Spatially-curved spacetimes in higher-dimensional Klein-Gordon-Rastall theory

In this paper, we analyze higher-dimensional gravitational Rastall theory coupled with a scalar field on spatially-curved spacetimes. Particularly, the theory admits baryotropic cosmic fluid and a massless quintessence scalar field whose scalar potential has the exponential form. In this setup, we obtain six critical points among which there is a scalar-field's kinetic dominated solution which describes both inflationary and late-time era related to the scalar potential parameter. In our model, we also show that the three parameters, namely the scalar potential parameter, the baryotropic parameter, and the Rastall parameter, become bifurcation parameters which determine the stability of the critical points.