Loop quantum gravity is one of the leading candidate theory to
non-perturbatively quantize gravity. In this framework, holonomy corrections to
the equation of propagation of gravitons in a FLRW background have been
derived. We investigate the consequences of those corrections on the tensor
power spectrum in de-Sitter and slow-roll inflations, for n=-1/2. Depending on
the value of the Barbero-Immirzi parameter, several observational features
could be expected.Comment: 5 pages, Proc. of the 43rd Rencontres de Moriond "Cosmology 2008