Observational constrained $F(R,\mathcal{G})$ gravity cosmological model and the dynamical system analysis

In this paper, we have analyzed the geometrical and dynamical parameters of $\mathcal{F}(R,\mathcal{G})=\alpha R^2{\mathcal{G}}^{\beta }$ cosmological model, ($R$, $\mathcal{G}$ being the Ricci scalar and Gauss-Bonnet invariant respectively), constraining the parameters through the cosmological data sets. It is exhibited that the model admits a viable radiation era, and early deceleration followed by late-time acceleration in the matter-dominated era. From the phase-space, portrait stability criterion has been analysed, restricting the parameter $\beta$, different from $\beta =-1$. Additionally, we have explored the stability of the model from the behavior of critical points and obtained the present value of the density parameter for matter-dominated and dark energy components, which are identical to those obtained through cosmological data sets.