Boltzmann's time bomb

Abstract
Since the late nineteenth century, physics has been puzzled by the time-asymmetry of thermodynamic phenomena in the light of the apparent T-symmetry of the underlying laws of mechanics. However, a compelling solution to this puzzle has proved elusive. In part, I argue, this can be attributed to a failure to distinguish two conceptions of the problem. According to one, the main focus of our attention is a time-asymmetric lawlike generalisation. According to the other, it is a particular fact about the early universe. This paper aims (i) to distinguish these two different conceptions of the time-asymmetric explanandum in thermodynamics; (ii) to argue in favour of the latter; and (iii) to show that whichever we choose, our rational expectations about the thermodynamic behaviour of the future must depend on what we know about the past: contrary to the common view, statistical arguments alone do not give us good reason to expect that entropy will always continue to increase.
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Citations of this work BETA
Guido Bacciagaluppi (2007). Probability, Arrow of Time and Decoherence. Studies in History and Philosophy of Science Part B 38 (2):439-456.
Jill North (2010). An Empirical Approach to Symmetry and Probability. Studies in History and Philosophy of Science Part B 41 (1):27-40.
Roberto Torretti (2007). The Problem of Time's Arrow Historico-Critically Reexamined. Studies in History and Philosophy of Science Part B 38 (4):732-756.
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