\begin{document}$ \delta N $\end{document} formalism. By neglecting the exponential term's contribution to the curvaton potential, we calculate the power spectrum \begin{document}$ P_\zeta $\end{document} and the nonlinear non-Gaussian parameter \begin{document}$ f_{NL} $\end{document}. Our calculations analytically show that these two observables are independent of the inflaton potential. Finally, when the curvaton decays (and the inflaton field vanishes), the exponential potential approaches a constant value similar to that of the cosmological constant, which may play the role of dark energy."> The running curvaton -
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