  The enormous red-shifting of the modes during the inflationary epoch suggests
that physics at the very high energy scales may modify the primordial
perturbation spectrum. Therefore, the measurements of the anisotropies in the
Cosmic Microwave Background (CMB) could provide us with clues to understanding
physics beyond the Planck scale. In this proceeding, we study the Planck scale
effects on the primordial spectrum in the power-law inflation using a model
which preserves local Lorentz invariance. While our model reproduces the
standard spectrum on small scales, it naturally predicts a suppression of power
on the large scales -- a feature that seems to be necessary to explain deficit
of power in the lower multipoles of the CMB.

High Energy Physics - Theory;Astrophysics;General Relativity and Quantum Cosmology