Department of Physics and Astronomy, University College London, United Kingdom.
Phys Rev Lett. 2011 Aug 12;107(7):071301. doi: 10.1103/PhysRevLett.107.071301. Epub 2011 Aug 8.
The eternal inflation scenario predicts that our observable Universe resides inside a single bubble embedded in a vast inflating multiverse. We present the first observational tests of eternal inflation, performing a search for cosmological signatures of collisions with other bubble universes in cosmic microwave background data from the WMAP satellite. We conclude that the WMAP 7-year data do not warrant augmenting the cold dark matter model with a cosmological constant with bubble collisions, constraining the average number of detectable bubble collisions on the full sky N(s) < 1.6 at 68% C.L. Data from the Planck satellite can be used to more definitively test the bubble-collision hypothesis.
永恒暴胀场景预言我们可观测的宇宙处于一个镶嵌在暴胀多重宇宙中的单一泡泡里。我们提出了永恒暴胀的第一个观测检验，通过对来自威尔金森微波各向异性探测器卫星的宇宙微波背景数据的搜寻，寻找与其他泡泡宇宙碰撞的宇宙学信号。我们得出结论，威尔金森微波各向异性探测器 7 年数据不支持用与泡泡碰撞相关的宇宙常数来扩充冷暗物质模型，在全天平均可检测到的泡泡碰撞数 N(s) < 1.6 下限制了置信度为 68%。来自普朗克卫星的数据可被用来更明确地检验泡泡碰撞假说。
