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In the present paper, it is found that dark energy emerges spontaneously fromthe modified gravity. According to cosmological scenario, obtained here, theuniverse inflates for $\sim 10^{-37}$ sec. in the beginning and late universeaccelerates after 8.58 Gyrs. During the long intermediate period, itdecelerates driven by radiation and subsequently by matter. Emergedgravitational dark energy mimics quintessence and its density falls by 115orders from its initial value $2.58\times 10^{68} {\rm GeV}^4$ to its currentvalue $2.19\times 10^{-47} {\rm GeV}^4$ .Comment: 40 pages. To appearin Int. J. Mod. Phys.

COSMIC EVOLUTION WITH EARLY AND LATE ACCELERATION INSPIRED BY THE DUAL NATURE OF THE RICCI SCALAR CURVATURE