Optical conductivity in the Mott-Hubbard insulator ${\mathrm{V}}_2$${\mathrm{O}}_3$

I evaluate the optical conductivity of the single-band Hubbard model in three dimensions. The calculation is carried out in the insulating Mott phase by means of the slave-boson technique. The main aim of the present work is to numerically extend previous analytical work in order to make a comparison with results of recent optical measurements performed on ${\mathrm{V}}_2$${\mathrm{O}}_3$.