Fortschritte der Physik

Cover image for Vol. 61 Issue 12

December 2013

Volume 61, Issue 12

Pages 1029–1153

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Issue Information
    4. Contents
    5. Original Papers
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      Cover Picture: Fortschritte der Physik 12 / 2013

      Article first published online: 2 DEC 2013 | DOI: 10.1002/prop.201370079

      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 12 / 2013

      Article first published online: 2 DEC 2013 | DOI: 10.1002/prop.201370080

  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
  4. Original Papers

    1. Top of page
    2. Cover Picture
    3. Issue Information
    4. Contents
    5. Original Papers
    1. Revisiting toric SU(3) structures (pages 1031–1055)

      M. Larfors

      Article first published online: 14 OCT 2013 | DOI: 10.1002/prop.201300028

      Three-dimensional smooth compact toric varieties (SCTV) admit SU(3) structures, and may thus be relevant for string compactifications if they have even first Chern class (c1). This condition can be fulfilled by infinitely many SCTVs, including CP3 and CP1 bundles over all two-dimensional SCTVs. We show that as long as c1 is even, toric SU(3) structures can be constructed using a method proposed earlier. We perform a systematic study of the parametric freedom of the resulting SU(3) structures, with a particular focus on the metric and the torsion classes.

    2. Lie algebroids, non-associative structures and non-geometric fluxes (pages 1056–1153)

      A. Deser

      Article first published online: 14 OCT 2013 | DOI: 10.1002/prop.201300027

      In the first part of this article, the geometry of Lie algebroids as well as the Moyal-Weyl star product and some of its generalizations in open string theory are reviewed. A brief introduction to T-duality and nongeometric fluxes is given. Based on these foundations, more recent results are discussed in the second part of the article. Closed string theory with flat background and constant H-flux is analysed. Focussing on the target space and the local appearance of the various fluxes, an algebra based on vector fields is proposed, whose structure functions are given by the fluxes. A proof is given for a special Courant algebroid structure on the generalized tangent bundle, where the fluxes are realized by the commutation relations of a basis of sections. It turns out that Lie algebroids are the right language to answer this question positively.

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