Physics
Scientific paper
May 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976pthph..55.1419i&link_type=abstract
Progress of Theoretical Physics, Vol. 55, No. 5, pp. 1419-1431
Physics
11
Scientific paper
Nonlinear modulation of density wave in self-gravitating systems is studied by the reductive perturbation method. Using gas dynamical equations, an infinitely long rotating cylinder and an infinitesimally thin disk are considered. In the former system, both one-dimensional and two-dimensional modulations, the so-called self-focusing, are found to be stable for all wave number when the carrier wave propagates perpendicularly to rotational axis. In the latter system, amplitude modulation becomes unstable for large wave number. This unstable amplitude modulation grows to the envelope solitary wave in a time of the order of rotational one even if the amplitude of carrier wave is as low as one hundredth of zeroth order quantity. It is concluded that nonlinear effects cannot be neglected in the density wave theory of spiral arms. The conjecture is proposed that this nonlinear modulationally unstable mode can be identified with the spiral arms of S-type galaxies.
Ikeuchi Satoru
Nakamura Takashi
No associations
LandOfFree
Nonlinear Modulation of Density Wave in Self-Gravitating Systems ---Gas Dynamical Description--- does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Nonlinear Modulation of Density Wave in Self-Gravitating Systems ---Gas Dynamical Description---, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Nonlinear Modulation of Density Wave in Self-Gravitating Systems ---Gas Dynamical Description--- will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1797878