Transport Equation for Small Systems and Nonadditive Entropy Megías Fernández, Eugenio Transport equation Nonextensive statistics Phase space A.D. is supported by the Project Instituto Nacional de Ciencia e Tecnologia-Fisica Nuclear Aplicada INCT-FNA) Proc. No. 464898/2014-5, by the Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq-Brazil), Grant 304244/2018-0, by Project INCT-FNA Proc. No. 464 898/20145, and by FAPESP, Brazil, Grant 2016/17612-7. The work of E.M. is supported by the project PID2020114767GB-I00 financed by MCIN/AEI/10.13039/501100011033, by the FEDER/Junta de AndaluciaConsejeria de Economia y Conocimiento 2014-2020 Operational Program under Grant A-FQM178UGR18, by Junta de Andalucia under Grant FQM-225, and by the Consejeria de Conocimiento, Investigacion y Universidad of the Junta de Andalucia and European Regional Development Fund (ERDF) under Grant SOMM17/6105/UGR. The research of E.M. is also supported by the Ramon y Cajal Program of the Spanish MCIN under Grant RYC-2016-20678. J.A.S.L. is partially supported by CNPq (310038/2019-7), CAPES (88881.068485/2014), and FAPESP (LLAMA Project No. 11/51676-9). The nonadditive entropy introduced by Tsallis in 1988 has been used in different fields and generalizes the Boltzmann entropy, extending the possibilities of the application of the statistical methods developed in the context of Mechanics. Here, we investigate one of the last points of the theory that is still under discussion: the source term of the nonextensive transport equation. Based on a simple system, we show that the nonadditivity is a direct consequence of the phase space topology and derive the source term that leads to the nonextensive transport equation. 2022-06-15T06:42:44Z 2022-06-15T06:42:44Z 2022-05-10 journal article Megías, E.; Lima, J.A.S.; Deppman, A. Transport Equation for Small Systems and Nonadditive Entropy. Mathematics 2022, 10, 1625. [https://doi.org/10.3390/math10101625] http://hdl.handle.net/10481/75490 10.3390/math10101625 eng http://creativecommons.org/licenses/by/3.0/es/ open access Atribución 3.0 España MDPI