Dynamical analysis and cosmological evolution in Weyl integrable gravity

TL;DR

This paper explores the cosmological evolution within Weyl integrable gravity, analyzing scalar field interactions, stability of solutions, and deriving exact solutions using variational symmetries in a universe with ideal and Chaplygin gases.

Contribution

It introduces a geometric scalar field in Weyl integrable gravity, analyzes its stability, and constructs exact solutions via variational symmetries, extending previous cosmological models.

Findings

Identification of stationary points and their stability properties.

Derivation of gravitational field equations from a Lagrangian.

Construction of analytic and exact solutions using variational symmetries.

Abstract

We investigate the cosmological evolution for the physical parameters in Weyl integrable gravity in a Friedmann--Lema\^{\i}tre--Robertson--Walker universe with zero spatially curvature. For the matter component, we assume that it is an ideal gas, and of the Chaplygin gas. From the Weyl integrable gravity a scalar field is introduced by a geometric approach which provides an interaction with the matter component. We calculate the stationary points for the field equations and we study their stability properties. Furthermore, we solve the inverse problem for the case of an ideal gas and prove that the gravitational field equations can follow from the variation of a Lagrangian function. Finally, variational symmetries are applied for the construction of analytic and exact solutions.