Fischler–Susskind holographic bound

The Fischler–Susskind holographic bound, first proposed by Willy Fischler and Leonard Susskind in 1998,^[1] is a holographic prescription based on the particle horizon, with Bousso's holographic bound being a generalization.^[2]

The Fischler–Susskind prescription is used to obtain the maximum number of degrees of freedom per Planck volume at the Planck era, compatible with the holographic principle.^[3]