Dynamical mechanism behind ghosts unveiled in a map complexification

Abstract We estimate formation rates of LB-1-like systems through dynamical interactions in the framework of the theory of stellar evolution before the discovery of the LB-1 system. The LB-1 system contains a ∼70 ${M_{\odot}}$ black hole (BH), a so-called pair instability (PI) gap BH, and a B-type star with solar metallicity, and has nearly zero eccentricity. The most efficient formation mechanism is as follows. In an open cluster, a naked helium star (with ∼20 ${M_{\odot}}$) collides with a heavy main sequence star (with ∼50 ${M_{\odot}}$) which has a B-type companion. The collision results in a binary consisting of the collision product and the B-type star with a high eccentricity. The binary can be circularized through the dynamical tide with radiative damping of the collision product envelope. Finally, the collision product collapses to a PI-gap BH, avoiding pulsational pair instability and pair instability supernovae because its He core is as massive as the pre-colliding naked He star. We find that the number of LB-1-like systems in the Milky Way galaxy is ∼0.01(ρoc/104 ${M_{\odot}}$ pc−3), where ρoc is the initial mass densities of open clusters. If we take into account LB-1-like systems with O-type companion stars, the number increases to ∼0.03(ρoc/104 ${M_{\odot}}$ pc−3). This mechanism can form LB-1-like systems at least ten times more efficiently than the other mechanisms: captures of B-type stars by PI-gap BHs, stellar collisions between other types of stars, and stellar mergers in hierarchical triple systems. We conclude that no dynamical mechanism can explain the presence of the LB-1 system.

Download Full-text

A new dynamical mechanism for major climate shifts

Geophysical Research Letters ◽

10.1029/2007gl030288 ◽

2007 ◽

Vol 34 (13) ◽

pp. n/a-n/a ◽

Cited By ~ 131

Author(s):

Anastasios A. Tsonis ◽

Kyle Swanson ◽

Sergey Kravtsov

Keyword(s):

Dynamical Mechanism ◽

Climate Shifts

Download Full-text

MULTIFRACTAL FLUCTUATIONS OF JIUZHAIGOU TOURISTS BEFORE AND AFTER WENCHUAN EARTHQUAKE

Fractals ◽

10.1142/s0218348x13500011 ◽

2013 ◽

Vol 21 (01) ◽

pp. 1350001 ◽

Cited By ~ 9

Author(s):

KAI SHI ◽

WEN-YONG LI ◽

CHUN-QIONG LIU ◽

ZHENG-WEN HUANG

Keyword(s):

Wenchuan Earthquake ◽

Moving Average ◽

Long Term Memory ◽

Short Term ◽

Dynamical Mechanism ◽

Before And After ◽

Previous State ◽

Multifractal Behavior ◽

Multifractal Nature

In this work, multifractal methods have been successfully used to characterize the temporal fluctuations of daily Jiuzhai Valley domestic and foreign tourists before and after Wenchuan earthquake in China. We used multifractal detrending moving average method (MF-DMA). It showed that Jiuzhai Valley tourism markets are characterized by long-term memory and multifractal nature in. Moreover, the major sources of multifractality are studied. Based on the concept of sliding window, the time evolutions of the multifractal behavior of domestic and foreign tourists were analyzed and the influence of Wenchuan earthquake on Jiuzhai Valley tourism system dynamics were evaluated quantitatively. The study indicates that the inherent dynamical mechanism of Jiuzhai Valley tourism system has not been fundamentally changed from long views, although Jiuzhai Valley tourism system was seriously affected by the Wenchuan earthquake. Jiuzhai Valley tourism system has the ability to restore to its previous state in the short term.

Download Full-text

Dynamical Mechanism for Coexistence of Dispersing Species

Journal of Theoretical Biology ◽

10.1006/jtbi.2001.2404 ◽

2001 ◽

Vol 213 (1) ◽

pp. 53-72 ◽

Cited By ~ 16

Author(s):

MARY ANN HARRISON ◽

YING-CHENG LAI ◽

ROBERT D. HOLT

Keyword(s):

Dynamical Mechanism

Download Full-text

Data-driven modeling decadal-to-centennial ENSO variability and its response to external forcing

10.5194/egusphere-egu21-8370 ◽

2021 ◽

Author(s):

Aleksei Seleznev ◽

Dmitry Mukhin ◽

Andrey Gavrilov ◽

Alexander Feigin

Keyword(s):

Co2 Concentration ◽

Data Driven ◽

Time Interval ◽

Solar Forcing ◽

Russian Science ◽

Dynamical Mechanism ◽

Enso Variability ◽

The Past ◽

Sst Variability ◽

Data Driven Modeling

We investigate the decadal-to-centennial ENSO variability based on nonlinear data-driven stochastic modeling. We construct data-driven model of yearly Ni&#241;o-3.4 indices reconstructed from paleoclimate proxies based on three different sea-surface temperature (SST) databases at the time interval from 1150 to 1995 [1]. The data-driven model is forced by the solar activity and CO2 concentration signals. We find the persistent antiphasing relationship between the solar forcing and Ni&#241;o-3.4 SST on the bicentennial time scale. The dynamical mechanism of such a response is discussed.The work was supported by the Russian Science Foundation (Grant No. 20-62-46056)1. Emile-Geay, J., Cobb, K. M., Mann, M. E., & Wittenberg, A. T. (2013). Estimating Central Equatorial Pacific SST Variability over the Past Millennium. Part II: Reconstructions and Implications, Journal of Climate, 26(7), 2329-2352.

