107,297 research outputs found
Superluminal hidden communication as the underlying mechanism for quantum correlations: constraining models
Since Bell's theorem, it is known that quantum correlations cannot be
described by local variables (LV) alone: if one does not want to abandon
classical mechanisms for correlations, a superluminal form of communication
among the particles must be postulated. A natural question is whether such a
postulate would imply the possibility of superluminal signaling. Here we show
that the assumption of finite-speed superluminal communication indeed leads to
signaling when no LV are present, and more generally when only LV derivable
from quantum statistics are allowed. When the most general LV are allowed, we
prove in a specific case that the model can be made again consistent with
relativity, but the question remains open in general.Comment: 5 pages, 1 figure. For the Proceedings of the Conference DICE 2004
(Piombino, 1-4 Sept. 2004
Extra virgin olive oil use is associated with improved post-prandial blood glucose and LDL cholesterol in healthy subjects
Extra virgin olive oil (EVOO) is a key component of the Mediterranean diet and seems to account for the protective effect against cardiovascular disease. However, the underlying mechanism is still elusive
Deriving an underlying mechanism for discontinuous percolation
Understanding what types of phenomena lead to discontinuous phase transitions
in the connectivity of random networks is an outstanding challenge. Here we
show that a simple stochastic model of graph evolution leads to a discontinuous
percolation transition and we derive the underlying mechanism responsible:
growth by overtaking. Starting from a collection of isolated nodes,
potential edges chosen uniformly at random from the complete graph are examined
one at a time while a cap, , on the maximum allowed component size is
enforced. Edges whose addition would exceed can be simply rejected provided
the accepted fraction of edges never becomes smaller than a function which
decreases with as . We show that if
it is always possible to reject a sampled edge and the growth in the largest
component is dominated by an overtaking mechanism leading to a discontinuous
transition. If , once , there are situations when
a sampled edge must be accepted leading to direct growth dominated by
stochastic fluctuations and a "weakly" discontinuous transition. We also show
that the distribution of component sizes and the evolution of component sizes
are distinct from those previously observed and show no finite size effects for
the range of studied.Comment: 6 pages. Final version appearing in EPL (2012
Elliptical Trajectories in Nonsequential Double Ionization
Using a classical ensemble method, nonsequential double ionization is
predicted to exist with elliptical and circular polarization. Recollision is
found to be the underlying mechanism and it is only possible via elliptical
trajectories.Comment: Submitted to New Journal of Physic
Tako-tsubo cardiomyopathy: Clinical presentation and underlying mechanism
AbstractSince Dr Sato at Hiroshima City Hospital first recognized and reported the concept of tako-tsubo cardiomyopathy in 1990, this disorder has become accepted worldwide as a distinct clinical entity. Tako-tsubo cardiomyopathy is an important disorder as a differential diagnosis of acute myocardial infarction. This disorder usually occurs in postmenopausal women of an advanced age, and is characterized by transient left ventricular apical wall motion abnormalities associated with emotional or physical stress. Typically, left ventricular apical wall motion abnormalities are transient and resolve during a period of days to weeks. The prognosis is generally favorable. However, several acute complications have been reported such as congestive heart failure, cardiac rupture, hypotension, left ventricular apical thrombosis, or Torsade de Pointes. Several possible mechanisms such as multivessel coronary artery spasm, coronary microvascular dysfunction, myocarditis, or catecholamine toxicity have been proposed to explain tako-tsubo cardiomyopathy, but its pathophysiology is not well understood
Universality of underlying mechanism for successful deep learning
An underlying mechanism for successful deep learning (DL) with a limited deep
architecture and dataset, namely VGG-16 on CIFAR-10, was recently presented
based on a quantitative method to measure the quality of a single filter in
each layer. In this method, each filter identifies small clusters of possible
output labels, with additional noise selected as labels out of the clusters.
This feature is progressively sharpened with the layers, resulting in an
enhanced signal-to-noise ratio (SNR) and higher accuracy. In this study, the
suggested universal mechanism is verified for VGG-16 and EfficientNet-B0
trained on the CIFAR-100 and ImageNet datasets with the following main results.
First, the accuracy progressively increases with the layers, whereas the noise
per filter typically progressively decreases. Second, for a given deep
architecture, the maximal error rate increases approximately linearly with the
number of output labels. Third, the average filter cluster size and the number
of clusters per filter at the last convolutional layer adjacent to the output
layer are almost independent of the number of dataset labels in the range [3,
1,000], while a high SNR is preserved. The presented DL mechanism suggests
several techniques, such as applying filter's cluster connections (AFCC), to
improve the computational complexity and accuracy of deep architectures and
furthermore pinpoints the simplification of pre-existing structures while
maintaining their accuracies.Comment: 27 pages,5 figures, 6 tables. arXiv admin note: text overlap with
arXiv:2305.1807
Edge states of a three dimensional kicked rotor
Edge localization is a fascinating quantum phenomenon. In this paper, the
underlying mechanism generating it is presented analytically and verified
numerically for a weakly kicked three-dimensional rotor. Analogy to tight
binding model in solid state physics is used. The edge states result of the
edge at zero angular momentum of the three-dimensional kicked rotor.Comment: 16 pages, 3 figure
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