659 research outputs found
A note on the infrared behavior of the compactified Ginzburg--Landau model in a magnetic field
We consider the Euclidean large- Ginzburg--Landau model in dimensions,
() of them being compactified. For D=3, the system can be supposed
to describe, in the cases of d=1, d=2, and d=3, respectively, a superconducting
material in the form of a film, of an infinitely long wire having a rectangular
cross-section and of a brick-shaped grain. We investigate the fixed-point
structure of the model, in the presence of an external magnetic field. An
infrared-stable fixed points is found, which is independent of the number of
compactified dimensions. This generalizes previous work for type-II
superconducting filmsComment: LATEX, 6 pages no figures. arXiv admin note: 80% of text overlaps
with arXiv:1102.139
Addendum: Behavior of a bipartite system in a cavity
This note is an Addendum to our previous article [Phys. Rev. A \textbf{81},
053820 (2010)]. We show that under the assumption of a Bose-Einstein
distribution for the thermal reservoir, zero-temperature properties of the
entangled states considered there are not changed by heating, for temperatures
up to the order of room temperatures. In this case, the system is dissipative
in free space and presents stability for a small cavity, both for T=0 and for
finite temperature.Comment: Revtex, 04 pages no figures, Version as accepted for publication in
Phys. Rev.
Magnetic effects on spontaneous symmetry breaking/restoration in a toroidal topology
We study temperature and finite-size effects on the spontaneous symmetry
breaking/restoration for a scalar field model under the influence of an
external magnetic field, at finite chemical potential. We use the 2PI formalism
and consider the large- limit. We find that there is a minimal size of the
system to sustain the broken phase, which diminishes as the applied field
increases but is independent of the chemical potential. We analyze the critical
curves and show that the magnetic field enhances the broken-phase regions,
while increasing the chemical potential leads to a diminishement of the
critical temperature.Comment: Five pages, five figures, version as accepted for publication in
Phys. Rev.
Behavior of a bipartite system in a cavity
We study the time evolution of a superposition of product states of two
dressed atoms in a spherical cavity in the situations of an arbitrarily large
cavity (free space) and of a small one. In the large-cavity case, the system
dissipates, whereas, for the small cavity, the system evolves in an oscillating
way and never completely decays. We verify that the von Neumann entropy for
such a system does not depend on time, nor on the size of the cavityComment: 9 pages 2 figures, Revtex, Version accepted to be published in
Physical Review
Effect of age and anatomic site on likelihood of detecting S. aureus in pigs
Intensive sampling of two swine farms in Minnesota was conducted to obtain basic information about the ecology and epidemiology of S. aureus in modern multiple site swine production. The farms were selected by convenience, and two cohorts of animals were sampled in each system
Longitudinal study of Staphylococcus aureus and MRSA colonization of US swine veterinarians
Patterns of detection of S. aureus are being evaluated in a longitudinal study of a cohort of 67 swine veterinarians in the USA. This report presents interim data from the initial period of the study. Overall, approximately 70% of sampling events yielded S. aureus in nasal swabs from veterinarians, and 8% yielded MRSA isolates
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