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In the presence of the primordial magnetic field, initial vector (vorticity)perturbations produce cosmological Alfven waves and leave imprints on cosmicmicrowave background (CMB) temperature and polarization anisotropy. We haveinvestigated imprints of cosmological Alfven waves in CMB anisotropy. For dataconstraints, we have used the power spectrum of the recent CMB observations,and correlations estimated from WMAP Internal Linear Combination (ILC) maps.Our analysis shows 3 sigma evidence of cosmological Alfven waves. Using the 3sigma limit from our analysis and the Alfven velocity limit from the totalenergy density constraint, we impose a lower bound on the amplitude ofprimordial vector perturbation: 4*10^-12 at k_0=0.002/Mpc.

Cosmological Alfv\'en waves in the recent CMB data, and the observational bound on the primordial vector perturbation