Time Variable Cosmological Constant from Renormalization Group Equations

TL;DR

This paper investigates a time-varying cosmological constant derived from renormalization group equations, analyzing its implications for cosmic evolution and testing its consistency with observational data.

Contribution

It introduces a novel model of a dynamic cosmological constant based on RGEs and evaluates its compatibility with current cosmological observations.

Findings

Model is consistent with cosmic data

Supports viability as a dark energy candidate

Provides new insights into time-variable CC dynamics

Abstract

In this paper, a time variable cosmological constant (CC) from renormalization group equations (RGEs) is explored, where the renormalization scale $\mu^2=R^{-2}_{CC}=Max(\dot{H}+2H^2,-\dot{H})$ is taken. The cosmological parameters, such as dimensionless energy density, deceleration parameter and effective equation of state of CC etc, are derived. Also, the cosmic observational constraints are implemented to test the model's consistence. The results show that it is compatible with cosmic data. So, it would be a viable dark energy model.