观察世界碰撞：宇宙学气泡碰撞对CMB的影响
Watching Worlds Collide: Effects on the CMB from Cosmological Bubble Collisions
摘要：
我们扩展了我们以前关于Coleman-de Luccia气泡碰撞宇宙学的工作。在一组近似中，我们计算了从经历了这样的碰撞的气泡内部看到的对宇宙微波背景（CMB）的影响。我们发现，这些效应在性质上总是相似的--一种仅取决于与碰撞方向的角度的各向异性--但可以产生不同大小的冷点或热点，以及沿着碰撞所确定的轴的功率不对称。在其他参数保持不变的情况下，随着我们的泡沫内部发生的暴胀量的增加，这种效应会减弱，但一般来说，在解决视界和平坦性问题所需的时间之后，这种效应会维持10倍。在参数空间的某些区域，效应可以在任意长的暴胀中存活。
英文摘要：
We extend our previous work on the cosmology of Coleman-de Luccia bubble collisions. Within a set of approximations we calculate the effects on the cosmic microwave background (CMB) as seen from inside a bubble which has undergone such a collision. We find that the effects are always qualitatively similar--an anisotropy that depends only on the angle to the collision direction--but can produce a cold or hot spot of varying size, as well as power asymmetries along the axis determined by the collision. With other parameters held fixed the effects weaken as the amount of inflation which took place inside our bubble grows, but generically survive order 10 efolds past what is required to solve the horizon and flatness problems. In some regions of parameter space the effects can survive arbitrarily long inflation.
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