Fortschritte der Physik

Cover image for Vol. 65 Issue 3-4

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

Impact Factor: 3.991

ISI Journal Citation Reports © Ranking: 2015: 8/79 (Physics Multidisciplinary)

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. S-duality in N=1 orientifold SCFTs

    Iñaki García-Etxebarria and Ben Heidenreich

    Version of Record online: 20 MAR 2017 | DOI: 10.1002/prop.201700013

    A general solution to the problem of determining all S-dual descriptions for a specific (but very rich) class of inline image SCFTs is presented. These SCFTs are indexed by decorated toric diagrams, and can be engineered in string theory by probing orientifolds of isolated toric singularities with D3 branes. The S-dual phases are described by quiver gauge theories coupled to specific types of conformal matter which we describe explicitly. This construction is illustrated with many examples, including S-dualities in previously unknown SCFTs.

  2. The asymmetric CFT landscape in D=4,6,8 with extended supersymmetry

    Ralph Blumenhagen, Michael Fuchs and Erik Plauschinn

    Version of Record online: 20 MAR 2017 | DOI: 10.1002/prop.201700006

    The authors study asymmetric simple-current extensions of Gepner models in dimensions D = 4; 6; 8 with at least eight supercharges in the right-moving sector. The models obtained in an extensive stochastic computer search belong to a small number of different classes. These classes can be categorized as dimensional reductions, asymmetric orbifolds with inline image, extra gauge enhancement and as coming from the super Higgs-effect. Models in the latter class are particularly interesting, as they may correspond to non-geometric flux compactifications.

  3. What is the magnetic Weak Gravity Conjecture for axions?

    Arthur Hebecker, Philipp Henkenjohann and Lukas T. Witkowski

    Version of Record online: 20 MAR 2017 | DOI: 10.1002/prop.201700011

    The electric Weak Gravity Conjecture demands that axions with large decay constant f couple to light instantons. The resulting large instantonic corrections pose problems for natural ination. An alternative argument based on the magnetic Weak Gravity Conjecture for axions is explored. Roughly speaking, it demands that the minimally charged string coupled to the dual 2-form-field exists in the effective theory. Most naively, such large-f strings curve space too much to exist as static solutions, thus ruling out large-f axions. More conservatively, one might allow non-static string solutions to play the role of the required charged objects. In this case, topological inflation would save the superplanckian axion. Furthermore, a large-f axion may appear in the low-energy effective theory based on two subplanckian axions in the UV. The resulting effective string is a composite object built from several elementary strings and domain walls. It may or may not satisfy the magnetic Weak Gravity Conjecture depending on how strictly the latter is interpreted and on the cosmological dynamics of this composite object, which remain to be fully understood. Finally, the authors recall that large-field brane inflation is naively possible in the codimension-one case and show how string-theoretic back-reaction closes this apparent loophole of large-f (non-periodic) pseudo-axions.

  4. On heterotic vacua with fermionic expectation values

    Ruben Minasian, Michela Petrini and Eirik Eik Svanes

    Version of Record online: 20 MAR 2017 | DOI: 10.1002/prop.201700010

    The authors study heterotic backgrounds with non-trivial H-flux and non-vanishing expectation values of fermionic bilinears, often referred to as gaugino condensates. The gaugini appear in the low energy action via the gauge-invariant three-form bilinear. For Calabi-Yau compactifications to four dimensions, the gaugino condensate corresponds to an internal three-form that must be a singlet of the holonomy group. This condition does not hold anymore when an internal H-flux is turned on. Flux compactifications to three and four-dimensions on G-structure manifolds are studied and the generic conditions for supersymmetric solutions derived.

  5. L∞ Algebras and field theory

    Olaf Hohm and Barton Zwiebach

    Version of Record online: 20 MAR 2017 | DOI: 10.1002/prop.201700014

    The general properties of L algebras focusing on the gauge structure of the associated field theories are reviewed and developed. Motivated by the L homotopy Lie algebra of closed string field theory and the work of Roytenberg and Weinstein describing the Courant bracket in this language the authors investigate the L structure of general gauge invariant perturbative field theories. They sketch such formulations for non-abelian gauge theories, Einstein gravity, and for double field theory. It is found that there is an L algebra for the gauge structure and a larger one for the full interacting field theory. Theories where the gauge structure is a strict Lie algebra often require the full L algebra for the interacting theory. The analysis suggests that L algebras provide a classification of perturbative gauge invariant classical field theories.