Symmetry Breaking
Mostrando 1-12 de 75 artigos, teses e dissertações.
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1. THE SYMMETRY BREAKING PHENOMENON IN 1,2,3-TRIOXOLENE AND C2Y3Z2 (Z= O, S, Se, Te, Z= H, F) COMPOUNDS: A PSEUDO JAHN-TELLER ORIGIN STUDY
1,2,3-Trioxolene (C2O3H2) is an intermediate in the acetylene ozonolysis reaction which is called primary ozonide intermediate. The symmetry breaking phenomenon were studied in C2O3H2 and six its derivatives then oxygen atoms of the molecule are substituted by sulphur, selenium, tellurium (C2Y3H2) and hydrogen ligands are replaced with fluorine atoms (C2Y3F2
Quím. Nova. Publicado em: 2017-06
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2. Padrões de Turing em sistemas químicos
Spontaneous pattern formation in reaction-diffusion systems was theoretically proposed by Alan M. Turing in 1952. His breakthrough conceptions of chemical self-organization were able to explain how patterns emerge in nature and the symmetry breaking, which are of utmost importance, for instance, in the context of origin of life. Along with the experimental o
Quím. Nova. Publicado em: 2016-05
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3. Problemas de corte com sobras aproveitáveis e eliminação de simetrias / Cutting stock problems with usable leftover and symmetry breaking
In this work we study two variations of the packing problem where identical rectangular items must be packed into a polyhedron. One of the variations consists in finding the largest amount of rectangular items that can fit in a polyhedron. The other one consists in finding a minimal area polyhedron of a certain type that packs a set of rectangular identical
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/09/2012
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4. Fenomenologia dos decaimentos de neutrinos de supernova / Decay phenomenology of supernova neutrinos
Here we present a study of the phenomenology of neutrinos, which starts with a model beyond the Standard Model, which generates mass and decay to neutrinos. The model was proposed by Gelmini and Roncadelli cite Gelmini: 1981, the model needs a triplet that interacts with the scaling doublet Higgs through different potential climb. The triplet also interacts
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/11/2011
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5. Geometria e simetrias do emaranhamento
In the present work we present a geometric method to identify and measure the degree of entanglement of a two-qubit state. It is based on writing a map of the system state, from a non-unitary transformation. By introducing new parameters for such 4X4 matrix, the product of eigenvalues, two by two, acquire the form of squared 4D distances, having a Minkowski
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/05/2011
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6. Effects of spontaneous symmetry breaking-CPT and Lorentz invariance of the phenomenon the Bose-Einstein / Efeitos da quebra espontânea da simetria-CPT e da invariância de Lorentz no fenômeno da condensação de Bose-Einstein
The Bose-Einstein condensate (BEC), also known as the fifth state of the matter, was predicted theoretically by Albert Einstein in 1925 and verified experimentally 70 years later in 1995. This dissertation addresses the effects of spontaneous broken of the CPT-symmetry and of the invariance Lorentz (also called simply the violation of Lorentz symmetry) in th
Publicado em: 2011
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7. A natureza tricrítica da fase nemática
The phenomenona of critical phases are very important topic of conceptual point of view, mainly by breaking paradigms of modern theories of critical phenomena. These phenomena can be suggested by mechanisms of spontaneous breaking of continumm symmetry - well established model in particle physics - where there is the appearance of Nambu-Goldstone Bosons lead
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/02/2010
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8. Evolução biomolecular homoquiral: a origem e a amplificação da quiralidade nas moléculas da vida
The fact that biologically relevant molecules exist only as one of the two enantiomers is a fascinating example of complete symmetry breaking of chirality and has long intrigued our curiosity. The origin of this selective chirality has remained a fundamental enigma with regard to the origin of life since the time of Pasteur, 160 years ago. The symmetry break
Química Nova. Publicado em: 2010
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9. Guias de onda com um ambiente para testes de uma eletrodinâmica com violação das simetrias de Lorentz e CPT / Waveguides as a way of testing an electrodynamics with broken Lorentz and CPT symmetries
We study a CPT- and Lorentz-odd electrodynamics in (3+1) dimensions, obtained by adding a Chern-Simons-like term to the usual Maxwell model, as described by the radiation sector of the Standard Model Extension. Once this term is proportional to a constant background "4-vector", (kAF), wich selects a preferred direction in the spacetime (breaking its isotropy
Publicado em: 2010
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10. Quebra da simetria de Lorentz na eletrodinâmica quântica / Lorentz symmetry breaking in quantum electrodynamics
Nesta dissertação, estudamos implicações geradas pela quebra da simetria de Lorentz na Eletrodinâmica Quântica. Analisamos férmions interagindo com um campo eletromagnético nos contextos da mecânica quântica e ao efetuar correções radiativas. Na mecânica quântica, os termos de quebra da simetria de Lorentz foram tratados como perturbações à
Publicado em: 2010
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11. Efeitos de desordem e localização eletrônica em bicamada de grafeno / Effects of disorder and electronic localization in bilayer graphene
Nós estudamos os efeitos da quebra de simetria e de desordem no espectro de energia de um elétron numa bicamada de grafeno. O problema foi abordado através de simulações numéricas considerando um Hamiltoniano tight-binding para uma rede retangular topologicamente equivalente à rede hexagonal do grafeno que nos permite incluir de forma simples os efeit
Publicado em: 2010
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12. Sinais de produção de novos bósons vetoriais no LHC / Signals of production of new vector bosons at the LHC
In this work we performed a phenomenological observation of new spin-1 bosons associated with the Electroweak Symmetry Breaking sector. As motivation for this analysis we previously studied the special case of models based on the mechanism of Eletroweak Symmetry Breaking via Boundary Conditions, which also have a tower vector of Kaluza-Klein bosons ensuring
Publicado em: 2009