Navegação Ciências Exatas e da Terra por Autor "Haas, Fernando"
Resultados 120 de 23

Collisional effects, ionacoustic waves, and neutrino oscillations
Haas, Fernando; Pascoal, Kellen Alves; Mendonça, José Tito (2017) [Artigo de periódico]We analyze the role of collisional effects on the coupling between ionacoustic waves and neutrino flavor oscillations, discussing its relevance for plasma instabilities in extreme plasma environments like in type II ... 
Coupling between ionacoustic waves and neutrino oscillations
Haas, Fernando; Pascoal, Kellen Alves; Mendonça, José Tito (2017) [Artigo de periódico]The work investigates the coupling between ionacoustic waves and neutrino flavor oscillations in a nonrelativistic electronion plasma under the influence of a mixed neutrino beam. Neutrino oscillations are mediated by ... 
Effective photon mass and exact translating quantum relativistic structures
Haas, Fernando; Albarracin Manrique, Marcos Antonio (2016) [Artigo de periódico]Using a variation of the celebrated Volkov solution, the KleinGordon equation for a charged particle is reduced to a set of ordinary differential equations, exactly solvable in specific cases. The new quantum relativistic ... 
Highharmonic generation by nonlinear resonant excitation of surface plasmon modes in metallic nanoparticles
Hurst, Jérôme; Haas, Fernando; Manfredi, Giovanni; Hervieux, PaulAntoine (2014) [Artigo de periódico]The nonlinear electron dynamics in metallic nanoparticles is studied using a hydrodynamic model that incorporates most quantum manybody features, including spillout and nonlocal effects as well as electron exchange and ... 
Highharmonic generation in a quantum electron gas trapped in a nonparabolic and anisotropic well
Hurst, Jérôme; LévêqueSimon, Kévin; Hervieux, PaulAntoine; Manfredi, Giovanni; Haas, Fernando (2016) [Artigo de periódico]An effective selfconsistent model is derived and used to study the dynamics of an electron gas confined in a nonparabolic and anisotropic quantum well. This approach is based on the equations of quantum hydrodynamics, ... 
Influence of flavor oscillations on neutrino beam instabilities
Mendonça, José Tito; Haas, Fernando; Bret, Antoine Claude (2014) [Artigo de periódico]We consider the collective neutrino plasma interactions and study the electron plasma instabilities produced by a nearly monoenergetic neutrino beam in a plasma. We describe the mutual interaction between neutrino flavor ... 
Instabilities and propagation of neutrino magnetohydrodynamic waves in arbitrary direction
Haas, Fernando; Pascoal, Kellen Alves (2017) [Artigo de periódico]In a previous work [Haas et al., Phys. Plasmas 23, 012104 (2016)], a new model was introduced, taking into account the role of the Fermi weak force due to neutrinos coupled to magnetohydrodynamic plasmas. The resulting ... 
Ionacoustic cnoidal waves in a quantum plasma
Mahmood, Shahzad; Haas, Fernando (2014) [Artigo de periódico]Nonlinear ionacoustic cnoidal wave structures are studied in an unmagnetized quantum plasma. Using the reductive perturbation method, a Kortewegde Vries equation is derived for appropriate boundary conditions and nonlinear ... 
Ionacoustic envelope modes in a degenerate relativistic electronion plasma
Mckerr, Michael John Allen; Haas, Fernando; Kourakis, Ioannis (2016) [Artigo de periódico]A selfconsistent relativistic twofluid model is proposed for onedimensional electronion plasma dynamics. A multiple scales perturbation technique is employed, leading to an evolution equation for the wave envelope, in ... 
Ionbeam–plasma interaction effects on electrostatic solitary wave propagation in ultradense relativistic quantum plasmas
Elkamash, Ibrahem; Kourakis, Ioannis; Haas, Fernando (2017) [Artigo de periódico]Understanding the transport properties of charged particle beams is important not only from a fundamental point of view but also due to its relevance in a variety of applications. A theoretical model is established in this ... 
