On the Viability of Minimal Neutrinophilic Two-Higgs-Doublet Models

We study the constraints that electroweak precision data can impose, after the discovery of the Higgs boson by the LHC, on neutrinophilic two-Higgs-doublet models which comprise one extra $SU(2)\times U(1)$ doublet and a new symmetry, namely a spontaneously broken $\mathbb{Z}_2$ or a softly broken global $U(1)$. In these models the extra Higgs doublet, via its very small vacuum expectation value, is the sole responsible for neutrino masses. We find that the model with a $\mathbb{Z}_2$ symmetry is basically ruled out by electroweak precision data, even if the model is slightly extended to include extra right-handed neutrinos, due to the presence of a very light scalar. While the other model is still perfectly viable, the parameter space is considerably constrained by current data, specially by the $T$ parameter. In particular, the new charged and neutral scalars must have very similar masses.Comment: 22 pages, 3 figures, references and comments added, conclusions unchanged, matches version to appear in JHE

Survival of branching random walks in random environment

We study survival of nearest-neighbour branching random walks in random environment (BRWRE) on ${\mathbb Z}$. A priori there are three different regimes of survival: global survival, local survival, and strong local survival. We show that local and strong local survival regimes coincide for BRWRE and that they can be characterized with the spectral radius of the first moment matrix of the process. These results are generalizations of the classification of BRWRE in recurrent and transient regimes. Our main result is a characterization of global survival that is given in terms of Lyapunov exponents of an infinite product of i.i.d. $2\times 2$ random matrices.Comment: 17 pages; to appear in Journal of Theoretical Probabilit

Collection of relevant results obtained with the Skylab images by the Institute for Space Research, INPE

There are no author-identified significant results in this report

Lagrangian formulation of classical fields within Riemann-Liouville fractional derivatives

The classical fields with fractional derivatives are investigated by using the fractional Lagrangian formulation.The fractional Euler-Lagrange equations were obtained and two examples were studied.Comment: 9 page

Calagem no desenvolvimento inicial do guanandi em condições de vaso.

O interesse pelo plantio comercial de espécies nativas madeireiras no Brasil é crescente nos últimos anos. Para as espécies nativas brasileiras não existe um protocolo para o manejo da fertilidade do solo. O objetivo deste trabalho foi avaliar, em casa-de-vegetação, os efeitos de doses de calcário no desenvolvimento de mudas de guanandi (Calophyllum brasiliense Cambess.). Foram avaliados cinco níveis de saturação por bases em delineamento experimental inteiramente ao acaso com quatro repetições sendo cada parcela constituída por uma planta. O solo utilizado foi um Latossolo Vermelho distrófico textura argilosa coletado na camada 0 a 20 cm no campo experimental da Embrapa em Ponta Grossa, PR. As doses de calcário foram calculadas para elevar a saturação por bases (V%) a 25, 50, 75 e 100%, além do valor original do solo. Aos 8 meses após a implantação do ensaio, foram avaliados: altura e matéria seca das partes aérea e radicular das mudas. A resposta do guanandi à calagem varia conforme a característica biométrica considerada. O guanandi não tolera níveis elevados de saturação por bases.Resumo expandido