18 research outputs found
Localized Fermions and Anomaly Inflow via Deconstruction
We study fermion localization in gauge theory space. We consider four
dimensional product gauge groups in which light chiral fermions transform under
different gauge factors of the product group. This construction provides a
suppression of higher dimensional operators. For example, it can be used to
suppress dangerous proton decay operators. The anomalies associated with the
light chiral fermions are compensated by Wess-Zumino terms, which in the
continuum limit reproduce the five dimensional Chern-Simons term.Comment: 12 pages, minor changes to section
Charged lepton electric dipole moments with the localized leptons and the new Higgs doublet in the two Higgs doublet model
We study the lepton electric dipole moments in the split fermion scenario, in
the two Higgs doublet model, where the new Higgs scalars are localized around
the origin in the extra dimension, with the help of the localizer field. We
observe that the numerical value of the electron (muon, tau) electric dipole
moment is at the order of the magnitude of 10^{-31} (10^{-24}, 10^{-22}) (e-cm)
and this quantity is sensitive the new Higgs localization in the extra
dimension.Comment: 20 pages, 7 figure
EmissĂŁo de Ăłxidos de nitrogĂȘnio associada Ă aplicação de urĂ©ia sob plantio convencional e direto Nitrogen oxides emission related to urea broadcasting fertilization under conventional and no-tillage systems
O objetivo deste trabalho foi avaliar emissĂ”es de NO e N2O atĂ© cinco dias apĂłs a primeira fertilização de cobertura com urĂ©ia em milho, em Latossolo Vermelho argiloso distrĂłfico, sob plantio convencional e direto. A adubação de cobertura foi de 60 kg ha-1 de N. O experimento foi conduzido na Embrapa Cerrados, Planaltina, DF, com delineamento de blocos ao acaso, com trĂȘs repetiçÔes, sendo o terceiro cultivo de milho, em rotação com soja. Os fluxos de NO e N2O foram medidos em cĂąmaras de PVC instaladas em cada parcela. Houve emissĂŁo alta de NO imediatamente apĂłs (5,4 ng N cm-2 h-1) e no terceiro dia (4,8 ng N cm-2 h-1) apĂłs aplicação de urĂ©ia e irrigação. Um dia apĂłs fertilização, a emissĂŁo de NO reduziu-se a 1,9 ng N cm-2 h-1, e cinco dias depois, alcançou 1,2 ng N cm-2 h-1. Os fluxos de N2O ficaram abaixo do limite de detecção de 0,6 ng N cm-2 h-1. NĂŁo houve diferença significativa entre os plantios convencional e direto quanto Ă emissĂŁo dos Ăłxidos de nitrogĂȘnio.<br>The objective of this work was to evaluate the NO and N2O emissions up to five days after the first nitrogen broadcasting fertilization with urea in a cornfield, in a Red Latosol, under conventional and no-tillage systems. The level of nitrogen broadcasting fertilization was of 60 kg ha-1. The experiment was conducted at Embrapa Cerrados, Planaltina, DF, Brazil, in a randomized block design, with three replications, beeing the third corn crop in rotation with soybean. NO and N2O fluxes were measured using PVC chambers installed in each plot. Higher NO fluxes were found immediately after (5.4 ng N cm-2 h-1) and three days (4.8 ng N cm-2 h-1) after N fertilization and irrigation. In the first day after fertilization, the NO emission decreased significantly to 1.9 ng N cm-2 h-1, and after five days, reached 1.2 ng N cm-2 h-1. N2O fluxes values were below the detection limit of 0.6 ng N cm-2 h-1. No significant differences in nitrogen oxides fluxes were found between plots under conventional and no-tillage systems