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The Gibbs paradox, Black hole entropy and the thermodynamics of isolated horizons

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arxiv 1209.2016 v3 pith:PXK45CCV submitted 2012-09-06 gr-qc

classification gr-qc
keywords isolatedblackclaimdescriptiondistinguishableentropygibbshole
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This letter presents a new, solely thermodynamical argument for considering the states of the quantum isolated horizon of a black hole as distinguishable. We claim that only if the states are distinguishable, the thermodynamic entropy is an extensive quantity and can be well-defined. To show this, we make a comparison with a classical ideal gas system whose statistical description makes only sense if an additional 1/N!-factor is included in the state counting in order to cure the Gibbs paradox. The case of the statistical description of a quantum isolated horizon is elaborated, to make the claim evident.

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  1. A note on entropy of matter in presence of gravity: status of extensivity of entropy

    gr-qc 2025-07 conditional novelty 4.0 of 10

    In a strong uniform Newtonian gravitational field, the entropy of a monoatomic ideal gas depends on the container's cross-sectional area and is extensive when particle number per unit area is fixed.

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