New old inflation

Gia Dvali, Shamit Kachru

    Research output: Chapter in Book/Report/Conference proceedingChapter

    Abstract

    We propose a new class of inflationary solutions to the standard cosmological problems (horizon, flatness, monopole,…), based on a modification of old inflation. These models do not require a potential which satisfies the normal inflationary slow-roll conditions. Our universe arises from a single tunneling event as the inflation leaves the false vacuum. Subsequent dynamics (arising from either the oscillations of the inflation field or thermal effects) keep a second field trapped in a false minimum, resulting in an evanescent period of inflation (with roughly 50 e-foldings) inside the bubble. This easily allows the bubble to grow sufficiently large to contain our present horizon volume. Reheating is accomplished when the inflation driving the last stage of inflation rolls down to the true vacuum, and adiabatic density perturbations arise from moduli-dependent Yukawa couplings of the inflation to matter fields. Our scenario has several robust predictions, including virtual absence of gravity waves, a possible absence of tilt in scalar perturbations, and a higher degree of non-Gaussianity than other models. It also naturally incorporates a solution to the cosmological moduli problem.

    Original languageEnglish (US)
    Title of host publicationFrom Fields to Strings
    Subtitle of host publicationCircumnavigating Theoretical Physics: Ian Kogan Memorial Collection
    PublisherWorld Scientific Publishing Co.
    Pages1131-1155
    Number of pages25
    Volume1
    ISBN (Electronic)9789812775344
    ISBN (Print)9789812389558
    DOIs
    StatePublished - Jan 1 2005

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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  • Cite this

    Dvali, G., & Kachru, S. (2005). New old inflation. In From Fields to Strings: Circumnavigating Theoretical Physics: Ian Kogan Memorial Collection (Vol. 1, pp. 1131-1155). World Scientific Publishing Co.. https://doi.org/10.1142/9789812775344_0026