6,489,138 research outputs found
Recommended from our members
The Effects of Relationship Commitment and Trust on Business to Consumer Electronic Commerce - The Case of Taiwan
Electronic commerce has gained strong momentum across various industry sectors since the release of the commercial browser of Netscape. However, the sharp meltdown of dot com companies in the past three years inspires us to investigate the causes of failures and the factors of success. We postulated that there is a lack of relationship commitment and trust among the electronic commerce partakers. This paper focuses on the business to consumer segment of the electronic commerce regarding the effects of relationship commitment and trust. After surveying more than 250 online consumers in Taiwan, we found that the commitment and trust factors play vital role in customer retention that support our hypotheses
Parity asymmetric boost invariant plasma in AdS/CFT correspondence
We consider a simple extension to the previously found gravity solution
corresponding to a boost invariant Bjorken plasma, by allowing components that
are asymmetric under parity flipping of the spacetime rapidity. Besides the
question whether this may have a realization in collisions of different species
of projectiles, such as lead-gold collision, our new time dependent gravity
background can serve as a test ground for the recently proposed second order
conformal viscous hydrodynamics. We find that non-trivial parity-asymmetric
effects start to appear at second order in late time expansion, and we map the
corresponding energy-momentum tensor to the second order conformal
hydrodynamics to find certain second order transport coefficients. Our results
are in agreement with the previous results in literature, giving one more
corroborative evidence for the validity of the framework.Comment: 20+4 pages, one figure, v2: reference adde
Electrified plasma in AdS/CFT correspondence
We construct new gravity backgrounds holographic dual to neutral plasma with
U(1) global symmetry in the presence of constant electric field, considering
its full back-reactions to the metric. As the electric field and the induced
current cause a net energy in-flow to the system, the plasma is continually
heated up and the corresponding gravity solution has an expanding horizon.
After proposing a consistent late-time expansion scheme, we present analytic
solutions in the scheme up to next-leading order, and our solutions are new
time-dependent solutions of 5D asymptotic AdS Einstein-Maxwell(-Chern-Simons)
theory. To extract dual CFT stress tensor and U(1) current from the solutions,
we perform a rigorous holographic renormalization of
Einstein-Maxwell-Chern-Simons theory including full back-reactions, which can
in itself be an interesting addition to literatures. As by-products, we obtain
interesting modifications of energy-momentum/current Ward identities due to the
U(1) symmetry and its triangle anomaly.Comment: 27 pages, no figure, v3, minor typos fixed, matches with published
versio
Best Sources Forward: Domain Generalization through Source-Specific Nets
A long standing problem in visual object categorization is the ability of algorithms to generalize across different testing conditions. The problem has been formalized as a covariate shift among the probability distributions generating the training data (source) and the test data (target) and several domain adaptation methods have been proposed to address this issue. While these approaches have considered the single source-single target scenario, it is plausible to have multiple sources and require adaptation to any possible target domain. This last scenario, named Domain Generalization (DG), is the focus of our work. Differently from previous DG methods which learn domain invariant representations from source data, we design a deep network with multiple domain-specific classifiers, each associated to a source domain. At test time we estimate the probabilities that a target sample belongs to each source domain and exploit them to optimally fuse the classifiers predictions. To further improve the generalization ability of our model, we also introduced a domain agnostic component supporting the final classifier. Experiments on two public benchmarks demonstrate the power of our approach
Bridging flavour violation and leptogenesis in SU(3) family models
We reconsider basic, in the sense of minimal field content, Pati-Salam x
SU(3) family models which make use of the Type I see-saw mechanism to reproduce
the observed mixing and mass spectrum in the neutrino sector. The goal of this
is to achieve the observed baryon asymmetry through the thermal decay of the
lightest right-handed neutrino and at the same time to be consistent with the
expected experimental lepton flavour violation sensitivity. This kind of models
have been previously considered but it was not possible to achieve a
compatibility among all of the ingredients mentioned above. We describe then
how different SU(3) messengers, the heavy fields that decouple and produce the
right form of the Yukawa couplings together with the scalars breaking the SU(3)
symmetry, can lead to different Yukawa couplings. This in turn implies
different consequences for flavour violation couplings and conditions for
realizing the right amount of baryon asymmetry through the decay of the
lightest right-handed neutrino. Also a highlight of the present work is a new
fit of the Yukawa textures traditionally embedded in SU(3) family models.Comment: 26 pages, 5 figures, Some typos correcte
Avoidance of Singularity and Global Non-Conservation of Energy in General Relativity
We show that the singularity in the General Theory of Relativity (GTR) is the
expression of a non-Machian feature. It can be avoided with a scale-invariant
dynamical theory, a property lacking in GTR. It is further argued that the
global non-conservation of energy in GTR also results from the lack of
scale-invariance and the field formulation presented by several authors can
only resolve the problem in part. Assuming the global energy conservation, we
propose a negative energy density component with positive equation of state
that can drive the late-time acceleration in the universe, while the positive
component confines to smaller scales.Comment: 10 pages, no figure
- …