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Maxwell's Demon

Shenker, Orly and Hemmo, Meir (2006) Maxwell's Demon. [Preprint]

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    Abstract

    "Maxwell's Demon", the famous thought experiment of James Clerk Maxwell, has been devised in 1867 as a counter example for the Second Law of thermodynamics. During the 140 years since the Demon was first suggested, numerous attempts have been made to counter Maxwell's argument. The attempts have been to show that Maxwell was wrong, since his Demon cannot work for one reason or another (see Leff and Rex 2003 for details and references). In this paper we show (following an argument by Albert 2000, Ch. 5.) that Maxwell was basically right, in the sense that his thought experiment is compatible with the laws of mechanics as well as with central principles of statistical mechanics. We then derive some (weak) restrictions on the Demon's efficiency. Finally, we prove that the Demon's cycle of operation can be completed (in particular, the Demon's memory can be erased) without increasing the total entropy of the universe. We draw some conclusions about the way to understand the meaning and role of probability in classical statistical mechanics


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    Item Type: Preprint
    Keywords: Maxwell, Demon, thermodynamics, statistical mechanics, entropy, information, memory, erasure, Bennett, Landauer
    Subjects: Specific Sciences > Probability/Statistics
    General Issues > Thought Experiments
    Specific Sciences > Physics > Classical Physics
    Specific Sciences > Computation/Information > Classical
    General Issues > Reductionism/Holism
    Specific Sciences > Physics
    Specific Sciences > Physics > Statistical Mechanics/Thermodynamics
    Depositing User: Dr Orly R. Shenker
    Date Deposited: 03 Jan 2008
    Last Modified: 07 Oct 2010 11:16
    Item ID: 3795
    URI: http://philsci-archive.pitt.edu/id/eprint/3795

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