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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15 Pith papers cite this work, alongside 1,211 external citations. Polarity classification is still indexing.
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Structured GRB jet simulations find that local electron cooling shifts the synchrotron cooling break up by over a factor of ten, smooths the transition, produces steeper post-break slopes initially, and originates from a narrow frequency-dependent region behind the shock front.
Late strange-mode pulsations from supermassive stars eject compact, nitrogen-rich gas shells that reproduce the dense circumstellar environments of Little Red Dots before the star collapses into a heavy black hole seed.
This paper derives quantitative correction factors for traditional SSA minimum energy estimates to account for inhomogeneity and non-spherical geometry in emitting regions.
High-resolution simulations demonstrate that two-zone models for GRB early afterglows fail to match hydrodynamic evolution in the Newtonian reverse shock regime before Blandford-McKee self-similarity, causing systematic overpredictions of emission depending on the transition prescription.
An analytical model for multiwavelength synchrotron emission from decelerated quasi-spherical ejecta with energy injection in stratified environments is developed for the deep Newtonian regime of GRB afterglows.
Free neutrons survive r-process freeze-out in fast ejecta of neutron star mergers and their beta-decay heating produces a visible early kilonova precursor for mass fractions above ~0.05.
Relativistic propagation in GRB afterglows filters intrinsic QPOs via equal-arrival-time integration, acting as a stationary low-pass filter for constant Gamma and a time-dependent filter causing frequency drift during deceleration.
Multi-band data for GRB 241025A require an ad-hoc factor-500 increase in shocked-material optical depth to match the observed radio spectral evolution within a structured-jet forward-shock model.
FRB 20240114A shows two epochs with distinct energy distribution indices and waiting time statistics, suggesting different burst types before and after March 21 2024.
New early multi-wavelength data on GRB 230328B shows afterglow with early bump and late achromatic rebrightening at ~4000 s, modeled via MCMC as forward shock plus late energy injection in a dusty S0 host with AV~0.8 and no supernova signature.
Simulations of the BSD instrument for POLAR-2 show it can localize faint GRBs like GRB 170817A to about 1.5 degrees accuracy, meeting requirements for supporting GRB polarimetry.
Simulations indicate that an optimized CTAO strategy could detect GeV-TeV emission from about 5% of GW-associated short GRBs, with detectability depending strongly on jet and viewing angles.
PIC-motivated acceleration models for GRB afterglows predict a GeV-band synchrotron cutoff in low-density short GRBs that current Fermi-LAT data cannot distinguish from the Bohm limit but future observations could.
Next-generation CMB experiments are expected to detect thousands of strongly lensed galaxies to z~6 and proto-clusters, plus tens of thousands of local dusty galaxies and radio sources, enabling new studies of galaxy formation.
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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Moving-mesh simulations of spreading dynamics and local electron cooling in structured gamma-ray burst afterglow jets
Structured GRB jet simulations find that local electron cooling shifts the synchrotron cooling break up by over a factor of ten, smooths the transition, produces steeper post-break slopes initially, and originates from a narrow frequency-dependent region behind the shock front.
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Pulsational mass loss from supermassive stars creates the compact shells of Little Red Dots
Late strange-mode pulsations from supermassive stars eject compact, nitrogen-rich gas shells that reproduce the dense circumstellar environments of Little Red Dots before the star collapses into a heavy black hole seed.
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Towards improved synchrotron self absorption energy estimates: accounting for inhomogeneous and non-spherical emitting regions
This paper derives quantitative correction factors for traditional SSA minimum energy estimates to account for inhomogeneity and non-spherical geometry in emitting regions.
-
Systematic Error in Approximate Models of the GRB Early Afterglow
High-resolution simulations demonstrate that two-zone models for GRB early afterglows fail to match hydrodynamic evolution in the Newtonian reverse shock regime before Blandford-McKee self-similarity, causing systematic overpredictions of emission depending on the transition prescription.
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Deep Newtonian Afterglows: Theoretical Light Curves for Quasi-spherical Outflows
An analytical model for multiwavelength synchrotron emission from decelerated quasi-spherical ejecta with energy injection in stratified environments is developed for the deep Newtonian regime of GRB afterglows.
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Nucleosynthesis in the fast ejecta of a neutron star merger
Free neutrons survive r-process freeze-out in fast ejecta of neutron star mergers and their beta-decay heating produces a visible early kilonova precursor for mass fractions above ~0.05.
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Fireballs' Whispers of Their Central Engine: Relativistic Filtering of Afterglow QPOs
Relativistic propagation in GRB afterglows filters intrinsic QPOs via equal-arrival-time integration, acting as a stationary low-pass filter for constant Gamma and a time-dependent filter causing frequency drift during deceleration.
-
Colour evolution in the radio afterglow of GRB 241025A
Multi-band data for GRB 241025A require an ad-hoc factor-500 increase in shocked-material optical depth to match the observed radio spectral evolution within a structured-jet forward-shock model.
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Signatures of Two Distinct Epochs of FRB 20240114A from January to August 2024 Based on its Energy and Waiting Time Analysis
FRB 20240114A shows two epochs with distinct energy distribution indices and waiting time statistics, suggesting different burst types before and after March 21 2024.
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Earliest simultaneous multi-color optical observations of GRB 230328B: from 41 seconds to the host-galaxy identification
New early multi-wavelength data on GRB 230328B shows afterglow with early bump and late achromatic rebrightening at ~4000 s, modeled via MCMC as forward shock plus late energy injection in a dusty S0 host with AV~0.8 and no supernova signature.
-
Design and preliminary performance study of the broad-band spectrometer detector for POLAR-2
Simulations of the BSD instrument for POLAR-2 show it can localize faint GRBs like GRB 170817A to about 1.5 degrees accuracy, meeting requirements for supporting GRB polarimetry.
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Chasing Gamma-Ray Signals from Binary Neutron Star Coalescences with the Cherenkov Telescope Array: Prospects and Observing Strategies
Simulations indicate that an optimized CTAO strategy could detect GeV-TeV emission from about 5% of GW-associated short GRBs, with detectability depending strongly on jet and viewing angles.
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Maximum Energy of Particles Accelerated in Gamma-Ray Burst Afterglow Shocks
PIC-motivated acceleration models for GRB afterglows predict a GeV-band synchrotron cutoff in low-density short GRBs that current Fermi-LAT data cannot distinguish from the Bohm limit but future observations could.
-
Extragalactic astrophysics with next-generation CMB experiments
Next-generation CMB experiments are expected to detect thousands of strongly lensed galaxies to z~6 and proto-clusters, plus tens of thousands of local dusty galaxies and radio sources, enabling new studies of galaxy formation.