Annalen der Physik

Cover image for Vol. 18 Issue 4

April 2009

Volume 18, Issue 4

Pages 187–282

  1. Cover Picture

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

      Article first published online: 15 APR 2009 | DOI: 10.1002/andp.200990004

  2. Contents

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Original Papers
    5. Erratum
    1. Contents: Ann. Phys. 4/2009 (pages 187–188)

      Article first published online: 15 APR 2009 | DOI: 10.1002/andp.200918004

  3. Original Papers

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Original Papers
    5. Erratum
    1. Improved analytical approximation to arbitrary l-state solutions of the Schrödinger equation for the hyperbolical potential (pages 189–197)

      S.M. Ikhdair and R. Sever

      Article first published online: 15 APR 2009 | DOI: 10.1002/andp.200810349

      A new approximation scheme to the centrifugal term is proposed to obtain the l ≠ 0 bound-state solutions of the Schrödinger equation for an exponential-type potential in the framework of the hypergeometric method. The corresponding normalized wave functions are also found in terms of the Jacobi polynomials. To show the accuracy of the new proposed approximation scheme, we calculate the energy eigenvalues numerically for arbitrary quantum numbers n and l with two different values of the potential parameter σ0.

    2. Evaluation of the scientific impact, productivity and biological age based upon the h-index in three Latin American countries: the materials science case (pages 198–205)

      A.H. Romero, A. García and M. Kiwi

      Article first published online: 15 APR 2009 | DOI: 10.1002/andp.200910346

      Thumbnail image of graphical abstract

      We discuss the scientific impact of Latin American scientists in the field of materials science. The analysis is based on the h-index as the scientometric index used to quantify the scientific productivity of an individual. … We also analyzed the h-index as function of the biological age, by using the first year of publication of a given scientists as a reference and discussed the general distribution of its quantification. …

    3. On the pre-metric foundations of wave mechanics I: massless waves (pages 206–230)

      D.H. Delphenich

      Article first published online: 15 APR 2009 | DOI: 10.1002/andp.200810343

      Thumbnail image of graphical abstract

      The mechanics of wave motion in a medium are founded in conservation laws for the physical quantities that the waves carry, combined with the constitutive laws of the medium, and define Lorentzian structures only in degenerate cases of the dispersion laws that follow from the field equations. …

    4. A new look at Bell's inequalities and Nelson's theorem (pages 231–270)

      B. Schulz

      Article first published online: 20 MAR 2009 | DOI: 10.1002/andp.200810345

      Thumbnail image of graphical abstract

      In 1985, Edward Nelson, who formulated the theory of stochastic mechanics, made an interesting remark about Bell's theorem. Nelson analysed the latter in the light of classical fields that behave randomly. He found that if a stochastic hidden variable theory fulfils certain conditions, the inequality of Bell can be violated. Moreover, Nelson was able to prove that this may happen without any instantaneous communication between the two spatially separated measurement stations. …

    5. Thermal photon dispersion law and modified black-body spectra (pages 271–280)

      J. Ludescher and R. Hofmann

      Article first published online: 15 APR 2009 | DOI: 10.1002/andp.200910348

      Thumbnail image of graphical abstract

      Based on the postulate that photon propagation is governed by an SU(2) gauge principle we numerically compute the one-loop dispersion for thermalized photon propagation on the radiatively induced mass shell. …

  4. Erratum

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Original Papers
    5. Erratum
    1. You have free access to this content
      Rigorous solution of a Hubbard model extended by nearest-neighbour Coulomb and isotropic exchange interaction on a triangle and tetrahedron (pages 281–282)

      R. Schumann

      Article first published online: 15 APR 2009 | DOI: 10.1002/andp.200910347

      In connection with the study of the extended Hubbard model on an isosceles triangular cluster, we discovered a factor two error in the coding of the Ising part of the Heisenberg term in the Hamiltonian. In consequence the rigorous results remain valid, but not for the isotropic Heisenberg model, but for an anisotropic Heisenberg model.

      This article corrects:

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