论文标题
在存在宇宙弦的情况下真空衰减
Vacuum decay in the presence of a cosmic string
论文作者
论文摘要
我们研究了在DS时空中存在宇宙弦的情况下的假真空衰减和气泡成核。宇宙弦在时空周围引起一个缺陷角度，因此成核的气泡具有橄榄球球的形状。在薄壁近似和使用连接条件下工作，我们研究气泡壁的动力学并计算欧几里得作用。在我们的分析中，一个有趣的特征是，弦的张力被气泡筛选，使得气泡内的观察者与外部观察者相比测量张力的值不同。我们表明，与Coleman-De Luccia Instanton相比，该弦可以充当催化剂，其中成核速率提高了。但是，通常，成核速率不是两种紧张局部差异的单调函数，因此在参数空间的某些区域中，成核速率可能小于Coleman-DE Luccia气泡。
We study the false vacuum decay and bubble nucleation in the presence of a cosmic string in dS spacetime. A cosmic string induces a deficit angle in spacetime around itself so the nucleated bubble has the shape of a rugby ball. Working in thin wall approximation and using the junction conditions we study the dynamics of the bubble wall and calculate the Euclidean action. An interesting feature in our analysis is that the tension of the string is screened by the bubble such that an observer inside the bubble measures a different value of the tension than an outside observer. We show that the string can act as a catalyzer in which the nucleation rate is enhanced compared to the Coleman-de Luccia instanton. However, in general, the nucleation rate is not a monotonic function of the difference between the two tensions so in some regions of the parameters space the nucleation rate may be smaller than the Coleman-de Luccia bubble.
