https://amu.hal.science/hal-02437160Philippe, GuillemantGuillemantPhilippeIUSTI - Institut universitaire des systèmes thermiques industriels - AMU - Aix Marseille Université - CNRS - Centre National de la Recherche ScientifiqueMarc, MedaleMedaleMarcIUSTI - Institut universitaire des systèmes thermiques industriels - AMU - Aix Marseille Université - CNRS - Centre National de la Recherche ScientifiqueA unique but flexible space–time could challenge multiverse theoriesHAL CCSD2019Brownian Diffusion timeSpace–timeMultiverse Block universeData-mining[PHYS.PHYS.PHYS-COMP-PH] Physics [physics]/Physics [physics]/Computational Physics [physics.comp-ph]MEDALE, Marc2020-01-13 15:44:152023-03-24 14:53:142020-01-13 16:11:57enJournal articleshttps://amu.hal.science/hal-02437160/document10.1016/j.aop.2019.05.005application/pdf1In a previous paper (Guillemant et al., 2018), we have shown using a 2D billiard toy model that the propagation of uncertainties resulting from space–time discretization leads to a classicalmultiverse. In this one we estimate the growing law of the number of its branches, thanks to an original shock indexation method that permits a very fast comparison of trajectories. For different involved parameters we use random sets of infinitesimally perturbed initial conditions. From each set, we compute a collection up to hundred millions of different billiard histories. Our main result is the calculation of a Brownian saturation time when the number of branches begins to exceed the total number of billiard states. We discuss the possibility suggested by this result to change locally the paths of objects without changing their past and future histories and then subverting their global system. We conclude that a unique but flexible space–time could compete with the current many-worlds interpretation claiming that each branch is a different universe.