Fortschritte der Physik

Cover image for Vol. 61 Issue 10

October 2013

Volume 61, Issue 10

Pages 871–966

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Issue Information
    4. Contents
    5. Original Papers
    1. You have free access to this content
      Cover Picture: Fortschritte der Physik 10 / 2013

      Article first published online: 7 OCT 2013 | DOI: 10.1002/prop.201370075

      Thumbnail image of graphical abstract

      The cover page shows snapshots of a decaying Schrödinger cat Wigner function. This is a quasi-probability distribution for the amplitude of a microwave field stored in an ultra-high quality superconducting cavity. A single circular Rydberg atom interacting with a coherent state produces a quantum superposition of two fields with different phases. The two positive peaks in the Wigner function (front) are centered on the classical amplitudes of these components. The interference pattern in-between indicates the quantum nature of the superposition. As time proceeds (from front to rear), the interference pattern vanishes, revealing the rapid decoherence of a mesoscopic quantum state superposition.

  2. Issue Information

    1. Top of page
    2. Cover Picture
    3. Issue Information
    4. Contents
    5. Original Papers
    1. You have free access to this content
      Issue Information: Fortschritte der Physik 10 / 2013

      Article first published online: 7 OCT 2013 | DOI: 10.1002/prop.201370076

  3. Contents

    1. Top of page
    2. Cover Picture
    3. Issue Information
    4. Contents
    5. Original Papers
    1. You have free access to this content
      Contents: Fortschritte der Physik 10 / 2013 (pages 871–872)

      Article first published online: 7 OCT 2013 | DOI: 10.1002/prop.201306110

  4. Original Papers

    1. Top of page
    2. Cover Picture
    3. Issue Information
    4. Contents
    5. Original Papers
    1. Nonassociativity, Malcev algebras and string theory (pages 873–892)

      M. Günaydin and D. Minic

      Article first published online: 26 APR 2013 | DOI: 10.1002/prop.201300010

      Nonassociative structures have appeared in the study of D-branes in curved backgrounds. In recent work, string theory backgrounds involving three-form fluxes, where such structures show up, have been studied in some detail. Here it is pointed out that under certain assumptions these nonassociative structures coincide with nonassociative Malcev algebras. These are generalized to include electric as well as magnetic charges. Their connection to Stueckelberg's generalized Poisson brackets that do not obey the Jacobi identity is investigated. The authors conjecture a natural string-field theoretic generalization of the AdS/CFT-like (holographic)duality.

    2. The intriguing structure of non-geometric frames in string theory (pages 893–925)

      R. Blumenhagen, A. Deser, E. Plauschinn, F. Rennecke and C. Schmid

      Article first published online: 2 JUL 2013 | DOI: 10.1002/prop.201300013

      Non-geometric frames in string theory are related to the geometric ones by certain local O(D,D) transformations, the so-called β-transforms. For each such transformation, it is shown that there exists both a natural field redefinition of the metric and the Kalb-Ramond two-form as well as an associated Lie algebroid. The all-order low-energy effective action of the superstring, written in terms of the redefined fields, can be expressed through differential-geometric objects of the corresponding Lie algebroid, and thus provides a natural framework for effective superstring actions in non-geometric frames.

    3. The spacetime of double field theory: Review, remarks, and outlook (pages 926–966)

      O. Hohm, D. Lüst and B. Zwiebach

      Article first published online: 2 OCT 2013 | DOI: 10.1002/prop.201300024

      Thumbnail image of graphical abstract

      Double field theory (DFT) with emphasis on the doubled spacetime and its generalized coordinate transformations, which unify diffeomorphisms and b-field gauge transformations, is reviewed.

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