5,079 research outputs found
Surface effect on the wrinkling of an elastic sheet under tension
Wrinkling of stretched elastic sheets is widely observed, and the scaling
relations between the amplitude and wavelength of the wrinkles have been
proposed by Cerda and Mahadevan. However, the surface effects should be taken
into account when the sheet is even thinner. The surface energy was considered
in this work, and the discrepancies with the classical theory has been
discussed. A dimensionless parameter has been proposed to represent the
size-dependence. A method of characterizing mechanical properties of thin film
using wrinkles considering surface effects has also been proposed.Comment: 6 pages, no figur
Quantum Action Principle with Generalized Uncertainty Principle
One of the common features in all promising candidates of quantum gravity is
the existence of a minimal length scale, which naturally emerges with a
generalized uncertainty principle, or equivalently a modified commutation
relation. Schwinger's quantum action principle was modified to incorporate this
modification, and was applied to the calculation of the kernel of a free
particle, partly recovering the result previously studied using path integral.Comment: 8 pages, no figur
Canonical bases for the quantum linear supergroups
We give a combinatorial construction for the canonical bases of the
-parts of the quantum enveloping superalgebra \bfU(\mathfrak{gl}_{m|n})
and discuss their relationship with the Kazhdan-Lusztig bases for the quantum
Schur superalgebras \bsS(m|n,r) introduced in \cite{DR}. We will also extend
this relationship to the induced bases for simple polynomial representations of
\bfU(\mathfrak{gl}_{m|n}).Comment: 30 page
A realisation of the quantum linear superalgebra
We reconstruct the quantum enveloping superalgebra over via (finite dimensional) quantum
Schur superalgebras. In particular, we obtain a new basis containing the
standard generators of and explicit
multiplication formulas between the generators and an arbitrary basis element.Comment: 43 page
A note on colored HOMFLY polynomials for hyperbolic knots from WZW models
Using the correspondence between Chern-Simons theories and Wess-Zumino-Witten
models we present the necessary tools to calculate colored HOMFLY polynomials
for hyperbolic knots. For two-bridge hyperbolic knots we derive the colored
HOMFLY invariants in terms of crossing matrices of the underlying
Wess-Zumino-Witten model. Our analysis extends previous works by incorporating
non-trivial multiplicities for the primaries appearing in the crossing
matrices, so as to describe colorings of HOMFLY invariants beyond the totally
symmetric or anti-symmetric representations of SU(N). The crossing matrices
directly relate to 6j-symbols of the quantum group U_q(su(N)). We present
powerful methods to calculate such quantum 6j-symbols for general N. This
allows us to determine previously unknown colored HOMFLY polynomials for
two-bridge hyperbolic knots. We give explicitly the HOMFLY polynomials colored
by the representation {2,1} for two-bridge hyperbolic knots with up to eight
crossings. Yet, the scope of application of our techniques goes beyond knot
theory; e.g., our findings can be used to study correlators in
Wess-Zumino-Witten conformal field theories or -- in the limit to classical
groups -- to determine color factors for Yang Mills amplitudes.Comment: 72 pages, 15 figures; v2: explicit HOMFLY polynomials for more knots
included, refs. added and typos corrected; v3: Appendix with sample
calculation adde
Possible Realization and Protection of Valley-Polarized Quantum Hall Effect in Mn/WS2
By using the first-principles calculations and model analyses, we found that
the combination of defected tungsten disulfide monolayer and sparse manganese
adsorption may give a KK` valley spin splitting up to 210 meV. This system also
has a tunable magnetic anisotropy energy, a clean band gap, and an appropriate
band alignment, with the Fermi level sitting right above the top of valence
bands at the K-valleys. Therefore, it can be used for the realization of the
valley-polarized anomalous Hall effect and for the exploration of other valley
related physics without using optical methods. A protective environment can be
formed by covering it with a hexagonal BN layer, without much disturbance to
the benign properties of Mn/WS2.Comment: 16 pages, 4 figure
Chinese Typeface Transformation with Hierarchical Adversarial Network
In this paper, we explore automated typeface generation through image style
transfer which has shown great promise in natural image generation. Existing
style transfer methods for natural images generally assume that the source and
target images share similar high-frequency features. However, this assumption
is no longer true in typeface transformation. Inspired by the recent
advancement in Generative Adversarial Networks (GANs), we propose a
Hierarchical Adversarial Network (HAN) for typeface transformation. The
proposed HAN consists of two sub-networks: a transfer network and a
hierarchical adversarial discriminator. The transfer network maps characters
from one typeface to another. A unique characteristic of typefaces is that the
same radicals may have quite different appearances in different characters even
under the same typeface. Hence, a stage-decoder is employed by the transfer
network to leverage multiple feature layers, aiming to capture both the global
and local features. The hierarchical adversarial discriminator implicitly
measures data discrepancy between the generated domain and the target domain.
To leverage the complementary discriminating capability of different feature
layers, a hierarchical structure is proposed for the discriminator. We have
experimentally demonstrated that HAN is an effective framework for typeface
transfer and characters restoration.Comment: 8 pages(exclude reference), 6 figure
Cross-Modality Hashing with Partial Correspondence
Learning a hashing function for cross-media search is very desirable due to
its low storage cost and fast query speed. However, the data crawled from
Internet cannot always guarantee good correspondence among different modalities
which affects the learning for hashing function. In this paper, we focus on
cross-modal hashing with partially corresponded data. The data without full
correspondence are made in use to enhance the hashing performance. The
experiments on Wiki and NUS-WIDE datasets demonstrates that the proposed method
outperforms some state-of-the-art hashing approaches with fewer correspondence
information
Coexistence curves and molecule number densities of AdS black holes in the reduced parameter space
In this paper, we investigate the coexistence curves and molecule number
densities of AdS black holes and Gauss-Bonnet AdS black holes.
Specifically, we work with the reduced parameter space and derive the analytic
expressions of the universal coexistence curves that are independent of theory
parameters. Moreover, we obtain the explicit expressions of the physical
quantity describing the difference of the number densities of black hole
molecules between the small and large black hole. It is found that both the
coexistence curve and the difference of the molecule number densities of
AdS black holes coincide with those of RN-AdS black holes. It may be attributed
to the same equation of state they share in the reduced parameter space. The
difference of the molecule number densities between the small and large
Gauss-Bonnet AdS black hole exhibits different behavior. This may be attributed
to the fact that the charge of RN-AdS black hole is non-trivial. Our research
will not only deepen the understanding of both the physics along the
coexistence curve and the underlying microscopic freedom of AdS black holes,
but also highlight the importance of the law of corresponding states
Reducing subspaces for multiplication operators on the Dirichlet space through local inverses and Riemann surface
This paper is devoted to the study of reducing subspaces for multiplication
operator on the Dirichlet space with symbol of finite Blaschke
product. The reducing subspaces of on the Dirichlet space and Bergman
space are related. Our strategy is to use local inverses and Riemann surface to
study the reducing subspaces of on the Bergman space, and we discover
a new way to study the Riemann surface for . By this means,
we determine the reducing subspaces of on the Dirichlet space when the
order of is ; ; and answer some questions of
Douglas-Putinar-Wang \cite{DPW12}
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