Observing the multiverse with cosmic wakes

Matthew Kleban, Thomas S. Levi, Kris Sigurdson

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Current theories of the origin of the Universe, including string theory, predict the existence of a multiverse with many bubble universes. These bubble universes may collide, and collisions with ours produce cosmic wakes that enter our Hubble volume, appear as unusually symmetric disks in the cosmic microwave background, and disturb large scale structure. There is preliminary evidence consistent with one or more of these disturbances on our sky. However, other sources can produce similar features in the cosmic microwave background, and so additional signals are needed to verify their extra-universal origin. Here we find, for the first time, the detailed three-dimensional shape, temperature, and polarization signals of the cosmic wake of a bubble collision consistent with current observations. The polarization pattern has distinct features that when correlated with the corresponding temperature pattern are a unique and striking signal of a bubble collision. These features represent a verifiable prediction of the multiverse paradigm and might be detected by current or future experiments. A detection of a bubble collision would confirm the existence of the multiverse, provide compelling evidence for the string theory landscape, and sharpen our picture of the Universe and its origins.

    Original languageEnglish (US)
    Article number041301
    JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
    Volume87
    Issue number4
    DOIs
    StatePublished - Feb 21 2013

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics
    • Physics and Astronomy (miscellaneous)

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