Computer Science
Scientific paper
Apr 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983natur.302..505g&link_type=abstract
Nature (ISSN 0028-0836), vol. 302, April 7, 1983, p. 505, 506; Reply, p. 506, 507.
Computer Science
10
Cosmology, Universe, Entropy, Phase Transformations, Space-Time Functions, Thermodynamic Equilibrium, Vacuum
Scientific paper
Counterarguments to the notion of a bouncing Universe are presented. It is shown that entropy considerations imply that a quantity derived within the framework of the Robertson-Walker Universe must decrease by a factor of about 10 to the 75th to allow the present Universe to bounce, while this quantity can in fact decrease by no more than a factor of about two. It is further shown that if the true vacuum state has zero energy density, then a Universe which is contracting in its low temperature phase can never complete a phase transition soon enough to cause a bounce. A reply to these arguments is presented which emphasizes that thermal equilibrium cannot be maintained during a universal phase change and that it is not clear that the temperature must have remained above the critical temperature. It is argued that a bounce is possible when various thermodynamic assumptions are changed.
Guth Alan H.
Sher Marc
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