4 papers
The persistence of the universal halo profiles
Amr El-Zant
Simple simulations suggest that the phase space structure of haloes identified in cosmological calculations is invariant under the dynamics induced by sinking substructure satellit…
Shaping the central structure in CDM halos
Amr El-Zant, Isaac Shlosman, Yehuda Hoffman
Coupling the dark matter (DM) and baryonic components in galaxies via dynamical friction (by allowing the latter to be clumpy) leads to energy input into the DM. The resulting expa…
On the stability of motion of N-body systems: the effect of the variation of particle number, softening and rotation
Amr El-Zant
Using the Ricci and scalar curvatures of the configuration manifold of gravitational N-body systems, we study the exponential instability in their trajectories. It is found that th…
Stability of motion of N-body systems
A. A. El-Zant
Complications arising from the non-compact nature of the phase space of N-body systems prevent any asymptotic characterization of chaotic behaviour (since no equilibrium final stat…