Article
Physics, Fluids & Plasmas
Himani Dewan, R. Uma, R. P. Sharma
Summary: This study explores the nonlinear interaction between pump wave and low-frequency ion acoustic wave in magnetized plasma, solving the coupled equations through numerical simulation. The results show the chaotic evolution of KAW and how the dynamics of these two waves are influenced by the plasma beta parameter. The saturated spectra observed are similar to those in various astrophysical scenarios for both low and high beta plasma.
PLASMA PHYSICS AND CONTROLLED FUSION
(2021)
Review
Astronomy & Astrophysics
Maria Fedotova, Dmitry Klimachkov, Arakel Petrosyan
Summary: This article introduces different models and reviews the latest magnetohydrodynamic theories of wave processes in rotating astrophysical plasma, considering important and common properties of astrophysical objects such as compressibility and stratification. It fills the gap in theoretical studies in the field of plasma astrophysics and contributes to improving numerical modeling schemes efficiency.
Review
Multidisciplinary Sciences
Ting Li, Eric Priest, Ruilong Guo
Summary: Magnetic reconnection is a fundamental process in various plasmas, with distinct characteristics in two dimensions compared to three dimensions. The focus here is on three-dimensional reconnection in the plasma environment of the Solar System, particularly solar flares. A new paradigm for solar flares, where three-dimensional reconnection plays a central role, is proposed.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2021)
Review
Chemistry, Multidisciplinary
Sarah Battat, David A. Weitz, George M. Whitesides
Summary: This review focuses on experimental work on nonlinear phenomena in microfluidics, including oscillations, flow-switching behaviors, and bifurcations. The nonlinear behaviors can be induced by the geometry of channels and the manipulation of elements by flowing fluids. Additionally, intermediate Reynolds numbers, non-Newtonian fluids, and liquid metals also contribute to the nonlinear effects. Practical applications include flow gating, mixing, and particle separations.
Article
Optics
Indraj Singh, R. Uma, R. P. Sharma
Summary: A nonlinear wave-based model is introduced to study the ion-scaled magnetic turbulence in laser-produced plasmas. Numerical simulations and semi-analytical methods are used to investigate the nonlinear evolution of the pump wave and the characteristics of turbulent power spectrum. The results are in good agreement with experimental results and provide important insights into simulating astrophysical phenomena and understanding the physics of magnetic turbulence.
Article
Astronomy & Astrophysics
Hava Turkakin, Ian R. Mann, Robert Rankin
Summary: This study investigates the evolution of the Kelvin-Helmholtz instability (KHI) and magnetohydrodynamic (MHD) wave emission at shear-flow boundaries of magnetized plasmas. It finds that significant MHD wave emission occurs not only during the nonlinear stages but also during the KHI's linear stages. These emitted MHD waves can transport energy away from the local region of shear flow, which may have major implications for the evolution of astrophysical objects characterized by fast plasma flow shears.
ASTROPHYSICAL JOURNAL
(2022)
Article
Chemistry, Analytical
Liyi Gu, Chintan Shah, Ruitian Zhang
Summary: The uncertainties in theoretical atomic data are crucial for accurate plasma diagnostics, especially in astrophysical studies. This study presents a new calculation of the uncertainties in current theoretical ion-impact charge exchange atomic data and X-ray spectra, based on comparisons with existing laboratory data. The results show that the average systematic uncertainties are 35-88% for total cross sections and 57-75% for characteristic line ratios. Model deviation increases as collision energy decreases. The errors in total cross sections further contribute to significant uncertainty in the calculation of ionization balance in low-temperature collisional plasmas. Substantial improvements in the atomic database and dedicated laboratory measurements are needed to obtain current models for the next X-ray spectroscopic mission.
Article
Physics, Multidisciplinary
Matthew Goodbred, Yi-Hsin Liu
Summary: We have developed a first-principles model for the relativistic magnetic reconnection rate in strongly magnetized pair plasmas. Our analysis shows that in the magnetically dominated relativistic regime, the x-line thermal pressure is significantly lower than the upstream magnetic pressure, which leads to the collapse of the magnetic field lines and enables fast reconnection. This result is crucial for understanding various extreme astrophysical environments.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Pankaj K. Soni, Harikrishnan Aravindakshan, Bharati Kakad, Amar Kakad
Summary: A test particle simulation was conducted to study resonant interaction of electrons with a stationary electrostatic wave, showing that particle trapping is more efficient in nonthermal plasmas than in thermal plasmas, indicating that particle transport through waves may be more effective in nonthermal plasmas.
