Second-order calculation of entropy changes induced by spiral density waves in galaxies

Details Second-order calculation of entropy changes induced by spiral density waves in galaxies Second-order calculation of entropy changes induced by spiral density waves in galaxies

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...149..321f&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 149, no. 2, Aug. 1985, p. 321, 322.

Astronomy and Astrophysics

Astrophysics

Density Wave Model, Entropy, Galactic Structure, Spiral Galaxies, Boltzmann Transport Equation, Gravitation Theory, Partial Differential Equations, Perturbation Theory

Scientific paper

A second-order calculation of the entropy changes induced by growing spiral density waves in the disks of normal spiral galaxies is presented which avoids difficulties of a previous study with the conservation of the overall entropy of the galaxies. It is shown that the appearance of spiral structure is accompanied by a net entropy flux out of the regions of spiral structure towards the resonances as expected for any physical system evolving into a more ordered state.

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