Towards Relativistic Skyrmions

We revisit baryons in the Skyrme model. Starting from static baryons in the helicity eigenstates, we generalize their wavefunctions to the non-static and relativistic regime. A new representation for gamma matrices in the soliton collective space is constructed and the corresponding Dirac equation is obtained. As an example, we draw consideration on how to apply this new representation on the calculus of vector current vacuum expectation values for baryon states of spin and isospin half and arbitrary momenta and we show how elastic form factors can be derived.Comment: 7 pages, 7th Conference Mathematical Methods in Physics - Londrina 2012, Rio de Janeiro, Brazi

Generalized baryon form factors and proton structure functions in the Sakai-Sugimoto model

We investigate the production of positive parity baryon resonances in proton electromagnetic scattering within the Sakai-Sugimoto model. The latter is a string model for the non-perturbative regime of large $N_c$ QCD. Using holographic techniques we calculate the generalized Dirac and Pauli form factors that describe resonance production. We use these results to estimate the contribution of resonance production to the proton structure functions. Interestingly, we find an approximate Callan-Gross relation for the structure functions in a regime of intermediate values of the Bjorken variable.Comment: v3: 38 pages, 25 figures. We added a new subsection in order to compare our results with experimental data. To appear in Nucl. Phys.

Production of negative parity baryons in the holographic Sakai-Sugimoto model

We extend our investigation of resonance production in the Sakai-Sugimoto model to the case of negative parity baryon resonances. Using holographic techniques we extract the generalized Dirac and Pauli baryon form factors as well as the helicity amplitudes for these baryonic states. Identifying the first negative parity resonance with the experimentally observed S_{11}(1535), we find reasonable agreement with experimental data from the JLab-CLAS collaboration. We also estimate the contribution of negative parity baryons to the proton structure functions.Comment: 1+30 pages, 8 figures. v3: typos corrected, references added, section 2 and 3 shortened, improved discussion of helicity amplitudes and comparison with experimental result

Hybrid seed production via stored pollen grains from tomato inbred lines: interactions among temperature and storage time and their effects on pollen viability.

Abstract 92

Relativistic baryons in the Skyrme model revisited

Starting from the static Skyrme model baryon wavefunctions in their helicity eigenstates, we generalize the wavefunctions to the non-static and relativistic regime. A new representation for gamma matrices in the SU(2) collective space is constructed and the corresponding Dirac equation is obtained. Finally, we comment on possible applications of our results to the calculation of matrix elements of baryonic currents and the corresponding form factors in the relativistic case

Competitividade do etanol em áreas tradicional e de expansão na região centro-sul.

A cadeia do agronegócio da cana-de-açúcar é uma das que mais tem contribuído para o crescimento econômico do Brasil, na safra de 2010-2011 foi plantado 8,1 milhões de hectares produzindo 28 bilhões de litros de etanol e para a safra de 2011-2012 a previsão é de 33 bilhões de litros de etanol, elevando o Brasil como o maior produtor mundial de etanol. Este trabalho tem como objetivo verificar a competitividade do etanol brasileiro através da Matriz de Análise Política- MAP considerando uma área de cultivo tradicional e outra área de expansão da cana-de-açúcar. O instrumental utilizado para essa análise foi a Matriz de Análise de Política - MAP desenvolvida por Monke e Pearson (1989), os resultados mostram que as lucratividades privada e social foram positivos, indicando competitividade e eficiência econômica, respectivamente, para as duas cadeias. A cadeia do etanol em área tradicional foi a mais competitiva e com maior eficiência econômica por apresentar maior valor em ambas lucratividades. As transferências associadas à produção para as cadeias apresentaram valores positivos. O maior valor positivo na cadeia da área de tradicional reflete os altos preços ou receitas privadas nessa cadeia, indicando que há transferência positiva da sociedade para o setor produtor