4,418 research outputs found
Spinors Fields in Co-dimension One Braneworlds
In this work we analyze the zero mode localization and resonances of
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 we also consider three
types of couplings: (i) the standard Yukawa coupling with the scalar field and
parameter , (ii) a Yukawa-dilaton coupling with two parameters
and and (iii) a dilaton derivative coupling with parameter .
Together with the deformation parameter , we end up with five free parameter
to be considered. For the zero mode we find that the localization is dependent
of , 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 induces a shift in the
peaks of resonances. For a given with domain walls, we find that the
resonances can show up by changing the spacetime dimensionality. For example,
the same case in do not induces resonances but when we consider
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
RelaĆ§Ć£o entre produĆ§Ć£o de leite da vaca e desempenho do bezerro das raƧas Canchim e Nelore.
Estudos dos efeitos da produĆ§Ć£o de leite de vacas primiparas das raƧas Canchim e Nelore, sobre o desenvolvimento dos bezerros do nascimento a desmama
Pesos e relaƧƵes de pesos de bezerros Canchim e Nelore.
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.
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.
UtilizaĆ§Ć£o do cruzamento entre raƧas; Novas raƧas; Desenvolvimento de novas raƧas; RaƧas sinteticas no Brasil
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