Rio de Janeiro, Brazil

State University of Rio de Janeiro
Rio de Janeiro, Brazil

Rio de Janeiro State University is one of the largest universities in Brazil. The university's law school is among the best in the country.Its main campus is located at Francisco Negrão de Lima in the Maracanã neighborhood of Rio de Janeiro city. Other campuses can found at: Nova Friburgo , Duque de Caxias, Ilha Grande, Resende, Teresópolis, and São Gonçalo. Wikipedia.

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Garcia de Andrade L.C.,State University of Rio de Janeiro
European Physical Journal C | Year: 2017

Earlier we have computed a Lorentz violation (LV) bound for torsion terms via galactic dynamos and found bounds similar to the one obtained by Kostelecky et al. (Phys Rev Lett 100:111102, 2008) which is of the order of 10 - 31 GeV. Their result was found making use of the axial torsion vector in terms of Dirac spinors and minimal torsion coupling in flat space-time of fermions. In this paper, a torsion dynamo equation obtained using the variation of the torsion trace and galaxy M51 data of 500 pc are used to place an upper bound of 10 - 26 GeV in LV, which agrees with the one by Kostelecky and his group using an astrophysical framework background. Their lowest bound was obtained in earth laboratory using dual masers. One of the purposes of this paper is to apply the Faraday self-induction magnetic equation, recently extended to torsioned space-time, by the author to show that it lends support to physics in Riemann–Cartan space-time, in several distinct physical backgrounds. Backreaction magnetic effects are used to obtain the LV bounds. Previously Bamba et al. (JCAP 10:058, 2012) have used the torsion trace in their teleparallel investigation of the IGMF, with the argument that the torsion trace leads to less weaker effects than the other irreducible components of the torsion tensor. LV is computed in terms of a chiral-torsion-like current in the new dynamo equation analogous to the Dvornikov and Semikoz dynamo equation with chiral magnetic currents. Making use of the chiral-torsion dynamo equation we estimate the LV bounds in the early universe to be of the order of 10 - 24 GeV, which was the order of the charged-lepton sector. Our main result is that it is possible to obtain more stringent bounds than the ones found in the fermion sector of astrophysics in the new revised 2017 data table for CPT and Lorentz violation by Kostelecky and Mewes. They found in several astrophysical backgrounds, orders of magnitude such as 10 - 24 and 10 - 23 GeV which are not so stringent as the one found here, of 10 - 26 GeV, in the torsion fermionic sector with the help of galaxy M51 data. It is also shown that non-gauge invariance of chiral dynamos and axial anomalies are obtained from the noninvariance of the electric fields under torsion spatial translations. © 2017, The Author(s).

Agency: European Commission | Branch: H2020 | Program: RIA | Phase: INT-03-2015 | Award Amount: 2.50M | Year: 2016

GLOBUS critically assesses the EUs impact on justice in a global system characterised by uncertainty, risk and ambiguity. GLOBUS defines a new research agenda for the study of the EUs global role. This agenda directs attention to underlying political and structural challenges to global justice that are prior to the distributive problem, as well as to the fact that what is just is contested both by theorists and policy makers. GLOBUS provides in depth knowledge of how the EU proceeds to promote justice within the specific fields of climate change, trade, development, asylum/migration and security while also speaking to the key horizontal issues of gender and human rights within each of these fields. Rather than focusing on a single dimension GLOBUS develops three different conceptions of justice. This nuanced conceptual scheme allows GLOBUS to address the multifaceted challenge of justice, and to specify the EUs real impact. GLOBUS takes heed of the reality of the foreign will through intense engagement with partners outside Europe. This provides a reality check of the limits and potential for the EUs future place in a multi-polar order. The three conceptions of justice as non-dominance, as impartiality and as mutual recognition all have limitations as they prioritise some challenges to global justice over others. These limitations are important in order to empirically discern inhibiting factors for global political justice such as power, unequal competences and the prevailing system of states as well as in order to specify how the EU contributes to justice. In order to develop a feasible model of justice promotion, we return to theory when data is collected and revise and amend the analytical model. We further factor in the viewpoints and experience of practitioners and stakeholders, GLOBUS provides policy-relevant recommendations that take into consideration ideal requirements while at the same time not losing sight of the realities of power.

