Collisionless adiabatic afterglow

Non adiabatic electron behavior through a supercritical perpendicular collisionless shock: Impact of the shock front turbulence

Non-adiabatic electron behaviour due to short-scale electric field structures at collisionless shock waves

Under sufficiently high electric field gradients, electron behaviour within exactly perpendicular shocks is unstable to the so-called trajectory instability. We extend previous work paying special attention to short-scale, highamplitude structures as observed within the electric field profile. Via test particle simulations, we show that such structures can cause the electron distribution to hea...

Under and over-adiabatic electrons through a perpendicular collisionless shock: theory versus simulations

Test particle simulations are performed in order to analyze in detail the dynamics of transmitted electrons through a supercritical, strictly perpendicular, collisionless shock. In addition to adiabatic particles, two distinct nonadiabatic populations are observed surprisingly: (i) first, an over-adiabatic population characterized by an increase in the gyrating velocity higher than that expecte...

Are halos of collisionless cold dark matter collisionless?

We study whether gravitational scattering of halo dark matter particles by subhalos can connect two seemingly independent problems: the abundance of subhalos in dark matter halos and the cuspiness of the halos' inner density profiles. Our numerical experiments indicate that subhalos can cause the collisionless dark matter particles in the centers of main halos to diffuse. Combined with tidal ma...

Topology of collisionless relaxation.

Using extensive molecular dynamics simulations we explore the fine-grained phase space structure of systems with long-range interactions. We find that if the initial phase space particle distribution has no holes, the final stationary distribution will also contain a compact simply connected region. The microscopic holes created by the filamentation of the initial distribution function are alwa...