120,671 research outputs found
Guiding-center Hall viscosity and intrinsic dipole moment along edges of incompressible fractional quantum Hall fluids
The discontinuity of guiding-center Hall viscosity (a bulk property) at edges
of incompressible quantum Hall fluids is associated with the presence of an
intrinsic electric dipole moment on the edge. If there is a gradient of drift
velocity due to a non-uniform electric field, the discontinuity in the induced
stress is exactly balanced by the electric force on the dipole. The total Hall
viscosity has two distinct contributions: a "trivial" contribution associated
with the geometry of the Landau orbits, and a non-trivial contribution
associated with guiding-center correlations.
We describe a relation between the guiding-center edge-dipole moment and
"momentum polarization", which relates the guiding-center part of the bulk Hall
viscosity to the "orbital entanglement spectrum(OES)". We observe that using
the computationally-more-onerous "real-space entanglement spectrum (RES)" just
adds the trivial Landau-orbit contribution to the guiding-center part. This
shows that all the non-trivial information is completely contained in the OES,
which also exposes a fundamental topological quantity = , the difference between the "chiral stress-energy anomaly" (or signed
conformal anomaly) and the chiral charge anomaly. This quantity characterizes
correlated fractional quantum Hall fluids, and vanishes in uncorrelated integer
quantum Hall fluids
Comments on "Entropy of 2D Black Holes from Counting Microstates"
In a recent letter, Cadoni and Mignemi proposed a formulation for the
statistical computation of the 2D black holes entropy. We present a criticism
about their formulation.Comment: 5 pages, Latex, no figure
Anomalous Pressure Dependence of Kadowaki-Woods ratio and Crystal Field Effects in Mixed-valence YbInCu4
The mixed-valence (MV) compound YbInCu4 was investigated by electrical
resistivity and ac specific heat at low temperatures and high pressures. At
atmospheric pressure, its Kadowaki-Woods (KW) ratio, A/\gamma ^2, is 16 times
smaller than the universal value R_{KW}(=1.0 x 10^-5 \mu \Omega cm mol^2 K^2
mJ^-2), but sharply increases to 16.5R_{KW} at 27 kbar. The pressure-induced
change in the KW ratio and deviation from R_{KW} are analyzed in terms of the
change in f-orbital degeneracy N and carrier density n. This analysis is
further supported by a dramatic change in residual resistivity \rho_0 near 25
kbar, where \rho_0 jumps by a factor of 7.Comment: 4pages, 3figure
Towards Efficient Full Pose Omnidirectionality with Overactuated MAVs
Omnidirectional MAVs are a growing field, with demonstrated advantages for
aerial interaction and uninhibited observation. While systems with complete
pose omnidirectionality and high hover efficiency have been developed
independently, a robust system that combines the two has not been demonstrated
to date. This paper presents VoliroX: a novel omnidirectional vehicle that can
exert a wrench in any orientation while maintaining efficient flight
configurations. The system design is presented, and a 6 DOF geometric control
that is robust to singularities. Flight experiments further demonstrate and
verify its capabilities.Comment: 10 pages, 6 figures, ISER 2018 conference submissio
Montessori Education and a Neighborhood School: A Case Study of Two Early Childhood Education Classrooms
Project SYNC (Systems, Yoked through Nuanced Collaboration) details perspectives of a community of stakeholders committed to the enhancement of early childhood (i.e., prekindergarten through grade 3) education. Although there is a growing number of public-school programs informed by the Montessori philosophy, Montessori educational experiences often take place within affluent communities. SYNC aimed to enhance the prekindergarten through grade 3 educational experiences for traditionally underserved students by transforming two traditional early childhood classrooms to Montessori settings within a diverse, Title I school. Montessori pedagogy, curricula, and materials aligned with the school’s dedicated commitment to social justice. The study, one in a series, explored the impact of Montessori education on a neighborhood school community as evidenced through stakeholder opinions, project implementation, and teacher attitudes. Project data illustrate that a Montessori educational experience created learning opportunities that supported children from culturally and ethnically diverse communities in a traditional, Title I elementary school
The Second Virial Coefficient of Spin-1/2 Interacting Anyon System
Evaluating the propagator by the usual time-sliced manner, we use it to
compute the second virial coefficient of an anyon gas interacting through the
repulsive potential of the form . All the cusps for the
unpolarized spin-1/2 as well as spinless cases disappear in the
limit, where is a frequency of harmonic oscillator which is introduced
as a regularization method. As approaches to zero, the result reduces to
the noninteracting hard-core limit.Comment: 9 pages, 2 figs include
The Solar pp and hep Processes in Effective Field Theory
The strategy of modern effective field theory is exploited to pin down
accurately the flux factors for the and processes in the Sun.
The technique used is to combine the high accuracy established in few-nucleon
systems of the "standard nuclear physics approach" (SNPA) and the systematic
power counting of chiral perturbation theory (ChPT) into a consistent effective
field theory framework. Using highly accurate wave functions obtained in the
SNPA and working to \nlo3 in the chiral counting for the current, we make
totally parameter-free and error-controlled predictions for the and
processes in the Sun.Comment: 5 pages, aipproc macros are included. Talk given at International
Nuclear Physics Conference 2001, Berkeley, California, July 30 - August 3,
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