2,857 research outputs found
Tourette Syndrome Research Highlights from 2017 [version 1; referees: 3 approved]
This is the fourth yearly article in the Tourette Syndrome Research Highlights series, summarizing research from 2017 relevant to Tourette syndrome and other tic disorders. The authors briefly summarize reports they consider most important or interesting. The highlights from 2018 article is being drafted on the Authorea online authoring platform, and readers are encouraged to add references or give feedback on our selections using the comments feature on that page. After the calendar year ends, the article is submitted as the annual update for the Tics collection on F1000Research
Tourette syndrome research highlights from 2019
This is the sixth yearly article in the Tourette Syndrome Research Highlights series, summarizing research from 2019 relevant to Tourette syndrome and other tic disorders. The highlights from 2020 is being drafted on the Authorea online authoring platform; readers are encouraged to add references or give feedback on our selections comments feature on this page. After the calendar year ends, this article is submitted as the annual update for the Tics collection F1000Research
Benchmarking a semiclassical impurity solver for dynamical-mean-field theory: self-energies and magnetic transitions of the single-orbital Hubbard model
An investigation is presented of the utility of semiclassical approximations
for solving the quantum-impurity problems arising in the dynamical-mean-field
approach to the correlated-electron models. The method is based on performing a
exact numerical integral over the zero-Matsubara-frequency component of the
spin part of a continuous Hubbard-Stratonovich field, along with a
spin-field-dependent steepest descents treatment of the charge part. We test
this method by applying it to one or two site approximations to the single band
Hubbard model with different band structures, and comparing the results to
quantum Monte-Carlo and simplified exact diagonalization calculations. The
resulting electron self-energies, densities of states and magnetic transition
temperatures show reasonable agreement with the quantum Monte-Carlo simulation
over wide parameter ranges, suggesting that the semiclassical method is useful
for obtaining a reasonable picture of the physics in situations where other
techniques are too expensive.Comment: 14 pages, 15 figure
Interpolation and harmonic majorants in big Hardy-Orlicz spaces
Free interpolation in Hardy spaces is caracterized by the well-known Carleson
condition. The result extends to Hardy-Orlicz spaces contained in the scale of
classical Hardy spaces , . For the Smirnov and the Nevanlinna
classes, interpolating sequences have been characterized in a recent paper in
terms of the existence of harmonic majorants (quasi-bounded in the case of the
Smirnov class). Since the Smirnov class can be regarded as the union over all
Hardy-Orlicz spaces associated with a so-called strongly convex function, it is
natural to ask how the condition changes from the Carleson condition in
classical Hardy spaces to harmonic majorants in the Smirnov class. The aim of
this paper is to narrow down this gap from the Smirnov class to ``big''
Hardy-Orlicz spaces. More precisely, we characterize interpolating sequences
for a class of Hardy-Orlicz spaces that carry an algebraic structure and that
are strictly bigger than . It turns out that the
interpolating sequences are again characterized by the existence of
quasi-bounded majorants, but now the weights of the majorants have to be in
suitable Orlicz spaces. The existence of harmonic majorants in such Orlicz
spaces will also be discussed in the general situation. We finish the paper
with an example of a separated Blaschke sequence that is interpolating for
certain Hardy-Orlicz spaces without being interpolating for slightly smaller
ones.Comment: 19 pages, 2 figure
Interpolation in the Nevanlinna and Smirnov classes and harmonic majorants
31 pagesInternational audienceWe consider a free interpolation problem in Nevanlinna and Smirnov classes and find a characterization of the corresponding interpolating sequences in terms of the existence of harmonic majorants of certain functions. We also consider the related problem of characterizing positive functions in the disk having a harmonic majorant. An answer is given in terms of a dual relation which involves positive measures in the disk with bounded Poisson balayage. We deduce necessary and sufficient geometric conditions, both expressed in terms of certain maximal functions
Cooling, Gravity and Geometry: Flow-driven Massive Core Formation
We study numerically the formation of molecular clouds in large-scale
colliding flows including self-gravity. The models emphasize the competition
between the effects of gravity on global and local scales in an isolated cloud.
