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Modified entropic gravity revisited

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Abstract

Inspired by Verlinde’s idea, some modified versions of entropic gravity have been suggested. Extending them in a unified formalism, herein we derive the generalized gravitational equations accordingly. From gravitational equations, the energy-momentum conservation law and cosmological equations are investigated. The covariant conservation law of energy-momentum tensor severely constrains viable modifications of entropic gravity. A discrepancy arises when two independent methods are applied to the homogeneous isotropic universe, posing a serious challenge to modified models of entropic gravity.

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Authors and Affiliations

  1. Department of Physics, East China Normal University, Shanghai, 200241, China

    Tower Wang

  2. Institute of Nuclear and Particle Physics, Astronomy and Cosmology, Shanghai Jiao Tong University, Shanghai, 200240, China

    Tower Wang

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  1. Tower Wang
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Correspondence to Tower Wang.

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Wang, T. Modified entropic gravity revisited. Sci. China Phys. Mech. Astron. 57, 1623–1629 (2014). https://doi.org/10.1007/s11433-014-5545-7

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  • DOI: https://doi.org/10.1007/s11433-014-5545-7

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