the optimization process, which
hinders the quality of the obtained front. To overcome this issue, we propose a
novel PFL framework namely PHN-HVI, which employs a hypernetwork to generate
multiple solutions from a set of diverse trade-off preferences and enhance the
quality of the Pareto front by maximizing the Hypervolume indicator defined by
these solutions. The experimental results on several MOO machine learning tasks
show that the proposed framework significantly outperforms the baselines in
producing the trade-off Pareto front.Comment: Accepted to AAAI-2
A Framework for Controllable Pareto Front Learning with Completed Scalarization Functions and its Applications
Pareto Front Learning (PFL) was recently introduced as an efficient method
for approximating the entire Pareto front, the set of all optimal solutions to
a Multi-Objective Optimization (MOO) problem. In the previous work, the mapping
between a preference vector and a Pareto optimal solution is still ambiguous,
rendering its results. This study demonstrates the convergence and completion
aspects of solving MOO with pseudoconvex scalarization functions and combines
them into Hypernetwork in order to offer a comprehensive framework for PFL,
called Controllable Pareto Front Learning. Extensive experiments demonstrate
that our approach is highly accurate and significantly less computationally
expensive than prior methods in term of inference time.Comment: Under Review at Neural Networks Journa
The Higgs Sector of the Minimal 3 3 1 Model Revisited
The mass spectrum and the eigenstates of the Higgs sector of the minimal 3 3
1 model are revisited in detail. There are discrepancies between our results
and previous results by another author.Comment: 20 pages, latex, two figures. One note and one reference are adde
Nucleon instability in a supersymmetric SU(3)_c X SU(3)_L X U(1) model
We construct the supersymmetric version of a model based on the gauge group
SU(3)_c X SU(3)_L X U(1). We discuss the mechanism of baryon number violation
which induces nucleon decay, and derive bounds on the relevant couplings.Comment: 4 pages, Latex, uses axodraw.sty (some comments and references added
The 331 model with right-handed neutrinos
We explore some more consequences of the electroweak
model with right-handed neutrinos. By introducing the mixing angle
, the {\it exact} physical eigenstates for neutral gauge bosons are
obtained. Because of the mixing, there is a modification to the coupling
proportional to . The data from the -decay allows us to fix the
limit for as . >From the neutrino
neutral current scatterings, we estimate a bound for the new neutral gauge
boson mass in the range 300 GeV, and from symmetry-breaking hierarchy a
bound for the new charged and neutral (non-Hermitian) gauge bosons are obtained.Comment: Slight changes in section 5, Latex, 16 page
\mbox{SU}(3)_L \otimes \mbox{U}(1)_N and \mbox{SU}(4)_L \otimes \mbox{U}(1)_N gauge models with right-handed neutrinos
Pisano and Pleitez have introduced an interesting \mbox{SU}(3)_C \otimes
\mbox{SU}(3)_L \otimes \mbox{U}(1)_N gauge model which has the property that
gauge anomaly cancellation requires the number of generations to be a multiple
of 3. We consider generalizing that model to incorporate right-handed
neutrinos. We find that there exists a non-trivial generalization of the
Pisano-Pleitez model with right-handed neutrinos which is actually simpler than
the original model in that symmetry breaking can be achieved with just three
\mbox{SU}(3)_L triplets (rather than 3 \mbox{SU}(3)_L triplets and a
sextet). We also consider a gauge model based on \mbox{SU}(3)_C\otimes
\mbox{SU}(4)_L \otimes \mbox{U}(1)_N symmetry. Both of these new models also
have the feature that the anomalies cancel only when the number of generations
is divisible by 3.Comment: 8, McGill/94-1
S, T, U parameters in model with right-handed neutrinos
The S, T, U parameters in the model with
right -handed neutrinos are calculated. Explicit expressions for the oblique
and Z - Z' mixing contributions are obtained. We show that the bilepton oblique
contributions to S and T parameters are bounded : and . The Z - Z' mixing contribution is positive and above 10%, but it will
increase fastly with the higher Z' mass. %can be negative. The consequent mass
splitting of the bilepton is derived and to be 15%. The limit on the mass of
the neutral bilepton in this model is obtained.Comment: Latex, axodraw.sty used, 3 figures, 18 page
ICARUS-Q: A scalable RFSoC-based control system for superconducting quantum computers
We present a control and measurement setup for superconducting qubits based
on Xilinx 16-channel radio frequency system on chip (RFSoC) device. The
proposed setup consists of four parts: multiple RFSoC boards, a setup to
synchronise every digital to analog converter (DAC), and analog to digital
converter (ADC) channel across multiple boards, a low-noise direct current (DC)
supply for tuning the qubit frequency and cloud access for remotely performing
experiments. We also design the setup to be free of physical mixers. The RFSoC
boards directly generate microwave pulses using sixteen DAC channels up to the
third Nyquist zone which are directly sampled by its eight ADC channels between
the fifth and the ninth zonesComment: Main text: 15 pages, 23 figures Appendix: 2 pages, 2 figure
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