4,442 research outputs found
Naturalness, dark matter, and the muon anomalous magnetic moment in supersymmetric extensions of the standard model with a pseudo-Dirac gluino
We study the naturalness, dark matter, and muon anomalous magnetic moment in
the Supersymmetric Standard Models (SSMs) with a pseudo-Dirac gluino (PDGSSMs)
from hybrid and term supersymmetry (SUSY) breakings. To obtain the
observed dark matter relic density and explain the muon anomalous magnetic
moment, we find that the low energy fine-tuning measures are larger than about
30 due to strong constraints from the LUX and PANDAX experiments. Thus, to
study the natural PDGSSMs, we consider multi-component dark matter and then the
relic density of the lighest supersymmetric particle (LSP) neutralino is
smaller than the correct value. We classify our models into six kinds: (i) Case
A is a general case, which has small low energy fine-tuning measure and can
explain the anomalous magnetic moment of the muon; (ii) Case B with the LSP
neutralino and light stau coannihilation; (iii) Case C with Higgs funnel; (iv)
Case D with Higgsino LSP; (v) Case E with light stau coannihilation and
Higgsino LSP; (vi) Case F with Higgs funnel and Higgsino LSP. We study these
Cases in details, and show that our models can be natural and consistent with
the LUX and PANDAX experiments, as well as explain the muon anomalous magnetic
moment. In particular, all these cases except the stau coannihilation can even
have low energy fine-tuning measures around 10.Comment: 19 pages, 18 figure
Relative Stability and Local Curvature Analysis in Carbon Nanotori
We introduce a concise formalism to characterize nanometer-sized tori based
on carbon nanotubes and to determine their stability by combining {\em ab
initio} density functional calculations with a continuum elasticity theory
approach that requires only shape information. We find that the high strain
energy in nanotori containing only hexagonal rings is significantly reduced in
nanotori containing also other polygons. Our approach allows to determine local
curvature and link it to local strain energy, which is correlated with local
stability and chemical reactivity
Local curvature and stability of two-dimensional systems
We propose a fast method to determine the local curvature in two-dimensional
(2D) systems with arbitrary shape. The curvature information, combined with
elastic constants obtained for a planar system, provides an accurate estimate
of the local stability in the framework of continuum elasticity theory.
Relative stabilities of graphitic structures including fullerenes, nanotubes
and schwarzites, as well as phosphorene nanotubes, calculated using this
approach, agree closely with ab initio density functional calculations. The
continuum elasticity approach can be applied to all 2D structures and is
particularly attractive in complex systems with known structure, where the
quality of parameterized force fields has not been established
Experimental realization of a highly structured search algorithm
The highly structured search algorithm proposed by Hogg[Phys.Rev.Lett.
80,2473(1998)] is implemented experimentally for the 1-SAT problem in a single
search step by using nuclear magnetic resonance technique with two-qubit
sample. It is the first demonstration of the Hogg's algorithm, and can be
readily extended to solving 1-SAT problem for more qubits in one step if the
appropriate samples possessing more qubits are experimentally feasible.Comment: RevTex, 11 pages + 3 pages of figure
RestNet: Boosting Cross-Domain Few-Shot Segmentation with Residual Transformation Network
Cross-domain few-shot segmentation (CD-FSS) aims to achieve semantic
segmentation in previously unseen domains with a limited number of annotated
samples. Although existing CD-FSS models focus on cross-domain feature
transformation, relying exclusively on inter-domain knowledge transfer may lead
to the loss of critical intra-domain information. To this end, we propose a
novel residual transformation network (RestNet) that facilitates knowledge
transfer while retaining the intra-domain support-query feature information.
Specifically, we propose a Semantic Enhanced Anchor Transform (SEAT) module
that maps features to a stable domain-agnostic space using advanced semantics.
Additionally, an Intra-domain Residual Enhancement (IRE) module is designed to
maintain the intra-domain representation of the original discriminant space in
the new space. We also propose a mask prediction strategy based on prototype
fusion to help the model gradually learn how to segment. Our RestNet can
transfer cross-domain knowledge from both inter-domain and intra-domain without
requiring additional fine-tuning. Extensive experiments on ISIC, Chest X-ray,
and FSS-1000 show that our RestNet achieves state-of-the-art performance. Our
code will be available soon.Comment: BMVC 202
Semi-supervised Domain Adaptation via Prototype-based Multi-level Learning
In semi-supervised domain adaptation (SSDA), a few labeled target samples of
each class help the model to transfer knowledge representation from the fully
labeled source domain to the target domain. Many existing methods ignore the
benefits of making full use of the labeled target samples from multi-level. To
make better use of this additional data, we propose a novel Prototype-based
Multi-level Learning (ProML) framework to better tap the potential of labeled
target samples. To achieve intra-domain adaptation, we first introduce a
pseudo-label aggregation based on the intra-domain optimal transport to help
the model align the feature distribution of unlabeled target samples and the
prototype. At the inter-domain level, we propose a cross-domain alignment loss
to help the model use the target prototype for cross-domain knowledge transfer.
We further propose a dual consistency based on prototype similarity and linear
classifier to promote discriminative learning of compact target feature
representation at the batch level. Extensive experiments on three datasets,
including DomainNet, VisDA2017, and Office-Home demonstrate that our proposed
method achieves state-of-the-art performance in SSDA.Comment: IJCAI 202
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