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- W2010763777 abstract "We constrain a stochastic background of primordial magnetic field (PMF) by its contribution to the angular power spectrum of cosmic microwave background anisotropies. We parametrize such stochastic background by a power-law spectrum with index $n_B$ and by its Gaussian smoothed amplitude $B_lambda$ on a comoving length $lambda$. We give an approximation for the spectra of the relevant correlators of the energy-momentum of the stochastic background of PMF for any $n_B$. By using the WMAP 7 year data in combination with ACBAR, BICEP and QUAD we obtain the constraint $B_{1 {rm Mpc}} < 5.0$ nG at 95% confidence level for a stochastic background of non-helical PMF. We discuss the relative importance of the scalar and vector contribution to CMB anisotropies in obtaining these constraints. We then forecast {sc Planck} capabilities in constraining $B_{1 {rm Mpc}}$." @default.
- W2010763777 created "2016-06-24" @default.
- W2010763777 creator A5014626397 @default.
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- W2010763777 date "2011-06-29" @default.
- W2010763777 modified "2023-09-23" @default.
- W2010763777 title "CMB constraints on a stochastic background of primordial magnetic fields" @default.
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- W2010763777 doi "https://doi.org/10.1103/physrevd.83.123533" @default.
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