19 research outputs found
A Langevin equation for high energy evolution with pomeron loops
We show that the Balitsky-JIMWLK equations proposed to describe non-linear
evolution in QCD at high energy fail to include the effects of fluctuations in
the gluon number, and thus to correctly describe both the low density regime
and the approach towards saturation. On the other hand, these fluctuations are
correctly encoded (in the limit where the number of colors is large) in
Mueller's color dipole picture, which however neglects saturation. By combining
the dipole picture at low density with the JIMWLK evolution at high density, we
construct a generalization of the Balitsky hierarchy which includes the
particle number fluctuations, and thus the pomeron loops. After an additional
coarse-graining in impact parameter space, this hierarchy is shown to reduce to
a Langevin equation in the universality class of the stochastic
Fisher-Kolmogorov-Petrovsky-Piscounov (sFKPP) equation. This equation implies
that the non-linear effects in the evolution become important already in the
high momentum regime where the average density is small, which signals the
breakdown of the BFKL approximation.Comment: 56 pages, 10 figure
Prendersi cura della generativitĂ ,genitorialitĂ e cogenitorialitĂ con gli operatori socio-sanitari per una profilassi psicoeducativa
Desempenho produtivo e qualidade da carne de frangos alimentados com ração contendo óleo de linhaça
Desempenho e perfil sĂ©rico bioquĂmico de frangos de corte alimentados com raçÔes contendo produtos homeopĂĄticos
Herança da senescĂȘncia retardada em milho Inheritance of the delayed senescence in maize
O objetivo deste trabalho foi estudar a herança da senescĂȘncia retardada em milho. Foram realizados cruzamentos dialĂ©licos parciais entre 50 linhagens e cinco testadores. Os 250 cruzamentos resultantes, alĂ©m de seis hĂbridos comerciais utilizados como testemunhas, foram avaliados em oito ambientes, no delineamento lĂĄtice simples 16x16, com duas repetiçÔes por ambiente. Os cruzamentos dialĂ©licos foram analisados utilizando o mĂ©todo 4 do modelo 1 de Griffing, adaptado para mĂșltiplos ambientes. A contribuição da capacidade geral de combinação (CGC) para a expressĂŁo do carĂĄter "stay-green" (69,06%) foi maior que a da capacidade especĂfica de combinação (CEC) (30,94%), evidenciando que os efeitos aditivos sĂŁo mais importantes que os efeitos nĂŁo aditivos na expressĂŁo deste carĂĄter. Tanto a CGC como a CEC interagiram significativamente com o ambiente, indicando que a seleção para este carĂĄter deve ser realizada com base nas mĂ©dias de experimentos em diversos ambientes.<br>The objective of this research was to study the inheritance of delayed senescence in maize. Partial diallel crosses among 50 inbred lines and five testers were made. The 250 crosses, along with six commercial hybrids used as checks, were evaluated at eight environments in lattices 16x16 with two replications per environment. The diallel crosses were analyzed following the method 4 model 1 of Griffing, extended to multiple environments. The contribution of the general combining ability (CGA) for the expression of the stay-green trait (69.06%) was greater than the specific combining ability (SCA) (30.94%), showing that additive effects are more important than non-additive effects for the expression of this trait. Both GCA and SCA interacted significantly with the environments, indicating that the selection for this trait should be based on the means across environments