Noether gauge symmetry approach in Gauss–Bonnet dilatonic theory of gravity

Abstract

The approach of Noether symmetries with gauge term in the Gauss–Bonnet dilatonic theory of gravity is used for different values of the state parameter, ω, of the background matter. It is found that for ω = –1 (dark energy Universe), ω = 0 (matter-dominated Universe), and ω = 1 (the case of stiff matter), for the existence of Noether gauge symmetries, the potential V([Formula: see text]) and the coupling of the Gauss–Bonnet term with gravity Λ([Formula: see text]) are obtained as exponential functions of the scalar field [Formula: see text]. For the case of arbitrary ω the coupling parameter Λ([Formula: see text]) is found as a linear function of the scalar field [Formula: see text] and the potential is a constant, for the existence of Noether gauge symmetries. Here it is observed that both the potential and coupling parameter depend on the evolutionary history of the Universe.