41 research outputs found
Behavior of Fermi Systems Approaching Fermion Condensation Quantum Phase Transition from Disordered Phase
The behavior of Fermi systems which approach the fermion condensation quantum
phase transition (FCQPT) from the disordered phase is considered. We show that
the quasiparticle effective mass diverges as
where is the system density and is the critical point at which
FCQPT occurs. Such a behavior is of general form and takes place in both three
dimensional (3D) systems and two dimensional (2D) ones. Since the effective
mass is finite, the system exhibits the Landau Fermi liquid behavior. At
, the behavior can be viewed as a highly correlated
one, because the effective mass is large and strongly depends on the density.
In case of electronic systems the Wiedemann-Franz law is held and
Kadowaki-Woods ratio is preserved. Beyond the region ,
the effective mass is approximately constant and the system becomes
conventional Landau Fermi liquid.Comment: 9 pages, revtex, no figure
AEGIS at CERN: Measuring Antihydrogen Fall
The main goal of the AEGIS experiment at the CERN Antiproton Decelerator is
the test of fundamental laws such as the Weak Equivalence Principle (WEP) and
CPT symmetry. In the first phase of AEGIS, a beam of antihydrogen will be
formed whose fall in the gravitational field is measured in a Moire'
deflectometer; this will constitute the first test of the WEP with antimatter.Comment: Presented at the Fifth Meeting on CPT and Lorentz Symmetry,
Bloomington, Indiana, June 28-July 2, 201
Adaptation of the Landau-Migdal Quasiparticle Pattern to Strongly Correlated Fermi Systems
A quasiparticle pattern advanced in Landau's first article on Fermi liquid
theory is adapted to elucidate the properties of a class of strongly correlated
Fermi systems characterized by a Lifshitz phase diagram featuring a quantum
critical point (QCP) where the density of states diverges. The necessary
condition for stability of the Landau Fermi Liquid state is shown to break down
in such systems, triggering a cascade of topological phase transitions that
lead, without symmetry violation, to states with multi-connected Fermi
surfaces. The end point of this evolution is found to be an exceptional state
whose spectrum of single-particle excitations exhibits a completely flat
portion at zero temperature. Analysis of the evolution of the temperature
dependence of the single-particle spectrum yields results that provide a
natural explanation of classical behavior of this class of Fermi systems in the
QCP region.Comment: 26 pages, 14 figures. Dedicated to 100th anniversary of A.B.Migdal
birthda
Topological crossovers near a quantum critical point
We study the temperature evolution of the single-particle spectrum
and quasiparticle momentum distribution of homogeneous
strongly correlated Fermi systems beyond a point where the necessary condition
for stability of the Landau state is violated, and the Fermi surface becomes
multi-connected by virtue of a topological crossover. Attention is focused on
the different non-Fermi-liquid temperature regimes experienced by a phase
exhibiting a single additional hole pocket compared with the conventional
Landau state. A critical experiment is proposed to elucidate the origin of NFL
behavior in dense films of liquid He.Comment: 7 pages, 6 figure
Blooming Artifact Reduction in Coronary Artery Calcification by A New De-blooming Algorithm: Initial Study
The aim of this study was to investigate the use of de-blooming algorithm in coronary CT angiography (CCTA) for optimal evaluation of calcified plaques. Calcified plaques were simulated on a coronary vessel phantom and a cardiac motion phantom. Two convolution kernels, standard (STND) and high-definition standard (HD STND), were used for imaging reconstruction. A dedicated de-blooming algorithm was used for imaging processing. We found a smaller bias towards measurement of stenosis using the deblooming algorithm (STND: bias 24.6% vs 15.0%, range 10.2% to 39.0% vs 4.0% to 25.9%; HD STND: bias 17.9% vs 11.0%, range 8.9% to 30.6% vs 0.5% to 21.5%). With use of de-blooming algorithm, specificity for diagnosing significant stenosis increased from 45.8% to 75.0% (STND), from 62.5% to 83.3% (HD STND); while positive predictive value (PPV) increased from 69.8% to 83.3% (STND), from 76.9% to 88.2% (HD STND). In the patient group, reduction in calcification volume was 48.1 ± 10.3%, reduction in coronary diameter stenosis over calcified plaque was 52.4 ± 24.2%. Our results suggest that the novel de-blooming algorithm could effectively decrease the blooming artifacts caused by coronary calcified plaques, and consequently improve diagnostic accuracy of CCTA in assessing coronary stenosis
REFORMA E DESAFIOS DA EDUCAÇÃO SUPERIOR: O PROCESSO DE BOLONHA DEZ ANOS DEPOIS
Este artigo trata da implementação do Processo de Bolonha iniciado em 1998. Tal processo consiste em uma ampla reforma da educação superior na Europa. Após se examinar a trajetória de consolidação dos objetivos e as metas desse programa, é focalizada, privilegiadamente, a situação atual do ensino superior na Alemanha. São abordados três aspectos centrais: o processo de formulação de uma reforma de proporções continentais por meio das conferências e dos comunicados; as mudanças introduzidas na organização do ensino superior; e, por fim, a análise do processo de adoção do modelo Bolonha no sistema de ensino superior na Alemanha e os problemas e desafios dez anos depois