31 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Universidade Federal FluminenseBR8 papers
- Universidade Federal de Juiz de ForaBR5 papers
- Federal Center for Technological Education of Minas GeraisBR3 papers
- Tomsk State Pedagogical UniversityRU3 papers
- National Research Tomsk State UniversityRU2 papers
- Universidade Federal do Rio Grande do SulBR2 papers
- Centro Brasileiro de Pesquisas FísicasBR1 paper
- Colégio Pedro IIBR1 paper
- Federal Center for Technological Education Celso Suckow da FonsecaBR1 paper
- Federal University of São João del-ReiBR1 paper
- ICTP South American Institute for Fundamental Research1 paper
- Instituto Federal de Educação, Ciência e Tecnologia do Triângulo MineiroBR1 paper
20 papers
Main -eigenvalues of quasi-threshold graphs
Átila Jones, Vilmar Trevisan, Cybele T. M. Vinagre
In this note, we present a structural description of certain connected cographs having main signless Laplacian eigenvalues. This result allows us to characterize the cog…
Exact Foldy-Wouthuysen transformation for a Dirac equation describing the interaction of spin-1/2 relativistic particles with an external electromagnetic field
Bruno Gonçalves, Mário M. Dias Júnior, Larissa F. Eleotério
The Thomas-Bargmann-Michel-Telegdi (T-BMT) equation is derived using the Exact Foldy-Wouthuysen transformation. Extra new terms were found, and we discuss their possible physical a…
Exploring structural properties of -trees and block graphs
Lilian Markenzon, Allana S. S. Oliveira, Cybele T. M. Vinagre
We present a new characterization of -trees based on their reduced clique graphs and -line graphs, which are block graphs. We explore structural properties of these two c…
Master equations governing the coupling between spin-currents and gravity
A. de Camargo, R. F. Sobreiro, V. J. Vasquez Otoya
In this work we consider the Einstein-Hilbert action in the first order order formalism coupled to Dirac spinors. From the little group symmetry, we derive the corresponding Bargma…
Product Partition Dynamic Generalized Linear Models
Victor S. Comitti, Fábio N. Demarqui, Thiago R. dos Santos +1
Detection and modeling of change-points in time-series can be considerably challenging. In this paper we approach this problem by incorporating the class of Dynamic Generalized Lin…
The Exact Foldy-Wouthuysen Transformation for a Dirac Theory Revisited
Bruno Gonçalves, Mário M. Dias Júnior, Baltazar J. Ribeiro
The Exact Foldy-Wouthuysen transformation (EFWT) method is generalized here. In principle, it is not possible to construct the EFWT to any Hamiltonian. The transformation condition…
Constructing the independent basis of total derivative curvature-dependent terms in
Fabricio M. Ferreira, Ilya L. Shapiro
Total derivative terms play an important role in the integration of conformal anomaly. In four dimensional space there is only one such term, namely . In the cas…
Integration of trace anomaly in 6D
Fabricio M. Ferreira, Ilya L. Shapiro
The trace anomaly in six-dimensional space is given by the local terms which have six derivatives of the metric. We find the effective action which is responsible for the anomaly.…
Error concealment by means of motion refinement and regularized Bregman divergence
Alessandra M. Coelho, Vania V. Estrela, Felipe P. do Carmo +1
This work addresses the problem of error concealment in video transmission systems over noisy channels employing Bregman divergences along with regularization. Error concealment in…
EM-Based Mixture Models Applied to Video Event Detection
Alessandra Martins Coelho, Vania V. Estrela
Surveillance system (SS) development requires hi-tech support to prevail over the shortcomings related to the massive quantity of visual information from SSs. Anything but reduced…
Physical Properties of the Spin Hamiltonian on Honeycomb Lattice Samples with Kekulé and Vacuum Polarization Corrections
Ricardo S. Martins, Elena Konstantinova, Humberto Belich +1
Magnetic and thermodynamical properties of a system of spins in a honeycomb lattice, such as magnetization, magnetic susceptibility and specific heat, in a low-temperature regime a…
The space-time torsion in the context of the Exact Foldy-Wouthuysen Transformation for a Dirac fermion
Bruno Goncalves, Baltazar Jonas Ribeiro Morais, Dante Donizeti Pereira +1
In this work we focus our attention in the inconsistency that appears when the Semi-Exact Foldy-Wouthuysen transformation for the Dirac field interacting with space-time torsion fi…
On the conformal properties of topological terms in even dimensions
Fabricio M. Ferreira, Ilya L. Shapiro, Poliane M. Teixeira
Conformal properties of the topological gravitational terms in , and are discussed. It is shown that in the last two cases the integrands of these terms, when bein…
Probing the Circumnuclear Stellar Populations of Starburst Galaxies in the Near-infrared
N. Z. Dametto, R. Riffel, M. G. Pastoriza +3
We employ the NASA Infrared Telescope Facility's near-infrared spectrograph SpeX at 0.8-2.4m to investigate the spatial distribution of the stellar populations (SPs) in four wel…
The Exact Foldy-Wouthuysen Transformation for a Dirac Theory with the complete set of CPT-Lorentz violating terms
Bruno Gonçalves, Mário M. Dias Júnior, Baltazar J. Ribeiro
The exact Foldy-Wouthuysen transformation is performed in order to study the Dirac field interacting with many possible external fields associated with CPT-Lorentz violation. We al…
State-of-the Art Motion Estimation in the Context of 3D TV
Vania V. Estrela, Alessandra M. Coelho
Progress in image sensors and computation power has fueled studies to improve acquisition, processing, and analysis of 3D streams along with 3D scenes/objects reconstruction. The r…
DBI equations and holographic DC conductivity
Alfonso Ballon-Bayona, Cristine N. Ferreira, Victor J. Vasquez Otoya
We provide a simple method for writing the Dirac-Born-Infeld (DBI) equations of a Dp-brane in an arbitrary static background whose metric depends only on the holographic radial coo…
de Sitter gauge theories and induced gravities
R. F. Sobreiro, A. A. Tomaz, V. J. Vasquez Otoya
Pure de Sitter, anti de Sitter, and orthogonal gauge theories in four-dimensional Euclidean spacetime are studied. It is shown that, if the theory is asymptotically free and a dyna…
The role of gauge symmetry in spintronics
R. F. Sobreiro, V. J. Vasquez Otoya
In this work we employ a field theoretical approach to explain the nature of the non-conserved spin current in spintronics. In particular, we consider the usual U(1) gauge theory f…
Ultrarelativistic Bose-Einstein Gas on Lorentz Symmetry Violation
J. A. de Sales, T. Costa-Soares, V. J. Vasquez Otoya
In this paper we study the effects of Lorentz Symmetry Breaking on thermodynamics properties of ideal gases. Inspired in the dispersion relation came from the Carroll-Field-Jackiw…