Physics
Scientific paper
Jun 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976phla...57..305s&link_type=abstract
Physics Letters A, Volume 57, Issue 4, p. 305-306.
Physics
1
Scientific paper
The Kac ring model is used to show how two time boundary conditions lead to apparently normal causal behavior in the initial stages of a system's development and to reversed causality near the end. In this model small subsystems for which a nonequilibrium state is specified at some intermediate time will relax away from that time regardless of the behavior of the rest of the system. This feature casts doubt on the possibility of learning of a future contraction of the universe through laboratory experiments on long lived nuclei.
I wish to thank my colleagues at the Technion for many useful and stimulating discussions.
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