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- Title
Small and Simple Systems That Favor the Arrow of Time.
- Authors
Chamberlin, Ralph V.
- Abstract
The 2nd law of thermodynamics yields an irreversible increase in entropy until thermal equilibrium is achieved. This irreversible increase is often assumed to require large and complex systems to emerge from the reversible microscopic laws of physics. We test this assumption using simulations and theory of a 1D ring of N Ising spins coupled to an explicit heat bath of N Einstein oscillators. The simplicity of this system allows the exact entropy to be calculated for the spins and the heat bath for any N , with dynamics that is readily altered from reversible to irreversible. We find thermal-equilibrium behavior in the thermodynamic limit, and in systems as small as N = 2 , but both results require microscopic dynamics that is intrinsically irreversible.
- Subjects
EINSTEIN, Albert, 1879-1955; PHYSICAL laws; THERMAL equilibrium; NONEQUILIBRIUM thermodynamics; SECOND law of thermodynamics; RING theory; ENTROPY
- Publication
Entropy, 2024, Vol 26, Issue 3, p190
- ISSN
1099-4300
- Publication type
Article
- DOI
10.3390/e26030190