2026/03/31 by S. Lo Franco, G. Montani
Physics and Astronomy · #gr-qc
9 pages, 2 figures, 1 table
arxiv created 2026/08/04 · arxiv updated 2026/08/05
We present a rigorous description of the quantum dynamics of the closed isotropic Universe in the presence of an ekpyrotic-like scalar field, expressed in terms of relativistic quantum scatterings. Working in a covariant approach to the minisuperspace, we demonstrate the quantum equivalence between parametrizations in terms of the logarithmic scale factor and the volume variable. The analogy between the Wheeler-DeWitt equation and the Klein-Gordon equation, together with a proper definition of asymptotic states, allows us to construct a relativistic quantum-mechanical scattering framework. We describe the bouncing transitions a collapsing Universe undergoes when interacting with a Dirac delta potential, which represents the limit of an infinitely steep ekpyrotic potential. Two different transition channels can be distinguished depending on whether the relational time flow is preserved or not. We show that bouncing transitions cannot be neglected for highly delocalized states in coordinate space.