2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/218466This is a short analysis of the changes in the concept of entropy as applied to physics of the present-day and Early Universe. Of special interest is a leading role of such a notion as deformation of a physical theory. The relation to a symmetry of the corresponding theory is noted. As this work is not a survey, the relevant author's works are mainly considered. This paper is to be published in special issue "Symmetry and Entropy" of journal SYMMETRY: Culture and Science23 pages. to be published in special issue "Symmetry and Entropy" of journal SYMMETRY: Culture and ScienceHigh Energy Physics - Theorytext