Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2006-06-14
Phys.Rev.D74:103516,2006
Physics
High Energy Physics
High Energy Physics - Theory
17 pages, 12 figures; v2, PRD format
Scientific paper
10.1103/PhysRevD.74.103516
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.
Bousso Raphael
Freivogel Ben
Yang I-Sheng
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