Scaling treatment of the random field Ising model

Analytic phenomenological scaling is carried out for the random field Ising model in general dimensions using a bar geometry. Domain wall configurations and their decorated profiles and associated wandering and other exponents $(\zeta,\gamma,\delta,\mu)$ are obtained by free energy minimization. Scaling between different bar widths provides the renormalization group (RG) transformation. Its consequences are (1) criticality at $h=T=0$ in $d \leq 2$ with correlation length $\xi(h,T)$ diverging like $\xi(h,0) \propto h^{-2/(2-d)}$ for $d<2$ and $\xi(h,0) \propto \exp[1/(c_1\gamma h^{\gamma})]$ for $d=2$, where $c_1$ is a decoration constant; (2) criticality in $d = 2+\epsilon$ dimensions at $T=0$, $h^{\ast}= (\epsilon/2c_1)^{1/\gamma}$, where $\xi \propto [(s-s^{\ast})/s]^{-2\epsilon/\gamma}$, $s \equiv h^{\gamma}$. Finite temperature generalizations are outlined. Numerical transfer matrix calculations and results from a ground state algorithm adapted for strips in $d=2$ confirm the ingredients which provide the RG description.Comment: RevTex v3.0, 5 pages, plus 4 figures uuencode

Diversity and distribution of jumping plant-lice (Hemiptera: Psylloidea) along edges of Amazon - Cerrado transitional forests in Sorriso, Mato Grosso, Brazil.

Little is known about the jumping plant-lice of Brazil from where seven families, 45 genera and 76 species have been previously reported, but estimates suggest that there may be as many as 1,000 species. This study reports 34 species of Psylloidea which were collected along the edges of Amazon?Cerrado natural transitional forests in the municipality of Sorriso, state of Mato Grosso, from August 2013 to July 2014. Of the species reported in this study only nine represent described taxa, two of which are reported for the first time from Mato Grosso.hardt et al. 2013; Mazzardo 2014; Mazzardo et al. 2016): the two introduced eucalypt pests Blastopsylla occidentalis and Glycaspis brimblecombei, the three Fabaceae feeders Euphalerus clitoriae, Isogonoceraia divergipennis and Macrocorsa beeryi, the Toona pest Mastigimas anjosi, and the Nectandra psylloid Limataphalara lautereri. To improve the apparent lack of knowledge, a survey of the psylloid fauna of the edges of Amazon?Cerrado native transitional forests was conducted in Sorriso, Mato Grosso, Brazil. Here we present a commented inventory of the species encountered during the dry and rainy seasons

New country, Brazilian states and host records of the eucalypt shoot psyllid Blastopsylla occidentalis.

O psilídeo das ponteiras do eucalipto, Blastopsylla occidentalis Taylor, 1985 (Hemiptera: Psylloidea) é relatado aqui pela primeira vez para o Burundi, Indonésia (Sumatra), Nicarágua, Filipinas e Iêmen. O registro desta para o Paraguai mostrou ser um erro. Novos registros são dados para os estados brasileiros Bahia, Ceará, Piauí e Rio Grande do Sul. Eucalyptus viminalis é listado pela primeira vez como hospedeiro de B. occidentalis.Nota científica

On the connection of Gamma-rays, Dark Matter and Higgs searches at LHC

Motivated by the upcoming Higgs analyzes we investigate the importance of the complementarity of the Higgs boson chase on the low mass WIMP search in direct detection experiments and the gamma-ray emission from the Galactic Center measured by the Fermi-LAT telescope in the context of the $SU(3)_c\otimes SU(3)_L\otimes U(1)_N$. We obtain the relic abundance, thermal cross section, the WIMP-nucleon cross section in the low mass regime and network them with the branching ratios of the Higgs boson in the model. We conclude that the Higgs boson search has a profound connection to the dark matter problem in our model, in particular for the case that ($M_{WIMP} < 60$ GeV) the BR($H \rightarrow 2$ WIMPs) $\gtrsim 90$. This scenario could explain this plateau of any mild excess regarding the Higgs search as well as explain the gamma-ray emission from the galactic center through the $b\bar{b}$ channel with a WIMP in the mass range of 25-45 GeV, while still being consistent with the current limits from XENON100 and CDMSII. However, if the recent modest excesses measured at LHC and TEVATRON are confirmed and consistent with a standard model Higgs boson this would imply that $M_{WIMP} > 60$ GeV, consequently ruling out any attempt to explain the Fermi-LAT observations.Comment: 8 pages, 9 figure