Garcia de Andrade L.C.,State University of Rio de Janeiro
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2011

Campanelli et al. (2009) [9] have recently shown that electromagnetic fluctuations in Lorentz violation theories Colladay and Kostelecky (1998) [8] along differential rotation may induce galactic dynamo amplification of magnetic fields from primordial seeds. In this Letter, instead of using the Maxwell-Chern-Simmons-Lagrangian used in their paper, one adopts the Lagrangean of the type RijklFijFkl, where Rijkl represent the torsion modes, without dynamical curvature. This so-called Minkowski-Cartan spacetime M4 torsion modes, allows us to handle QED vacuum in any Ricci scalar electrodynamics Lagrangean. It is shown that axial-torsion modes electrodynamics allows us to obtain a slow decay of magnetic fields. Thus primordial seed fields are amplified from differential rotation and protogalaxy turbulence as galactic dynamo action. This is mainly due to the fact that the collapse of the protogalaxy induces a strong suppression of the magnetic field decay. Magnetic field anisotropies are also considered. To resume, photon-torsion axial coupling in the quantum electrodynamics (QED) framework in Riemann flat contortioned spacetime may induce galactic dynamos. Fourier space transformation are used to compute electrodynamic equations. © 2010 Elsevier B.V.

Upadhyay S.,State University of Rio de Janeiro | Das D.,University of Kentucky
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2014

We analyze the quantum ABJM theory on N=1 superspace in different gauges. We study the Batalin-Vilkovisky (BV) formulation for this model. By developing field/antifield dependent BRST transformation we establish connection between the two different solutions of the quantum master equation within the BV formulation. © 2014 The Authors.

de Oliveira N.A.,State University of Rio de Janeiro | von Ranke P.J.,State University of Rio de Janeiro
Physics Reports | Year: 2010

The magnetocaloric effect is the heating or cooling of magnetic materials when subjected to magnetic field variation. It is characterized by the temperature change (δTad) in an adiabatic process and by the entropy change (δSiso) in an isothermal process. The renewed interest in the magnetocaloric effect can be attributed to Brown's work concerning the near room temperature magnetic refrigerator and Pecharsky and Gschneidner's discovery of the giant magnetocaloric effect near room temperature in Gd5Si2Ge2. After these pioneering works, the magnetocaloric effect has been intensively studied in a great number of magnetic materials. Despite this intense study, the underlying physics behind the magnetocaloric effect is not yet completely understood. In this report, we discuss the theoretical aspects of the magnetocaloric effect in rare earth metals and their alloys as well as in transition metal based compounds. In particular, we discuss the effects of pressure, doping, anisotropy and magnetoelastic interaction on the magnetocaloric potentials δSiso and δTad. The magnetocaloric effect in rare earth based compounds is discussed by using model Hamiltonians of interacting localized magnetic moments, including the crystalline electrical field interaction and the magnetoelastic coupling. The discussion of the magnetocaloric effect in transition metal based compounds is made by using model Hamiltonians based in the framework of the band theory. The results discussed in this report reveal important aspects of the magnetocaloric effect as well as point out some new perspectives on this area of research. © 2009 Elsevier B.V.

Faizal M.,University of Waterloo | Upadhyay S.,State University of Rio de Janeiro
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2014

In this paper, we will analyze the ghost condensation in the ABJM theory. We will perform our analysis in N=1 superspace. We show that in the Delbourgo-Jarvis-Baulieu-Thierry-Mieg gauge the spontaneous breaking of BRST symmetry can occur in the ABJM theory. This spontaneous breaking of BRST symmetry is caused by ghost-anti-ghost condensation. We will also show that in the ABJM theory, the ghost-anti-ghost condensates remain present in the modified abelian gauge. Thus, the spontaneous breaking of BRST symmetry in ABJM theory can even occur in the modified abelian gauge. © 2014 The Authors. Published by Elsevier B.V.

de Camargo K.R.,State University of Rio de Janeiro
Cadernos de Saude Publica | Year: 2013

Quality assessment of scientific output is based extensively (if not exclusively) on quantitative bibliometric indicators, despite mounting criticism. The reaction by the academic community has increased in recent years. After presenting a critical evaluation of this model, the article presents an alternative qualitative model oriented towards removing the excessive stimulus for the unbridled production of articles that make a dubious contribution to science. Criticism of the proposed model is presented and discussed.

