Binary neutron star mergers are expected to produce fast dynamical ejecta, with mildly
relativistic velocities extending to β= v/c> 0.6. In a preceding paper, we derived an analytic …

Fast radio bursts (FRBs) are millisecond transient astrophysical phenomena and bright at
radio frequencies. The emission mechanism, however, remains unsolved yet. One scenario …

For a subpopulation of energetic gamma-ray bursts (GRBs), a moderate baryonic loading
may suffice to power ultra-high-energy cosmic rays (UHECRs). Motivated by this, we study …

Given an increasing number of gamma-ray bursts accompanied by potential kilonovae,
there is a growing importance to advance modelling of kilonova afterglows. In this work, we …

We consider the synchrotron spectrum produced by mildly to highly relativistic collisionless
shocks. Simple analytic formulae are derived for the break frequencies (peak frequency, self …

We study the prompt phase of low-luminosity gamma-ray bursts (ll-GRBs) as potential
source of very-high-energy (VHE) gamma-rays and ultra-high-energy cosmic rays …

The nonthermal acceleration of electrons and ions at an oblique, nonrelativistic shock is
studied using large-scale particle-in-cell simulations in one spatial dimension. Physical …

Hot spots observed at the edges of extended radio lobes in high-power radio galaxies and
quasars mark the position of mildly relativistic termination shock, where the jet bulk kinetic …

Mergers of compact objects [binary neutron stars or neutron star-black hole (NSBH)] with a
substantial mass ratio () are expected to produce a mildly relativistic ejecta within from the …

Particle acceleration at magnetized purely perpendicular relativistic shocks in electron–ion
plasmas is studied by means of two-dimensional particle-in-cell simulations. Magnetized …