Dynamical cobordisms in general relativity and string theory

Simeon Hellerman, Matthew Kleban

    Research output: Contribution to journalArticlepeer-review


    We describe a class of time-dependent solutions in string-or M-theory that are exact with respect to α' and curvature corrections and interpolate in physical space between regions in which the low energy physics is well-approximated by different string theories and string compactifications. The regions are connected by expanding "domain walls" but are not separated by causal horizons, and physical excitations can propagate between them. As specific examples we construct solutions that interpolate between oriented and unoriented string theories, and also between type II and heterotic theories. Our solutions can be weakly curved and under perturbative control everywhere and can asymptote to supersymmetric at late times.

    Original languageEnglish (US)
    Article number022
    JournalJournal of High Energy Physics
    Issue number2
    StatePublished - 2011


    • Space-time symmetries
    • String duality
    • Superstring vacua
    • Superstrings and heterotic strings

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics


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