Centro Federal Of Educacao Tecnologica Celso Suckow Da Fonseca

Nova Friburgo, Brazil

Centro Federal Of Educacao Tecnologica Celso Suckow Da Fonseca

Nova Friburgo, Brazil
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Agency: European Commission | Branch: FP7 | Program: CSA | Phase: INFRA-2007-1.2.3;INFRA-2007-1.2-03 | Award Amount: 5.11M | Year: 2008

EELA-2 aims to build, on the current EELA e-Infrastructure, a high capacity, production-quality, scalable Grid Facility providing round-the-clock, worldwide access to distributed computing, storage and network resources for a wide spectrum of applications from European and Latin American scientific communities. The project will provide an empowered Grid Facility with versatile services fulfilling application requirements and ensure the long-term sustainability of the e-Infrastructure beyond the term of the project. The specific EELA-2 objectives are: - Build a Grid Facility by: Expanding the current EELA e-Infrastructure to consist of more production sites mobilising more computing nodes and more storage space, at start of the project and to further grow storage over the duration of the project; Providing, in collaboration with related projects (e.g. EGEE), the full set of Grid Services needed by all types of scientific applications; Supporting applications various types (from classical off-line data processing up to control and data acquisition of scientific instruments), selected against well defined criteria (including grid added value, suitability for Grid deployment, outreach/potential impact); - Ensure the Grid Facility sustainability: Through the already established and new contacts with policy/decision makers, collaborating with RedCLARA and NRENs and supporting the ongoing creation of e-Science Initiatives and/or National Grid initiatives (NGI). Building the support of the e-Infrastructure to provide a complete set of Global Services from a Central Operation Centre and to pave the way for the creation of Regional Operation Centres in Latin America: Attracting new applications; Making available knowledge of EELA-2 Grid Facility to all potential users, developers, and decision makers through an extensive Training and Dissemination program; Creating knowledge repositories federated with the EGEE ones.


Grigorio L.S.,Federal University of Rio de Janeiro | Grigorio L.S.,Centro Federal Of Educacao Tecnologica Celso Suckow Da Fonseca | Guimaraes M.S.,State University of Rio de Janeiro | Oliveira W.,Federal University of Juiz de fora | And 2 more authors.
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2011

We derive a U(1) effective theory of color confinement by applying the so-called Julia-Toulouse approach for defects condensation to the SU(2) restricted gauge theory defined by means of the Cho decomposition of the non-abelian connection. Cho's geometric construction naturally displays the topological degrees of freedom of the theory and can be used to put the Yang-Mills action into an abelianized form under certain conditions. On the other hand, the use of the Julia-Toulouse prescription to deal with the monopole condensation leads to an effective action describing the phase whose dynamics is dominated by the magnetic condensate. The effective theory we found describes the interaction between external electric currents displaying a short-range Yukawa interaction plus a linear confinement term that governs the long distance physics. © 2011 Elsevier B.V.


Lago B.L.,Centro Federal Of Educacao Tecnologica Celso Suckow Da Fonseca
Revista Brasileira de Ensino de Fisica | Year: 2015

The use of several resources in physics teaching is very important to help the students in the learning process. In this work we present an approach based on the use of music and information and communication technology (ICT) to illustrate some physical concepts from a wave physics course. With the aid of such resources, musical features as tone, beats, harmonics (artificial and natural ones) and chord formation will be discussed and illustrated in practice through the use of an electric guitar, a software and a computer. © The Sociedade Brasileira de Física.


Ribeiro L.C.,Centro Federal Of Educacao Tecnologica Celso Suckow Da Fonseca | Vernek E.,University Federal Of Uberlgndia | Martins G.B.,Oakland University | Anda E.V.,Pontifical Catholic University of Rio de Janeiro
Physical Review B - Condensed Matter and Materials Physics | Year: 2012

In this work we use the slave-boson mean-field approximation at finite U to study the effects of spin-spin correlations in the transport properties of two quantum dots coupled in series to metallic leads. Different quantum regimes of this system are studied in a wide range of the parameter space. The main aspects related to the interplay between the half-filling Kondo effect and the antiferromagnetic correlation between the quantum dots are reviewed. Slave-boson results for conductance, local density of states in the quantum dots, and the renormalized energy parameters are presented. As a different approach to the Kondo physics in a double-dot system, the Kondo cloud extension inside the metallic leads is calculated and its dependence with the interdot coupling is analyzed. In addition, the cloud extension permits the calculation of the Kondo temperature of the double quantum dot. This result is very similar to the corresponding critical temperature T c, as a function of the parameters of the system, as obtained by using the finite-temperature extension of the slave-boson mean-field approximation. © 2012 American Physical Society.


Grigorio L.S.,Federal University of Rio de Janeiro | Grigorio L.S.,Centro Federal Of Educacao Tecnologica Celso Suckow Da Fonseca | Guimaraes M.S.,State University of Rio de Janeiro | Rougemont R.,Federal University of Rio de Janeiro | Wotzasek C.,Federal University of Rio de Janeiro
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2010

We review two methods used to approach the condensation of defects phenomenon. Analyzing in details their structure, we show that in the limit where the defects proliferate until occupy the whole space these two methods are dual equivalent prescriptions to obtain an effective theory for the phase where the defects (like monopoles or vortices) are completely condensed, starting from the fundamental theory defined in the normal phase where the defects are diluted. © 2010 Elsevier B.V. All rights reserved.


