Anicut systems in Sri Lanka: The case of the Upper Walawe River Basin

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Spontaneous CP violation in the 3-3-1 model with right-handed neutrinos

We implement the mechanism of spontaneous CP violation in the 3-3-1 model with right-handed neutrinos and recognize their sources of CP violation. Our main result is that the mechanism works already in the minimal version of the model and new sources of CP violation emerges as an effect of new physics at energies higher than the electroweak scale.Comment: Major changes in the quark sector, electronic dipole moment of the neutron was evaluated, accepted for publication in the physical review

Majorana Dark Matter in Minimal Higgs Portal Models after LUX

We consider the Singlet Majorana fermion dark matter model, in which the standard model particles interact with the dark sector through the mixing of a singlet scalar and the Higgs boson. In this model both the dark matter and the singlet scalar carry lepton number, the latter being a bilepton. We suppose the existence of a $Z_2$ symmetry, remnant of some high energy local symmetry breaking, that stabilizes the Majorana fermion. We analyzed the parameter space of this model and found that the lepton number symmetry breaking scale, drove by the singlet scalar, is constrained to be within hundreds to thousands of GeV, so as to conform with the observed dark matter relic density. Finally, we address the direct detection and invisible Higgs decay complementarity, confronting our model with recent LUX and LHC constraints, as well as XENON1T prospects.Comment: 20 pages, 12 figure

Neutrino Mixing and the Minimal 3-3-1 Model

In the minimal 3-3-1 model charged leptons come in a non-diagonal basis. Moreover the Yukawa interactions of the model lead to a non-hermitian charged lepton mass matrix. In other words, the minimal 3-3-1 model presents a very complex lepton mixing. In view of this we check rigorously if the possible textures of the lepton mass matrices allowed by the minimal 3-3-1 model can lead or not to the neutrino mixing required by the recent experiments in neutrino oscillation.Comment: two references add, minor chages, accepted for publication in MPL

Realizing the supersymmetric inverse seesaw model in the framework of R-parity violation

If, on one hand, the inverse seesaw is the paradigm of TeV scale seesaw mechanism, on the other it is a challenge to find scenarios capable of realizing it. In this work we propose a scenario, based on the framework of R-parity violation, that realizes minimally the supersymmetric inverse seesaw mechanism. In it the energy scale parameters involved in the mechanism are recognized as the vacuum expectation values of the scalars that compose the singlet superfields $\hat N^C$ and $\hat S$. We develop also the scalar sector of the model and show that the Higgs mass receives a new tree-level contribution that, when combined with the standard contribution plus loop correction, is capable of attaining $125$GeV without resort to heavy stops.Comment: Minor modification of the text. Final version to be published in PL

Inverse type II seesaw mechanism and its signature at the LHC and ILC

The advent of the LHC, and the proposal of building future colliders as the ILC, both programmed to explore new physics at the TeV scale, justifies the recent interest in studying all kind of seesaw mechanisms whose signature lies on such energy scale. The natural candidate for this kind of seesaw mechanism is the inverse one. The conventional inverse seesaw mechanism is implemented in an arrangement involving six new heavy neutrinos in addition to the three standard ones. In this paper we develop the inverse seesaw mechanism based on Higgs triplet model and probe its signature at the LHC and ILC. We argue that the conjoint analysis of the LHC together with the ILC may confirm the mechanism and, perhaps, infer the hierarchy of the neutrino masses.Comment: 24 pages, 22 figure

Índice de sustentabilidade do uso da água de cisternas no semi-árido brasileiro.

A disponibilidade hídrica no Semi-Árido brasileiro é baixa, embora, nos anos secos possam ocorrer, no mínimo, 300,Omm, que são suficientes para abastecer uma cisterna com capacidade de 16.000 litros e atender as necessidades básicas de uma família com cinco pessoas. Nesta região, a quantidade e a qualidade da água são indicadores que devem ser considerados na gestão sustentável da água, principalmente para consumo das famílias. Assim, este estudo avaliou os resultados obtidos pelo P1 MC/Ministério do Desenvolvimento Social - MDS, objetivando propor um índice de sustentabilidade do uso da água de cisterna. Foram utilizados procedimentos de análise fatorial em componentes principais e de agrupamento, integrando-se diferentes bases dados. A partir das variáveis analisadas foram definidos quatro indicadores de sustentabilidade da água das cisternas: a) uso da água de outras fontes; b) condições ecológicas dos domicílios; c) capacitação comunitária e d) qualidade da água. Os indicadores poderão auxiliar no monitoramento e gestão da água, no que concerne ao fornecimento da água necessária e sua qualidade, visando à melhoria da qualidade de vida dos usuários das cisternas. Os indicadores propostos poderão auxiliar na decisão dos gestores do P1 MC no sentido de revisar e reformular suas ações estratégias