2,974 research outputs found
High spin baryon in hot strongly coupled plasma
We consider a strings-junction holographic model of probe baryon in the
finite-temperature supersymmetric Yang-Mills dual of the AdS-Schwarzschild
black hole background. In particular, we investigate the screening length for
high spin baryon composed of rotating N_c heavy quarks. To rotate quarks by
finite force, we put hard infrared cutoff in the bulk and give quarks finite
mass. We find that N_c microscopic strings are embedded reasonably in the bulk
geometry when they have finite angular velocity \omega, similar to the meson
case. By defining the screening length as the critical separation of quarks, we
compute the \omega dependence of the baryon screening length numerically and
obtain a reasonable result which shows that baryons with high spin dissociate
more easily. Finally, we discuss the relation between J and E^2 for baryons.Comment: 18 pages, 19 figures, version to appear in JHE
Image Watermarking in the Linear Canonical Transform Domain
The linear canonical transform, which can be looked at the generalization of the fractional Fourier transform and the Fourier transform, has received much interest and proved to be one of the most powerful tools in fractional signal processing community.
A novel watermarking method associated with the linear canonical transform is proposed in this paper. Firstly, the watermark
embedding and detecting techniques are proposed and discussed based on the discrete linear canonical transform. Then the Lena
image has been used to test this watermarking technique. The simulation results demonstrate that the proposed schemes are robust
to several signal processing methods, including addition of Gaussian noise and resizing. Furthermore, the sensitivity of the single
and double parameters of the linear canonical transform is also discussed, and the results show that the watermark cannot be
detected when the parameters of the linear canonical transform used in the detection are not all the same as the parameters used
in the embedding progress
Quantum state transmission via a spin ladder as a robust data bus
We explore the physical mechanism to coherently transfer the quantum
information of spin by connecting two spins to an isotropic antiferromagnetic
spin ladder system as data bus. Due to a large spin gap existing in such a
perfect medium, the effective Hamiltonian of the two connected spins can be
archived as that of Heisenberg type, which possesses a ground state with
maximal entanglement. We show that the effective coupling strength is inversely
proportional to the distance of the two spins and thus the quantum information
can be transferred between the two spins separated by a longer distance, i.e.
the characteristic time of quantum state transferring linearly depends on the
distance.Comment: 7 pages, 5 figures, 1 tabl
Lorentz transformation in Maxwell equations for slowly moving media
We use the method of field decomposition, a technique widely used in
relativistic magnetohydrodynamics, to study the small velocity approximation
(SVA) of the Lorentz transformation in Maxwell equations for slowly moving
media. The "deformed" Maxwell equations derived under the SVA in the lab frame
can be put into the conventional form of Maxwell equations in the medium's
comoving frame. Our results show that the Lorentz transformation in the SVA up
to ( is the speed of the medium and is the speed of light in
vacuum) is essential to derive these equations: the time and charge density
must also change when transforming to a different frame even in the SVA, not
just the position and current density as in the Galilean transformation. This
marks the essential difference of the Lorentz transformation from the Galilean
one. We show that the integral forms of Faraday and Ampere equations for slowly
moving surfaces are consistent with Maxwell equations. We also present Faraday
equation the covariant integral form in which the electromotive force can be
defined as a Lorentz scalar independent of the observer's frame. No evidences
exist to support an extension or modification of Maxwell equations.Comment: 16 pages, 1 figure, 3 tables. Section VI is added about integral
forms of Faraday and Ampere laws for moving surfaces. Part of Section IV and
V are rewitte
A unified theory for bubble dynamics
In this work, we established a novel theory for the dynamics of oscillating
bubbles such as cavitation bubbles, underwater explosion bubbles, and air
bubbles. For the first time, we proposed bubble dynamics equations that can
simultaneously take into consideration the effects of boundaries, bubble
interaction, ambient flow field, gravity, bubble migration, fluid
compressibility, viscosity, and surface tension while maintaining a unified and
elegant mathematical form. The present theory unifies different classical
bubble equations such as the Rayleigh-Plesset equation, the Gilmore equation,
and the Keller-Miksis equation. Furthermore, we validated the theory with
experimental data of bubbles with a variety in scales, sources, boundaries, and
ambient conditions and showed the advantages of our theory over the classical
theoretical models, followed by a discussion on the applicability of the
present theory based on a comparison to simulation results with different
numerical methods. Finally, as a demonstration of the potential of our theory,
we modeled the complex multi-cycle bubble interaction with wide ranges of
energy and phase differences and gained new physical insights into inter-bubble
energy transfer and coupling of bubble-induced pressure waves
A Novel Approach for Effective Multi-View Clustering with Information-Theoretic Perspective
Multi-view clustering (MVC) is a popular technique for improving clustering
performance using various data sources. However, existing methods primarily
focus on acquiring consistent information while often neglecting the issue of
redundancy across multiple views. This study presents a new approach called
Sufficient Multi-View Clustering (SUMVC) that examines the multi-view
clustering framework from an information-theoretic standpoint. Our proposed
method consists of two parts. Firstly, we develop a simple and reliable
multi-view clustering method SCMVC (simple consistent multi-view clustering)
that employs variational analysis to generate consistent information. Secondly,
we propose a sufficient representation lower bound to enhance consistent
information and minimise unnecessary information among views. The proposed
SUMVC method offers a promising solution to the problem of multi-view
clustering and provides a new perspective for analyzing multi-view data.
To verify the effectiveness of our model, we conducted a theoretical analysis
based on the Bayes Error Rate, and experiments on multiple multi-view datasets
demonstrate the superior performance of SUMVC
Squeezing Microwave Fields via Magnetostrictive Interaction
Squeezed light finds many important applications in quantum information
science and quantum metrology, and has been produced in a variety of physical
systems involving optical nonlinear processes. Here, we show how a nonlinear
magnetostrictive interaction in a ferrimagnet in cavity magnomechanics can be
used to reduce quantum noise of the electromagnetic field. We show optimal
parameter regimes where a substantial and stationary squeezing of the microwave
output field can be achieved. The scheme can be realized within the reach of
current technology in cavity electromagnonics and magnomechanics. Our work
provides a new and practicable approach for producing squeezed vacuum states of
electromagnetic fields, and may find promising applications in quantum
information processing and quantum metrology.Comment: comments are welcom
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