Global gravity builds up large-scale filaments, while local gravity --
triggered by a combination of strong thermal and dynamical instabilities --
causes cores to form. The dynamical instabilities give rise to a local focusing
of the colliding flows, facilitating the rapid formation of massive
protostellar cores of a few 100 M. The forming clouds do not reach an
equilibrium state, though the motions within the clouds appear comparable to
``virial''. The self-similar core mass distributions derived from models with
and without self-gravity indicate that the core mass distribution is set very
early on during the cloud formation process, predominantly by a combination of
thermal and dynamical instabilities rather than by self-gravity.Comment: 13 pages, 12 figures, accepted by Ap
Superconducting quantum simulator for topological order and the toric code
Topological order is now being established as a central criterion for
characterizing and classifying ground states of condensed matter systems and
complements categorizations based on symmetries. Fractional quantum Hall
systems and quantum spin liquids are receiving substantial interest because of
their intriguing quantum correlations, their exotic excitations and prospects
for protecting stored quantum information against errors. Here we show that the
Hamiltonian of the central model of this class of systems, the Toric Code, can
be directly implemented as an analog quantum simulator in lattices of
superconducting circuits. The four-body interactions, which lie at its heart,
are in our concept realized via Superconducting Quantum Interference Devices
(SQUIDs) that are driven by a suitably oscillating flux bias. All physical
qubits and coupling SQUIDs can be individually controlled with high precision.
Topologically ordered states can be prepared via an adiabatic ramp of the
stabilizer interactions. Strings of qubit operators, including the stabilizers
and correlations along non-contractible loops, can be read out via a capacitive
coupling to read-out resonators. Moreover, the available single qubit
operations allow to create and propagate elementary excitations of the Toric
Code and to verify their fractional statistics. The architecture we propose
allows to implement a large variety of many-body interactions and thus provides
a versatile analog quantum simulator for topological order and lattice gauge
theories
European clinical guidelines for Tourette syndrome and other tic disorders:summary statement
In 2011 a working group of the European Society for the Study of Tourette syndrome (ESSTS) developed the first European Guidelines for Tourette syndrome (TS) published in the ECAP journal. After a decade ESSTS now presents updated guidelines, divided into four sections: Part I: assessment, Part II: psychological interventions, Part III: pharmacological treatment and Part IV: deep brain stimulation (DBS). In this paper, we summarise new developments described in the guidelines with respect to assessment and treatment of tics. Further, summary findings from a recent survey conducted amongst TS experts on these same topics are presented, as well as the first European patient representative statement on research. Finally, an updated decision tree is introduced providing a practical algorithm for the treatment of patients with TS. Interestingly, in the last decade there has been a significant shift in assessment and treatment of tics, with more emphasis on non-pharmacological treatments
Quantum spin chains of Temperley-Lieb type: periodic boundary conditions, spectral multiplicities and finite temperature
We determine the spectra of a class of quantum spin chains of Temperley-Lieb
type by utilizing the concept of Temperley-Lieb equivalence with the S=1/2 XXZ
chain as a reference system. We consider open boundary conditions and in
particular periodic boundary conditions. For both types of boundaries the
identification with XXZ spectra is performed within isomorphic representations
of the underlying Temperley-Lieb algebra. For open boundaries the spectra of
these models differ from the spectrum of the associated XXZ chain only in the
multiplicities of the eigenvalues. The periodic case is rather different. Here
we show how the spectrum is obtained sector-wise from the spectra of globally
twisted XXZ chains. As a spin-off, we obtain a compact formula for the
degeneracy of the momentum operator eigenvalues. Our representation theoretical
results allow for the study of the thermodynamics by establishing a
TL-equivalence at finite temperature and finite field.Comment: 29 pages, LaTeX, two references added, redundant figures remove
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