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The Magnetohydrodynamic-Particle-In-Cell Module in Athena++: Implementation and Code Tests
Xiaochen Sun, Xue-Ning Bai
We present a new magnetohydrodynamic-particle-in-cell (MHD-PIC) code integrated into the Athena++ framework. It treats energetic particles as in conventional PIC codes while the re…
On the Role of Gas Cooling in the Dynamics of Circumbinary Disks
Hai-Yang Wang, Xue-Ning Bai, Dong Lai
Hydrodynamical interactions between binaries and circumbinary disks (CBDs) play an important role in a variety of astrophysical systems, from young stellar binaries to supermassive…
Hydrodynamical Simulations of Circumbinary Accretion: Balance between Heating and Cooling
Hai-Yang Wang, Xue-Ning Bai, Dong Lai +1
Hydrodynamical interaction in circumbinary discs (CBDs) plays a crucial role in various astrophysical systems, ranging from young stellar binaries to supermassive black hole binari…
Magnetic Flux Transport in Radiatively Inefficient Accretion Flows and the Pathway towards a Magnetically Arrested Disk
Prasun Dhang, Xue-Ning Bai, Christopher J. White
Large-scale magnetic fields play a vital role in determining the angular momentum transport and generating jets/outflows in the accreting systems, yet their origin remains poorly u…
Towards First-principle Characterization of Cosmic-ray Transport Coefficients from Multi-scale Kinetic Simulations
Xue-Ning Bai
A major uncertainty in understanding the transport and feedback of cosmic-rays (CRs) within and beyond our Galaxy lies in the unknown CR scattering rates, which are primarily deter…
Particle Diffusion and Acceleration in Magnetorotational Instability Turbulence
Xiaochen Sun, Xue-Ning Bai
Hot accretion flows contain collisionless plasmas that are believed to be capable of accelerating particles to very high energies, as a result of turbulence generated by the magnet…