10,643 research outputs found
Chromomagnetic Instability and Induced Magnetic Field in Neutral Two-Flavor Color Superconductivity
We find that the chromomagnetic instability existing in neutral two- flavor
color superconductivity at moderate densities is removed by the formation of an
inhomogeneous condensate of charged gluons and the corresponding induction of a
magnetic field. It is shown that this inhomogeneous ground state is
energetically favored over a homogeneous one. The spontaneous induction of a
magnetic field in a color superconductor at moderate densities can be of
interest for the astrophysics of compact stellar objects exhibiting strong
magnetic fields as magnetars.Comment: Version to appear in PR
Dynamically Induced Zeeman Effect in Massless QED
It is shown that in non-perturbative massless QED an anomalous magnetic
moment is dynamically induced by an applied magnetic field. The induced
magnetic moment produces a Zeeman splitting for electrons in Landau levels
higher than . The expressions for the non-perturbative Lande g-factor and
Bohr magneton are obtained. Possible applications of this effect are outlined.Comment: Extensively revised version with several misprints and formulas
corrected. In this new version we included the non-perturbative Lande
g-factor and Bohr magneto
Non-equilibrium transport response from equilibrium transport theory
We propose a simple scheme that describes accurately essential
non-equilibrium effects in nanoscale electronics devices using equilibrium
transport theory. The scheme, which is based on the alignment and dealignment
of the junction molecular orbitals with the shifted Fermi levels of the
electrodes, simplifies drastically the calculation of current-voltage
characteristics compared to typical non-equilibrium algorithms. We probe that
the scheme captures a number of non-trivial transport phenomena such as the
negative differential resistance and rectification effects. It applies to those
atomic-scale junctions whose relevant states for transport are spatially placed
on the contact atoms or near the electrodes.Comment: 5 pages, 4 figures. Accepted in Physical Review
Interpolation sets in spaces of continuous metric-valued functions
Let and be a topological space and metric space, respectively. If
denotes the set of all continuous functions from X to M, we say that a
subset of is an \emph{-interpolation set} if given any function
with relatively compact range in , there exists a map such that . In this paper, motivated by a result of Bourgain
in \cite{Bourgain1977}, we introduce a property, stronger than the mere
\emph{non equicontinuity} of a family of continuous functions, that isolates a
crucial fact for the existence of interpolation sets in fairly general
settings. As a consequence, we establish the existence of sets in every
nonprecompact subset of a abelian locally -groups. This implies
that abelian locally -groups strongly respects compactness
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