Watching worlds collide: Effects on the CMB from cosmological bubble collisions

Spencer Chang, Matthew Kleban, Thomas S. Levi

    Research output: Contribution to journalArticlepeer-review


    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.

    Original languageEnglish (US)
    Article number025
    JournalJournal of Cosmology and Astroparticle Physics
    Issue number4
    StatePublished - 2009


    • CMBR experiments
    • Cosmological phase transitions
    • Cosmology of theories beyond the SM
    • String theory and cosmology

    ASJC Scopus subject areas

    • Astronomy and Astrophysics


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