237 research outputs found
Critical behaviors near the (tri-)critical end point of QCD within the NJL model
We investigate the dynamical chiral symmetry breaking and its restoration at
finite density and temperature within the two-flavor Nambu-Jona-Lasinio model,
and mainly focus on the critical behaviors near the critical end point (CEP)
and tricritical point (TCP) of quantum chromodynamics. The multi-solution
region of the Nambu and Wigner ones is determined in the phase diagram for the
massive and massless current quark, respectively. We use the various
susceptibilities to locate the CEP/TCP and then extract the critical exponents
near them. Our calculations reveal that the various susceptibilities share the
same critical behaviors for the physical current quark mass, while they show
different features in the chiral limit
Attractive or Faithful? Popularity-Reinforced Learning for Inspired Headline Generation
With the rapid proliferation of online media sources and published news,
headlines have become increasingly important for attracting readers to news
articles, since users may be overwhelmed with the massive information. In this
paper, we generate inspired headlines that preserve the nature of news articles
and catch the eye of the reader simultaneously. The task of inspired headline
generation can be viewed as a specific form of Headline Generation (HG) task,
with the emphasis on creating an attractive headline from a given news article.
To generate inspired headlines, we propose a novel framework called
POpularity-Reinforced Learning for inspired Headline Generation (PORL-HG).
PORL-HG exploits the extractive-abstractive architecture with 1) Popular Topic
Attention (PTA) for guiding the extractor to select the attractive sentence
from the article and 2) a popularity predictor for guiding the abstractor to
rewrite the attractive sentence. Moreover, since the sentence selection of the
extractor is not differentiable, techniques of reinforcement learning (RL) are
utilized to bridge the gap with rewards obtained from a popularity score
predictor. Through quantitative and qualitative experiments, we show that the
proposed PORL-HG significantly outperforms the state-of-the-art headline
generation models in terms of attractiveness evaluated by both human (71.03%)
and the predictor (at least 27.60%), while the faithfulness of PORL-HG is also
comparable to the state-of-the-art generation model.Comment: AAAI 202
Phase-fluctuation Induced Time-Reversal Symmetry Breaking Normal State
Spontaneous time-reversal symmetry (TRS) breaking plays an important role in
studying strongly correlated unconventional superconductors. When the
superconducting gap functions with different pairing symmetries compete, an
Ising () type symmetry breaking occurs due to the locking of the relative
phase via a second order Josephson coupling. The phase
locking can take place even in the normal state in the phase fluctuation regime
before the onset of superconductivity. If ,
then TRS is broken, otherwise, if , or, , rotational
symmetry is broken leading to a nematic state. In both cases, the order
parameters possess a 4-fermion structure beyond the scope of mean-field theory.
We employ an effective two-component -model assisted by a renormalization
group analysis to address this problem. In addition, a quartetting, or,
charge-``4e", superconductivity can also occur above . Monte-Carlo
simulations are performed and the results are in a good agreement with the
renormalization group analysis. Our results provide useful guidance for
studying novel symmetry breakings in strongly correlated superconductors.Comment: 4+ pages, 3 figures. References are added. Supplementary Material is
updated. Comments are welcom
Strong supersymmetric quantum effects on top quark production at the Fermilab Tevatron
The supersymmetric QCD corrections to top quark pair production by
annihilation in collisions are calculated in the minimal
supersymmetric model. We consider effects of the mixing of the scalar top
quarks on the corrections to the total production cross section at
the Fermilab Tevatron. We found that such correction is less sensitive to
squark mass and gluino mass than in no-mixing case, and in both cases the
corrections can exceed 10\% even if we consider the recent CDF limit on squark
and gluino masses.Comment: 11 pages, 3 figures, accepted by Phys.Lett.B in Apr.1,199
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