Nascimento R.F.,Centro Federal Of Educacao Tecnologica Celso Suckow Da Fonseca | Mello S.L.A.,Federal University of Rio de Janeiro | Magnani B.F.,Federal University of Rio de Janeiro | Sant'Anna M.M.,Federal University of Rio de Janeiro | And 2 more authors.
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2013

We have measured the total electron detachment cross sections of the negative ions C-, CH-, C2-, and C2H- incident on molecular nitrogen in the velocity range 0.22-0.56 a.u. The data were measured with reliable normalization and, particularly in the critical case of the C- projectile, the absence of beam contamination due to long-lived metastable states. Comparison of all measurements of cross sections with experimental data for other projectiles shows a common velocity dependence with a maximum near 0.4 a.u. This behavior suggests a connection between the anion-N2 electron-loss collision dynamics and that of the shape-resonance process dominant in low-velocity electron-N2 total electron scattering. © 2013 American Physical Society.


Grigorio L.S.,Federal University of Rio de Janeiro | Grigorio L.S.,Centro Federal Of Educacao Tecnologica Celso Suckow Da Fonseca | Guimaraes M.S.,State University of Rio de Janeiro | Rougemont R.,Federal University of Rio de Janeiro | Wotzaseka C.,Federal University of Rio de Janeiro
Journal of High Energy Physics | Year: 2011

In this work the phenomenon of charge confinement is approached in various contexts. An universal criterion for the identification of this phenomenon in Abelian gauge theories is suggested: the so-called spontaneous breaking of the brane symmetry. This local symmetry has its most common manifestation in the Dirac string ambiguity present in the electromagnetic theory with monopoles. The spontaneous breaking of the brane symmetry means that the Dirac string becomes part of a brane invariant observable which hides the realization of such a symmetry and develops energy content in the confinement regime. The establishment of this regime can be reached through the condensation of topological defects. The efiective theory of the confinement regime can be obtained with the Julia-Toulouse prescription which (originally introduced as the dual mechanism to the Abelian Higgs Mechanism) is generalized in this paper in order to become fully compatible with Elitzur's theorem and describe more general condensates which may break Lorentz and discrete spacetime symmetries. This generalized approach for the condensation of defects is presented here through a series of difierent applications. © 2011 SISSA.


Grigorio L.S.,Centro Federal Of Educacao Tecnologica Celso Suckow Da Fonseca | Guimaraes M.S.,State University of Rio de Janeiro | Rougemont R.,Federal University of Rio de Janeiro | Wotzasek C.,Federal University of Rio de Janeiro | Zarro C.A.D.,Federal University of Rio de Janeiro
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2012

The Julia-Toulouse mechanism is used to show that the topological Abelian BF term may be induced by the condensation of electric charges. As an application, we discuss the subtle question of including consistently magnetic defects in the Maxwell-BF theory as a way to avoid the usual problems of current conservation, charge quantization, Elitzur's theorem violation, and the reality of the Dirac brane produced by nonminimal coupling. We also discuss a new way of obtaining Dirac's veto, which is based on the so-called Dirac brane symmetry. © 2012 American Physical Society.


Mondaini F.,Federal University of Rio de Janeiro | Mondaini F.,Centro Federal Of Educacao Tecnologica Celso Suckow Da Fonseca | Moriconi L.,Federal University of Rio de Janeiro
Physics Letters, Section A: General, Atomic and Solid State Physics | Year: 2012

We perform, with the help of cloud computing resources, extensive Langevin simulations which provide compelling evidence in favor of a general Markovian framework for unbiased three-dimensional polymer translocation. Our statistical analysis consists of careful evaluations of (i) two-point correlation functions of the translocation coordinate and (ii) the empirical probabilities of complete polymer translocation (taken as a function of the initial number of monomers on a given side of the membrane). We find good agreement with predictions derived from the Markov chain approach recently addressed in the literature by the present authors. © 2012 Elsevier B.V.


Grigorio L.S.,Federal University of Rio de Janeiro | Grigorio L.S.,Centro Federal Of Educacao Tecnologica Celso Suckow Da Fonseca | Guimaraes M.S.,State University of Rio de Janeiro | Rougemont R.,Federal University of Rio de Janeiro | Wotzasek C.,Federal University of Rio de Janeiro
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2012

In this Letter we use the Julia-Toulouse approach for condensation of defects in order to obtain an effective confinement theory for external chromoelectric probe charges in SU(3) gauge theory in the regime with condensed chromomagnetic monopoles. We use the Cho decomposition of the non-Abelian connection in order to reveal the Abelian sector of the non-Abelian gauge theory and the associated topological defects (monopoles) without resorting to any gauge fixing procedure. Using only the Abelian sector of the theory, we construct a hydrodynamic effective theory for the regime with condensed defects in such a way that it is compatible with the Elitzur's theorem. The resulting effective theory describes the interaction between external chromoelectric probe charges displaying a short-range Yukawa interaction plus a linear confining term that governs the long distance physics. © 2012 Elsevier B.V.

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