Reply to “Comment on ‘Heavy element production in inhomogeneous big bang nucleosynthesis’”

Abstract

This is a reply report to [1]. We studied heavy element production in the high baryon density region in the early universe [3]. However it is claimed by [1] that a small scale but high baryon density region contradicts observations for the light element abundance or, in order not to contradict to the observations the high density region must be so small that it cannot affect the present heavy element abundance.In this paper we study big bang nucleosynthesis in the high baryon density region and show that in certain parameter spaces it is possible to produce enough amount of the heavy element without contradiction to cosmic microwave background and light element observations.

Constraint on Heavy Element Production in Inhomogeneous Big-Bang Nucleosynthesis from the Light Element Observations

“…However, their analysis is only limited to a parameter of a specific baryon number concentration. In this paper, we extend the investigations of Matsuura et al [1,31] to check the validity of their conclusion from a wide parameter space of the IBBN model.…”

Chemistry of heavy elements in the Dark Ages

“…This is similar to the scenario originally introduced by Jedamzik et al (1994) and later also discussed by Matsuura et al (2004Matsuura et al ( , 2005Matsuura et al ( , 2007. In the high density pocket the path to heavy elements is opened by an efficient triple-α reaction.…”

7Li Production in Inhomogeneous Big-Bang Nucleosynthesis

“…In our study, we adopt the two-zone model where the early universe has a high-and low-baryon density regions(e.g. [8,9]). Here we assume the baryon fluctuation is isothermal [4] The diffusion effect of nuclei is ignored because the time scale of diffusion is longer than that of the cosmic expansion [5].…”

“…In previous studies about IBBN, the synthesis of elements heavier than 7 Li such as Be and B have been investigated [7]. In recent studies, heavy elements, such as 56 Ni, 92 Mo, 96 Ru, can be synthesized in a high-density region [8]. On the other hand, it has been reported that the Li/H value can be lower than that of the SBBN [9].…”