5,794 research outputs found
Analytical continuation from imaginary to real chemical potential in 2-color QCD under scrutiny
The method of analytical continuation from imaginary to real chemical
potential is tested in 2-color QCD. In comparison to previous studies in the
same theory, an exact updating algorithm is used and simulations are performed
closer to the thermodynamic limit. It is shown that the method considerably
improves if suitable functions are used to interpolate data with imaginary
chemical potential.Comment: 7 pages, 5 figures, Lattice 2006 (High Temperature and Density
The critical line of QCD with four degenerate quarks
We determine the pseudo-critical couplings at imaginary chemical potentials
by high-statistics Monte Carlo simulations of QCD with four degenerate quarks
at non-zero temperature and baryon density by the method of analytic
continuationan. We reveal deviations from the simple quadratic dependence on
the chemical potential visible in earlier works on the same subject. Finally,
we discuss the implications of our findings for the shape of the
pseudo-critical line at real chemical potential, comparing different possible
extrapolations.Comment: 7 pages, 7 figures, talk presented at the XXVIII International
Symposium on Lattice Field Theory, June 14-19, 2010, Villasimius, Sardinia,
Ital
Analytic model of Regge trajectories
A model for a Regge trajectory compatible with the threshold behavior
required by unitarity and asymptotics in agreement with analyticity constraints
is given in explicit form. The model is confronted in the time-like region with
widths and masses of the mesonic resonances and, in the space-like region, the
trajectory is compared with predictions derived from
charge-exchange reaction. Breaking of the exchange degeneracy is studied in the
model and its effect on both the masses and widths is determined.Comment: 17 pages, 3 figure
Phase diagram of QCD with two degenerate staggered quarks
We present preliminary results about the critical line of QCD with two
degenerate staggered quarks at nonzero temperature and chemical potential,
obtained by the method of analytic continuation. As in our previous studies
with different numbers of colors and flavors, we find deviations from a simple
quadratic dependence on the chemical potential. We comment on the shape of the
critical line at real chemical potential and give an estimate of the curvature
of the critical line, both for quark chemical potential and isospin chemical
potential.Comment: 7 pages, 6 figures, talk presented at Lattice 2011, The XXIX
International Symposium on Lattice Field Theory, Squaw Valley, Lake Tahoe,
California, USA, July 11-16, 201
The critical line of two-flavor QCD at finite isospin or baryon densities from imaginary chemical potentials
We determine the (pseudo)critical lines of QCD with two degenerate staggered
fermions at nonzero temperature and quark or isospin density, in the region of
imaginary chemical potentials; analytic continuation is then used to prolongate
to the region of real chemical potentials. We obtain an accurate determination
of the curvatures at zero chemical potential, quantifying the deviation between
the case of finite quark and of finite isospin chemical potential. Deviations
from a quadratic dependence of the pseudocritical lines on the chemical
potential are clearly seen in both cases: we try different extrapolations and,
for the case of nonzero isospin chemical potential, confront them with the
results of direct Monte Carlo simulations. Finally we find that, as for the
finite quark density case, an imaginary isospin chemical potential can
strengthen the transition till turning it into strong first order.Comment: 11 pages, 11 figures, 4 table
Revealing the Resistant Capital of Cambodian Youth: Using Photovoice as a Tool for Advocacy and Policy Change
This paper explores the use of Photovoice as a tool for uncovering or developing resistant capital (Yosso, 2005) with youth for language education policy change. Using data from a Youth Participatory Action Research (YPAR) study on the relationships and tensions among the home, community, and school linguistic and social practices of emergent bilingual Cambodian youth in an urban district in the northeastern U.S., I argue that the development of resistant capital depends on various contextual and demographic factors. The Cambodian youth, who have been educated in a recursive bilingual environment (García, 2009) and are involved in a youth-led community organization with a social justice focus demonstrate resistant capital, which was likely fortified through their work there. Suggestions are made for using Photovoice in schools to develop resistant capital for policy change with language-minoritized youth
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