Dynamics

Harry Varvoglis and Basil Barbanis (Thessaloniki) we study numerically transport in model perturbed integrable Hamiltonians with three degrees of freedom. Main results: If by V(t) we denote the number of cells already visited by a trajectory up to time t and by x(t) the function log(ksi/ksi_0)/t, whose limit for t going to inf is the Lyapunov Characteristic Number (LCN), then

(a) V(t) shows a devil's-staircase behaviour and

(b) chi(t) shifts to a higher value just before the "jumps" of V(t).

Asteroidal dynamics and the Kirkwood gaps

In collaboration with Harry Varvoglis (Thessaloniki) we apply the above ideas to the motion of asteroids near commensurabilities corresponding to Kirkwood gaps, in particular to the 2:1 gap.

If you have any questions, comments or inquires on the N-body simulation of galaxies project sent e-mail to Dr. Christos Vozikis at chriss@astro.auth.gr