Article
Multidisciplinary Sciences
Zhetao Jia, Matteo Secli, Alexander Avdoshkin, Walid Redjem, Elizabeth Dresselhaus, Joel Moore, Boubacar Kante
Summary: Complex networks are crucial in understanding phenomena like collective behavior of spins, neural networks, power grids, and disease spread. Recent studies have used topological phenomena in these networks to maintain system response in the presence of disorder. This article proposes and demonstrates topological structurally disordered systems with enhanced nonlinear phenomena in the topological channels. The construction of the graph and its dynamics significantly increase the rate of topologically protected photon pair generation. Disordered nonlinear topological graphs can enable advanced quantum interconnects, efficient nonlinear sources, and light-based information processing for artificial intelligence.
Article
Engineering, Aerospace
Vladimir A. Sreckovic, Milan S. Dimitrijevic, Ljubinko M. Ignjatovic
Summary: This study investigates the photo-dissociation processes in symmetric and strongly non-symmetric systems involving hydrogen and potassium. The study aims to calculate data for small molecules and molecular state characterizations, as well as obtain corresponding partial and average cross-sections. The research provides spectral absorption rate coefficients for symmetric and strongly non-symmetric cases, which can be used for potential modeling in astrophysical plasma research and laboratory plasma investigation.
ADVANCES IN SPACE RESEARCH
(2023)
Article
Engineering, Chemical
Toshiaki Sakuyama, Yasunori Tanaka
Summary: The thermal polymer-ablation phenomena were investigated through direct irradiation of thermal plasmas to polymer bulk specimens using the inductively coupled thermal plasma (ICTP) technique. Spectroscopic observations and numerical modeling were employed to measure and predict the C-2 vibrational and rotational temperatures, as well as mass and power loss during the ablation process.
PLASMA CHEMISTRY AND PLASMA PROCESSING
(2022)
Review
Multidisciplinary Sciences
Evgeny D. Filippov, Konstantin F. Burdonov, Tatiana A. Pikuz, Igor Yu. Skobelev
Summary: This article provides an overview of the application of X-ray self-emission methods for imaging hydrodynamic astrophysical phenomena in laboratory-scale experiments. The typical diagnostic approaches, their advantages, drawbacks, and application prospects are discussed. The methods prove to be valuable for studying various laboratory astrophysical problems with 2D and even 1D spatial resolution. They reveal the hydrodynamic evolution, spatial shape and structure, as well as important parameters such as electron density and plasma temperature of astrophysical objects and related phenomena, which are crucial for verifying astrophysical models.
Article
Physics, Multidisciplinary
V. I. Berezhiani, Z. N. Osmanov, S. V. Mikeladze
Summary: This study investigates the dynamics of electromagnetic beams carrying angular momentum in degenerate astrophysical electron-positron plasmas. The results show that when the power of the beam exceeds a certain critical value, it breaks up into multiple filaments, eventually forming stable spatial soliton structures with zero field at the center.
