研究了∧CDM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∧CDM宇宙t*-t0=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.