Proliferation of large spatial dimensions is expected to increasethe entropy content of a physical system which is characterized bya given amount of energy.
Evidently the more the dimensions, themore ways there are to split up a given amount of energy between the quantum states of the system.
Thus, one may expect the challenge to the holographic entropy bound to become more and more serious as the number of spatial dimensions increases.
As an example, consider in D flat spatial dimensions a spherical box of radius R which contains massless fields. We shall follow the analysis of in order to calculate the system’s entropy in the thermodynamic regime.
The mean thermal energy in the sphere from one helicity degree
of freedom is