Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2009-03-11
JCAP07(2009)041
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
v2: change in analysis method and confidence interval improved v3: typos corrected v4: a typo in Eq. 36 corrected v5: lower bo
Scientific paper
10.1088/1475-7516/2009/07/041
In the presence of the primordial magnetic field, initial vector (vorticity) perturbations produce cosmological Alfven waves and leave imprints on cosmic microwave background (CMB) temperature and polarization anisotropy. We have investigated imprints of cosmological Alfven waves in CMB anisotropy. For data constraints, 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 3 sigma limit from our analysis and the Alfven velocity limit from the total energy density constraint, we impose a lower bound on the amplitude of primordial vector perturbation: 4*10^-12 at k_0=0.002/Mpc.
Kim Jaiseung
Naselsky Pavel
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