Dissipation and elliptic flow at RHIC

We compare elliptic flow evolution from ideal hydrodynamics and covariant parton transport theory, and show that, for conditions expected at RHIC, dissipation significantly reduces elliptic flow even for extreme parton cross sections and/or densities sigma_gg * dN/d\eta(b=0) ~ 45 mb * 1000. The difference between transport and hydrodynamic elliptic flow is established rather early during the evolution of the system, but the buildup of elliptic flow is surprisingly insensitive to the choice of the initial (formation or thermalization) time in both models.Comment: 4 pages, 3 EPS fig

Preserving the measure of compatibility between quantum states

In this paper after defining the abstract concept of compatibility-like functions on quantum states, we prove that every bijective transformation on the set of all states which preserves such a function is implemented by an either unitary or antiunitary operator.Comment: 11 pages, submitted for publicatio

The right choice of moment for anisotropic fluid dynamics

We study anisotropic fluid dynamics derived from the Boltzmann equation based on a particular choice for the anisotropic distribution function within a boost-invariant expansion of the fluid in one spatial dimension. In order to close the conservation equations we need to choose an additional moment of the Boltzmann equation. We discuss the influence of this choice of closure on the time evolution of fluid-dynamical variables and search for the best agreement to the solution of the Boltzmann equation in the relaxation-time approximation.Comment: 4 pages, 4 figures, proceedings for Quark Matter 201

A kárpátaljai magyarok munkavállalói migrációja

The political and economic crisis of recent years has intensified the migrational activity from Ukraine to European countries with higher standards of living. Among the Transcarpathian Hungarians there are especially intensive migration processes for employment and other purposes, which was facilitated by owning Hungarian language skills on the one hand and possibility of obtaining Hungarian citizenship on the other. However, the number of Transcarpathian hungarians affected by migration, as well as the nature, duration and purpose of their migration, have not yet been investigated quantitatively. Our paper attempts to answer the above questions by evaluating the results of a questionnaire survey

Maps on density operators preserving quantum f-divergences

For an arbitrary strictly convex function f defined on the non-negative real line we determine the structure of all transformations on the set of density operators which preserve the quantum f-divergence

Differential freezeout and pion interferometry at RHIC from covariant transport theory

Puzzling discrepancies between recent pion interferometry data on Au+Au reactions at s^1/2 = 130 and 200 AGeV from RHIC and predictions based on ideal hydrodynamics are analyzed in terms of covariant parton transport theory. The discrepancies of out and longitudinal radii are significantly reduced when the finite opacity of the gluon plasma is taken into account.Comment: 4 pages, 3 EPS figures. Submitted to PR

Finite hadronization time and unitarity in quark recombination model

The effect of finite hadronization time is considered in the recombination model, and it is shown that the hadron multiplicity turns out to be proportional to the initial quark density and unitarity is conserved in the model. The baryon to meson ratio increases rapidly with the initial quark density due to competition among different channels.Comment: 4 pages in RevTeX, 3 eps figures, to appear in J. Phys.G as a lette

A tanulás értelmezése a 21. században

Vista de fachada lateral del Hotel Tequendama. El Hotel Tequendama fue construido entre 1950 y 1953, en el marco de modernización de la ciudad. Fue diseñado por la firma estadounidense Holabird, Rood y Burgee y construido por la firma nacional Cuéllar-Serrano-Gómez. Está ubicado en la calle 26 con carrera 10 (décima)