Quark-Hadron Phase Transition and Nucleosynthesis in Early Universe

早期宇宙中的夸克-强子相变和核合成

• 批准号: 01540308
• 负责人: SATO Katsuhiko
• 金额: $ 1.34万
• 依托单位: University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01540308/
• 关键词: Cosmology; Nucleosynthesis; Early Universe; 軽元素; 宇宙論; クオ-ク・ハドロン相転移

From recent studies of nucleosynthesis in inhomogeneous universe, it has been pointed out that 1) OMEGA_B=1model becomes consistent with light element observations, 2) heavy elements including r-process elements are abundantly synthesized, and 3) ^9Be plays a role of the indicator of inhomogeneity since ^9Be is also abundantly synthesized. These suggestions were, however, based on a simple two-zone model in which back diffusion of neutrons are neglected during the nucleosynthesis. In the present investigation, it was shown that 1) the upper limit of OMEGA_B which is consistent with light element observations is almost the same as that of homogeneous case, OMEGA_B=0.06h^<-2>,2) the ^9Be abundance in the simple two-zone model is overestimated at least two orders of magnitude in plausible parameter space and 3) the abundances of CNO elements are very small in the proper range of baryon/photon ratio consistent with the abundances of light elements.

从最近对非均匀宇宙核合成的研究中指出，1)omega_B=1模型与轻元素观测结果一致，2)包括r过程元素在内的重元素被大量合成，3)^9Be也被大量合成，起到了不均匀指示剂的作用。然而，这些建议是基于一个简单的双区模型，在该模型中，在核合成过程中忽略了中子的后扩散。本文的研究表明：1)与轻元素观测一致的omega_B的上限与均匀情况下的omega_B几乎相同，omega_B=0.06h^~(-2)~(-2)；(2)在合理的参数空间中，简单双区模型中的^9Be丰度被高估了至少两个数量级；

项目成果

N.Terasawa,K.Sato: "Neutron diffusion and nucleosynthesis in the inhomogeneous universe" Prog.Theor.Phys.81. 254-258 (1989)

N.Terasawa、K.Sato：“非均匀宇宙中的中子扩散和核合成”Prog.Theor.Phys.81。

N.Terasawa,K.Sato: "Nucleosynthesis in the inhomogeneous Universe and effects of neutron diffusion" Prog.Theor.Phys.81. 1085-1090 (1989)

N.Terasawa、K.Sato：“不均匀宇宙中的核合成和中子扩散的影响”Prog.Theor.Phys.81。

N.Terasawa,K.Sato: "Neutron Ditlnsion and Nucleo Stnthesis in the Llniverse with Isothermal flnctnation" Phys Rev.D39. 2893-2900 (1989)

N.Terasawa、K.Sato：“等温宇宙中的中子扩散和核合成”Phys Rev.D39。

N.Terasawa,K.Sato: "Nucleostn thesis in the Inhomogeneous Llniverse and the effects of Neutron Diffusion" Prog.Theor.Phys.81. 1085-1090 (1989)

N.Terasawa、K.Sato：“不均匀宇宙中的核论论文和中子扩散的影响”Prog.Theor.Phys.81。

N.Terasawa,H.Reeves,K.Sato,J.Richer: "On the origin of Lithium" Astrophysical Journal. 355. 18-28 (1990)

N.Terasawa、H.Reeves、K.Sato、J.Richer：“论锂的起源”天体物理学杂志。