Undecidability, entropy and information loss in computations of classical physical systems

Details Undecidability, entropy and information loss in computations of classical physical systems Undecidability, entropy and information loss in computations of classical physical systems

2008-03-12

arxiv.org/abs/0803.1694v1

Physics

Condensed Matter

Statistical Mechanics

1 figure

Scientific paper

We investigate how undecidability enters into computations of classical physical systems and contributes to the increase of entropy and loss of information. In actual computation with finite bit of information capacity we accept inconsistency to avoid undecidability, which in turn affects entropy of the system. We apply the Shannon entropy to the discretized Liouvillian system. It is shown that for any finite bit of information capacity information is always lost or the entropy always increases for the probability density following Hamiltonian dynamics, both in time forward and time backward direction, thus showing information theoretical version of second law of thermodynamics. This is due to the finiteness of information capacity and incompressibility of probability distribution in Liouville's equation.

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