Listar Ciencias Exactas y Naturales por autor "Vasconcellos, Cesar Augusto Zen"

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    • A chiral bag model with a soft surface : structure and solutions of the fuzzy and the modified fuzzy bag model 

      Vasconcellos, Cesar Augusto Zen; Coelho, Hélio Teixeira; Pilotto, Fernando Goncalves; Bodmann, Bardo Ernst Josef; Dillig, Manfred; Razeira, Moises (1998) [Artículo de periódico]
      In the present work we propose a new bag model for hadrons, called the modi ed fuzzy bag model (MFBM). The distinguishing feature of this model is the suppression of the pion eld, as it enters the bag, by means of a scalar ...

    • f0(1370) decay in the Fock-Tani formalism 

      Silva, Mario Luiz Lopes da; Silva, Daniel Tavares da; Vasconcellos, Cesar Augusto Zen; Hadjimichef, Dimiter (2007) [Artículo de periódico]
      We investigate the two-meson decay modes for f0(1370). In this calculation we consider this resonance as a glueball. The Fock-Tani formalism is introduced to calculate the decay width.

    • Investigation of nuclear structure by quasi-free scattering with polarized protons 

      Fernandez, Francisco; Maris, Theodor August Johannes; Schneider, Claudio; Vasconcellos, Cesar Augusto Zen (1981) [Artículo de periódico]
      Quasi-free scattering with polarized protons can be a sensitive method to probe certain spin correlations in the nuclear wave function. This is demonstrated by the comparison of the effective polarizations following from ...

    • Many-body forces in the equations of state of hyperonic matter 

      Gomes, Rosana de Oliveira; Dexheimer, Veronica Antocheviz; Schramm, Stefan; Vasconcellos, Cesar Augusto Zen (2015) [Artículo de periódico]
      In this work we introduce an extended version of the formalism proposed originally by Taurines et al. that considers the effects of many-body forces simulated by nonlinear self-couplings and meson–meson interaction ...

    • Matter-antimatter asymmetry and non-inertial effects 

      Silveira, Vinicius Medeiros Gomes da; Vasconcellos, Cesar Augusto Zen; Luna, Emerson Gustavo de Souza; Hadjimichef, Dimiter (2021) [Artículo de periódico]
      We investigate non-inertial effects on CP-violating processes using a model, based on the framework of quantum field theory in curved spacetimes, devised to account for the decay of accelerated particles. We show that the ...

    • Neutron stars in a class of nonlinear relativistic models 

      Taurines, Andre Ribeiro; Vasconcellos, Cesar Augusto Zen; Malheiro, Manuel; Chiapparini, Marcelo (2001) [Artículo de periódico]
      In this work we introduce a class of relativistic models for nuclear matter and neutron stars which exhibits a parametrization, through mathematical constants, of the nonlinear meson-baryon couplings. For appropriate choices ...

    • Phase transitions in neutron stars and gravitational wave emission 

      Marranghello, Guilherme Frederico; Vasconcellos, Cesar Augusto Zen; Pacheco, Jose Antonio de Freitas (2002) [Artículo de periódico]
      We review the detectability of gravitational waves generated by oscillations excited during a phase transition from hadronic matter to deconfined quark-gluon matter in the core of a neutron star. Neutron star properties ...