2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/213693The primordial curvature fluctuation spectrum is reconstructed by the cosmic inversion method using the five-year WMAP data of the cosmic microwave background temperature anisotropy. We apply the covariance matrix analysis and decompose the reconstructed spectrum into statistically independent band-powers. The statistically significant deviation from a simple power-law spectrum suggested by the analysis of the first-year data is not found in the five-year data except possibly at one point near the border of the wavenumber domain where accurate reconstruction is possible.9pagesAstrophysicsGeneral Relativity and Quantum CosmologyHigh Energy Physics - Phenomenologytext