Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...203.9111v&link_type=abstract
American Astronomical Society Meeting 203, #91.11; Bulletin of the American Astronomical Society, Vol. 35, p.1354
Astronomy and Astrophysics
Astronomy
Scientific paper
We present evidence that collisionless simulations of galaxy formation can lead to substantial amounts of chaos, and that this chaos can play an important role in driving the galaxy towards a `well-mixed' state. Earlier numerical integrations of orbits in fixed potentials had shown (Kandrup, Vass, & Sideris, MNRAS 341, 927-936, 2003) that a period of time-dependence with a strong, possibly damped, oscillatory component can trigger large amounts of transient chaos, and it had been argued that resonant phase mixing associated with this transient chaos could play a major role in accounting for the speed and efficiency in violent relaxation. Simulations described here corroborate this physical expectation, thereby reinforcing the idea that violent relaxation can be interpreted as a collective process driven (e.g., Terzi{\' c} & Kandrup, MNRAS, in press, 2003) by resonances between the frequencies of bulk oscillations and the natural frequencies of individual orbits.
Kandrup Henry E.
Terzi{'c} B.
Vass Ileana M.
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