4,418 research outputs found

    Spinors Fields in Co-dimension One Braneworlds

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    In this work we analyze the zero mode localization and resonances of 1/2āˆ’1/2-spin fermions in co-dimension one Randall-Sundrum braneworld scenarios. We consider delta-like, domain walls and deformed domain walls membranes. Beyond the influence of the spacetime dimension DD we also consider three types of couplings: (i) the standard Yukawa coupling with the scalar field and parameter Ī·1\eta_1, (ii) a Yukawa-dilaton coupling with two parameters Ī·2\eta_2 and Ī»\lambda and (iii) a dilaton derivative coupling with parameter hh. Together with the deformation parameter ss, we end up with five free parameter to be considered. For the zero mode we find that the localization is dependent of DD, because the spinorial representation changes when the bulk dimensionality is odd or even and must be treated separately. For case (i) we find that in odd dimensions only one chirality can be localized and for even dimension a massless Dirac spinor is trapped over the brane. In the cases (ii) and (iii) we find that for some values of the parameters, both chiralities can be localized in odd dimensions and for even dimensions we obtain that the massless Dirac spinor is trapped over the brane. We also calculated numerically resonances for cases (ii) and (iii) by using the transfer matrix method. We find that, for deformed defects, the increasing of DD induces a shift in the peaks of resonances. For a given Ī»\lambda with domain walls, we find that the resonances can show up by changing the spacetime dimensionality. For example, the same case in D=5D=5 do not induces resonances but when we consider D=10D=10 one peak of resonance is found. Therefore the introduction of more dimensions, diversely from the bosonic case, can change drastically the zero mode and resonances in fermion fields.Comment: 28 pages, 7 figure

    Pesos e relaƧƵes de pesos de bezerros Canchim e Nelore.

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    Os pesos ao nascimento; A desmama (PD, 210 dias); Ganho diĆ”rio de peso do nascimento a desmam (GND), as relaƧƵes PD/peso da va e PD/idade da vaca ao parto e peso de bezerro a desmama pro vaca em reproduĆ§Ć£o, de bezerros das raƧas Canchim e Nelore

    Desempenho produtivo de fĆŖmeas das raƧas Canchim e Nelore. V. Desenvolvimento dos bezerros.

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    Foram estudados os pesos ao nascimento e a desmama, o ganho diĆ”rio de peso do nascimento a desmama, as relaƧƵes peso da vaca e idade da vaca ao parto e peso de bezerro a desmama por vaca em reproduĆ§Ć£o, de animais das raƧas Canchim e Nelore, filhos de vacas criadas juntas em regime exclusivo de pasto

    FormaĆ§Ć£o de novas raƧas de bovinos de corte.

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    UtilizaĆ§Ć£o do cruzamento entre raƧas; Novas raƧas; Desenvolvimento de novas raƧas; RaƧas sinteticas no Brasil
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