Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.181..405l&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 181, Nov. 1977, p. 405-419.
Astronomy and Astrophysics
Astrophysics
82
Astrophysics, Specific Heat, Stellar Gravitation, Stellar Mass Ejection, Astronomical Models, Self Consistent Fields, Star Clusters, Thermodynamic Equilibrium
Scientific paper
Conditions under which self-gravitating systems naturally have negative specific heats are outlined, and an exactly calculable self-gravitating model is presented. The reasons why a system in stable thermodynamic equilibrium cannot have a negative specific heat if it is either extensive or in contact with a heat bath are reviewed. It is shown that large-scale attractive forces cause negative specific heats in a microcanonical ensemble and a giant phase transition in a canonical ensemble. The question of whether all normal phase transitions may not be generated by negative-specific-heat elements at a microscopic level is investigated by considering a simple model of a chemical dissociation. The microscopic negative-specific-heat elements that cause the transition are isolated.
Lynden-Bell Donald
Lynden-Bell R. M.
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