Abelian varieties isogenous to a power of an elliptic curve over a Galois extension

Given an elliptic curve $E/k$ and a Galois extension $k'/k$, we construct an exact functor from torsion-free modules over the endomorphism ring ${\rm End}(E_{k'})$ with a semilinear ${\rm Gal}(k'/k)$ action to abelian varieties over $k$ that are $k'$-isogenous to a power of $E$. As an application, we show that every elliptic curve with complex multiplication geometrically is isogenous over the ground field to one with complex multiplication by a maximal order.Comment: 6 pages, added reference

Uncertainty under a multivariate nested-error regression model with logarithmic transformation

Assuming a multivariate linear regression model with one random factor, we consider the parameters defined as exponentials of mixed effects, i.e., linear combinations of fixed and random effects. Such parameters are of particular interest in prediction problems where the dependent variable is the logarithm of the variable that is the object of inference. We derive bias-corrected empirical predictors of such parameters. A second order approximation for the mean crossed product error of the predictors of two of these parameters is obtained, and an estimator is derived from it. The mean squared error is obtained as a particular case

Review of Renatus’ Kayak: A Labrador Inuk, an American G.I. and a Secret World War II Weather Station by Rozanne Enerson Junker

Review of Renatus’ Kayak: A Labrador Inuk, an American G.I. and a Secret World War II Weather Station by Rozanne Enerson Junker

The Distorted Lens: Immigrant Maladies and Mythical Norms in Edwidge Danticat’s Breath, Eyes, Memory

The immigrant experience is riddled with the complexities of uprooting, and the challenges of fitting into a new environment where the issue of difference plays an important role. An immigrant’s life is multireferential in terms of how he or she views difference and is viewed as different. Haitian-American writer Edwidge Danticat’s first novel, Breath, Eyes, Memory has instances of extreme disfunctionality due to the interplay of past experiences in Haiti and new encounters in New York City, and it includes many scenes in which characters express and negotiate different sets of cultural expectations, trying to reconcile their differences. [excerpt

Opening borders!

On the centenay of Yehudi Menuhin we want to enlighten his role in rescuing artistic practices of cultural minorities and its contributions to fight against violence, racism and xenophobia at european schools and communities. We discuss our research artistic action in the last 20 years through the MUS-E program in Portugal, focus on Évora multicultural neighborhood.FC

Search for ttˉHt\bar{t}H and tHtH production with H→γγH\to \gamma \gamma at s\sqrt{s} = 13 TeV with the ATLAS experiment

The measurement of the Yukawa coupling of the top quark is one important goal of particle physics after the discovery of the Higgs boson. There are two processes that offer the possibility to directly measure the Yukawa coupling of the top quark at the LHC. These are the production of a top-antitop-quark pair in association with a Higgs boson via the strong interaction ($t\bar{t}H$) and the electroweak production of a single top quark and a Higgs boson ($tH$). In the Standard Model, the cross section for $tH$ production is much smaller than the cross section for $t\bar{t}H$ production as there is a destructive interference between diagrams where the Higgs boson is radiated off a top quark and diagrams where it is radiated off a $W$ boson. Despite the reduced cross section, this interference provides additional sensitivity to the sign of the Yukawa coupling. The considered Higgs boson decay into photons is promising due to the good energy resolution of the photons and the relatively small backgrounds. But it is also challenging due to the small branching ratio. The analysis strategy and the latest results on the search for $t\bar{t}H/tH$ production in the diphoton channel at the ATLAS experiment are presented.Comment: 4 pages, 2 figures, TOP2017 conferenc

Review of Roots of Entanglement: Essays in the History of Native-Newcomer Relations edited by Myra Rutherdale, Kerry Abel and P. Whitney Lackenbauer

Review of Roots of Entanglement: Essays in the History of Native-Newcomer Relations edited by Myra Rutherdale, Kerry Abel and P. Whitney Lackenbaue

Prices and production cost in aluminium smelting in the short and the long run

The main objective of this work is to reflect the structural changes that have characterized the aluminium industry over the last few decades. I order to capture the changes in competition I have estimated cost and related it to output prices by illustrating the effect of the prevalent industry risk sharing agreements. I argue that, contrary to what the microeconomic paradigm envisages, in the short run prices mainly determine costs as the consequence of a an exchange pricing system involving contractual risk-sharing arrangements. Costs determine prices only in the long run through investment in new smelting capacity. Previous studies of the aluminium industry had often used unreliable measures of weighted average variable cost. The main contribution of this work lies on the estimation of cost applying the flexible translog framework to a unique set of proprietary data