Garcia de Andrade L.C.,State University of Rio de Janeiro
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2012

It is well known that torsion induced magnetic fields may seed galactic dynamos, but the price one pays for that is the conformal and gauge invariance breaks and a tiny photon mass. More recently I have shown [L.C. Garcia de Andrade, Phys. Lett. B 468 (2011) 28] that magnetic fields decay in a gauge invariant non-minimal coupling theory of torsion is slow down, which would allow for dynamo action to take place. In this Letter, by adding a parity violation term of the type R μνρσε μνρσ to the non-coupling term, a magnetic dynamo equation is obtained. From dynamo equation it is shown that torsion terms only appear in the dynamo equation when diffusion in the cosmic plasma is present. Torsion breaks the homogeneity of the magnetic field in the universe. Since Zeldovich anti-dynamo theorem assumes that the spacetime should be totally flat, torsion is responsible for violation of anti-dynamo theorem in 2D spatial dimensions. Contrary to previous results torsion induced primordial magnetic fields cannot seed galactic dynamos since from torsion and diffusion coefficient the decaying time of the magnetic field is 10 6yrs, which is much shorter than the galaxy age. © 2012.

Nobre J.L.,State University of Rio de Janeiro
The British journal of nutrition | Year: 2012

It is known that Ca therapy may have anti-obesity effects. Since early weaning leads to obesity, hyperleptinaemia and insulin resistance, we studied the effect of dietary Ca supplementation in a rat model. Lactating rats were separated into two groups: early weaning (EW) - dams were wrapped with a bandage to interrupt lactation in the last 3 d of lactation and control (C) - dams whose pups had free access to milk during the entire lactation period (21 d). At 120 d, EW and C offspring were subdivided into four groups: (1) C, received standard diet; (2) CCa, received Ca supplementation (10 g of calcium carbonate/kg of rat chow); (3) EW, received standard diet; (4) EWCa, received Ca supplementation similar to CCa. The rats were killed at 180 d. The significance level was at P < 0·05. Adult EW offspring displayed hyperphagia (28 %), higher body weight (9 %) and adiposity (77 %), hyperleptinaemia (twofold increase), hypertriacylglycerolaemia (64 %), hyperglycaemia (16 %), higher insulin resistance index (38 %) and higher serum 25-hydroxyvitamin D 3 (fourfold increase), but lower adiponectinaemia:adipose tissue ratio (44 %). In addition, they showed Janus tyrosine kinase 2 and phosphorylated signal transducer and activator of transcription 3 underexpression in hypothalamus (36 and 34 %, respectively), suggesting leptin resistance. Supplementation of Ca for 2 months normalised these disorders. The EW group had no change in serum insulin, thyroxine or triiodothyronine, and Ca treatment did not alter these hormones. In conclusion, we reinforced that early weaning leads to late development of some components of the metabolic syndrome and leptin resistance. Dietary Ca supplementation seems to protect against the development of endocrine and metabolic disorders in EW offspring, maybe through vitamin D inhibition.

State University of Rio de Janeiro | Date: 2013-12-11

A device and method are disclosed for transporting equipment and the like, through the surf zone. The device (1) and respective transport method (M) use a specially designed anchor (3) and sling (4), the anchor (3) carrying a cable (5), the free ends of which remain on the beach or similar location (P), thus allowing equipment (AP) and other articles to be transported between the beach (P) and the region beyond the surf area (ZA) of sandy beaches, dispensing with the use of boats for that purpose. The technical field encompasses any activity performed in the vicinity of the surf area, such as recreational and professional fishing, coastal engineering works, such as measurement of shore profiles in the submerged part thereof, marine geology, detection of nutrients or pollutants near the surf area, physical oceanography, marine biology and dynamic sedimentation processes, among many others.

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