2D particle-in-cell simulations reveal that weakly magnetized quasi-parallel shocks transition from Bell-dominated (inefficient electron acceleration) to Weibel-dominated (efficient electron acceleration) regimes at an Alfvénic Mach number of ~100.
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Advection-only galactic wind models fail to reproduce observed vertical radio profiles without unrealistic velocities, synchrotron spectra are biased toward young electrons in dense regions, and bremsstrahlung/Coulomb losses cannot be neglected even when subdominant.
A time-dependent model shows that star-disk collisions in TDE systems hosting EMRIs can eject 10^{-3} to 1 solar masses at 0.02-0.1c years after the initial flare, producing radio emission via interaction with circumnuclear material.
Cosmic rays enhance momentum transfer in Kelvin-Helmholtz turbulent shear flows by acting as long-range messengers when their gyroradii are smaller than the shear scale, increasing effective viscosity even when not energetically dominant.
For hybrid simulations of the ion Weibel instability, reliable results require about 9(M_A/30)^0.51 to 30 cells per ion skin depth, with finer grids producing unphysical whistler modes.
Ion injection at perpendicular shocks requires 3D geometry to capture the porosity of downstream magnetic turbulence that lets particles return upstream and gain energy.
Four Solar Orbiter interplanetary shocks show energetic particle pressure dominating upstream, indicating particle-mediated modification of collisionless shocks.
VLA L-band polarization observations of SNR G7.7-3.7 show cocoon morphology from interaction with pre-existing circumstellar shells, with magnetic fields compressed along filaments and RM variations tracing massive progenitor winds.
Derives and validates via PIC simulations a scaling law for nonthermal spectral tails in mildly to strongly magnetized turbulent plasmas, with application to black-hole coronae.
MHD simulations indicate that SKA-Mid Band 5a can detect filamentary polarized emission from ICM magnetic fields at high resolution and sensitivity, allowing inference of turbulence driving scales.
A two-component Galactic source model with supernova remnants below 100 TeV and microquasars above, using charge-dependent cutoffs, accounts for cosmic-ray spectra, composition, and the all-particle spectrum up to PeV energies while ruling out nuclei-dependent cutoffs.
Coherent structures that self-consistently emerge in strong MHD turbulence serve as the dominant sites for localized electric-field intensification and repeated particle acceleration across cosmic plasmas.
citing papers explorer
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Dependence of Particle Acceleration Efficiency on Shock Velocity in Weakly Magnetized Electron-Ion Shocks
2D particle-in-cell simulations reveal that weakly magnetized quasi-parallel shocks transition from Bell-dominated (inefficient electron acceleration) to Weibel-dominated (efficient electron acceleration) regimes at an Alfvénic Mach number of ~100.
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Revisiting radio synchrotron diagnostics in star-forming galaxies
Advection-only galactic wind models fail to reproduce observed vertical radio profiles without unrealistic velocities, synchrotron spectra are biased toward young electrons in dense regions, and bremsstrahlung/Coulomb losses cannot be neglected even when subdominant.
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Delayed Radio Flares in Tidal Disruption Events from Star-Disk Collision Outflows
A time-dependent model shows that star-disk collisions in TDE systems hosting EMRIs can eject 10^{-3} to 1 solar masses at 0.02-0.1c years after the initial flare, producing radio emission via interaction with circumnuclear material.
-
Hybrid Simulations of Supersonic Shear Flows: II) Cosmic Ray Viscosity
Cosmic rays enhance momentum transfer in Kelvin-Helmholtz turbulent shear flows by acting as long-range messengers when their gyroradii are smaller than the shear scale, increasing effective viscosity even when not energetically dominant.
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Ion Weibel Instability in the hybrid framework: the optimal resolution
For hybrid simulations of the ion Weibel instability, reliable results require about 9(M_A/30)^0.51 to 30 cells per ion skin depth, with finer grids producing unphysical whistler modes.
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The role of three-dimensional effects on ion injection and acceleration in perpendicular shocks
Ion injection at perpendicular shocks requires 3D geometry to capture the porosity of downstream magnetic turbulence that lets particles return upstream and gain energy.
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Energetic particle-mediated interplanetary shocks observed by Solar Orbiter
Four Solar Orbiter interplanetary shocks show energetic particle pressure dominating upstream, indicating particle-mediated modification of collisionless shocks.
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The Cocoon from a Massive Star's Death: VLA Radio Polarization Study of Possible Historical Supernova Remnant G7.7$-$3.7
VLA L-band polarization observations of SNR G7.7-3.7 show cocoon morphology from interaction with pre-existing circumstellar shells, with magnetic fields compressed along filaments and RM variations tracing massive progenitor winds.
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On The Nonthermal Power Laws In Magnetized Turbulent Plasmas
Derives and validates via PIC simulations a scaling law for nonthermal spectral tails in mildly to strongly magnetized turbulent plasmas, with application to black-hole coronae.
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Unraveling the Imprints of Fluctuation-dynamo on the Intracluster Medium with the SKA
MHD simulations indicate that SKA-Mid Band 5a can detect filamentary polarized emission from ICM magnetic fields at high resolution and sensitivity, allowing inference of turbulence driving scales.
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Two kinds of Galactic source populations could explain the cosmic-ray observation up to the "knee" region
A two-component Galactic source model with supernova remnants below 100 TeV and microquasars above, using charge-dependent cutoffs, accounts for cosmic-ray spectra, composition, and the all-particle spectrum up to PeV energies while ruling out nuclei-dependent cutoffs.
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Strong MHD Turbulence and Coherent Structures as Drivers of Cosmic Particle Acceleration
Coherent structures that self-consistently emerge in strong MHD turbulence serve as the dominant sites for localized electric-field intensification and repeated particle acceleration across cosmic plasmas.