scholarly journals On the Debate Concerning the Proper Characterization of Quantum Dynamical Evolution

2013 ◽  
Vol 80 (5) ◽  
pp. 1125-1136 ◽  
Author(s):  
Michael E. Cuffaro ◽  
Wayne C. Myrvold
Keyword(s):  
Dynamical Evolution ◽  
Quantum Dynamical

The discovery and characterization of 2020 AV2, the first known asteroid in the class of inner-Venus asteroids

2021 ◽  
Author(s):  
Bryce T. Bolin ◽  
Wing-Huen Ip ◽  
Frank J. Masci ◽  
George Helou
Keyword(s):  
Energy Distribution ◽  
Spectral Energy Distribution ◽  
Dynamical Evolution ◽  
Small Population ◽  
Population Models ◽  
Spectral Energy ◽  
Expected Number ◽  
Optical Telescope ◽  
Spectroscopic Observations

<p>Near-Earth asteroid population models predict a small population of asteroids located entirely within the orbit of Venus. We report the discovery of the first inner-Venus asteroid (IVA), 2020 AV<sub>2</sub>, was first detected by the Zwicky Transient Facility (ZTF) on the Samuel Oschin Telescope 48-inch telescope at Palomar Observatory on 2020 January 4. Recovery observations by the Spectral Energy Distribution Machine on the Palomar 60-inch Telescope and the Lulin Optical Telescope at Lulin Observatory in late 2021 November greatly extended its orbit to ~330 days confirm its location inside the orbit of Venus and allowing for detail investigation of its dynamical evolution. In addition, a comparison with the NEO model reveals its likely source location in agreement with recent spectroscopic observations. In addition, we provide an estimate of our observational completeness for detecting inner-Venus asteroids with ZTF with implications on the expected number of their detection.</p>

scholarly journals The dynamical importance of binary systems in young massive star clusters

2015 ◽  
Vol 12 (S316) ◽  
pp. 222-227
Author(s):  
Richard de Grijs ◽  
Chengyuan Li ◽  
Aaron M. Geller
Keyword(s):  
Binary Systems ◽  
Hubble Space Telescope ◽  
Star Clusters ◽  
Dynamical Evolution ◽  
Large Magellanic Cloud ◽  
Cluster Center ◽  
Dynamical Mass ◽  
Mass Segregation ◽  
Cluster Cores

AbstractCharacterization of the binary fractions in star clusters is of fundamental importance for many fields in astrophysics. Observations indicate that the majority of stars are found in binary systems, while most stars with masses greater than 0.5M⊙ are formed in star clusters. In addition, since binaries are on average more massive than single stars, in resolved star clusters these systems are thought to be good tracers of (dynamical) mass segregation. Over time, dynamical evolution through two-body relaxation will cause the most massive objects to migrate to the cluster center, while the relatively lower-mass objects remain in or migrate to orbits at greater radii. This process will globally dominate a cluster’s stellar distribution. However, close encounters involving binary systems may disrupt ‘soft’ binaries. This process will occur more frequently in a cluster’s central, dense region than in its periphery, which may mask the effects of mass segregation. Using high resolution Hubble Space Telescope observations, combined with sophisticated N-body simulations, we investigate the radial distributions of the main-sequence binary fractions in massive young Large Magellanic Cloud star clusters. We show that binary disruption may play an important role on very short timescales, depending on the environmental conditions in the cluster cores. This may lead to radial binary fractions that initially decline in the cluster centers, which is contrary to the effects expected from dynamical mass segregation.

Quantum dynamics of polyatomic dissociative chemisorption on transition metal surfaces: mode specificity and bond selectivity

2016 ◽  
Vol 45 (13) ◽  
pp. 3621-3640 ◽  
Author(s):  
Bin Jiang ◽  
Minghui Yang ◽  
Daiqian Xie ◽  
Hua Guo
Keyword(s):  
Transition Metal ◽  
Potential Energy ◽  
Potential Energy Surfaces ◽  
Quantum Dynamics ◽  
Metal Surfaces ◽  
Dissociative Chemisorption ◽  
Quantum Dynamical ◽  
Transition Metal Surfaces ◽  
Energy Surfaces

Recent advances in quantum dynamical characterization of polyatomic dissociative chemisorption on accurate global potential energy surfaces are critically reviewed.

scholarly journals Entropic Characterization of Quantum States with Maximal Evolution under Given Energy Constraints

Entropy ◽  
2019 ◽  
Vol 21 (8) ◽  
pp. 770 ◽  
Author(s):  
Ana P. Majtey ◽  
Andrea Valdés-Hernández ◽  
César G. Maglione ◽  
Angel R. Plastino
Keyword(s):  
Energy Distribution ◽  
Variational Problem ◽  
Quantum System ◽  
Dynamical Evolution ◽  
Quantum States ◽  
Time Interval ◽  
Expectation Value ◽  
Energy Constraints ◽  
Pure Quantum State

A measure D [ t 1 , t 2 ] for the amount of dynamical evolution exhibited by a quantum system during a time interval [ t 1 , t 2 ] is defined in terms of how distinguishable from each other are, on average, the states of the system at different times. We investigate some properties of the measure D showing that, for increasing values of the interval’s duration, the measure quickly reaches an asymptotic value given by the linear entropy of the energy distribution associated with the system’s (pure) quantum state. This leads to the formulation of an entropic variational problem characterizing the quantum states that exhibit the largest amount of dynamical evolution under energy constraints given by the expectation value of the energy.

scholarly journals Quantum-dynamical characterization of reactive transition states

1991 ◽  
Vol 91 ◽  
pp. 289 ◽  
Author(s):  
David C. Chatfield ◽  
Ronald S. Friedman ◽  
Donald G. Truhlar ◽  
David W. Schwenke
Keyword(s):  
Transition States ◽  
Quantum Dynamical

A NONLINEAR DYNAMICS PERSPECTIVE OF WOLFRAM'S NEW KIND OF SCIENCE PART IV: FROM BERNOULLI SHIFT TO 1/f SPECTRUM

2005 ◽  
Vol 15 (04) ◽  
pp. 1045-1183 ◽  
Author(s):  
LEON O. CHUA ◽  
VALERY I. SBITNEV ◽  
SOOK YOON
Keyword(s):  
Bernoulli Shift ◽  
Dynamical Evolution ◽  
Complete Characterization ◽  
Characteristic Functions ◽  
One Dimensional ◽  
New Concepts ◽  
The Right ◽  
Science Part

By exploiting the new concepts of CA characteristic functions and their associated attractor time-τ maps, a complete characterization of the long-term time-asymptotic behaviors of all 256 one-dimensional CA rules are achieved via a single "probing" random input signal. In particular, the graphs of the time-1 maps of the 256 CA rules represent, in some sense, the generalized Green's functions for Cellular Automata. The asymptotic dynamical evolution on any CA attractor, or invariant orbit, of 206 (out of 256) CA rules can be predicted precisely, by inspection. In particular, a total of 112 CA rules are shown to obey a generalized Bernoulli στ-shift rule, which involves the shifting of any binary string on an attractor, or invariant orbit, either to the left, or to the right, by up to 3 pixels, and followed possibly by a complementation of the resulting bit string. The most intriguing result reported in this paper is the discovery that the four Turing-universal rules [Formula: see text], [Formula: see text], [Formula: see text], and [Formula: see text], and only these rules, exhibit a 1/f power spectrum.

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