Astronomical Institute of the Czech Academy of Science, Czech Republic
Nonlinear interactions among oscillation modes of accretion tori
A formalism of nonlinear coupling of oscillation modes of fluid bodies
will be briefly explained and further applied to the oscillations of
pseudo-Newtonian slender tori. In particular, the attention is paid
to a nonlinear coupling among the epicyclic modes and to a role of
unstable modes in exciting the oscillations.