Eternal inflation: The inside story
Eternal inflation: The inside story
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DOI：
10.1103/physrevd.74.103516
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发表时间：
2006-11-01
影响因子：
5
通讯作者：
Yang, I-Sheng
中科院分区：
文献类型：
--
作者：
Bousso, Raphael;Freivogel, Ben;Yang, I-Sheng
受黑洞互补性的启发，我们发展了一个因果补丁描述永恒的通货膨胀。我们认为，一个观察者不能归因于一个半经典几何的区域以外的视界，因为大尺度度规是由量子场的波动。为了确定视界内的情况，有必要了解后期渐近性。任何给定的世界线最终都会从永恒的膨胀中退出，进入一个终端真空。如果宇宙学常数是负的，宇宙就会破碎。如果它是零，那么我们发现观察者的命运取决于永恒的通货膨胀机制。由热涨落驱动的永恒暴胀阶段产生的世界线以奇点结束。相比之下，如果永恒的暴胀以气泡成核结束，观察者可以进入一个渐近的局部平坦区域。作为证据表明，气泡碰撞保持这一属性，我们提出了一个精确的解决方案，描述两个气泡的碰撞。
Motivated by the lessons of black hole complementarity, we develop a causal patch description of eternal inflation. We argue that an observer cannot ascribe a semiclassical geometry to regions outside his horizon, because the large-scale metric is governed by the fluctuations of quantum fields. In order to identify what is within the horizon, it is necessary to understand the late time asymptotics. Any given worldline will eventually exit from eternal inflation into a terminal vacuum. If the cosmological constant is negative, the universe crunches. If it is zero, then we find that the observer's fate depends on the mechanism of eternal inflation. Worldlines emerging from an eternal inflation phase driven by thermal fluctuations end in a singularity. By contrast, if eternal inflation ends by bubble nucleation, the observer can emerge into an asymptotic, locally flat region. As evidence that bubble collisions preserve this property, we present an exact solution describing the collision of two bubbles.