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Contents Ann. Phys. 72010

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Ann. Phys. (Berlin) 522, No. 7, 445 – 446 (2010) / DOI 10.1002/andp.201052207
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Page 447 – 455
K. Bakke and C. Furtado
Scalar Aharonov-Bohm effect in the presence of a topological
In this paper the scalar Aharonov-Bohm effect for a neutral particle possessing a magnetic dipole moment in the presence of a cosmic string is studied.
The authors study the phase shift acquired by the wave function of the neutral
particle in the presence of this topological defect, . . .
Page 456 – 466
Salvatore Esposito and Giovanni Salesi
Fundamental times, lengths and physical constants: Some
unknown contributions by Ettore Majorana
The authors review the introduction in physics of the concepts of an elementary space length and of a fundamental time scale, analyzing some related
unknown contributions by Ettore Majorana. In particular, they discuss the
quasi-Coulombian scattering in presence of a finite length scale, as well as the
introduction of an intrinsic (universal) time delay in the expressions for the
retarded electromagnetic potentials. . . .
Page 467 – 519
C. Wetterich
Probabilistic observables, conditional correlations, and quantum
The author discusses the classical statistics of isolated subsystems. Only a
small part of the information contained
in the classical probability distribution
for the subsystem and its environment
is available for the description of the
isolated subsystem. The “coarse grainσ=2
ing of the information” to micro-states
implies probabilistic observables. For
two-level probabilistic observables
only a probability for finding the values
one or minus one can be given for any
micro-state, while such observables could be realized as classical observables
with sharp values on a substate level. . . .
© 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Page 520 – 523
Diane G. Demers
Reply to da Rocha and Rodrigues’ comments on the orientation
congruent algebra and twisted forms in electrodynamics
The recent claim by da Rocha and Rodrigues that the nonassociative orientation congruent algebra (OC algebra) and native Clifford algebra are incompatible with the Clifford bundle approach is false. The new native Clifford bundle
approach, in fact, subsumes the ordinary Clifford bundle one. Associativity
is an unnecessarily too strong a requirement for physical applications. Consequently, we obtain a new principle of nonassociative irrelevance for physically meaningful formulas. In addition, the adoption of formalisms that respect the native representation of twisted (or odd) objects and physical quantities is required for the advancement of mathematics, physics, and engineering
because they allow equations to be written in sign-invariant form. This perspective simplifies the analysis of, resolves questions about, and ends needless
controversies over the signs, orientations, and parities of physical quantities.
Page 524 – 531
Jian Qi Shen
Anisotropic distribution of quantum-vacuum momentum density
in a moving electromagnetic medium
An isotropic electromagnetic medium becomes gyrotropically anisotropic
when it moves, and an anisotropic electromagnetic environment can then be
created in this motion-induced anisotropic medium. One of the most remarkable features is that the quantum vacuum in the anisotropic electromagnetic
environment exhibits a nonzero electromagnetic momentum density, since
the universal symmetry of the vacuum fluctuation field is broken, and the
anisotropic quantum vacuum mode structure is produced because of the symmetry breaking. This would give rise to a noncompensation effect among the
four vacuum eigenmodes (i. e., the forward and backward propagating modes
as well as their respective mutually perpendicular polarized components),
and leads to an anisotropic correction to the vacuum momentum in the moving medium. The physical significance and the potential applications of the
anisotropic quantum vacuum are discussed. This quantum-vacuum effect may
be used to develop sensitive sensor techniques and to design new quantum
optical and photonic devices.
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© 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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