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• W2896529609 endingPage "172" @default.
• W2896529609 startingPage "172" @default.
• W2896529609 abstract "We investigate the effect on the Big Bang Nucleosynthesis (BBN) from the presence of a stochastic primordial magnetic field (PMF) whose strength is spatially inhomogeneous. We assume a uniform total energy density and a gaussian distribution of field strength. In this case, domains of different temperatures exist in the BBN epoch due to variations in the local PMF. We show that in such case, the effective distribution function of particle velocities averaged over domains of different temperatures deviates from the Maxwell-Boltzmann distribution. This deviation is related to the scale invariant strength of the PMF energy density $rho_{rm Bc}$ and the fluctuation parameter $sigma_{rm B}$. We perform BBN network calculations taking into account the PMF strength distribution, and deduce the element abundances as functions of the baryon-to-photon ratio $eta$, $rho_{rm Bc}$, and $sigma_{rm B}$. We find that the fluctuations of the PMF reduces the $^7$Be production and enhances D production. We analyze the averaged thermonuclear reaction rates compared with those of a single temperature, and find that the averaged charged-particle reaction rates are very different. Finally, we constrain the parameters $rho_{rm Bc}$ and $sigma_{rm B}$ from observed abundances of $^4$He and D, and find that the $^7$Li abundance is significantly reduced. We also find that if the $eta$ value during BBN was larger than the present-day value due to a dissipation of the PMF or a radiative decay of exotic particles after BBN or if the stellar depletion of $^7$Li occurred, abundances of all light elements can be consistent with observational constraints." @default.
• W2896529609 created "2018-10-26" @default.
• W2896529609 creator A5014648014 @default.
• W2896529609 creator A5039864931 @default.
• W2896529609 creator A5057055868 @default.
• W2896529609 creator A5083397886 @default.
• W2896529609 date "2019-02-20" @default.
• W2896529609 modified "2023-10-17" @default.
• W2896529609 title "Big Bang Nucleosynthesis with an Inhomogeneous Primordial Magnetic Field Strength" @default.
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• W2896529609 doi "https://doi.org/10.3847/1538-4357/ab0088" @default.
• W2896529609 hasPublicationYear "2019" @default.
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