Abstract: The distinction between chaotic and regular behavior of orbits in galactic models is an important issue and can help our understanding of galactic dynamical evolution. In this talk, we deal with this issue by applying the techniques of the Smaller (and Generalized) ALingment Indices, SALI (and GALI), to extensive samples of orbits in a barred galaxy potential. We estimate the fraction of chaotic and regular orbits for different sets of initial conditions and we vary the model parameters, like the mass, size and pattern speed of the bar. We also combine the GALI method with new ways of interpreting Fourier spectra to distinguish strong chaotic motion from weak chaotic and regular and then classify chaotic trajectories with different rates of orbital diffusion in configuration space. Finally, we present some preliminary results showing velocity distribution diagrams, which can be useful in identifying regular and chaotic motion in real observational data. Reference: Manos T. and Athanassoula E., Mon. Not. R. Astron. Soc., Vol. 415, 629, 2011.
Seminarsko predavanje bo v torek 22. novembra 2011 ob 15:15 uri v seminarski sobi CAMTP, Krekova 2, pritličje desno. Vljudno vabljeni vsi zainteresirani, tudi študentje.