Article
Physics, Multidisciplinary
A. Abdikian, S. Vasheghani Farahani
Summary: This study investigates the properties of ion-acoustic solitary waves in plasma structures undergoing rotational motions. The influence of various factors, such as relativistic parameters and temperatures, on the energy packet and instability growth rate of the waves is analyzed. Higher relativistic parameters enhance the instability growth rate, while the ratio of temperatures affects the amplitude-to-width ratio and thus the instability growth rate. The study provides insights into energy transfer in white dwarfs or pulsar magnetospheres.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Astronomy & Astrophysics
Vladimir Zhdankin, Dmitri A. Uzdensky, Gregory R. Werner, Mitchell C. Begelman
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2018)
Article
Astronomy & Astrophysics
G. R. Werner, D. A. Uzdensky, M. C. Begelman, B. Cerutti, K. Nalewajko
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2018)
Article
Physics, Multidisciplinary
Vladimir Zhdankin, Dmitri A. Uzdensky, Gregory R. Werner, Mitchell C. Begelman
PHYSICAL REVIEW LETTERS
(2019)
Article
Astronomy & Astrophysics
Vladimir Zhdankin, Dmitri A. Uzdensky, Gregory R. Werner, Mitchell C. Begelman
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2020)
Article
Astronomy & Astrophysics
J. M. Mehlhaff, G. R. Werner, D. A. Uzdensky, M. C. Begelman
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2020)
Article
Physics, Fluids & Plasmas
Thomas G. Jenkins, Gregory R. Werner, John R. Cary
Summary: This paper discusses the speed-limited particle-in-cell method, which reduces the frequency of electron plasma oscillations while preserving lower-frequency plasma dynamics. By relaxing time step constraints, this approach enables faster simulations for modeling plasmas with nontrivial electron kinetic behavior on ion timescales. The SLPIC method is a fast, accurate, and powerful technique for such plasma modeling.
PHYSICS OF PLASMAS
(2021)
Article
Astronomy & Astrophysics
Amelia M. Hankla, Vladimir Zhdankin, Gregory R. Werner, Dmitri A. Uzdensky, Mitchell C. Begelman
Summary: In this study, the behavior of imbalanced turbulence is investigated using numerical simulations. The results show that the injected electromagnetic momentum can efficiently convert into plasma momentum, resulting in high-speed motion. This discovery has important implications for the study of accretion disc winds in astrophysics.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Physics, Fluids & Plasmas
Gregory R. Werner, Scott Robertson, Thomas G. Jenkins, Andrew M. Chap, John R. Cary
Summary: This paper introduces a method to reduce computational costs in particle-in-cell simulations by artificially reducing the ion/electron mass ratio. The method is applicable to steady-state collisionless, electrostatic systems and can speed up the simulation by the square root of the mass ratio. The paper also discusses other approaches, such as numerical timestepping and speed-limited PIC, which can be used to include additional effects.
PHYSICS OF PLASMAS
(2022)
Article
Astronomy & Astrophysics
Jose Ortuno-Macias, Krzysztof Nalewajko, Dmitri A. Uzdensky, Mitchell C. Begelman, Gregory R. Werner, Alexander Y. Chen, Bhupendra Mishra
Summary: This study investigates the development of MHD instabilities in relativistic magnetized jets through 3D kinetic simulations, finding a dominant kink mode in the central core region and discussing the importance of pressure-driven modes in relativistic jets.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Fabio Bacchini, Lev Arzamasskiy, Vladimir Zhdankin, Gregory R. Werner, Mitchell C. Begelman, Dmitri A. Uzdensky
Summary: The magnetorotational instability (MRI) plays a fundamental role in the dynamics of astrophysical accretion disks, particularly in collisionless accretion flows around supermassive black holes. This instability leads to enhanced angular-momentum transport, nonthermal particle acceleration, and a two-temperature state. However, standard magnetohydrodynamic (MHD) approaches cannot capture the microscopic physics involved in MRI, which motivated the use of kinetic particle-in-cell (PIC) simulations in this study.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
J. M. Mehlhaff, G. R. Werner, D. A. Uzdensky, M. C. Begelman
Summary: Relativistic magnetic reconnection is a powerful mechanism in astrophysics for releasing magnetic energy and energizing particles to produce radiation, with external Compton scattering and pair-regulated Klein-Nishina reconnection potentially explaining steep spectra in radio quasars and black hole accretion disc coronae.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Wong Kai, Vladimir Zhdankin, Dmitri A. Uzdensky, Gregory R. Werner, Mitchell C. Begelman
ASTROPHYSICAL JOURNAL LETTERS
(2020)
Article
Astronomy & Astrophysics
Gregory R. Werner, Alexander A. Philippov, Dmitri A. Uzdensky
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2019)
Article
Astronomy & Astrophysics
Vladimir Zhdankin, Dmitri A. Uzdensky, Gregory R. Werner, Mitchell C. Begelman
ASTROPHYSICAL JOURNAL LETTERS
(2018)