Zachary Davis

Efficient Particle Acceleration in 2.5-dimensional Hybrid-kinetic Simulations of Decaying Supersonic Plasma Turbulence

Keyan Gootkin, Colby C. Haggerty, Damiano Caprioli, Zachary Davis

Abstract Collisionless, turbulent plasmas surround the Earth, from the magnetosphere to the intergalactic medium, and the fluctuations within them affect nearly every field in the space sciences, from space weather forecasts to theories of galaxy formation. Where turbulent motions become supersonic, their …

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Statistics of Current and Vorticity Structures in Relativistic Turbulence

Zachary Davis, Luca Comisso, Colby C. Haggerty, Joonas Nättilä

Abstract Coherent structures created through turbulent cascades play a key role in energy dissipation and particle acceleration. In this work, we investigate both current and vorticity sheets in 3D particle-in-cell simulations of decaying relativistic turbulence in pair plasma by training a self-organizing …

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Statistics of Current and Vorticity Structures in Relativistic Turbulence

Zachary Davis, Luca Comisso, Colby C. Haggerty, Joonas Nättilä

Coherent structures created through turbulent cascades play a key role in energy dissipation and particle acceleration. In this work, we investigate both current and vorticity sheets in 3D particle-in-cell simulations of decaying relativistic turbulence in pair plasma by training a self-organizing map …

Plasma instabilities dominate radioactive transients magnetic fields: the self-confinement of leptons in Type Ia and core-collapse supernovae, and kilonovae

D. Desai, Colby C. Haggerty, Benjamin J. Shappee, Michael A. Tucker et autres

ABSTRACT The light curves of radioactive transients, such as supernovae and kilonovae, are powered by the decay of radioisotopes, which release high-energy leptons through $\beta ^+$ and $\beta ^-$ decays. These leptons deposit energy into the expanding ejecta. As the ejecta density …

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Suppression of Collisionless Magnetic Reconnection in the High Ion β, Strong Guide Field Limit

Carlos A. Giai, Colby C. Haggerty, Michael A. Shay, P. A. Cassak et autres

Abstract In magnetic reconnection, the ion bulk outflow speed and ion heating have been shown to be set by the available reconnecting magnetic energy, i.e., the energy stored in the reconnecting magnetic field (B r ). However, recent simulations, observations, and theoretical …

Tleco: A Toolkit for Modeling Radiative Signatures from Relativistic Outflows

Zachary Davis, Jesús M. Rueda‐Becerril, Dimitrios Giannios

Abstract A wide range of astrophysical sources exhibit extreme and rapidly varying electromagnetic emission indicative of efficient nonthermal particle acceleration. Understanding these sources often involves comparing data with a broad range of theoretical scenarios. To this end, it is beneficial to have …

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Tleco: A Toolkit for Modeling Radiative Signatures from Relativistic Outflows

Zachary Davis, Jesús M. Rueda‐Becerril, Dimitrios Giannios

A wide range of astrophysical sources exhibit extreme and rapidly varying electromagnetic emission indicative of efficient non-thermal particle acceleration. Understanding these sources often involves comparing data with a broad range of theoretical scenarios. To this end, it is beneficial to have tools …

Intermittency and Dissipative Structures Arising from Relativistic Magnetized Turbulence

Zachary Davis, Luca Comisso, Dimitrios Giannios

Abstract Kinetic simulations of relativistic turbulence have significantly advanced our understanding of turbulent particle acceleration. Recent progress has highlighted the need for an updated acceleration theory that can account for particle acceleration within the plasma’s coherent structures. Here, we investigate how intermittency …

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Intermittency and Dissipative Structures Arising from Relativistic Magnetized Turbulence

Zachary Davis, Luca Comisso, Dimitrios Giannios

Kinetic simulations of relativistic turbulence have significantly advanced our understanding of turbulent particle acceleration. Recent progress has highlighted the need for an updated acceleration theory that can account for acceleration within the plasma's coherent structures. Here, we investigate how turbulent intermittency models …

Balancing turbulent heating with radiative cooling in blazars

Zachary Davis, Jesús M. Rueda‐Becerril, Dimitrios Giannios

ABSTRACT Recently, particle-in-cell (PIC) simulations have shown that relativistic turbulence in collisionless plasmas can result in an equilibrium particle distribution function where turbulent heating is balanced by radiative cooling of electrons. Strongly magnetized plasmas are characterized by higher energy peaks and broader …

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