Perturbative Techniques
Mostrando 1-8 de 8 artigos, teses e dissertações.
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1. Locally Perturbative Multiscale Methods for Ionic Solute Transport in Clayly Soils / Modelos Multi-escala Localmente Perturbativos para o Transporte de Solutos Iônicos em Meios Porosos Argilosos
Este trabalho objetiva o desenvolvimento de modelos computacionais capazes de construir simulações numéricas mais realistas e menos custosas computacionalmente para o problema de descontaminação de solos argilosos por técnicas de eletrocinética. Resultados inovadores são obtidos aprimorando-se os modelos multi-escala desenvolvidos anteriormente por L
Publicado em: 2010
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2. Espalhamento de Férmions sob Influencia da Violação de Lorentz no Setor Fotônico / Scattering of Fermions under Influence of Violation Lorentz Sector Photonic
The standard model extension is a theoretical framework which includes the possibility of Lorentz symmetry violation in the Standard Model of elementary interactions. In electrodynamics, this possibility is represented by the term, KμFμF, that violates Lorentz symmetry without jeopardizing CPT symmetry, and the term "μvAμ@A, which violate
Publicado em: 2010
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3. Aspectos da não linearidade em fenômenos de ressurgimento por uma técnica não perturbativa
In the present work we apply a semi-classical non-perturbative technique to study revival times in relevant models. First we use a schematic model that is commonly used to simulate the interatomic interaction in Bose-Einstein condensates (BEC). The model has an exact solution and allows us understand the mathematical technique used in this work and its limit
Publicado em: 2009
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4. Regularizations: a unique prescription for all situations
A detailed investigation on the possible role played by the intrinsic arbitrariness of the perturbative evaluation of physical amplitudes and their symmetry relations, initiated in a first work, is continued. Previously announced results are detailed presented. The very general calculational method, concerning the divergences manipulations and calculations,
Brazilian Journal of Physics. Publicado em: 2007-12
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5. CONSISTENCY IN THREEDIMENSIONAL PERTURBATIVE CALCULATION ON QUANTUM FIELD THEORY: THE QUANTUM ELETRODYNAMICS / CONSISTÊNCIA NO CÁLCULO PERTURBATIVO TRIDIMENSIONAL EM TEORIA QUÂNTICA DE CAMPOS: A ELETRODINÂMICA QUÂNTICA
In this work we present a detailed study about the three-dimensional quantum electro- dynamics QED3, in perturbative solution at the one loop level. A very general method, concerning the manipulations and calculations involving divergent Feynman integrals, alternative to the traditional regularization techniques, is adopted. The basic physical processes are
Publicado em: 2005
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6. CONSISTÊNCIA NO CÁLCULO PERTURBATIVO: A ELETRODINÂMICA QUÂNTICA E A ANOMALIA AVV / CONSISTENCY IN THE PERTURBATIVE CALCULATION: THE QUANTUM ELETRODYNAMIC AND THE AVV ANOMALY
We use a very general calculational method, concerning the divergences manipulations and calculations, in order to treat the perturbative solution of quantum electrodynamics (QED), at the one loop level, as well as to study the perturbative origin of the axial triangle anomaly related with the electromagnetic decay of the neutral pion. Within the context of
Publicado em: 2004
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7. Computation of the sticking probability of a incident atom on metallic surface. / Cálculo da probabilidade de adesão de átomo incidente em superfície metálica.
A new procedure that calculates sticking coefficients for atomic beams incident upon metallic surfaces is discussed. A model Hamiltonian describing the normal incidence of an ad-atom and its interaction with the conduction electrons of the adsorbate is introduced. The Hamiltonian accounts for two couplings: (1) the overlap between the atomic orbital and the
Publicado em: 1986
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8. Mistura de ondas ressonante em absorvedores saturaveis
A study of resonant interactions of two or more waves coupled through population modulation in a saturable absorber (SA) is presented. In the case ot two strong, non collinear waves at equal frequencies, the population in the SA is spatially-modulated and the incident waves are scattered into the various orders of the population grating. A non perturbative r
Publicado em: 1984