134,757 research outputs found
Magnetic Monopole and the Finite Photon Mass: Are They Compatible?
We analyze the role played by the gauge invariance for the existence of Dirac
monopole. To this end, we consider the electrodynamics with massive photon and
ask if the magnetic charge can be introduced there. We show that the derivation
of the Dirac quantization condition based on the angular momentum algebra
cannot be generalized to the case of massive electrodynamics. Possible
implications of this result are briefly discussed.Comment: 12 pages, revtex, no figure
The Charged Neutrino: A New Approach to the Solar Neutrino Problem
We have considered the effect of the reduction of the solar neutrino flux on
earth due to the deflection of the charged neutrino by the magnetic field of
the solar convective zone. The antisymmetry of this magnetic field about the
plane of the solar equator induces the anisotropy of the solar neutrino flux
thus creating the deficit of the neutrino flux on the earth. The deficit has
been estimated in terms of solar and neutrino parameters and the condition of a
50 \% deficit has been obtained: Q_{\nu} gradH \agt 10^{-18} eG/cm where
is the neutrino electric charge, is the gradient of the solar
toroidal magnetic field, e is the electron charge. Some attractive experimental
consequences of this scenario are qualitatively discussed.Comment: 15 pages, UM-P/94-26, in REVTE
Effects of extended impurity perturbation in d-wave superconductor
We describe the effects of electronic perturbation distributed on nearest
neighbor sites to the impurity center in a planar \textit{d}-wave
superconductor, in approximation of circular Fermi surface. Alike the behavior
previously reported for point-like perturbation and square Fermi surface, the
quasiparticle density of states can display a resonance
inside the gap (and very weak features from low symmetry representations of
non-local perturbation) and asymptotically vanishes at as
. The local suppression of SC order parameter
in this model is found to be somewhat weaker than for an equivalent point-like
(non-magnetic) perturbation and much weaker than for a spin-dependent
(extended) perturbation.Comment: 7 pages, 5 figures, some minor typos and the curves in Fig. 5
correcte
Black holes with magnetic charge and quantized mass
We examine the issue of magnetic charge quantization in the presence of black
holes. It is pointed out that quantization of magnetic charge can lead to the
mass quantization for magnetically charged black holes. We also discuss some
implications for the experimental searches of magnetically charged black holes.Comment: RevTeX, 11 pages, Invited paper for the first editorial volume of the
book series "Contemporary Fundamental Physics" by the Nova Science Publisher
Absolute and differential measurement of water vapor supersaturation using a commercial thin-film sensor
We describe a technique for measuring the water vapor supersaturation of normal air over a temperature range of –40<~T<~0 °C. The measurements use an inexpensive commercial hygrometer which is based on a thin-film capacitive sensor. The time required for the sensor to reach equilibrium was found to increase exponentially with decreasing sensor temperature, exceeding 2 min for T = –30 °C; however, the water vapor sensitivity of the device remained high down to this temperature. After calibrating our measurement procedure, we found residual scatter in the data corresponding to an uncertainty in the absolute water vapor pressure of about ±15%. This scatter was due mainly to long-term drift, which appeared to be intrinsic to the capacitive thin-film sensor. The origin of this drift is not clear, but it effectively limits the applicability of this instrument for absolute measurements. We also found, however, that the high sensitivity of the thin-film sensor makes it rather well suited for differential measurements. By comparing supersaturated and saturated air at the same temperature we obtained a relative measurement uncertainty of about ±1.5%, an order of magnitude better than the absolute measurements
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