Fortschritte der Physik

Cover image for Vol. 63 Issue 2

Editor: Dieter Lüst, Wolfgang Schleich (Co-Editor)

Online ISSN: 1521-3978

Associated Title(s): Annalen der Physik

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AdS/CFT correspondence · black holes · conformal fields · cosmology · d-branes · gauge fields · gravity · Lie algebras · noncommutative geometry · quantum entanglement · quantum field theories · quantum gravity · quantum groups · quantum information · quantum physics · qubits · standard model · string theories · supergravity · supersymmetry ·

Recently Published Articles

  1. Off-shell Amplitudes in Superstring Theory

    Ashoke Sen

    Article first published online: 11 FEB 2015 | DOI: 10.1002/prop.201500002

    Computing the renormalized masses and S-matrix elements in string theory, involving states whose masses are not protected from quantum corrections, requires defining off-shell amplitude with certain factorization properties. While in the bosonic string theory one can in principle construct such an amplitude from string field theory, there is no fully consistent field theory for type II and heterotic string theory. In this paper we give a practical construction of off-shell amplitudes satisfying the desired factorization property using the formalism of picture changing operators. We describe a systematic procedure for dealing with the spurious singularities of the integration measure that we encounter in superstring perturbation theory. This procedure is also useful for computing on-shell amplitudes, as we demonstrate by computing the effect of Fayet-Iliopoulos D-terms in four dimensional heterotic string theory compactifications using this formalism.

  2. Generalized Born–Infeld actions and projective cubic curves

    S. Ferrara, M. Porrati, A. Sagnotti, R. Stora and A. Yeranyan

    Article first published online: 3 FEB 2015 | DOI: 10.1002/prop.201400087

    We investigate inline image supersymmetric Born–Infeld Lagrangians with a second non–linearly realized supersymmetry. The resulting non–linear structure is more complex than the square root present in the standard Born–Infeld action, and nonetheless the quadratic constraints determining these models can be solved exactly in all cases containing three vector multiplets. The corresponding models are classified by cubic holomorphic prepotentials. Their symmetry structures are associated to projective cubic varieties.

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    Contents: Fortschritte der Physik 2 / 2015 (pages A3–A4)

    Article first published online: 27 JAN 2015 | DOI: 10.1002/prop.201520002

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    Cover Picture: Fortschritte der Physik 2 / 2015

    Article first published online: 27 JAN 2015 | DOI: 10.1002/prop.201570004

    Thumbnail image of graphical abstract

    The cover page shows absorption images of four Bose-Einstein condensates generated consecutively during the nine seconds of free fall in a single launch of the catapult located at the bottom of the Bremen Drop Tower. The condensates were observed at different times (25, 50, 75 and 100 ms), illustrating the expansion of the wave-packet. This experiment was performed using in a miniaturized ultra-cold atom trap by the QUANTUS collaboration supported by the German Space Agency DLR. The graphics was designed by Jan Rudolph and Holger Ahlers from the group of Prof. Ernst Maria Rasel (Leibniz Universität Hannover).

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    Issue Information: Fortschritte der Physik 2 / 2015

    Article first published online: 27 JAN 2015 | DOI: 10.1002/prop.201570005