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We study the role of an invariant infra-red cutoff in the late timecosmological dynamics. This low energy cutoff originates from the existence ofa minimal measurable uncertainty as a result of the curvature of backgroundmanifold, and can be encoded in an extended uncertainty relation. Inspired byblack hole entropy-area relation, we extend the analysis to the thermodynamicsof apparent horizon of the universe. By treating both the Newtonian and generalrelativistic cosmologies, we show that the contribution of infra-red cutoff inthe equations of dynamics can be interpreted as an effective fluid which iscapable of explaining late time cosmic speed up and even transition to aphantom phase of expansion. We use the latest observational data fromPLANCK2018 to constrain the parameter of an extended uncertainty relation.

The role of an invariant IR cutoff in late time cosmological dynamics