164 research outputs found
Harish-Chandra modules over the \Q Heisenberg-Virasoro Algebra
In this paper, it is proved that all irreducible Harish-Chandra modules over
the \Q Heisenberg-Virasoro algebra are of intermediate series (all weight
spaces are 1-dimensional)
Axion-assisted Resonance Oscillation Rescues the Dodelson-Widrow Mechanism
The scale sterile neutrino was a qualified candidate for dark
matter particles in the Dodelson-Widrow mechanism. But the mixing angle, needed
to provide enough amount of dark matter, is in contradiction with the
astrophysical observations. To alleviate such tension, we introduce an
effective interaction, i.e. , among Standard Model
neutrino , axion , and singlet . The axial-vector
interaction form is determined by the axion shift symmetry, and the singlet
with dynamically varied vacuum expectation value is introduced to
reinforce the axial-vector coupling strength and evade the stringent neutrino
oscillation constraints. The effective potential generated by the new
interaction {could cancel} the SM counterpart, resulting in an {enhanced
converting} probability between SM neutrino and sterile neutrino. Hence, the
production rate of sterile neutrinos can be substantially enlarged with smaller
mixing compared to the DW mechanism.Comment: 5 pages, 2 figure
Correlating Gravitational Waves with -boson Mass, FIMP Dark Matter, and Majorana Seesaw Mechanism
We study a minimal extension of the Standard Model by introducing three
right-handed neutrinos and a new scotogenic scalar doublet, in which the mass
splittings between neutral and charged components are responsible for the
-boson mass newly measured by the CDF collaboration. This model can not only
generate non-vanishing Majorana neutrino masses via the interaction of
right-handed neutrinos and scotogenic scalars, but also explain the Universe's
missing matter in the form of FIMP dark matter. We also study the influence of
the mass splitting on the first order electroweak phase transition, and find
that it can further enhance the transition strength and thus induce
gravitational waves during the phase transition, which may be detected in the
forthcoming detectors such as U-DECIGO.Comment: References updated, accepted for publication in Science Bulleti
Adaptive Pattern Extraction Multi-Task Learning for Multi-Step Conversion Estimations
Multi-task learning (MTL) has been successfully used in many real-world
applications, which aims to simultaneously solve multiple tasks with a single
model. The general idea of multi-task learning is designing kinds of global
parameter sharing mechanism and task-specific feature extractor to improve the
performance of all tasks. However, challenge still remains in balancing the
trade-off of various tasks since model performance is sensitive to the
relationships between them. Less correlated or even conflict tasks will
deteriorate the performance by introducing unhelpful or negative information.
Therefore, it is important to efficiently exploit and learn fine-grained
feature representation corresponding to each task. In this paper, we propose an
Adaptive Pattern Extraction Multi-task (APEM) framework, which is adaptive and
flexible for large-scale industrial application. APEM is able to fully utilize
the feature information by learning the interactions between the input feature
fields and extracted corresponding tasks-specific information. We first
introduce a DeepAuto Group Transformer module to automatically and efficiently
enhance the feature expressivity with a modified set attention mechanism and a
Squeeze-and-Excitation operation. Second, explicit Pattern Selector is
introduced to further enable selectively feature representation learning by
adaptive task-indicator vectors. Empirical evaluations show that APEM
outperforms the state-of-the-art MTL methods on public and real-world financial
services datasets. More importantly, we explore the online performance of APEM
in a real industrial-level recommendation scenario.Comment: 18 pages, 9 figure
Farnesoid X Receptor (FXR) Aggravates Amyloid-β-Triggered Apoptosis by Modulating the cAMP-Response Element-Binding Protein (CREB)/Brain-Derived Neurotrophic Factor (BDNF) Pathway In Vitro
BACKGROUND: Alzheimer’s disease (AD), which results in cognitive deficits, usually occurs in older people and is mainly caused by amyloid beta (Aß) deposits and neurofibrillary tangles. The bile acid receptor, farnesoid X receptor (FXR), has been extensively studied in cardiovascular diseases and digestive diseases. However, the role of FXR in AD is not yet understood. The purpose of the present study was to investigate the mechanism of FXR function in AD.
MATERIAL AND METHODS: Lentivirus infection, flow cytometry, real-time PCR, and western blotting were used to detect the gain or loss of FXR in cell apoptosis induced by Aß. Co-immunoprecipitation was used to analyze the molecular partners involved in Aß-induced apoptosis.
RESULTS: We found that the mRNA and protein expression of FXR was enhanced in Ab-triggered neuronal apoptosis in differentiated SH-SY5Y cells and in mouse hippocampal neurons. Overexpression of FXR aggravated Aß-triggered neuronal apoptosis in differentiated SH-SY5Y cells, and this effect was further increased by treatment with the FXR agonist 6ECDCA. Molecular mechanism analysis by co-immunoprecipitation and immunoblotting revealed that FXR interacted with the cAMP-response element-binding protein (CREB), leading to decreased CREB and brain-derived neurotrophic factor (BDNF) protein levels. Low expression of FXR mostly reversed the Aß-triggered neuronal apoptosis effect and prevented the reduction in CREB and BDNF.
CONCLUSIONS: These data suggest that FXR regulates Aß-induced neuronal apoptosis, which may be dependent on the CREB/BDNF signaling pathway in vitro
- …