Unwinding inflation

Guido D'Amico, Roberto Gobbetti, Matthew Kleban, Marjorie Schillo

    Research output: Contribution to journalArticle

    Abstract

    Higher-form flux that extends in all 3+1 dimensions of spacetime is a source of positive vacuum energy that can drive meta-stable eternal inflation. If the flux also threads compact extra dimensions, the spontaneous nucleation of a bubble of brane charged under the flux can trigger a classical cascade that steadily unwinds many units of flux, gradually decreasing the vacuum energy while inflating the bubble, until the cascade ends in the self-annihilation of the brane into radiation. With an initial number of flux quanta Q 0≳N, this can result in N efolds of inflationary expansion while producing a scale-invariant spectrum of adiabatic density perturbations with amplitude and tilt consistent with observation. The power spectrum has an oscillatory component that does not decay away during inflation, relatively large tensor power, and interesting non-Gaussianities. Unwinding inflation fits naturally into the string landscape, and our preliminary conclusion is that consistency with observation can be attained without fine-tuning the string parameters. The initial conditions necessary for the unwinding phase are produced automatically by bubble formation, so long as the critical radius of the bubble is smaller than at least one of the compact dimensions threaded by flux.

    Original languageEnglish (US)
    Article number004
    JournalJournal of Cosmology and Astroparticle Physics
    Volume2013
    Issue number3
    DOIs
    StatePublished - Mar 2013

    Keywords

    • cosmology with extra dimensions
    • ination
    • initial conditions and eternal universe

    ASJC Scopus subject areas

    • Astronomy and Astrophysics

    Fingerprint Dive into the research topics of 'Unwinding inflation'. Together they form a unique fingerprint.

  • Cite this

    D'Amico, G., Gobbetti, R., Kleban, M., & Schillo, M. (2013). Unwinding inflation. Journal of Cosmology and Astroparticle Physics, 2013(3), [004]. https://doi.org/10.1088/1475-7516/2013/03/004