Other
Scientific paper
Mar 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...369..300h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 369, March 10, 1991, p. 300-307. Research supported by the Alfred P. Sloan
Other
3
Astronomical Models, Cosmic Rays, Galactic Clusters, Radiation Pressure, Gravitational Effects, Interstellar Matter, Milky Way Galaxy, Perturbation Theory, Radiative Transfer, Stellar Luminosity
Scientific paper
Under some circumstances the absorption of radiation momentum by an absorbing medium opens the possibility of a dynamical instability, sometimes called 'mock gravity'. Here, a simplified abstract model is studied in which the radiation source is assumed to remain spatially uniform, there is no reabsorption or reradiated light, and no forces other than radiative pressure act on the absorbing medium. It is shown that this model displays the unique feature of being not only unstable, but also self-organizing. The structure approaches a statistical dynamical steady state which is almost independent of initial conditions. In this saturated state the absorbers are concentrated in thin walls around empty bubbles; as the instability develops the big bubbles get bigger and the small ones get crushed and disappear. A linear analysis shows that to first order the thin walls are indeed stable structures. It is speculated that this instability may play a role in forming cosmic large-scale structure.
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