10,133 research outputs found
Effective coupling between two Brownian particles
We use the system-plus-reservoir approach to study the dynamics of a system
composed of two independent Brownian particles. We present an extension of the
well-known model of a bath of oscillators which is capable of inducing an
effective coupling between the two particles depending on the choice made for
the spectral function of the bath oscillators. The coupling is non-linear in
the variables of interest and an exponential dependence on these variables is
imposed in order to guarantee the translational invariance of the model if the
two particles are not subject to any external potential. The effective
equations of motion for the particles are obtained by the Laplace transform
method and besides recovering all the local dynamical properties for each
particle we end up with an effective interaction potential between them. We
explicitly analyze one of its possible forms.Comment: 4 pages, 1 figur
Majorana neutrino decay in an Effective Approach
The search strategy or the finding of new effects for heavy neutrinos often
relies on their different decay channels to detectable particles. In particular
in this work we study the decay of a Majorana neutrino with interactions
obtained from an effective general theory modeling new physics at the scale
. The results obtained are general because they are based in an
effective theory and not in specific models. We are interested in relatively
light heavy Majorana neutrinos, with masses lower than the mass
(). This mass range simplifies the study by reducing the possible
decay modes. Moreover, we found that for TV, the neutrino
plus photon channel could give explanation to different observations: we
analyze the potentiality of the studied interactions to explain some
neutrino-related problems like the MiniBooNE and SHALON anomalies. We show in
different figures the dominant branching ratios and the decay length of the
Majorana neutrino in this approach. This kind of heavy neutral leptons could be
searched for in the LHC with the use of displaced vertices techniques. \Comment: 15 page, 5 figure
Gluon and Ghost Dynamics from Lattice QCD
The two point gluon and ghost correlation functions and the three gluon
vertex are investigated, in the Landau gauge, using lattice simulations. For
the two point functions, we discuss the approach to the continuum limit looking
at the dependence on the lattice spacing and volume. The analytical structure
of the propagators is also investigated by computing the corresponding spectral
functions using an implementation of the Tikhonov regularisation to solve the
integral equation. For the three point function we report results when the
momentum of one of the gluon lines is set to zero and discuss its implications.Comment: Proceedings of Light Cone 2016, held in Lisbon, September 2016. Minor
changes in text. To appear in Few B Sy
The Elephant Quantum Walk
We explore the impact of long-range memory on the properties of a family of
quantum walks in a one-dimensional lattice and discrete time, which can be
understood as the quantum version of the classical "Elephant Random Walk"
non-Markovian process. This Elephant Quantum Walk is robustly superballistic
with the standard deviation showing a constant exponent, , whatever the quantum coin operator, on which the diffusion coefficient is
dependent. On the one hand, this result indicates that contrarily to the
classical case, the degree of superdiffusivity in quantum non- Markovian
processes of this kind is mainly ruled by the extension of memory rather than
other microscopic parameters that explicitly define the process. On the other
hand, these parameters reflect on the diffusion coefficient.Comment: 4 figures, any comments is welcome. Accepted in PR
Orientações tecnicas para o cultivo do maracuja em Roraima.
Solo e clima. Variedades. Formacao de mudas. Etapas do plantio. Tratos culturais. Pragas e doencas. Colheita e embalagem.bitstream/item/131653/1/maracujaCIT.pd
A cultura do abacateiro.
Origem. Botanica. Variedades. Clima e solo. Propagacao e formacao do pomar. Tratos culturais e adubacao. Pragas e doencas. Colheita, comercializacao e utilizacao. Rendimento.bitstream/item/131654/1/abacateiroCIT.pd
A cultura da acerola para o Estado de Roraima.
Clima. Solos. Cultivares. Propagacao. Plantio. Irrigacao. Controle de invasoras. Poda. Adubacao de manutencao. Controle de pragas e doencas. Colheita. Importancia social.bitstream/item/131649/1/AcerolaCIT.pd
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