4,897 research outputs found
A revised de Broglie relation in discrete space-time
We introduce a revised de Broglie relation in discrete space-time, and
analyze some possible inferences of the relation.Comment: 6 pages, no figure
Collapse helps to probe the structure of particles
We present a possible method to probe the inner structure of particles based
on one kind of promising dynamical collapse theory. It is shown that the
present decay data of KL meson indicates that quarks have no inner structure.Comment: 4 pages, no figure
Multi-view Point Cloud Registration with Adaptive Convergence Threshold and its Application on 3D Model Retrieval
Multi-view point cloud registration is a hot topic in the communities of
multimedia technology and artificial intelligence (AI). In this paper, we
propose a framework to reconstruct the 3D models by the multi-view point cloud
registration algorithm with adaptive convergence threshold, and subsequently
apply it to 3D model retrieval. The iterative closest point (ICP) algorithm is
implemented combining with the motion average algorithm for the registration of
multi-view point clouds. After the registration process, we design applications
for 3D model retrieval. The geometric saliency map is computed based on the
vertex curvature. The test facial triangle is then generated based on the
saliency map, which is applied to compare with the standard facial triangle.
The face and non-face models are then discriminated. The experiments and
comparisons prove the effectiveness of the proposed framework
Space-time transformation for superluminal signaling
We analyze the possible implication of the existence of superluminal
signaling for space-time structure. A new space-time transformation for
superluminal signaling is presented based on the superluminal synchrony method.
We argue that Lorentz transformation should be replaced by the new
transformation in case of the existence of superluminal signaling. Furthermore,
we discuss the possible existence of absolute frame, and give a possible
practical method to probe it.Comment: 5 pages, no figure
Quantum mechanics and discontinuous motion of particles
We discuss a new realistic interpretation of quantum mechanics based on
discontinuous motion of particles. The historical and logical basis of
discontinuous motion of particles is given. It proves that if there exists only
one kind of physical reality--particles, then the realistic motion of particles
described by quantum mechanics should be discontinuous motion. We further
denote that protective measurement may provide a direct method to confirm the
existence of discontinuous motion of particles.Comment: 21 pages, no figures, submitted to Foundations of Physics Letter
The basis of discontinuous motion
We show that the instant motion of particle should be essentially
discontinuous and random. This gives the logical basis of discontinuous motion.
Since what quantum mechanics describes is the discontinuous motion of
particles, this may also answer the question 'why the quantum?'.Comment: 5 pages, no figure
A suggested interpretation of the quantum theory in terms of discontinuous motion of particles
We present a theory of discontinuous motion of particles in continuous
space-time. We show that the simplest nonrelativistic evolution equation of
such motion is just the Schroedinger equation in quantum mechanics. This
strongly implies what quantum mechanics describes is discontinuous motion of
particles. Considering the fact that space-time may be essentially discrete
when considering gravity, we further present a theory of discontinuous motion
of particles in discrete space-time. We show that its evolution may naturally
result in the dynamical collapse process of the wave function, and this
collapse will bring about the appearance of continuous motion of objects in the
macroscopic world.Comment: 31 pages, no figures. An invited talk in 2000 QinHuangDao Physics
Conferenc
Semi-Supervised Dialogue Policy Learning via Stochastic Reward Estimation
Dialogue policy optimization often obtains feedback until task completion in
task-oriented dialogue systems. This is insufficient for training intermediate
dialogue turns since supervision signals (or rewards) are only provided at the
end of dialogues. To address this issue, reward learning has been introduced to
learn from state-action pairs of an optimal policy to provide turn-by-turn
rewards. This approach requires complete state-action annotations of
human-to-human dialogues (i.e., expert demonstrations), which is labor
intensive. To overcome this limitation, we propose a novel reward learning
approach for semi-supervised policy learning. The proposed approach learns a
dynamics model as the reward function which models dialogue progress (i.e.,
state-action sequences) based on expert demonstrations, either with or without
annotations. The dynamics model computes rewards by predicting whether the
dialogue progress is consistent with expert demonstrations. We further propose
to learn action embeddings for a better generalization of the reward function.
The proposed approach outperforms competitive policy learning baselines on
MultiWOZ, a benchmark multi-domain dataset
Anomalous symmetry protected topological states in interacting fermion systems
The classification and construction of symmetry protected topological (SPT)
phases have been intensively studied in interacting systems recently. To our
surprise, in interacting fermion systems, there exists a new class of the
so-called anomalous SPT (ASPT) states which are only well defined on the
boundary of a trivial fermionic bulk system. We first demonstrate the essential
idea by considering an anomalous topological superconductor with time reversal
symmetry in 2D. The physical reason is that the fermion parity might be
changed locally by certain symmetry action, but is conserved if we introduce a
bulk. Then we discuss the layer structure and systematical construction of ASPT
states in interacting fermion systems in 2D with a total symmetry
. Finally, potential experimental realizations of
ASPT states are also addressed.Comment: published versio
Tetradic motif profiles of horizontal visibility graphs
Network motif analysis is a useful tool for the investigation of complex
networks. We study the profiles of tetradic motifs in horizontal visibility
graphs (HVGs) converted from multifractal binomial measures, fractional
Gaussian noises, and heartbeat rates. The profiles of tetradic motifs contains
the spatial information (visibility) and temporal information (relative
magnitude) among the data points in the corresponding time series. For
multifractal binomial measures, the occurrence frequencies of the tetradic
motifs are determined, which converge to a constant vector
. For fractional Gaussian noises, the motif
occurrence frequencies are found to depend nonlinearly on the Hurst exponent
and the length of time series. These findings suggest the potential ability of
tetradic motif profiles in distinguishing different types of time series.
Finally, we apply the tetradic motif analysis to heartbeat rates of healthy
subjects, congestive heart failure (CHF) subjects, and atrial fibrillation (AF)
subjects. Different subjects can be distinguished from the occurrence
frequencies of tetradic motifs.Comment: 9 pages, 5 figure
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