Fortschritte der Physik

Cover image for Vol. 63 Issue 9-10

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

Impact Factor: 2.442

ISI Journal Citation Reports © Ranking: 2014: 17/78 (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. Pioneer 10 and 11 Spacecraft Anomalous Acceleration in the light of the Nonsymmetric Kaluza–Klein (Jordan–Thiry) Theory

    M. W. Kalinowski

    Article first published online: 8 OCT 2015 | DOI: 10.1002/prop.201500046

    The Nonsymmetric Kaluza–Klein (Jordan–Thiry) Theory leads to a model of a modified acceleration that can fit an anomalous acceleration experienced by the Pioneer 10 and 11 spacecraft. The future positions of those spacecrafts are predicted using distorted hyperbolic orbit. A connection between an anomalous acceleration and a Hubble constant is solved in the theory together with a relation to a cosmological constant in CDMΛ model. In the paper we consider an exact solution of a point mass motion in the Solar System under an influence of an anomalous acceleration. We find two types of orbits: periodic and chaotic. Both orbits are bounded. This means there is no possibility to escape from the Solar System. Some possibilities to avoid this conclusion are considered. We resolve also a coincidence between an anomalous acceleration and the cosmological constant using a paradigm of modern cosmology. Relativistic effects and a cosmological drifting of a gravitational constant are considered. The model of an anomalous acceleration does not cause any contradiction with Solar System observations. We give a full statistical analysis of the model. We consider also a full formalism of the Nonsymmetric Jordan–Thiry Theory for the problem and present a relativistic model of an anomalous acceleration. We consider the model for General Relativity approximation, i.e. inline image (inline image). In this model there are no contradictions with General Relativity tests in the Solar System. Pioneer 10/11 spacecrafts will come back in 106 years (a time scale of our periodic solutions is 106 years). Moreover, almost relativistic or relativistic spacecrafts can escape from the Solar System. We consider also a model of a relativistic acceleration which is more complicated, with inline image taken into account.

  2. Notes on generalized global symmetries in QFT

    Eric Sharpe

    Article first published online: 30 SEP 2015 | DOI: 10.1002/prop.201500048

    It was recently argued that quantum field theories possess one-form and higher-form symmetries, labelled ‘generalized global symmetries.’ In this paper, we describe how those higher-form symmetries can be understood mathematically as special cases of more general 2-groups and higher groups, and discuss examples of quantum field theories admitting actions of more general higher groups than merely one-form and higher-form symmetries. We discuss analogues of topological defects for some of these higher symmetry groups, relating some of them to ordinary topological defects. We also discuss topological defects in cases in which the moduli ‘space’ (technically, a stack) admits an action of a higher symmetry group. Finally, we outline a proposal for how certain anomalies might potentially be understood as describing a transmutation of an ordinary group symmetry of the classical theory into a 2-group or higher group symmetry of the quantum theory, which we link to WZW models and bosonization.

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    Cover Picture: Fortschritte der Physik 9–10 / 2015

    Article first published online: 7 SEP 2015 | DOI: 10.1002/prop.201570014

    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 9–10 / 2015

    Article first published online: 7 SEP 2015 | DOI: 10.1002/prop.201570015

  5. (MS)SM-like models on smooth Calabi-Yau manifolds from all three heterotic string theories (pages 609–632)

    Stefan Groot Nibbelink, Orestis Loukas and Fabian Ruehle

    Article first published online: 7 SEP 2015 | DOI: 10.1002/prop.201500041

    The authors perform model searches on smooth Calabi-Yau compactifications for both the supersymmetric E8 × E8 and SO(32) as well as for the non-supersymmetric SO(16) × SO(16) heterotic strings simultaneously. Line bundle backgrounds on both favorable Complete Intersection Calabi-Yaus (CICYs) with relatively small Hodge number h11 and the Schoen manifold are considered. Using Gram matrices the paper systematically analyzes the combined consequences of the Bianchi identities and the tree-level Donaldson-Uhlenbeck-Yau equations inside the Kähler cone. In order to evaluate the model building potential of the three heterotic theories on the various geometries, computer-aided scans are used. A large number of GUT-like models (up to a few hundred thousands on the various geometries for the three heterotic theories) gas been generated becoming (MS)SM-like upon using a freely acting Wilson line. For all three heterotic theories tables and figures are presented summarizing the potentially phenomenologically interesting models which were obtained during the model scans.