On emergent gravity, ungravity and Λ

In this work we study the “ungravity” modifications to the Friedmann equations. The “ungravity” contributions are encoded in a modified entropy-area relation. To derive the modified Friedmann equations we use the first law of thermodynamics and the new entropy-area relationship. From the modified Friedmann equations (in the late time regime) we find an effective cosmological constant. Therefore, this simple model can provide an “ungravity” origin to the cosmological constant Λ.