22,656 research outputs found
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
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
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
Electron-positron annihilation into Dirac magnetic monopole and antimonopole: the string ambiguity and the discrete symmetries
We address the problem of string arbitrariness in the quantum field theory of
Dirac magnetic monopoles. Different prescriptions are shown to yield different
physical results. The constraints due to the discrete symmetries (C and P) are
derived for the process of electron- positron annihilation into the
monopole-antimonopole pair. In the case of the annihilation through the
one-photon channel, the production of spin 0 monopoles is absolutely forbidden;
spin 1/2 monopole and antimonopole should have the same helicities (or,
equivalently, the monopole-antimonopole state should be p-wave ).Comment: 14 pages, revtex, 3 figure
Finite Temperature Behavior of Small Silicon and Tin Clusters: An Ab Initio Molecular Dynamics Study
The finite temperature behavior of small Silicon (Si, Si, and
Si) and Tin (Sn and Sn) clusters is studied using
isokinetic Born-Oppenheimer molecular dynamics. The lowest equilibrium
structures of all the clusters are built upon a highly stable tricapped
trigonal prism unit which is seen to play a crucial role in the finite
temperature behavior of these clusters. Thermodynamics of small tin clusters
(Sn and Sn) is revisited in light of the recent experiments on
tin clusters of sizes 18-21 [G. A. Breaux et. al. Phys. Rev. B {\bf 71} 073410
(2005)]. We have calculated heat capacities using multiple histogram technique
for Si, Sn and Si clusters. Our calculated specific heat
curves have a main peak around 2300 K and 2200 K for Si and Sn
clusters respectively. However, various other melting indicators such as root
mean square bond length fluctuations, mean square displacements show that
diffusive motion of atoms within the cluster begins around 650 K. The finite
temperature behavior of Si and Sn is dominated by isomerization
and it is rather difficult to discern the temperature range for transition
region. On the other hand, Si does show a liquid like behavior over a
short temperature range followed by the fragmentation observed around 1800 K.
Finite temperature behavior of Si and Sn show that these clusters
do not melt but fragment around 1200 K and 650 K respectively.Comment: 9 figure
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