Effective lagrangians for four-dimensional superstrings

Sergio Ferrara, Luciano Girardello, Costas Kounnas, Massimo Porrati

    Research output: Contribution to journalArticlepeer-review


    We derive effective supergravity lagrangians for the massless sector of new four-dimensional superstrings. The untwisted sector is obtained by suitable Z2 or Z2 ⊗ Z2 truncations of N = 4, D = 4 lagrangians. For the N = 1 "minimal" models, related to the N = 4, SO(44) superstrings, we derive the Kähler potential, the superpotential and the f{hook} gauge kinetic function. The underlying nonlinear sigma model is based on the Kähler manifold [SU(1,1)/U(1)] ⊗ Πi = 13 {SO(2, ni)/[SO(2) ⊗ SO(ni)]}. For models without massless twisted sector, this result provides the full superstring low-energy effective action. For models with massless twisted sector, the N = 1 theory may be obtained once the quaternionic manifold of the corresponding N = 2 hypermultiplets is specified.

    Original languageEnglish (US)
    Pages (from-to)368-376
    Number of pages9
    JournalPhysics Letters B
    Issue number3-4
    StatePublished - Jul 2 1987

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics


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