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Persistent mysteries of jet engines, formation, propagation, and particle acceleration: have they been addressed experimentally?
High Energy Astrophysical Phenomena · Submitted 17 Sep 2020
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim Although experiments have indeed helped us to understand certain processes, proof of principle concepts, and benchmarked codes, they have yet to solved an astrophysical jet mystery on their own.
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The abstract, sentence by sentence
The physics of astrophysical jets can be divided into three regimes: (i) engine and launch (ii) propagation and collimation, (iii) dissipation and particle acceleration. Since astrophysical jets comprise a huge range of scales and phenomena, practicality dictates that most studies of jets intentionally or inadvertently focus on one of these regimes, and even therein, one body of work may be simply boundary condition for another. We first discuss long standing persistent mysteries that pertain the physics of each of these regimes, independent of the method used to study them. This discussion makes contact with frontiers of plasma astrophysics more generally. While observations theory, and simulations, and have long been the main tools of the trade, what about laboratory experiments? Jet related experiments have offered controlled studies of specific principles, physical processes, and benchmarks for numerical and theoretical calculations. We discuss what has been done to date on these fronts. Although experiments have indeed helped us to understand certain processes, proof of principle concepts, and benchmarked codes, they have yet to solved an astrophysical jet mystery on their own. A challenge is that experimental tools used for jet-related experiments so far, are typically not machines originally designed for that purpose, or designed with specific astrophysical mysteries in mind. This presents an opportunity for a different way of thinking about the development of future platforms: start with the astrophysical mystery and build an experiment to address it.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | The physics of astrophysical jets can be divided into three regimes: (i) engine and launch (ii) propagation and collimation, (iii) dissipation and particle acceleration. | background 1.00 | 0.08 | 0.03 | asserted 1.00 |
| s1 | Since astrophysical jets comprise a huge range of scales and phenomena, practicality dictates that most studies of jets intentionally or inadvertently focus on one of these regimes, and even therein, one body of work may be simply boundary condition for another. | background 0.99 | 0.06 | 0.03 | asserted 0.87 |
| s2 | We first discuss long standing persistent mysteries that pertain the physics of each of these regimes, independent of the method used to study them. | contribution 0.80 | 0.33 | 0.04 | asserted 0.78 |
| s3 | This discussion makes contact with frontiers of plasma astrophysics more generally. | background 0.60 | 0.22 | 0.03 | asserted 0.85 |
| s4 | While observations theory, and simulations, and have long been the main tools of the trade, what about laboratory experiments? | gap 0.58 | 0.04 | 0.03 | asserted 0.67 |
| s5 | Jet related experiments have offered controlled studies of specific principles, physical processes, and benchmarks for numerical and theoretical calculations. | background 0.93 | 0.06 | 0.05 | asserted 0.99 |
| s6 | We discuss what has been done to date on these fronts. | contribution 0.94 | 0.23 | 0.04 | unclear 0.64 |
| s7 | Although experiments have indeed helped us to understand certain processes, proof of principle concepts, and benchmarked codes, they have yet to solved an astrophysical jet mystery on their own. | gap 0.33 | 0.13 | 0.56 | asserted 1.00 |
| s8 | A challenge is that experimental tools used for jet-related experiments so far, are typically not machines originally designed for that purpose, or designed with specific astrophysical mysteries in mind. | limitation 0.45 | 0.11 | 0.06 | asserted 0.99 |
| s9 | This presents an opportunity for a different way of thinking about the development of future platforms: start with the astrophysical mystery and build an experiment to address it. | future work 0.99 | 0.08 | 0.36 | hedged possibility 0.50 |
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The paper
Original abstract
The physics of astrophysical jets can be divided into three regimes: (i) engine and launch (ii) propagation and collimation, (iii) dissipation and particle acceleration. Since astrophysical jets comprise a huge range of scales and phenomena, practicality dictates that most studies of jets intentionally or inadvertently focus on one of these regimes, and even therein, one body of work may be simply boundary condition for another. We first discuss long standing persistent mysteries that pertain the physics of each of these regimes, independent of the method used to study them. This discussion makes contact with frontiers of plasma astrophysics more generally. While observations theory, and simulations, and have long been the main tools of the trade, what about laboratory experiments? Jet related experiments have offered controlled studies of specific principles, physical processes, and benchmarks for numerical and theoretical calculations. We discuss what has been done to date on these fronts. Although experiments have indeed helped us to understand certain processes, proof of principle concepts, and benchmarked codes, they have yet to solved an astrophysical jet mystery on their own. A challenge is that experimental tools used for jet-related experiments so far, are typically not machines originally designed for that purpose, or designed with specific astrophysical mysteries in mind. This presents an opportunity for a different way of thinking about the development of future platforms: start with the astrophysical mystery and build an experiment to address it.
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How the literature uses it
1 arXiv paper cite this in 2 sentences
What it cites · 134 sentences without a confident label
Uses the method or tool of 1 paper
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Modeling was carried out with 2-D hyrdo simulations using the RAGE code [ref] .
The RAGE radiation-hydrodynamic code · Experiments assessing the collimating influence of ambient density and coaxial wind · 0.99
Cites as support 16 papers
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In some GRMHD simulations that start out with toroidal field or mesoscale poloidal loops in a finite mass disk, the end state seems to converge to a state with a large scale poloidal field. field [ref] , suggesting there maybe some independence of initial state.
Large-Scale Poloidal Magnetic Field Dynamo Leads to Powerful Jets in GRMHD Simulations of Black Hole Accretion with Toroidal Field · In accretion engines, where do large scale magnetic fields come from and what is their role in angular momentum transpor · 0.99
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In some GRMHD simulations that start out with toroidal field or mesoscale poloidal loops in a finite mass disk, the end state seems to converge to a state with a large scale poloidal field. field [ref] , suggesting there maybe some independence of initial state.
General Relativistic Magnetohydrodynamic Simulations of Blandford-Znajek Jets and the Membrane Paradigm · In accretion engines, where do large scale magnetic fields come from and what is their role in angular momentum transpor · 0.99
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All MRI simulations of sufficiently large scale and resolution show evidence for large scale dynamo action that correlates with saturation of the transport coefficients [ref] .
Helicity-Flux-Driven Alpha Effect in Laboratory and Astrophysical Plasmas · In accretion engines, where do large scale magnetic fields come from and what is their role in angular momentum transpor · 0.97
Cites as background 50 papers
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This mechanism [ref] appeals directly to rotational energy extraction from a black hole ergosphere threaded by a magnetic field whose open field lines are anchored at infinity.
General Relativistic Magnetohydrodynamic Simulations of Blandford-Znajek Jets and the Membrane Paradigm · Blandford-Znajek (BZ) mechanism · 0.97
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Whether flux can be advected by the accretion flow has been a long standing question [ref] .
Advection of Magnetic Fields in Accretion Disks: Not So Difficult After All · In accretion engines, where do large scale magnetic fields come from and what is their role in angular momentum transpor · 0.94
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Whether flux can be advected by the accretion flow has been a long standing question [ref] .
Global Evolution of an Accretion Disk with Net Vertical Field: Coronal Accretion, Flux Transport, and Disk Winds · In accretion engines, where do large scale magnetic fields come from and what is their role in angular momentum transpor · 0.94
Discussion
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