109 research outputs found
Bulk Properties of a Fermi Gas in a Magnetic Field
We calculate the number density, energy density, transverse pressure, longitudinal pressure and magnetization of an ensemble of spin one-half particles in the presence of a homogeneous background magnetic field. The magnetic field direction breaks spherical symmetry causing the pressure parallel to it. We present explicit formulae appropriate at zero and finite temperature for both charged and uncharged particles including the effect of the anomalous magnetic moment. We demonstrate that the resulting expressions satisfy the canonical relations, omega = -PII and Pperpendicular = PII- MB with M = (delta)(omega)/(delta)(beta) being the magnetization of the system. We numerically calculate the resulting pressure anisotropy for a gas of protons and a gas of neutrons and demonstrate that the inclusion of the anomalous magnetic increase the level of pressure anisotropy in both cases
The importance of the mixed phase in hybrid stars built with the Nambu-Jona-Lasinio model
We investigate the structure of hybrid stars based on two different
constructions: one is based on the Gibbs condition for phase coexistence and
considers the existence of a mixed phase (MP), and the other is based on the
Maxwell construction and no mixed phase is obtained. The hadron phase is
described by the non-linear Walecka model (NLW) and the quark phase by the
Nambu-Jona-Lasinio model (NJL). We conclude that the masses and radii obtained
are model dependent but not significantly different for both constructions.Comment: 8 pages, 7 figures, 3 table
Relativistic Thomas-Fermi description of Sm isotopes at finite temperature
The caloric curve (excitation energy per particle as a function of
temperature) for finite nuclei is calculated within the non-linear Walecka
model for different proton fractions and different parameterizations. The
results obtained are compared with published experimental data and other
theoretical results. Other properties related with the droplet formation as the
surface energy, neutron skin thickness and binding energy per nucleon are also
displayed as a function of temperature and their behaviours are discussed. It
is shown that the caloric curve is sensitive to the proton fraction and to the
Coulomb interaction. At T=0 the droplet properties do not depend on the
parameterization used. At finite temperature however, the sensitivity appears.Comment: 24 pages, 5 figures, 9 table
Droplet formation in cold asymmetric nuclear matter in the quark-meson-coupling model
The quark-meson-coupling model is used to study droplet formation from the
liquid-gas phase transition in cold asymmetric nuclear matter. The critical
density and proton fraction for the phase transition are determined in the mean
field approximation. Droplet properties are calculated in the Thomas-Fermi
approximation. The electromagnetic field is explicitly included and its effects
on droplet properties are studied. The results are compared with the ones
obtained with the NL1 parametrization of the non-linear Walecka model.Comment: 21 pages, RevTeX including 8 figures in .eps file
Quons as su(2) Irreducible Tensor Operators
We prove that, for the quon algebra, which interpolates between the Bose and
Fermi statistics and depends on a free parameter q,it is possible to build an
su(2) irreducible representation. One of the consequences of this fact is that
the quons couple via the same angular momentum coupling rules obeyed by
ordinary bosons and fermions.Comment: 8 pages,Late
Relativistic Mean Field Approximation in a Density Dependent Parametrization Model at Finite Temperature
In this work we calculate the equation of state of nuclear matter for
different proton fractions at zero and finite temperature within the Thomas
Fermi approach considering three different parameter sets: the well-known NL3
and TM1 and a density dependent parametrization proposed by Typel and Wolter.
The main differences are outlined and the consequences of imposing
beta-stability in these models are discussed.Comment: 13 pages, 10 figure
Quons Restricted to the Antisymmetric Subspace: Formalism and Applications
In this work we develop a formalism to treat quons restricted to the
antisymmetric part of their many-body space. A model in which a system of
identical quons interact through a pairing force is then solved within this
restriction and the differences between our solution and the usual fermionic
model solution are then presented and discussed in detail. Possible connections
to physical systems are also considered.Comment: 12 pages, 3 figure
Hadron production in non linear relativistic mean field models
By using a parametrization of the non-linear Walecka model which takes into
account the binding energy of different hyperons, we present a study of
particle production yields measured in central Au-Au collision at RHIC. Two
sets of different hyperon-meson coupling constants are employed in obtaining
the hadron production and chemical freeze-out parameters. These quantities show
a weak dependence on the used hyperon-meson couplings. Results are in good
overall accordance with experimental data. We have found that the repulsion
among the baryons is quite small and, through a preliminary analysis of the
effective mesonic masses, we suggest a way to improve the fittings.Comment: 18 pages, 2 figure
Distribution of Glycated Haemoglobin According to Early-Life and Contemporary Characteristics in Adolescents and Adults without Diabetes:The 1982 and 1993 Pelotas Birth Cohorts
AIM:Glycated haemoglobin (HbA1c), a marker of glucose control in individuals with diabetes mellitus, is also related with the incidence of cardiometabolic risk in populations free of disease. The aim of this study was to describe the distribution of HbA1c levels according to early-life and contemporary factors in adolescents and adults without diabetes mellitus. METHODS:HbA1c was measured in adults aged 30 years and adolescents aged 18 years who are participants in the 1982 and 1993 Pelotas Birth Cohorts, respectively. Bivariate and multivariate analyses were performed to describe the HbA1c mean values according to early-life and contemporary characteristics collected prospectively since birth. RESULTS:The distribution of the HbA1c was approximately normal in both cohorts, with a mean (SD) 5.10% (0.43) in the 1982 cohort, and 4.89% (0.50) in the 1993 cohort. HbA1c mean levels were significantly higher in individuals self-reported as black/brown skin color compared to those self-reported as white in both cohorts. Parental history of diabetes was associated with higher HbA1c mean in adults, while stunting at one year old presented an inverse relation with the outcome in adolescents. No other early and contemporary factors were associated with HbA1c levels in adults or adolescents. CONCLUSIONS:We found a consistent relationship between HbA1c and skin color in both cohorts. Further research is needed to understand the role of genomic ancestry on levels of HbA1c concentrations which may inform policies and preventive actions for diabetes mellitus and cardiometabolic risk
Neutrino mean free paths in spin-polarized neutron Fermi liquids
Neutrino mean free paths in magnetized neutron matter are calculated using
the Hartree-Fock approximation with effective Skyrme and Gogny forces in the
framework of the Landau Fermi Liquid Theory. It is shown that describing
nuclear interaction with Skyrme forces and for magnetic field strengths
, the neutrino mean free paths stay almost unchanged
at intermediate densities but they largely increase at high densities when they
are compared to the field-free case results. However the description with Gogny
forces differs from the previous and mean free paths stay almonst unchanged or
decrease at densities . This different behaviour can be explained
due to the combination of common mild variation of the Landau parameters with
both types of forces and the values of the nucleon effective mass and induced
magnetization of matter under presence of a strong magnetic field as described
with the two parametrizations of the nuclear interaction.Comment: 9 pages, 3 figure
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