Maxwell's zombie
Maxwell zombies (MZ) are a class of thermodynamic paradoxes closely related to the famous 19th-century thought experiment, Maxwell's demon (MD),[1][2] which tests the foundations of the second law of thermodynamics. MZs differ from MDs insofar as they are not prone to the same physical shortcomings that ultimately foil the demons.
The original Maxwell's demon is an imaginary creature that sorts gas molecules on an individual basis, creating a thermodynamic disequilibrium (either in pressure or temperature), whereby work can be performed on a perpetual basis, thereby subverting the second law. MDs fail for a number of reasons. First, the demon is microscopic in size like the molecules it sorts, hence is subject to the same kind of random thermal fluctuations, making it shaky and ineffective. Second, the MD would have difficulty 'seeing' the molecules it is trying to sort. Third, by thinking and doing the computations necessary to sort molecules, the MD generates sufficient disorder (entropy), when periodically clearing out its registers (i.e., forgetting), to satisfy the second law.
The Maxwell zombies sidestep these shortcoming. First, they are macroscopic in size, rather than microscopic, hence are not crippled by thermal fluctuations. Moreover, they operate on vast numbers of molecules simultaneously, rather than one at a time, therefore they are much more efficient. Second, they have no need to 'see' molecules; instead, they operate on them as they come along. Third, they do not perform computations. Thus, unlike Maxwell's demon, which is a small, intelligent, perceiving creature, Maxwell zombies are big, dumb, and blind devices.
More than two dozen Maxwell zombies have appeared in mainstream scientific literature and international conferences.[3][4][5][6] Many remain unresolved in favor of the second law. The most theoretically grounded and experimentally verified of these is Duncan's paradox.[7][8]
See also[edit]
References[edit]
- ↑ Leff, Harvey S. and Andrew F. Rex, ed. Maxwell's Demon: Entropy, Information, Computing. (Bristol: Adam-Hilger, 1990) ISBN 0-7503-0057-4 Search this book on
..
- ↑ Leff, Harvey S. and Andrew F. Rex, ed. Maxwell's Demon 2: Entropy, Classical and Quantum Information, Computing. (CRC Press, 2002) ISBN 0-7503-0759-5 Search this book on ..
- ↑ Čápek, V. and D.P. Sheehan, Challenges to the Second Law of Thermodynamics (Theory and Experiment); Vol. 146 in Fundamental Theories of Physics Series, (Springer, Dordrecht, Netherlands, 2005) ISBN 1-4020-3015-0 Search this book on ..
- ↑ First International Conference on Quantum Limits to
the Second Law, San Diego, CA, July 2002, AIP Conference
Volume 643; Sheehan, D.P., ed. (American Institute of
Physics, Melville, NY, 2002) ISBN 0-7354-0098-9 Search this book on ..
- ↑ The Second Law of Thermodynamics: Foundations and Status, Special Issue of Foundations of Physics, (Vol. 37.12); Proceedings of AAAS Symposium, June 19–22, 2006, University of San Diego, CA (2007).
- ↑ Second Law of Thermodynamics: Status and Challenges, Proceedings of symposium at 92nd Annual Meeting of Pacific Division of AAAS, 14–15 June 2011, University of San Diego; AIP Conference Volume 1411; Sheehan, D.P., ed. (American Institute of Physics, Melville, NY, 2011) ISBN 978-0-7354-0985-9 Search this book on ..
- ↑ T.L Duncan, Phys. Rev. E 61 4661 (2000).
- ↑ D.P. Sheehan, D.J. Mallin, J.T. Garamella, and W.F. Sheehan, Found. Phys. 44 235 (2014).
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