Impact of Particle Creation in Rastall Gravity

Abstract

We investigated the Friedmann–Lemaitre–Robertson–Walker (FLRW) cosmological models within the framework of Rastall gravity incorporating particle creation. The modified field equations for Rastall gravity are derived, and exact solutions are obtained under various types of scale factors. The qualitative behaviour of our solutions depends on the Rastall coupling parameter ψ=kλ. Following the literature, we have restricted the Rastall coupling parameter ψ(k=1) to the range −0.0001ψ0.0007 at 68% CL from CMB+BAO data. Furthermore, we have discussed the distinct physical behaviour of the derived models in detail.

Keywords

• FLRW metric
• Rastall gravity
• particle creation