On the consistency conditions to braneworlds in scalar-tensor gravity for arbitrary dimensions

We derive an one-parameter family of consistency conditions to braneworlds in the Brans-Dicke gravity. The General Relativity case is recovered by taking a correct limit of the Brans-Dicke parameter. We show that it is possible to build a multiple AdS brane scenario in a six-dimensional bulk only if the brane tensions are negative. Besides, in the five-dimensional case, it is showed that no fine tuning is necessary between the bulk cosmological constant and the brane tensions, in contrast to the Randall-Sundrum model. Copyright © owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial- ShareAlike Licence.

Hamilton-Jacobi formalism on the null-plane: Applications

In this work we discuss the Hamilton-Jacobi formalism for fields on the null-plane. The Real Scalar Field in (1+1) - dimensions is studied since in it lays crucial points that are presented in more structured fields as the Electromagnetic case. The Hamilton-Jacobi formalism leads to the equations of motion for these systems after computing their respective Generalized Brackets. Copyright © owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.

Podolsky's electromagnetic theory on the null-plane

We have analyzed the null-plane canonical structure of Podolsky's electromagnetic theory. As a theory that contains higher order derivatives in the Lagrangian function, it was necessary to redefine the canonical momenta related to the field variables. We were able to find a set of first and second-class constraints, and also to derive the field equations of the system. Copyright © owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.

QCD phenomenology with infrared finite SDE solutions

Recent progress in the solution of Schwinger-Dyson equations (SDE), as well as lattice simulation of pure glue QCD, indicate that the gluon propagator and coupling constant are infrared (IR) finite. We discuss how this non-perturbative information can be introduced into the QCD perturbative expansion in a consistent scheme, showing some examples of tree level hadronic reactions that successfully fit the experimental data with the gluon propagator and coupling constant depending on a dynamically generated gluon mass. This infrared mass scale acts as a natural cutoff and eliminates some of the ad hoc parameters usually found in perturbative QCD calculations. The application of these IR finite Green's functions in the case of higher order terms of the perturbative expansion is commented. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.

Relativistic three-body model for final state interaction in D+ → K-π+π+ decay

A challenge in mesonic three-body decays of heavy mesons is to quantify the contribution of re-scattering between the final mesons. D decays have the unique feature that make them a key to light meson spectroscopy, in particular to access the Kn S-wave phase-shifts. We built a relativis-tic three-body model for the final state interaction in D+ → K -π+π+ decay based on the ladder approximation of the Bethe-Salpeter equation projected on the light-front. The decay amplitude is separated in a smooth term, given by the direct partonic decay amplitude, and a three-body fully interacting contribution, that is factorized in the standard two-meson resonant amplitude times a reduced complex amplitude that carries the effect of the three-body rescattering mechanism. The off-shell reduced amplitude is a solution of an inhomogeneous Faddeev type three-dimensional integral equation, that includes only isospin 1/2 K -π+ interaction in the S-wave channel. The elastic K-π+ scattering amplitude is parameterized according to the LASS data[1]. The integral equation is solved numerically and preliminary results are presented and compared to the experimental data from the E791 Collaboration[2, 3] and FOCUS Collaboration[4, 5].

Chiral symmetry breaking with a confining propagator and dynamically massive gluons

Chiral symmetry breaking in QCD is studied introducing a confining effective propagator, as proposed recently by Cornwall, and considering the effect of dynamically massive gluons. The effective confining propagator has the form 1/(k2 +m2)2 and we study the bifurcation equation finding limits on the parameter m below which a satisfactory fermion mass solution is generated. Since the coupling constant and gluon propagator are damped in the infrared, due to the presence of a dynamical gluon mass, the major part of the chiral breaking is only due to the confining propagator and related to the low momentum region of the gap equation. We study the asymptotic behavior of the gap equation containing this confinement effect and massive gluon exchange, and find that the symmetry breaking can be approximated by an effective four-fermion interaction generated by the confining propagator. We compute some QCD chiral parameters as a function of m, finding values compatible with the experimental data. We find a simple approximate relation between the fermion condensate and dynamical mass for a given representation as a function of the parameters appearing in the effective confining propagator. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.

Poética da cabaça: fruto de tradição, arte e comunicação

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Entre a espada, a cruz e a pena: impressões sobre o Tawantinsuyu nos primeiros relatos da conquista

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

O Brasil e a Guerra do Pacífico: alianças estratégicas e relações diplomáticas (1879-1883)

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

O universo imaginário dos holandeses no Brasil seiscentista: um estudo da narrativa do viajante Joan Nieuhof

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Road Concessions in Latin America: Achievements and Challenges

Concessions have become an important mechanism in Latin America for attracting financing and private management to the highway sector. Highways are one of the areas of transport infrastructure in which this concept in long-term investment in road conservation and management has been widely applied and the concession-holder's costs are recouped through tolls and other complementary mechanisms.After a brisk start in the 1990s, the pattern of road concessions has proved to be less dynamic in the current decade. Nevertheless, highway concessions have expanded significantly and now account for 1% of the total inter-city road network. The international seminar entitled "Concessions for the provision of transport infrastructure: challenges for Latin America" was organized jointly by the Economic Commission for Latin America and the Caribbean (ECLAC) and the Agency for the Promotion of Private Investment of Peru (PROINVERSION) and held in Lima, Peru, on 13 and 14 November 2003.

New trends in ICT

NFC technology: progress, obstacles and forecasts, report .-- Downloads of records and books are increasing, report .-- Broadband promotion law in Peru, interview to Roberto Ortiz , Ministry of Transport and Communications of Peru .-- “What Rio has done is truly ground-breaking”, interview to Guruduth Banavar, IBM .-- “The idea is to enable people who have a device but no Internet to connect securely and free of charge” interview to Oliver Flögel, Digital Development Chile .-- “The advent of big data makes communications infrastructure even more important”, interview to José Miguel Piquer, INRIA Chile.

Network for Cooperation in Integrated Water Resource Management for Sustainable Development in Latin America and the Caribbean No. 43

Editorial remarks.-- Open discussion: Energy efficiency and economic regulation in water supply and sewerage services ; Policies and institutional frameworks for drinking water supply and sanitation.-- News of the network: The goal of food self-sufficiency of the countries of the cooperation council for de Arab States of the Gulf ; Narrowing the gaps in drinking water and sanitation: an opportunity for users ; Water Users'Organizations Act of Peru ; Commission for the Integrated management of the Tárcoles River Basin, Costa Rica ; Water and sanitation Management Unit in Panama.-- Courses: Course "Strategic aspects of irrigation".-- Internet and WWW news

Network for Cooperation in Integrated Water Resource Management for Sustainable Development in Latin America and the Caribbean No. 40

Editorial remarks.-- Open discussion: Regulation under the public model of service provision ; Regulatory progress and challenges in Argentina ; Twenty years of SUNASS: development, experience, lessons learned and challenges ; Possible conflict between efficiency and sustainability ; Best practices in regulating State-owned and municipal water utilities.-- News of the Network: Water use charge in the Province of Buenos Aires ; National Drinking Water and Sanitation Sector Policy of Guatemala ; Sanitation Services Modernization Law of Peru ; Internet and WWW News