Comments on Verlinde's entropic gravity

Understand

Some comments are given on recently proposed entropic gravity by Verlinde.

• We focus on the derivation of Newton's law of gravitation.
• It is shown that consistent classical relations are enough to result in the Newtonian gravity.
• In our derivation, it is crucial that the entropy is a quarter of the number of states in units of the Boltzmann constant $k_ B$, and the number of states is given by the holographic principle.