ΛCDM宇宙中的弦圈演化  

The evolution of the cosmic string loop in ΛCDM universe

作　　者：李新洲[1] 敖犀晨[1] 

机构地区：[1]上海师范大学天体物理中心,上海200234

出　　处：《上海师范大学学报（自然科学版）》2007年第4期1-4,共4页Journal of Shanghai Normal University(Natural Sciences)

基　　金：国家自然科学基金(10473007).

摘　　要：研究了ACDM宇宙中的宇宙弦圈的演化,弦圈是否会从收缩相转入膨胀相将由暗能量的态方程参数确定.在当前的观测值范围内,现时宇宙不存在弦圈膨胀相,但在将来某一时刻t_*进入膨胀相.特别地,对于ΛCDM宇宙t_*-t_0=4.89Gyr.The evolution of the cosmic string loop in ∧CDM universe is discussed in this paper. Whether the cosmic string loop is able to transit from collapse to expansion is determined by the equation of state parameter of dark energy. The present observation implies that none loops are expanding. However, at some time t＊ in the future, these loops will expand. In particular, as to∧CDM universe, t＊-t0 = 4. 89C.yr.

关 键 词：宇宙弦 暗能量 宇宙学常数 标度因子 

分 类 号：P159[天文地球—天文学]