Non-minimal Effective Scalar-Tensor Gravity in the Early Universe

TL;DR

This paper explores a non-minimal scalar-tensor gravity framework that supports early-Universe scenarios like bounce, inflation, and genesis, offering potential explanations for varying Hubble constant measurements.

Contribution

It demonstrates that the non-minimal scalar-tensor gravity theory can support multiple early-Universe phases and explain different Hubble constant values.

Findings

Supports bounce, inflation, and genesis in the theory.

Provides two different Hubble parameter values.

Potentially explains discrepancies in Hubble constant measurements.

Abstract

We study the consistency of several early-Universe scenarios within a framework of non-minimal effective sca\-lar--ten\-sor gravity. We show that bounce, inflation, and genesis stages are supported within the aforementioned theory. Consequently, this framework can serve as a viable model of the early Universe, where accelerated expansion is driven by the theory's own intrinsic degrees of freedom. Notably, the theory also provides two different values of the Hubble parameter, potentially explaining the different values of the Hubble constant measured from galaxy clusters and relic radiation, respectively.