An emergent cosmological model from running Newton constant
arxiv(2024)
Abstract
We propose an emergent cosmological model rooted in the Asymptotically Safe
antiscreening behavior of the Newton constant at Planckian energies.
Distinguishing itself from prior approaches, our model encapsulates the
variable nature of G through a multiplicative coupling within the matter
Lagrangian, characterized by a conserved energy-momentum tensor. The universe
emerges from a quasi-de Sitter phase, transitioning to standard cosmological
evolution post-Planck Era. Our analysis demonstrates the feasibility of
constraining the transition scale to nearly classical cosmology using Cosmic
Microwave Background (CMB) data and the potential to empirically probe the
antiscreening trait of Newton's constant, as predicted by Asymptotic Safety.
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