2,332 research outputs found
Stability analysis of Lur'e systems with additive delay components via a relaxed matrix inequality
Deep learning assisted jet tomography for the study of Mach cones in QGP
Mach cones are expected to form in the expanding quark-gluon plasma (QGP)
when energetic quarks and gluons (called jets) traverse the hot medium at a
velocity faster than the speed of sound in high-energy heavy-ion collisions.
The shape of the Mach cone and the associated diffusion wake are sensitive to
the initial jet production location and the jet propagation direction relative
to the radial flow because of the distortion by the collective expansion of the
QGP and large density gradient. The shape of jet-induced Mach cones and their
distortions in heavy-ion collisions provide a unique and direct probe of the
dynamical evolution and the equation of state of QGP. However, it is difficult
to identify the Mach cone and the diffusion wake in current experimental
measurements of final hadron distributions because they are averaged over all
possible initial jet production locations and propagation directions. To
overcome this difficulty, we develop a deep learning assisted jet tomography
which uses the full information of the final hadrons from jets to localize the
initial jet production positions. This method can help to constrain the initial
regions of jet production in heavy-ion collisions and enable a differential
study of Mach-cones with different jet path length and orientation relative to
the radial flow of the QGP in heavy-ion collisions
Spin-orbital-angular-momentum-coupled quantum gases
We briefly review the recent progress of theories and experiments on
spin-orbital-angular-momentum (SOAM)-coupled quantum gases. The coupling
between the intrinsic degree of freedom of particles and their external orbital
motions widely exists in universe, and leads to a broad variety of fundamental
phenomena both in the classical physics and quantum mechanics. Recent
realization of synthetic SOAM coupling in cold atoms has attracted a great deal
of attention, and stimulates a large amount of considerations on exotic quantum
phases in both Bose and Fermi gases. In this review, we present a basic idea of
engineering SOAM coupling in neutral atoms, starting from a semiclassical
description of atom-light interaction. Unique features of the single-particle
physics in the presence of SOAM coupling are discussed. The intriguing
ground-state quantum phases of weakly interacting Bose gases are introduced,
with emphasis on a so-called angular stripe phase, which has yet been observed
at present. It is demonstrated how to generate a stable giant vortex in a
SOAM-coupled Fermi superfluid. We also discuss topological characters of a
Fermi superfluid in the presence of SOAM coupling. We then introduce the
experimental achievement of SOAM coupling in Rb Bose gases and its first
observation of phase transitions. The most recent development of SOAM-coupled
Bose gases in experiments is also summarized. Regarding the controllability of
ultracold quantum gases, it opens a new era, on the quantum simulation point of
view, to study the fundamental physics resulted from SOAM coupling as well as
newly emergent quantum phases.Comment: A brief review on the recent progress of
spin-orbital-angular-momentum-coupled quantum gases. Comments are welcom
Stability Analysis of Systems With Time-Varying Delay via Improved Lyapunov-Krasovskii Functionals
MicroRNA-362 induces cell proliferation and apoptosis resistance in gastric cancer by activation of NF-κB signaling
A relaxed quadratic function negative-determination lemma and its application to time-delay systems
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