CMB Constraints on a Stochastic Background of Primordial Magnetic Fields - Astrophysics > Cosmology and Nongalactic AstrophysicsReport as inadecuate




CMB Constraints on a Stochastic Background of Primordial Magnetic Fields - Astrophysics > Cosmology and Nongalactic Astrophysics - Download this document for free, or read online. Document in PDF available to download.

Abstract: We constrain a stochastic background of primordial magnetic field PMF byits contribution to the angular power spectrum of cosmic microwave backgroundanisotropies. We parametrize such stochastic background by a power-law spectrumwith index $n B$ and by its Gaussian smoothed amplitude $B \lambda$ on acomoving length $\lambda$. We give an approximation for the spectra of therelevant correlators of the energy-momentum of the stochastic background of PMFfor any $n B$. By using the WMAP 7 year data in combination with ACBAR, BICEPand QUAD we obtain the constraint $B {1 { m Mpc}} < 5.0$ nG at 95% confidencelevel for a stochastic background of non-helical PMF. We discuss the relativeimportance of the scalar and vector contribution to CMB anisotropies inobtaining these constraints. We then forecast {\sc Planck} capabilities inconstraining $B {1 { m Mpc}}$.



Author: Daniela Paoletti, Fabio Finelli

Source: https://arxiv.org/



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