Lepton Flavor Violation and Collider Searches in a Type I + II Seesaw Model

Neutrino are massless in the Standard Model. The most popular mechanism to generate neutrino masses are the type I and type II seesaw, where right-handed neutrinos and a scalar triplet are augmented to the Standard Model, respectively. In this work, we discuss a model where a type I + II seesaw mechanism naturally arises via spontaneous symmetry breaking of an enlarged gauge group. Lepton flavor violation is a common feature in such setup and for this reason, we compute the model contribution to the $\mu \rightarrow e\gamma$ and $\mu \rightarrow 3e$ decays. Moreover, we explore the connection between the neutrino mass ordering and lepton flavor violation in perspective with the LHC, HL-LHC and HE-LHC sensitivities to the doubly charged scalar stemming from the Higgs triplet. Our results explicitly show the importance of searching for signs of lepton flavor violation in collider and muon decays. The conclusion about which probe yields stronger bounds depends strongly on the mass ordering adopted, the absolute neutrino masses and which much decay one considers. In the 1-5 TeV mass region of the doubly charged scalar, lepton flavor violation experiments and colliders offer orthogonal and complementary probes. Thus if a signal is observed in one of the two new physics searches, the other will be able to assess whether it stems from a seesaw framework.Comment: 41 pages, 1 figure, 2 table

Dinâmica populacional de Ctenarytaina spatulata (Hemiptera: Psyllidae) em Eucaluptus grandis com novos registros de ocorrência.

Dentre os fatores físicos que exercem influência sobre os insetos, os mais importantes são a temperatura, a umidade, luz e o vento. Quanto à temperatura, os insetos, de um modo geral, desenvolvem-se melhor em temperaturas próximas a 25o C, podendo, no entanto, viver numa larga faixa de temperaturas. Dentro da faixa favorável, os insetos apresentam estreitas faixas de melhor desenvolvimento. De forma análoga à temperatura, as exigências de água pelos insetos variam muito, principalmente devido seus hábitos alimentares. A luz é um dos fatores limitantes aos seres vivos, podendo influenciar na reprodução, dispersão, emergência, alimentação e escolha do hospedeiro (BRENNAN & WEINBAUM 2001d). O vento, além de afetar a temperatura e umidade do ambiente, auxilia os insetos nos processos de dispersão e migração, principalmente quando procuram novo habitat, para alimentação e reprodução (LARA, 1979)

Avaliação de combinações híbridas de melancia no Submédio São Francisco.

As cultivares de melancia no Brasil apresentam frutos de bom teor de açúcar, mas são pouco produtivas, suscetíveis a doenças (Sphaerotheca fuliginea, Didimella bryoniae e viroses) e têm frutos grandes. Considerando a existência de linhas diplóides e tetraplóides com boa homozigose e que a resistência é monogênica e dominante, foram obtidas combinações híbridas diplóides e triplóides as quais foram avaliadas em 2001 e 2002 no Campo Experimental de Bebedouro, em Petrolina-PE, utilizando-se irrigação por gotejamento no espaçamento de 3 m entre fileiras e 0,80 m entre plantas. Na colheita foram avaliados produção por planta e peso de fruto (kg), teor de sólidos solúveis (°Brix), ocamento da polpa e número de sementes perfeitas nas ombinações triplóides. A maioria das combinações híbridas apresentou mais de dez quilogramas por planta, frutos de 4 a 12 kg e teor de sólidos solúveis acima de 10 °Brix e e, portanto, muito semelhantes às testemunhas. No entanto, algumas combinações híbridas apresentaram ocamento da polpa e sementes perfeitas (combinações triplóides) necessitando continuar a seleção para esses dois caracteres.Suplemento.Edição de Resumos expandidos e palestras do 43. Congresso Brasileiro de Olericultura, Recife, jul. 2003

Smoothly-varying hopping rates in driven flow with exclusion

We consider the one-dimensional totally asymmetric simple exclusion process (TASEP) with position-dependent hopping rates. The problem is solved,in a mean field/adiabatic approximation, for a general (smooth) form of spatial rate variation. Numerical simulations of systems with hopping rates varying linearly against position (constant rate gradient), for both periodic and open boundary conditions, provide detailed confirmation of theoretical predictions, concerning steady-state average density profiles and currents, as well as open-system phase boundaries, to excellent numerical accuracy.Comment: RevTeX 4.1, 14 pages, 9 figures (published version