RT Journal Article T1 Concept and solution of digital twin based on a Stieltjes differential equation A1 Area Carracedo, Iván Carlos A1 Fernández Fernández, Francisco Javier A1 Nieto, Juan J. A1 Fernández Tojo, Fernando Adrián K1 1206.02 Ecuaciones Diferenciales K1 1206.12 Ecuaciones Diferenciales Ordinarias K1 2420.08 Virus Respiratorios AB We introduce the concept of a digital twin by using Stieltjes differential equations. A precise mathematical definition of solution to the problem is presented. We also analyze the existence and uniqueness of solutions, introduce the concept of main digital twin. As a particular case, the classical compartmental SIR (susceptible, infected, recovered) epidemic model is considered and we study the interrelation between the digital twin and the system. In doing so, we use Stieltjes derivatives to feed the data from the real system to the virtual model which, in return, improves it in real time. Numerical simulations with real data of the COVID-19 epidemic show the accuracy of the proposed ideas. PB Mathematical Methods in the Applied Sciences SN 01704214 YR 2022 FD 2022-08 LK http://hdl.handle.net/11093/3350 UL http://hdl.handle.net/11093/3350 LA eng NO Mathematical Methods in the Applied Sciences, 45(12): 7451-7465 (2022) NO Financiado para publicación en acceso aberto: Universidade de Vigo/CISUG NO Xunta de Galicia | Ref. ED431C 2019/02 DS Investigo RD 04-dic-2024