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Magnetic reheating
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DOI：10.1093/mnrasl/slx195.png)
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摘要
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We provide a new bound on the amplitude of primordial magnetic fields (PMFs) by using a novel mechanism, magnetic reheating. The damping of the magnetohydrodynamics fluid motions in a primordial plasma brings the dissipation of the PMFs. In the early Universe with z greater than or similar to 2 x 10(6), cosmic microwave background (CMB) photons are quickly thermalized with the dissipated energy and shift to a different Planck distribution with a new temperature. In other words, the PMF dissipation changes the baryon-to-photon number ratio, and we name such a process magnetic reheating. From the current baryon-to-photon number ratio obtained from the big bang nucleosynthesis and CMB observations, we put the strongest constraint on the PMFs on small scales which CMB observations cannot access, B-0 less than or similar to 1.0 mu G at the scales 10(4) < k < 10(8) h Mpc(-1). Moreover, when the PMF spectrum is given in a blue power-law type, the magnetic reheating puts a quite strong constraint, for example, B-0 less than or similar to 10(-17), 10(-23), and 10(-29) nG at 1 comoving Mpc for n(B) = 1.0, 2.0, and 3.0, respectively. This constraint would give an impact on generation mechanisms of PMFs in the early Universe.
Keyword:
cosmic background radiation
early Universe
cosmology: theory
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IF:
4.8
论文数:
7.0W
被引数:
25.0W
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