  We investigate observational constraints on inflationary parameters in the
context of an holographic cosmology with an induced gravity correction. We
consider two situations where a universe is firstly filled with a scalar field
and secondly with a tachyon field. Both cases are investigated in a slow-roll
regime. We adopt a quadratic potential and an exponential potential for the
scalar and the tachyon inflation respectively. In this regard, the standard
background and perturbative parameters characterizing the inflationary era are
modified by correction terms. We show a good agreement between theoretical
model parameters and Planck2018 observational data for both scalar and tachyon
fields.
