Alessandro Pesci

Gravity from the Entropy of Light is an interesting contribution to the new physics that asks the question: Is gravity fundamental? Sakharov and Stephen L. Adler already posed this question many years ago. Maybe now something will come out of it.

"    To speak of entropy per unit wavelength of black body radiation means to speak of entropy per 1-bit of- information thickness, since the single bits of information are carried by the single constituent photons in the space assigned by the quantum uncertainty. This suggests a deeper description of what we have discussed. Indeed, holography can be stated to mean that the allowed number of elementary bits of information in layers per unit bit of thickness, at given sum of the energy per bit and pressure, is limited (by an actual value). To the extent that concepts like bit of information, energy associated with a bit and pressure of a collection of bits can be regarded as primeval and, as such, meaningful even in absence of space, holography is pre-existing to space (cf. [16]). In this perspective, when space is introduced as the information on ‘where’ information is, the energy in the bit should spread to keep unchanged the elementary amount of information for the bit, and this would be quantum mechanics. When expressed in terms of this space of information, holography would then become the metric theory which describes gravity."

It from bit, Amen.