Navegação Ciências Exatas e da Terra por Autor "Haas, Fernando"
Resultados 1-20 de 31
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Bernstein–Greene–Kruskal and Case–Van Kampen Modes for the Landau–Vlasov Equation
(2022) [Artigo de periódico]The one-dimensional Landau–Vlasov equation describing ultracold dilute bosonic gases in the mean-field collisionless regime under strong transverse confinement is analyzed using traditional methods of plasma physics. ... -
Collisional effects, ion-acoustic waves, and neutrino oscillations
(2017) [Artigo de periódico]We analyze the role of collisional effects on the coupling between ion-acoustic waves and neutrino flavor oscillations, discussing its relevance for plasma instabilities in extreme plasma environments like in type II ... -
Compton scattering of plasmons
(2023) [Artigo de periódico]We extend de concept of Compton scattering to the case of plasmons. This concept was originally applied to electrons in vacuum. Here, we consider electrons in a plasma, and study the scattering properties of photon-plasmon ... -
Coupling between ion-acoustic waves and neutrino oscillations
(2017) [Artigo de periódico]The work investigates the coupling between ion-acoustic waves and neutrino flavor oscillations in a nonrelativistic electron-ion plasma under the influence of a mixed neutrino beam. Neutrino oscillations are mediated by ... -
Dynamics of antiproton plasma in a timedependent harmonic trap
(2021) [Artigo de periódico]An antiproton plasma confined in a quasi-1D device is described in terms of a self-consistent fluid formulation using a variational approach. Unlike previous treatments, the use of the time-dependent variational method ... -
Effective photon mass and exact translating quantum relativistic structures
(2016) [Artigo de periódico]Using a variation of the celebrated Volkov solution, the Klein-Gordon equation for a charged particle is reduced to a set of ordinary differential equations, exactly solvable in specific cases. The new quantum relativistic ... -
Electron holes in a regularized kappa background
(2023) [Artigo de periódico]The pseudopotential method is used to derive electron hole structures in a suprathermal plasma with a regularized κ probability distribution function background. The regularized character allows the exploration of small κ ... -
Electron holes in a κ distribution background with singularities
(2021) [Artigo de periódico]The pseudo-potential method is applied to derive diverse propagating electron–hole structures in a nonthermal or κ particle distribution function background. The associated distribution function Ansatz reproduces the Schamel ... -
High-harmonic generation by nonlinear resonant excitation of surface plasmon modes in metallic nanoparticles
(2014) [Artigo de periódico]The nonlinear electron dynamics in metallic nanoparticles is studied using a hydrodynamic model that incorporates most quantum many-body features, including spill-out and nonlocal effects as well as electron exchange and ... -
High-harmonic generation in a quantum electron gas trapped in a nonparabolic and anisotropic well
(2016) [Artigo de periódico]An effective self-consistent 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
(2014) [Artigo de periódico]We consider the collective neutrino plasma interactions and study the electron plasma instabilities produced by a nearly mono-energetic neutrino beam in a plasma. We describe the mutual interaction between neutrino flavor ... -
Instabilities and propagation of neutrino magnetohydrodynamic waves in arbitrary direction
(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 ... -
Ion-acoustic cnoidal waves in a quantum plasma
(2014) [Artigo de periódico]Nonlinear ion-acoustic cnoidal wave structures are studied in an unmagnetized quantum plasma. Using the reductive perturbation method, a Korteweg-de Vries equation is derived for appropriate boundary conditions and nonlinear ... -
Ion-acoustic envelope modes in a degenerate relativistic electron-ion plasma
(2016) [Artigo de periódico]A self-consistent relativistic two-fluid model is proposed for one-dimensional electron-ion plasma dynamics. A multiple scales perturbation technique is employed, leading to an evolution equation for the wave envelope, in ... -
Ion-beam–plasma interaction effects on electrostatic solitary wave propagation in ultradense relativistic quantum plasmas
(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 ... -
Ion-beam/plasma modes in ultradense relativistic quantum plasmas : dispersion characteristics and beam-driven instability
(2017) [Artigo de periódico]A relativistic quantum-hydrodynamic plasma model is proposed, to model the propagation of electrostatic waves in an ultradense quantum electron-ion plasma in the presence of an ion beam. A dispersion relation is derived ... -
Large amplitude oscillations in a trapped dissipative electron gas
(2018) [Artigo de periódico]A collisional trapped non-neutral 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 ion-acoustic waves in nonrelativistic quantum plasmas with arbitrary degeneracy
(2015) [Artigo de periódico]Linear and nonlinear ion-acoustic 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
(2018) [Artigo de periódico]Using a two-species 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
(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 ...
