Cosmological models with variable constants

TL;DR

This paper investigates how fundamental constants like G, c, h, and Lambda vary over time within flat cosmological models that include bulk viscous fluids and matter creation mechanisms, focusing on radiation and matter-dominated scenarios.

Contribution

It introduces models where multiple fundamental constants vary simultaneously in a cosmological setting with viscous fluids and matter creation, expanding previous fixed-constant frameworks.

Findings

Constants G, c, h, and Lambda can vary over cosmic time in these models.

Different behaviors are observed in radiation and matter-dominated scenarios.

The models provide insights into the evolution of the universe with variable fundamental constants.

Abstract

The behavior of the constants, G,c,h,a,e,m and Lambda, considering them as variable, in the framework of a flat cosmological model with FRW symmetries described by a bulk viscous fluid and considering mechanisms of adiabatic matter creation are investigated. Within two models; one with radiation predominance and another of matter predominance, this behavior are studied.