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Chaos modified wall formula damping of the surface motion of a cavity undergoing fissionlike shape evolutions  [PDF]
Santanu Pal,Tapan Mukhopadhyay
Physics , 1997, DOI: 10.1103/PhysRevC.57.210
Abstract: The chaos weighted wall formula developed earlier for systems with partially chaotic single particle motion is applied to large amplitude collective motions similar to those in nuclear fission. Considering an ideal gas in a cavity undergoing fission-like shape evolutions, the irreversible energy transfer to the gas is dynamically calculated and compared with the prediction of the chaos weighted wall formula. We conclude that the chaos weighted wall formula provides a fairly accurate description of one body dissipation in dynamical systems similar to fissioning nuclei. We also find a qualitative similarity between the phenomenological friction in nuclear fission and the chaos weighted wall formula. This provides further evidence for one body nature of the dissipative force acting in a fissioning nucleus.
Quantization of Chaos for Particle Motion  [PDF]
H. Y. Cui
Physics , 2001,
Abstract: We propose a formalism which makes the chaos to be quantized. Quantum mechanical equation is derived for describing the chaos for a particle moving in an electromagnetic field.
Chaos and Complexity of quantum motion  [PDF]
Tomaz Prosen
Physics , 2007, DOI: 10.1088/1751-8113/40/28/S02
Abstract: The problem of characterizing complexity of quantum dynamics - in particular of locally interacting chains of quantum particles - will be reviewed and discussed from several different perspectives: (i) stability of motion against external perturbations and decoherence, (ii) efficiency of quantum simulation in terms of classical computation and entanglement production in operator spaces, (iii) quantum transport, relaxation to equilibrium and quantum mixing, and (iv) computation of quantum dynamical entropies. Discussions of all these criteria will be confronted with the established criteria of integrability or quantum chaos, and sometimes quite surprising conclusions are found. Some conjectures and interesting open problems in ergodic theory of the quantum many problem are suggested.
Microscopic chaos from Brownian motion?  [PDF]
C. P. Dettmann,E. G. D. Cohen,H. van Beijeren
Physics , 1999, DOI: 10.1038/44759
Abstract: A recent experiment on Brownian motion has been interpreted to exhibit direct evidence for microscopic chaos. In this note we demonstrate that virtually identical results can be obtained numerically using a manifestly microscopically nonchaotic system.
Signatures of homoclinic motion in quantum chaos  [PDF]
D. A. Wisniacki,E. Vergini,R. M. Benito,F. Borondo
Physics , 2004, DOI: 10.1103/PhysRevLett.94.054101
Abstract: Homoclinic motion plays a key role in the organization of classical chaos in Hamiltonian systems. In this Letter, we show that it also imprints a clear signature in the corresponding quantum spectra. By numerically studying the fluctuations of the widths of wavefunctions localized along periodic orbits we reveal the existence of an oscillatory behavior, that is explained solely in terms of the primary homoclinic motion. Furthermore, our results indicate that it survives the semiclassical limit.
Halfvortices in flat nanomagnets  [PDF]
Gia-Wei Chern,D. Clarke,H. Youk,O. Tchernyshyov
Physics , 2010, DOI: 10.1007/978-1-4020-8512-3_3
Abstract: We discuss a new type of topological defect in XY systems where the O(2) symmetry is broken in the presence of a boundary. Of particular interest is the appearance of such defects in nanomagnets with a planar geometry. They are manifested as kinks of magnetization along the edge and can be viewed as halfvortices with winding numbers \pm 1/2. We argue that halfvortices play a role equally important to that of ordinary vortices in the statics and dynamics of flat nanomagnets. Domain walls found in experiments and numerical simulations are composite objects containing two or more of these elementary defects. We also discuss a closely related system: the two-dimensional smectic liquid crystal films with planar boundary condition.
Supercurrent induced domain wall motion  [PDF]
P. D. Sacramento,L. C. Fernandes Silva,G. S. Nunes,M. A. N. Araujo,V. R. Vieira
Physics , 2011, DOI: 10.1103/PhysRevB.83.054403
Abstract: We study the dynamics of a magnetic domain wall, inserted in, or juxtaposed to, a conventional superconductor, via the passage of a spin polarized current through a FSF junction. Solving the Landau-Lifshitz-Gilbert equation of motion for the magnetic moments we calculate the velocity of the domain wall and compare it with the case of a FNF junction. We find that in several regimes the domain wall velocity is larger when it is driven by a supercurrent.
Domain Wall Spacetimes and Particle Motion  [PDF]
Richard Gass,Manash Mukherjee
Physics , 1999, DOI: 10.1103/PhysRevD.60.065011
Abstract: We present a mathematical framework for generating thick domain wall solutions to the coupled Einstein-scalar field equations which are (locally) plane symmetric. This approach leads naturally to two broad classes of wall-like solutions. The two classes include all previously known thick domain walls. Although one of these classes is static and the other dynamic, the corresponding Einstein-scalar equations share the same mathematical structure independent of the assumption of any reflection symmetry. We also exhibit a class of thick static domain wall spacetimes with different asymptotic vacua. Our analyses of particle motion in such spacetimes raises the interesting possibility that static domain walls will possess a unique experimental signature.
On Quantum Field Brownian Motion, Decoherence and Semiquantum Chaos  [PDF]
Hans-Thomas Elze
Physics , 1995,
Abstract: Entropy production in quantum (field) systems requiring environment-induced decoherence is described in a Gaussian variational approximation. The new phenomenon of Semiquantum Chaos is reported. (Presented at the International Conference on Nonlinear Dynamics, Chaotic and Complex Systems, Zakopane (Poland), 7-12.11.95.)
Learning Deep Representations of Appearance and Motion for Anomalous Event Detection  [PDF]
Dan Xu,Elisa Ricci,Yan Yan,Jingkuan Song,Nicu Sebe
Computer Science , 2015,
Abstract: We present a novel unsupervised deep learning framework for anomalous event detection in complex video scenes. While most existing works merely use hand-crafted appearance and motion features, we propose Appearance and Motion DeepNet (AMDN) which utilizes deep neural networks to automatically learn feature representations. To exploit the complementary information of both appearance and motion patterns, we introduce a novel double fusion framework, combining both the benefits of traditional early fusion and late fusion strategies. Specifically, stacked denoising autoencoders are proposed to separately learn both appearance and motion features as well as a joint representation (early fusion). Based on the learned representations, multiple one-class SVM models are used to predict the anomaly scores of each input, which are then integrated with a late fusion strategy for final anomaly detection. We evaluate the proposed method on two publicly available video surveillance datasets, showing competitive performance with respect to state of the art approaches.
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