Comment on "Black Hole Entropy: A Closer Look"
Abstract
In a recent paper [Entropy 2020, 22(1), 17] C. Tsallis states that entropy  as in Shannon's or KullbackLeiber's definitions  is inadequate to interpret black hole entropy and suggests that a new nonadditive functional should take the role of entropy. Here we counter argue by explaining the important distinction between the properties of extensivity and additivity, the latter is fundamental for entropy while the former is a property of particular thermodynamical systems that is not expected on black holes. We also point out other debatable statements in his analysis of black hole entropy.
 Publication:

Entropy
 Pub Date:
 October 2020
 DOI:
 10.3390/e22101110
 arXiv:
 arXiv:2008.13744
 Bibcode:
 2020Entrp..22.1110P
 Keywords:

 General Relativity and Quantum Cosmology;
 Condensed Matter  Statistical Mechanics;
 Physics  Data Analysis;
 Statistics and Probability
 EPrint:
 Entropy 2020, 22(10), 1110