Ciclo di Seminari - Progetto ERC grant PASCAL (Probabilistic and Statistical Techniques for Cosmological Applications) Mercoledì 18 Marzo - ore 14.30 Aula D'Antoni 1101 Dipartimento di Matematica Università di Roma Tor Vergata Speaker: Mirko D'Ovidio - Università di Roma La Sapienza Title: Coordinates change and random fields Abstract:The time change of one parameter processes is a powerful tool well investigated so far. We present in this talk some theoretical aspects concerning the coordinates change of multiparameter processes and some applications to the analysis of the cosmic microwave background radiation. We consider fractional powers of positive definite operators such as the (time) fractional derivative or the fractional Laplacean. Cordiali saluti Claudio Durastanti