Szabolcs Osváth
CEO, Kinepict Ltd, Budapest, Hungary
Associate Professor, Semmelweis University, Budapest, Hungary

This paper explains thermodynamic irreversibility by applying the expansion of the Universe to thermodynamic systems. The effect of metric expansion is immeasurably small on shorter scales than intergalactic distances. Multiparticle systems, however, are chaotic, and amplify any small disturbance exponentially. Metric expansion gives rise to time asymmetric behavior in thermodynamic systems in a short time (few nanoseconds in air, few ten picoseconds in water). In contrast to existing publications, this paper explains without any additional assumptions the rise of thermodynamic irreversibility from the underlying reversible mechanics of particles. Calculations for the special case which assumes FLRW metric, slow motions (v ≪ c) and approximates space locally by Euclidean space show that metric expansion causes entropy increase in isolated systems. The rise of timeasymmetry, however, is not affected by these assumptions. Any influence of the expansion of the Universe on the local metric causes a coupling between local mechanics and evolution of the Universe. Ilya Prigogine believed that the second law of thermodynamics had a dynamical origin. He argued that the microscopic dynamics is inherently irreversible. This paper gives a possible explanation of the origin of the microscopic irreversibility assumed by Prigogine. The evolution of thermodynamic systems is thus visibly coupled to the evolution of the Universe in a very short time. In this sense, the cosmological ‘‘arrow of time’’ can be considered a ‘‘master arrow of time’’, which implies the ‘‘thermodynamic arrow of time’’.
Osváth S (2018) Physica A 491, 764 770, Is thermodynamic irreversibility a consequence of the expansion of the Universe?
Osváth S (20016) viXra, Is thermodynamic irreversibility a consequence of the expansion of the Universe? 