Soft supersymmetry breaking in the nonlinear sigma model

In this work we discuss the dynamical generation of mass in a deformed ${\cal N}=1$ supersymmetric nonlinear sigma model in a two-dimensional ($D=1+1$) space-time. We introduce the deformation by imposing a constraint that softly breaks supersymmetry. Through the tadpole method, we compute the effective potential at leading order in $1/N$ expansion showing that the model exhibit a dynamical generation of mass to the matter fields. Supersymmetry is recovered in the limit of the deformation parameter going to zero.Comment: 9 pages, 2 figures. Revised version. arXiv admin note: text overlap with arXiv:1308.471

Qualidade fisiológica de sementes de arroz armazenadas em diferentes embalagens e temperaturas.

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Displacement Echoes: Classical Decay and Quantum Freeze

Motivated by neutron scattering experiments, we investigate the decay of the fidelity with which a wave packet is reconstructed by a perfect time-reversal operation performed after a phase space displacement. In the semiclassical limit, we show that the decay rate is generically given by the Lyapunov exponent of the classical dynamics. For small displacements, we additionally show that, following a short-time Lyapunov decay, the decay freezes well above the ergodic value because of quantum effects. Our analytical results are corroborated by numerical simulations

Rendimento de grãos de trigo e tricale com utilização de torta de mamona.

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Astragaline levels in creole and breeding lines of common bean from Rio Grande do Sul State, Brazil.

Made available in DSpace on 2013-03-28T23:35:51Z (GMT). No. of bitstreams: 1 Digitalizar0010.pdf: 159228 bytes, checksum: c470b4575bc96dcf40ab996d96fc2f9f (MD5) Previous issue date: 2013-03-28201

Indicações técnicas para produção de sementes de plantas recuperadoras de solo para a agricultura familiar.

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Incidência de fungos e desempenho de sementes de mamona.

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Curva de embebição de sementes de repolho submetidas a envelhecimento artificial.

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