• Chaotic interaction of langmuir solitons and long wavelength radiation 

      Erichsen Junior, Rubem; Oliveira, Glaucius Iahnke de; Rizzato, Felipe Barbedo (1998) [Artigo de periódico]
      In this work we analyze the interaction of isolated solitary structures and ion-acoustic radiation. If the radiation amplitude is small solitary structures persist, but when the amplitude grows energy transfer towards small ...
    • Dispersive effects on the main wave modulational instability in free electron lasers 

      Rizzato, Felipe Barbedo (1990) [Artigo de periódico]
      The main-wave one-dimensional modulational instability due to the dispersive terms of the wave equation in a free-electron laser is introduced and analyzed. We derive the appropriate dispersion relation and compare its ...
    • Efeitos de superposição em sistema de sólitons 

      Hadjimichef, Dimiter (1991) [Dissertação]
      Quando os núcleons ligados num núcleo se sobrepõem, a sua estrutura interna influencia as propriedades nucleares. Em especial, a estatística dos quanta elementares que constituem o núcleon se torna relevante. No intuito ...
    • Manifestly covariant approach for the one-soliton sector 

      Girotti, Horacio Oscar (1978) [Artigo de periódico]
      The one-loop contributions to the meson propagator and to the meson-soliton scattering amplitude in the one-soliton sector are analyzed using ordinary Feynman rules. It is found that, at the level of the propagator, the ...
    • Nonintegrable dynamics of the triplet-triplet spatiotemporal interaction 

      Lopes, Sergio Roberto; Rizzato, Felipe Barbedo (1999) [Artigo de periódico]
      In this paper we examine the coupling of two wave triplets sharing two common modes. The analysis is performed in the solitonic sector of the parameter space where uncoupled solutions departing from linearly unstable ...
    • Nonlinear stability of solitons against strong external perturbations 

      Rizzato, Felipe Barbedo; Oliveira, Glaucius Iahnke de; Chian, Abraham Chian-Long (2003) [Artigo de periódico]
      We study soliton stability under the action of strong external perturbations. Limits on the weak perturbation approach are established with the help of average Lagrangian methods and full simulations. We found that for the ...
    • Scaling laws for breathing frequencies of solitary modes in the Zakharov equations 

      Oliveira, Glaucius Iahnke de; Rizzato, Felipe Barbedo (2002) [Artigo de periódico]
      We analyze typical time scales resulting from the coupled dynamics of high- and low-frequency wave components in solitary solutions of the Zakharov equations. Linear stability analysis around the solitary modes suggests ...
    • Solitons, chaos, and energy transfer in the Zakharov equations 

      Rizzato, Felipe Barbedo; Oliveira, Glaucius Iahnke de; Erichsen, Ronaldo (1998) [Artigo de periódico]
      In the present paper we investigate the process of energy transfer in the Zakharov equations. Energy is initially injected into modes with small wave vectors. When the modulational instability threshold is exceeded, some ...
    • Some comments about a static-localized solution for the massive thirring model 

      Falomir, H.; Fanchiotti, H.; Saravi, R.E. Gamboa; Girotti, Horacio Oscar; Martin, H. (1977) [Artigo de periódico]
      We derive the stability equation for a static-localized solution of the two-dimensional massive Thirring model. The corresponding eigenvalue spectrum is determined and compared with the eigenvalue spectrum of the stability ...