\begin{document}$n_s$\end{document}) and tensor-to-scalar power ratio (r) are independent of this coefficient. Consequently, the coefficients of this model are not constrained by Planck observations. Fortunately, the properties of preheating after inflation provide a viable approach to examining these coefficients. Through LATTICEEASY simulations, we trace the evolution of particle number density, scale factor, and energy density during the preheating process. Subsequently, we derive the parameters, such as the energy ratio (γ) and the e-folding number of preheating (\begin{document}$N_{\rm pre}$\end{document}), which facilitate further predictions of \begin{document}$n_s$\end{document} and r. We successfully validate real scalar inflation model using preheating in LATTICEEASY simulations based on the analytical relationship between preheating and inflation models."> Constraints on real scalar inflation from preheating using LATTICEEASY -
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