What is entropy?

B.H. Lavenda, J. Dunning-Davies, M. Compiani

Research output: Contribution to journalArticle

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In the absence of experimental facts to support the study of the origins of the Universe and black holes, reliance must be shifted to theory, especially thermodynamics. To superstring theories, dealing with the unification of the four known forces during the evolution of the early Universe, and black holes, the end product of gravitational collapse, have been attributed rather peculiar thermodynamic properties such as lack of concavity, with the consequence of negative heat capacities, non-extensivity. It has been proposed that superadditivity rather than concavity constitutes the essence of the second law. Here we refute such claims and show that concavity determines the natural evolution of thermodynamic processes. © 1995 Società Italiana di Fisica.
Original languageEnglish
Pages (from-to)433 - 439
Number of pages7
JournalNuovo Cimento della Societa Italiana di Fisica B
Issue number4
Publication statusPublished - Apr 1995
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Lavenda, B. H., Dunning-Davies, J., & Compiani, M. (1995). What is entropy? Nuovo Cimento della Societa Italiana di Fisica B, 110(4), 433 - 439. https://doi.org/10.1007/BF02741453