16,922 research outputs found
Characterization and analysis of azimuthally sensitive correlations
A unified framework for describing the azimuthal dependence of two-particle
correlations in heavy-ion collisions is introduced, together with the methods
for measuring the corresponding observables. The generalization to azimuthal
correlations between more than two particles is presented.Comment: 7 pages; talk given at Hot Quarks 2004, Taos (NM), July 18-24,200
Predictors of discordance among Chilean families
Parent-youth agreement on parental behaviors can characterize effective parenting. Although
discordance in families may be developmentally salient and harmful to youth outcomes, predictors
of discordance have been understudied, and existing research in this field has been mostly limited
to North American samples. This paper addressed this literature gap by using data from a
community-based study of Chilean adolescents. Analysis was based on 1,068 adolescents in
Santiago, Chile. The dependent variable was discordance which was measured by the difference
between parent and youth’s assessment of parental monitoring. Major independent variables for
this study were selected based on previous research findings that underscore youth’s
developmental factors, positive parental and familial factors and demographic factors. Descriptive
and multivariate analyses were conducted to examine the prevalence and associations between
youth, parental and familial measures with parent-youth discordance. There was a sizable level of
discordance between parent and youth’s report of parental monitoring. Youth’s gender and
externalizing behavior were significant predictors of discordance. Warm parenting and family
involvement were met with decreases in discordance. The negative interaction coefficients
between parental warmth and youth’s gender indicated that positive parental and familial
measures have a greater effect on reducing parent-youth discordance among male youths. Results
support the significance of positive family interactions in healthy family dynamics. Findings from
this study inform the importance of services and interventions for families that aim to reduce
youth’s problem behavior and to create a warm and interactive family environment.https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4181713/Accepted manuscrip
Numerical Replica Limit for the Density Correlation of the Random Dirac Fermion
The zero mode wave function of a massless Dirac fermion in the presence of a
random gauge field is studied. The density correlation function is calculated
numerically and found to exhibit power law in the weak randomness with the
disorder dependent exponent. It deviates from the power law and the disorder
dependence becomes frozen in the strong randomness. A classical statistical
system is employed through the replica trick to interpret the results and the
direct evaluation of the replica limit is demonstrated numerically. The
analytic expression of the correlation function and the free energy are also
discussed with the replica symmetry breaking and the Liouville field theory.Comment: 5 pages, 4 figures, REVTe
Probing spin fractionalization with ESR-STM absolute magnetometry
The emergence of effective spins at the edges of Haldane spin
chains is one of the simplest examples of fractionalization. Whereas there is
indirect evidence of this phenomenon, direct measurement of the magnetic moment
of an individual edge spin remains to be done. Here we show how scanning tunnel
microscopy electron-spin resonance (ESR-STM) can be used to map the stray field
created by the fractional edge spin and we propose efficient methods to
invert the Biot-Savart equation, obtaining the edge magnetization map. This
permits one to determine unambiguously the two outstanding emergent properties
of fractional degrees of freedom, namely, their fractional magnetic moment and
their localization length
Cavity approach for real variables on diluted graphs and application to synchronization in small-world lattices
We study XY spin systems on small world lattices for a variety of graph
structures, e.g. Poisson and scale-free, superimposed upon a one dimensional
chain. In order to solve this model we extend the cavity method in the one
pure-state approximation to deal with real-valued dynamical variables. We find
that small-world architectures significantly enlarge the region in parameter
space where synchronization occurs. We contrast the results of population
dynamics performed on a truncated set of cavity fields with Monte Carlo
simulations and find excellent agreement. Further, we investigate the
appearance of replica symmetry breaking in the spin-glass phase by numerically
analyzing the proliferation of pure states in the message passing equations.Comment: 10 pages, 3 figure
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