额外维和宇宙氦丰度的相关性质研究  

Study on the Correlation Properties between Extra Dimension and Cosmic Helium Abundance

作　　者：黎聪笑 颜骏[1] 赵峰 LI Congxiao;YAN Jun;ZHAO Feng(College of Physics and Electronic Engineering,Sichuan Normal University,Chengdu 610066,Sichuan)

机构地区：[1]四川师范大学物理与电子工程学院,四川成都610066

出　　处：《四川师范大学学报（自然科学版）》2021年第1期91-98,共8页Journal of Sichuan Normal University（Natural Science）

基　　金：四川省教育厅自然科学基金(11ZA100)。

摘　　要：根据Mukhanov反应率表达式计算宇宙氦丰度的数值,当额外维空间存在时,通过精细耦合常数α、弱作用耦合常数GW、引力耦合常数G的变化关系推导修正的平衡方程,同时计算额外维数d变化时宇宙氦丰度的修正值.当额外维标度因子的变化值取ε=10^-2和ε=10^-3时,分别计算额外维空间维数由d=2~11时的氦丰度值.另外,对额外维标度因子随时间振荡变化的氦丰度值的计算结果表明:如标度因子的变化值取ε=10^-2或δ=10^-3时,氦丰度有一定变化;如标度因子变化值取ε=10^-3或δ=10^-3时,氦丰度的变化不明显.In this paper,the value of helium abundance in the universe is calculated according to Mukhanov’s modified reaction rate expression.When the extra dimension space exists,the modified equilibrium equation is deduced by using the changed relation of the fine coupling constant,the weak interaction coupling constant and the gravitational coupling constant.At the same time,the correction values of helium abundance in the universe are calculated when the extra dimension d changes.When the change of the extra dimension scale factor is taken asε=10^-2 andε=10^-3,the helium abundance values are calculated,respectively,from d=2 to d=11.In addition,the helium abundance values are also calculated if extra dimensional scale factor is oscillational varying with time.The results show that there has been some change of the helium abundances values when the change of the extra dimension scale factor is taken as theε=10^-2 orδ=10^-3,and the variation of helium abundance is not obvious if change of the extra dimension scale factor is taken as theε=10^-3 orδ=10^-3.

关 键 词：额外维空间 耦合常数 Mukhanov反应率 修正氦丰度 

分 类 号：O412.2[理学—理论物理] O572.24[理学—物理]