3 papers
gr-qc2025
Big-Bounce in Quantum f(R)-Cosmology: Polymer Dynamics with Internal Time
M. L. Limongi, S. Lo Franco, G. Montani +1
We construct the Hamiltonian formulation of the isotropic Universe in a generic metric f(R)-theory in the Jordan frame. We canonically quantize the Universe volume via a polymer fo…
gr-qc2025
Is the BKL map an intrinsic feature of the Quantum Mixmaster Universe?
S. Lo Franco, G. Montani
We study the quantum Mixmaster dynamics by constructing the corresponding Wheeler-DeWitt equation as a relativistic quantum theory in a pseudo-Riemannian Mini-superspace. The trans…
gr-qc2024
Running Einstein Constant and a Possible Vacuum State of the Universe
Giovanni Montani, Giulia Maniccia, Elisa Fazzari +1
We propose a revised formulation of General Relativity for cosmological settings, in which the Einstein constant varies with the energy density of the Universe. We demonstrate that…