Artigos  Física e Química  FEG
Browse by
Recent Submissions

Morphological and structural variations in anodic films grown on polished and electropolished titanium substrates
(Materials Research, 2019) [Artigo]The objective of this work was to investigate the effects of anodization parameters on the anatase phase formation of titanium oxide films, which have been grown on both electropolished and nonelectropolished titanium ... 
Quantum dynamics of scalar particles in the space–time of a cosmic string in the context of gravity's rainbow
(Annals of Physics, 2020) [Artigo]We analyze the dynamics of scalar particles in gravity's rainbow considering the space–time of a cosmic string in this modified gravity. Thus, we solve the Klein–Gordon equation for two types of potential in which two ... 
Theoretical modeling and experimental validation of hydrodynamic cavitation reactor with a Venturi tube for sugarcane bagasse pretreatment
(Bioresource Technology, 2020) [Artigo]A hydrodynamic cavitation reactor with a Venturi tube was modeled through a computational fluid dynamics approach in order to evaluate the influence of pressure ratio, diameter and length of the throat zone. A cavitation ... 
Gaussian process estimation of transition redshift
(Journal of Cosmology and Astroparticle Physics, 2020) [Artigo]This paper aims to put constraints on the transition redshift zt, which determines the onset of cosmic acceleration, in cosmologicalmodel independent frameworks. In order to do that, we use the nonparametric Gaussian ... 
Comment on “Dirac fermions in Som–Raychaudhuri spacetime with scalar and vector potential and the energy momentum distributions [Eur. Phys. J. C (2019) 79:541]”
(European Physical Journal C, 2020) [Nota] 
Unitarity of SinghHagen Model in D Dimensions
(Advances in High Energy Physics, 2020) [Artigo]The particle content of the SinghHagen model (SH) in D dimensions is revisited. We suggest a complete set of spinprojection operators acting on totally symmetric rank3 fields. We give a general expression for the ... 
New pointlike sources and a conducting surface in Maxwell–Chern–Simons electrodynamics
(European Physical Journal C, 2020) [Artigo]We investigate some aspects of the Maxwell–Chern–Simons electrodynamics focusing on physical effects produced by the presence of stationary sources and a perfectly conducting plate (mirror). Specifically, in addition to ... 
On the generalized spinor classification: beyond the Lounesto’s classification
(European Physical Journal C, 2020) [Artigo]In this paper we advance into a generalized spinor classification, based on the socalled Lounesto’s classification. The program developed here is based on an existing freedom on the spinorial dual structures definition, ... 
Mirrors and field sources in a Lorentzviolating scalar field theory
(Nuclear Physics B, 2020) [Artigo]In this paper we consider classical effects in a model for a scalar field incorporating Lorentz symmetry breaking due to the presence of a single background vector vμ coupled to its derivative. We investigate of the ... 
Comment on “Comment on Linear confinement of a scalar particle in a Gödeltype spacetime”
(European Physical Journal C, 2020) [Nota]We show that from an appropriate manipulation of the biconfluent Heun differential equation one can obtain the correct expression for the energy eigenvalues for the Klein–Gordon equation without potential in the background ... 
Unitarity of higher derivative spin3 models
(Annals of Physics, 2020) [Artigo]The fourth order in derivatives New Massive Gravity model NMG, describes a massive spin2 particle in D=2+1. At the linearized level a proof of unitarity necessarily implies that the generalization to higher dimensions ... 
Scalar bosons with Coulomb potentials in a cosmic string background: scattering and bound states
(European Physical Journal Plus, 2020) [Artigo]The relativistic quantum motion of scalar bosons under the influence of a full vector (minimal Aμ and nonminimal Xμ) and scalar (Vs) interactions embedded in the background of a cosmic string is explored in the context of ... 
Acceleration in Friedmann cosmology with torsion
(European Physical Journal C, 2019) [Artigo]A Friedmann like cosmological model in Einstein–Cartan framework is studied when the torsion function is assumed to be proportional to a single ϕ(t) function coming just from the spin vector contribution of ordinary matter. ... 
Soldering spin3 opposite helicities in D=2+1
(Physical Review D, 2019) [Artigo]Here we present the soldering of opposite helicity states of a spin3 particle, in D=2+1, into one parity doublet. The starting points may be either the sixth or fifthorder (in derivatives) spin3 selfdual models of ... 
More on dual actions for massive spin2 particles
(Classical And Quantum Gravity, 2020) [Artigo]Here we start from a dual version of Vasiliev's first order action for massless spin2 particles (linearized first order EinsteinHilbert) and derive, via KaluzaKlein dimensional reduction fromD+ 1 toDdimensions, a set ... 
Gravitational entropy of wormholes with exotic matter and in galactic halos
(International Journal Of Modern Physics D, 2020) [Artigo]In this work, we study and compare the features of gravitational entropy near the throat of transversable wormholes formed by exotic matter and wormholes in galactic halos. We have verified that gravitational entropy and ... 
Study of diglyme plasmas by mass spectrometry
(2017 16th Latin American Workshop On Plasma Physics (lawpp 2017), 2017) [Trabalho apresentado em evento]This paper deals with the study of the fragmentation process of diethylene glycol dimethyl ether (diglyme) molecule, i.e., (CH3OCH2CH2)(2)O; in low pressure RF excited plasma discharges. The study was carried out using ... 
Characterization of SiC and Al2O3 Ceramics Exposed to Nitrogen Ions from InverseZ Pinch Plasma Discharge
(2017 16th Latin American Workshop On Plasma Physics (lawpp 2017), 2017) [Trabalho apresentado em evento]Silicon carbide ceramics are used for several industry applications, such as structural coating, ballistic armor, thermal coating protection, high performance mirror substrate, catalyst supports, etc. In this work, dense ... 
THE NEAREARTH ASTEROID CHARACTERIZATION AND OBSERVATION (NEACO) MISSION
(Astrodynamics 2017, Pts Iiv, 2018) [Trabalho apresentado em evento]The NearEarth Asteroid Characterization and Observation (NEACO) mission proposes to explore the fastrotating asteroid (469219) 2016 HO3 with a SmallSat spacecraft and perform an early scientific investigation to enable ... 
Casimir effect for gauge scalars: The KalbRamond case (vol 72, art no 105012, 2005)
(Physical Review D, 2006) [Errata]