Ontology type: schema:ScholarlyArticle
1982-01
AUTHORSLawrence S. Schulman, Philip E. Seiden
ABSTRACTThe stochastic star formation model of galactic evolution can be cast as a problem of directed percolation, the time dimension being that along which the directed bonds exist. We study various aspects of this percolation, those of general interest for the percolation phase transition and those of particular importance for the astrophysical application. Both analytical calculations and computer simulations are provided and the results compared. Among the properties are: value of the percolation threshold, critical indices, percolation probability (star density) near and away from the critical point, local density, cluster sizes, effects of rotation (for disk galaxy models) on the percolation threshold. Astrophysical consequences of some of these properties are discussed, in particular the way in which general phase transition behavior contributes to spiral arm morphology. We look at 1 (space) + 1 (time), 2 + 1 and “∞” + 1 dimensions, the 2 + 1 case being of interest for disk galaxies. More... »
PAGES83-118
http://scigraph.springernature.com/pub.10.1007/bf01011742
DOIhttp://dx.doi.org/10.1007/bf01011742
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