Other
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983crasb.296...71b&link_type=abstract
Academie des Sciences (Paris), Comptes Rendus, Serie II Mecanique, Physique, Chimie, Sciences de l'Univers, Sciences de la Terre
Other
1
Galactic Structure, Spiral Galaxies, Broken Symmetry, Disks (Shapes), Dissipation, Interstellar Gas, Nonlinear Systems, Stellar Evolution
Scientific paper
The spatial and temporal structures of spiral galaxies are attributed to a tendency for auto-organization, which is linked to the nonlinear kinetics of material transformation. A theory of dissipative structures proposed by Glansdorff and Prigogine (1971) and Nicolis and Prigogine (1977) is explored. Criteria for satisfying the theory of dissipative structures include an openess to the rest of the universe, a macroscopic state of equilibrium, and inclusion of an autocatalytic autoreinforcement at specific steps in the chain of events of the process. The latter step can be replaced by a process of autoamplification, which induces a nonlinear behavior and allows instabilities to arise in a steady regime, thus extending the equilibrium state. In a spiral galaxy, the dissipative, irreversible processes can lead to the diverse synthesis of molecules by a catalysis of dusts in a gaseous phase. Stars form because of the cooling and collapse of clouds, with the material eventually ending as white dwarfs, neutron stars, and other end products. Dissipative structures in galaxies follow a Boltzmann distribution, with clumps of stars forming in regions of dense gas concentrations.
Bodifee G.
de Loore Camiel
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