Annalen der Physik

Cover image for Vol. 18 Issue 9

September 2009

Volume 18, Issue 9

Pages 605–670

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Original Papers
    1. Cover Picture: Ann. Phys. 9/2009

      Article first published online: 8 OCT 2009 | DOI: 10.1002/andp.200990009

  2. Contents

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Original Papers
    1. Contents: Ann. Phys. 9/2009 (pages 605–606)

      Article first published online: 8 OCT 2009 | DOI: 10.1002/andp.200918009

  3. Original Papers

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Original Papers
    1. The influence of self-citation corrections and the fractionalised counting of multi-authored manuscripts on the Hirsch index (pages 607–621)

      M. Schreiber

      Article first published online: 17 AUG 2009 | DOI: 10.1002/andp.200910360

      Thumbnail image of graphical abstract

      The Hirsch index or h-index is widely used to quantify the impact of an individual's scientific research output, determining the highest number h of a scientist's papers that received at least h citations. Fractionalised counting of the publications is an appropriate way to distribute the impact of a paper among all the coauthors of a multi-authored manuscript in an easy way, leading to a simple modification hm of the h-index. On the other hand the exclusion of self-citations allows one to sharpen the index, what is appropriate, because self-citations are usually not reflecting the significance of a publication. …

    2. Mixtures of correlated bosons and fermions: Dynamical mean-field theory for normal and condensed phases (pages 622–633)

      K. Byczuk and D. Vollhardt

      Article first published online: 17 AUG 2009 | DOI: 10.1002/andp.200910362

      A dynamical mean-field theory for mixtures of interacting bosons and fermions on a lattice (BF-DMFT) is derived. The BF-DMFT is a comprehensive, thermodynamically consistent framework for the theoretical investigation of Bose-Fermi mixtures and is applicable for arbitrary values of the coupling parameters and temperatures. It becomes exact in the limit of high spatial dimensions d or coordination number Z of the lattice. In particular, the BF-DMFT treats normal and condensed bosons on equal footing and thus includes the effects caused by their dynamic coupling. Using the BF-DMFT two different interaction models of correlated lattice bosons and fermions are investigated, one where all particles are spinless (model I) and one where fermions carry a spin one-half (model II). In model I the local, repulsive interaction between bosons and fermions can give rise to an attractive effective interaction between the bosons. In model II it can also lead to an attraction between the fermions.

    3. Low-frequency line temperatures of the CMB (Cosmic Microwave Background) (pages 634–639)

      R. Hofmann

      Article first published online: 17 AUG 2009 | DOI: 10.1002/andp.200910361

      Thumbnail image of graphical abstract

      Based on SU(2) Yang-Mills thermodynamics the Aracde2's and the results of earlier radio-surveys on low-frequency cosmic microwave background (CMB) line temperatures are interpreted as a phase-boundary effect. The excess at low frequencies by evanescent, nonthermal photon fields of the CMB whose intensity is nulled by that of Planck distributed calibrator photons is explained. …

    4. Nonlocal transformations for accelerated observers (pages 640–648)

      B. Mashhoon

      Article first published online: 17 AUG 2009 | DOI: 10.1002/andp.200910363

      According to the locality postulate of special relativity, the measurements of physical fields by accelerated observers at a given event in Minkowski spacetime are related to each other by the representations of the Lorentz group. Nonlocal extensions of these representations are necessary, however, once acceleration-induced onlocality is taken into account. The particular case of Dirac spinors is treated in detail and the corresponding nonlocal transformation group is studied.

    5. On the variational formulation of systems with non-holonomic constraints (pages 649–670)

      D.H. Delphenich

      Article first published online: 17 AUG 2009 | DOI: 10.1002/andp.200910364

      Thumbnail image of graphical abstract

      In a previous article by the author, it was shown that one could effectively give a variational formulation to non-conservative mechanical systems by starting with the first variation functional instead of an action functional. In this article, it is shown

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