Comparing different freeze-out scenarios in azimuthal hadron correlations induced by fast partons

I review the linearized hydrodynamical treatment of a fast parton traversing a perturbative quark-gluon plasma. Using numerical solutions for the medium's response to the fast parton, I obtain the medium's distribution function which is then used in a Cooper-Frye freeze-out prescription to obtain an azimuthal particle spectrum. Two different freeze-out scenarios are considered which yield significantly different results. I conclude that any meaningful comparison of azimuthal hadron correlation functions to RHIC data requires implementing a realistic freeze-out scenario in an expanding medium.Comment: Contribution to the Proceedings for 2008 Hot Quarks in Estes Park, CO, as accepted for publication in EPJ-

A comprehensive description of multiple observables in heavy-ion collisions at SPS

Combining and expanding on work from previous publications, a model for the evolution of ultrarelativistic heavy-ion collisions at the CERN SPS for 158 AGeV beam energy is presented. Based on the assumption of thermalization and a parametrization of the space-time expansion of the produced matter, this model is able to describe a large set of observables including hadronic momentum spectra, correlations and abundancies, the emission of real photons, dilepton radiation and the suppression pattern of charmonia. Each of these obervables provides unique capabilities to study the reaction dynamics and taken together they form a strong and consistent picture of the evolving system. Based on the emission of hard photons, we argue that a strongly interacting, hot and dense system with temperatures above 250 MeV has to be created early in the reaction. Such a system is bound to be different from hadronic matter and likely to be a quark-gluon plasma, and we find that this assumption is in line with the subsequent evolution of the system that is reflected in other observables.Comment: 21 pages, 10 figures, submitted to J. Phys.

Gain in quantum cascade lasers and superlattices: A quantum transport theory

Gain in current-driven semiconductor heterostructure devices is calculated within the theory of nonequilibrium Green functions. In order to treat the nonequilibrium distribution self-consistently the full two-time structure of the theory is employed without relying on any sort of Kadanoff-Baym Ansatz. The results are independent of the choice of the electromagnetic field if the variation of the self-energy is taken into account. Excellent quantitative agreement is obtained with the experimental gain spectrum of a quantum cascade laser. Calculations for semiconductor superlattices show that the simple 2-time miniband transport model gives reliable results for large miniband widths at room temperatureComment: 8 Pages, 4 Figures directly included, to appear in Physical Review

Quark Matter 2006: high-pT and jets

An overview of new experimental results on high-\pT{} particle production and jets in heavy ion collisions from the Quark Matter 2006 conference is presented.Comment: Presented at Quark Matter 200

Compartimentação geomorfológica das bacias hidrográficas dos rios Macacu e Caceribu - Recôncavo da Baixada da Guanabara /RJ.

A geomorfologia das bacias dos rios Macacu e Caceribu revela um mosaico de paisagens condicionado pela tectônica Cenozoica e pela variação do nível relativo do mar. Sua compartimentação compreende 10 unidades geomorfológicas: escarpa da serra dos Órgãos; espigão das serras de Santana e da Botija; maciços da Região dos Lagos; maciços alcalinos de Tanguá, Rio Bonito e Soarinho; alto platô da serra dos Órgãos; superfície aplainada da Região dos Lagos; bacia de Macacu; e baixada da Baía de Guanabara

Geotecnologia 3D na compartimentação geomorfológica das bacias hidrográficas dos rios Macacu e Caceribu - Recôncavo da Baixada da Guanabara /RJ.

É indiscutível o uso cada vez maior da tecnologia 3D nos mapeamentos do meio físico, incluindo a geomorfologia. Os modelos digitais de elevação somados às ortofotos de alta resolução fornecem ao intérprete um material que facilita e eleva a acurácia da fotointerpretação, produzindo excelentes resultados. Com o uso de softwares capazes de elaborar visualizações 3D, compartimentou-se as unidades de relevo das Bacias Hidrográficas dos rios Macacu e Caceribu - Recôncavo da Baixada da Guanabara/RJ

Photon Production in Hot and Dense Strongly Interacting Matter

This text is meant as an introduction to the theoretical physics of photon emission in hot and dense strongly interacting matter, the principal application being relativistic nuclear collisions. We shall cover some of the results and techniques appropriate for studies at SPS, RHIC, and LHC energiesComment: 35 pages, accepted for publication, Landolt-Boernstein Volume 1-23