659 research outputs found
Finite-size analysis of the Fermi liquid properties of the homogeneous electron gas
We analyze the extrapolation to the thermodynamic limit of Fermi liquid
properties of the homogeneous electron gas in two and three dimensions. Using
field theory, we explicitly calculate finite-size effects of the total energy,
the renormalization factor, and the effective mass at the Fermi surface within
the random phase approximation (RPA) and discuss the validity for general
metallic systems.Comment: 6 page
Renormalization factor and effective mass of the two-dimensional electron gas
We calculate the momentum distribution of the Fermi liquid phase of the
homogeneous, two-dimensional electron gas. We show that, close to the Fermi
surface, the momentum distribution of a finite system with electrons
approaches its thermodynamic limit slowly, with leading order corrections
scaling as . These corrections dominate the extrapolation of the
renormalization factor, , and the single particle effective mass, , to
the infinite system size. We show how convergence can be improved analytically.
In the range , we get a lower renormalization factor and
a higher effective mass, , compared to the perturbative RPA values.Comment: 4 pages, 3 figure
Molecular-Atomic Transition in the Deuterium Hugoniot with Coupled Electron Ion Monte Carlo
We have performed accurate simulations of the Deuterium Hugoniot using
Coupled Electron Ion Monte Carlo (CEIMC). Using highly accurate quantum Monte
Carlo methods for the electrons, we study the region of maximum compression
along the principal Hugoniot, where the system undergoes a continuous
transition from a molecular fluid to a monatomic fluid. We include all relevant
physical corrections so that a direct comparison to experiment can be made.
Around 50 GPa we found a maximum compression of 4.85, roughly 10% larger than
previous theoretical predictions and experimental data but still compatible
with the latter because of their large uncertainty.Comment: 7 pages, 3 figure
Blood markers of alcohol use in epistaxis patients
Epistaxis and alcohol overconsumption are frequently encountered in patients admitted to emergency wards. The aim of the study was to analyze indirect markers of alcohol overconsumption in epistaxis patients and evaluate its role as a risk factor. In a cohort of 510 epistaxis patients indirect markers of alcohol overuse were measured including the mean corpuscular volume (MCV), gamma glutamyltransferase (GGT), aspartate aminotransferase and alanine aminotransferase. The results were compared to the normal findings in literature. Pathologic mean levels of GGT were found in epistaxis patients. Almost 5% had macrocytosis and MCV correlated positively with liver enzyme levels. Platelet counts were negatively correlated with both corpuscular volumes and liver enzymes. Indirect markers of alcohol overconsumption were found to be elevated in epistaxis patients. These results suggest that a subgroup of epistaxis patients overconsumes alcoholic beverages supporting the idea of alcohol abuse being a risk factor in epistaxis. Questioning about drinking habits should be employed and help offered to affected patient
PHENIX and the Reaction Plane: Recent Results
During the past several years, experiments at RHIC have established that a
dense partonic medium is produced in Au+Au collisions at sqrt(s)=200 GeV.
Subsequently, a primary goal of analysis has been to understand and
characterize the dynamics underlying this new form of matter. Among the many
probes available, the measurements with respect to the reaction plane has
proven to be crucial to our understanding of a wide range of topics, from the
hydrodynamics of the initial expansion of the collision region to high-pt jet
quenching phenomena. Few tools have the ability to shed light on such a wide
variety of observables as the reacion plane. In this article, we discuss recent
PHENIX measurements with respect to the reaction plane, and the implications
for understanding the underlying physics of RHIC collisions.Comment: 9 pages, 13 figures, Submitted for proceedings to the Winter Workshop
on Nuclear Dynamics 2010, Ocho Rios, Jamaic
- …