Holographic principle in spacetimes with extra spatial dimensions

F. Scardigli and R. Casadio have considered uncertainty principles which take into account the role of gravity and possible existence of extra spatial dimensions. They have argued that the predicted number of degrees of freedom enclosed in a given spatial volume matches the holographic counting only for one of the available generalization and without extra dimensions. Taking into account the additional inevitable source of uncertainty in distance measurement, which is missed in their approach, we show that the holographic properties of the proposed uncertainty principle is recovered in the models with extra spatial dimensions.