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Born-Oppenheimer approximation in an effective field theory language
(2018-01-01)
The Born-Oppenheimer approximation is the standard tool for the study of molecular systems. It is founded on the observation that the energy scale of the electron dynamics in a molecule is larger than that of the nuclei. ...
Enhancement in the double Higgs boson production by e+ e− annihilation and physics beyond the standard model.
(Universidade Estadual Paulista (Unesp), 2018-03-29)
The main goal of this dissertation is to show the enhancement of the cross-section for the double Higgs production through pair annihilation by including effective interactions and through the non-perturbative Sommerfeld ...
Accidental symmetries and massless quarks in the economical 3-3-1 model
(2015-02-17)
In the framework of a 3-3-1 model with a minimal scalar sector, known as the economical 3-3-1 model, we study its capabilities of generating realistic quark masses. After a detailed study of the symmetries of the model, ...
Métodos perturbativos e não-perturbativos em teoria quântica de campos no espaço-tempo curvo
(Universidade Federal de Juiz de Fora (UFJF)BrasilICE – Instituto de Ciências ExatasPrograma de Pós-graduação em FísicaUFJF, 2019)
Dinâmica de campos escalares fora do equilíbrio
(Universidade Estadual Paulista (Unesp), 2007-06-28)
We consider the nonequilibrium dynamics of the formation of a condensate in a spontaneously broken'lâmbda fi' POT. 4' relativistic quantum scalar field theory. The equation of motion of the corresponding order parameter ...
Inflationary gravitational waves from unified spinor fields
(Springer, 2018-12)
Recent observations of Gravitational Waves (GW) generated by black-hole collisions have opened a new window to explore the universe in diverse scales. Detection of primordial gravitational waves is expected to happen in ...
Nonlinear fluctuations in relativistic causal fluids
(Springer, 2020-07)
In the Second Order Theories (SOT) of real relativistic fluids, the non-ideal properties of the flows are described by a new set of dynamical tensor variables. In this work we explore the non-linear dynamics of those ...