Download Full-text

PARAMETRIC INSTABILITY IN SCALAR GRAVITATIONAL FIELDS

Modern Physics Letters A ◽

10.1142/s0217732312300236 ◽

2012 ◽

Vol 27 (24) ◽

pp. 1230023 ◽

Cited By ~ 1

Author(s):

TREVOR B. DAVIES ◽

CHARLES H.-T. WANG ◽

ROBERT BINGHAM ◽

J. TITO MENDONÇA

Keyword(s):

Gravitational Field ◽

Field Effect ◽

Strong Field ◽

Parametric Instability ◽

Spherically Symmetric ◽

Scalar Tensor Theory ◽

Subsequent Work ◽

Dynamical Mechanism ◽

Gravitational Fields ◽

Tensor Theory

We present a brief review on a new dynamical mechanism for a strong field effect in scalar–tensor theory. Starting with a summary of the essential features of the theory and subsequent work by several authors, we analytically investigate the parametric excitation of a scalar gravitational field in a spherically symmetric radially pulsating neutron star.

Download Full-text

Nonlinear Dynamics of a System of Coupled Oscillators With Essential Stiffness Nonlinearities

Volume 5: 19th Biennial Conference on Mechanical Vibration and Noise, Parts A, B, and C ◽

10.1115/detc2003/vib-48446 ◽

2003 ◽

Cited By ~ 2

Author(s):

Alexander F. Vakakis ◽

Richard H. Rand

Keyword(s):

Normal Modes ◽

Nonlinear Normal Modes ◽

Resonance Capture ◽

Periodic Motions ◽

Internal Resonances ◽

Dynamical Mechanism ◽

Elliptic Orbits ◽

Weakly Coupled ◽

Resonant Dynamics ◽

Nonlinear Normal

We study the resonant dynamics of a two-degree-of-freedom system composed a linear oscillator weakly coupled to a strongly nonlinear one, with an essential (nonlinearizable) cubic stiffness nonlinearity. For the undamped system this leads to a series of internal resonances, depending on the level of (conserved) total energy of oscillation. We study in detail the 1:1 internal resonance, and show that the undamped system possesses stable and unstable synchronous periodic motions (nonlinear normal modes — NNMs), as well as, asynchronous periodic motions (elliptic orbits — EOs). Furthermore, we show that when damping is introduced certain NNMs produce resonance capture phenomena, where a trajectory of the damped dynamics gets ‘captured’ in the neighborhood of a damped NNM before ‘escaping’ and becoming an oscillation with exponentially decaying amplitude. In turn, these resonance captures may lead to passive nonlinear energy pumping phenomena from the linear to the nonlinear oscillator. Thus, sustained resonance capture appears to provide a dynamical mechanism for passively transferring energy from one part of the system to another, in a one-way, irreversible fashion. Numerical integrations confirm the analytical predictions.

Download Full-text

Analysis of Multiobjective Scheduling Model for Emergency Management under Multiresource Combination of Disaster Chains

Complexity ◽

10.1155/2021/2962058 ◽

2021 ◽

Vol 2021 ◽

pp. 1-12

Author(s):

Dan Su ◽

Xiaokang Lei ◽

Yongming Wang ◽

Haijun Wang

Keyword(s):

System Dynamics ◽

Disaster Management ◽

Mutual Influence ◽

Time Lag ◽

Disaster Mitigation ◽

Dynamical Mechanism ◽

Urban Disaster ◽

Disaster Chain ◽

Urban Hazard ◽

Emergency Resource

This paper analyzes the formation mechanism of urban hazard chains. The results demonstrate that the complex interaction between the disaster-bearing bodies under the action of disaster-causing factors is the direct cause of urban hazard chains. The analysis of the energy effects of urban hazard chains shows that the coupling of the excitation energy released by the causative agent and the energy of the disaster-bearing bodies is the fundamental cause of urban hazard chains. Based on the description of the dynamical mechanism of the urban disaster chain system, this paper first sets up a disaster scenario and considers the effect of the time lag to establish a system dynamics model of the urban disaster chain and urban disaster management. The model of urban disaster management system dynamics shows the mutual influence and complementary relationship between disasters and the economy, pointing out that emphasizing the spill-over effects of disaster management systems can improve the effectiveness of disaster mitigation. This study also uses equilibrium entropy and brittle entropy theories to characterize the vulnerability of single-function networks and the degree of brittle association of each lifeline subsystem, respectively, and establishes a model for assessing the sensitivity of lifeline systems to disaster damage. Built on the collection and feedback of information from disaster areas after the occurrence of emergencies, this paper establishes a deterministic multihazard emergency resource dispatches model and an uncertain multihazard emergency resource dispatch model.

Download Full-text

The complexity of ECG signal based on multifractal theories and its nonlinear dynamical mechanism

Chinese Science Bulletin (Chinese Version) ◽

10.1360/n972019-00235 ◽

2019 ◽

Vol 64 (22) ◽

pp. 2332-2341

Author(s):

Zhixiao Wang ◽

Aijun He ◽

Xiaodong Yang ◽

Xuesong Wang ◽

Jun Wang

Keyword(s):

Ecg Signal ◽

Dynamical Mechanism ◽

Nonlinear Dynamical

Download Full-text