“…All the models we have elsewhere discussed (Cataldo, 2016a(Cataldo, , 2016b(Cataldo, , 2017a(Cataldo, , 2017b(Cataldo, , 2017c(Cataldo, , 2017d) start from hypothesizing a closed Universe, homogeneous and isotropic, belonging to the so-called oscillatory class (O 1 type in the Harrison classification) (Harrison, 1967). More precisely, we postulate a Universe that approximately evolves following a simple-harmonic motion, whose pulsation is equal to the ratio between the speed of light and the value of the mean radius, taken as reference (Cataldo, 2017b(Cataldo, , 2017c.…”