Ionbeam/plasma modes in ultradense relativistic quantum plasmas : dispersion characteristics and beamdriven instability
Elkamash, Ibrahem; Haas, Fernando; Kourakis, Ioannis (2017) [Artigo de periódico]A relativistic quantumhydrodynamic plasma model is proposed, to model the propagation of electrostatic waves in an ultradense quantum electronion plasma in the presence of an ion beam. A dispersion relation is derived ... 
Large amplitude oscillations in a trapped dissipative electron gas
Haas, Fernando; Soares, Luiz Gustavo Ferreira (2018) [Artigo de periódico]A collisional trapped nonneutral plasma is described by a hydrodynamical model in onedimensional geometry. For suitable initial conditions and velocity fields, the Lagrangian variables method reduces the pressure dominated ... 
Linear and nonlinear ionacoustic waves in nonrelativistic quantum plasmas with arbitrary degeneracy
Haas, Fernando; Mahmood, Shahzad (2015) [Artigo de periódico]Linear and nonlinear ionacoustic waves are studied in a fluid model for nonrelativistic, unmagnetized quantum plasma with electrons with an arbitrary degeneracy degree. The equation of state for electrons follows from a ... 
Magnetosonic waves in a quantum plasma with arbitrary electron degeneracy
Haas, Fernando; Mahmood, Shahzad (2018) [Artigo de periódico]Using a twospecies quantum hydrodynamic model, we derive the quantum counterpart of magnetosonic waves, in a plasma with arbitrary degree of degeneracy and taking into account quantum diffraction effects due to the ... 
Modified plasma waves described by a logarithmic electrodynamics
Haas, Fernando; Gaete, Patricio; Rosas, Leonardo Ospedal Prestes; HelayëlNeto, José Abdalla (2019) [Artigo de periódico]The propagation of plasma waves in a new nonlinear, logarithmic electrodynamics model is performed. A cold, uniform, collisionless fluid plasma model is applied. Electrostatic waves in magnetized plasma are shown to ... 
Neutrinodriven electrostatic instabilities in a magnetized plasma
Haas, Fernando; Pascoal, Kellen Alves; Mendonça, José Tito (2017) [Artigo de periódico]The destabilizing role of neutrino beams on the TrivelpieceGould modes is considered, assuming electrostatic perturbations in a magnetized plasma composed by electrons in a neutralizing ionic background, coupled to a ... 
Neutrino magnetohydrodynamics
Haas, Fernando; Pascoal, Kellen Alves; Mendonça, José Tito (2016) [Artigo de periódico]A new neutrino magnetohydrodynamics (NMHD) model is formulated, where the effects of the charged weak current on the electronion magnetohydrodynamic fluid are taken into account. The model incorporates in a systematic way ... 
Neutrino oscillations and instabilities in degenerate relativistic astrophysical plasmas
Haas, Fernando (2019) [Artigo de periódico]We set up a proposal to extend significantly recent works on neutrinoplasma interaction, allowing the possibility of deep degenerate and relativistic electrons, which are often present in compact stars such as highdensity ... 
Nonlinear ionacoustic solitons in a magnetized quantum plasma with arbitrary degeneracy of electrons
Haas, Fernando; Mahmood, Shahzad (2016) [Artigo de periódico]Nonlinear ionacoustic waves are analyzed in a nonrelativistic magnetized quantum plasma with arbitrary degeneracy of electrons. Quantum statistics is taken into account by means of the equation of state for ideal fermions ... 
Relativistic theory for localized electrostatic excitations in degenerate electronion plasmas
Mc Kerr, Michael; Haas, Fernando; Kourakis, Ioannis (2014) [Artigo de periódico]A selfconsistent relativistic twofluid model is proposed for electronion plasma dynamics. A onedimensional geometry is adopted. Electrons are treated as a relativistically degenerate fluid, governed by an appropriate ...