Gamma Ray Bursts as Cosmological Probes

We discuss the prospects of using Gamma Ray Bursts (GRBs) as high-redshift distance estimators, and consider their use in the study of two dark energy models, the Generalized Chaplygin Gas (GCG), a model for the unification of dark energy and dark matter, and the XCDM model, a model where a generic dark energy fluid like component is described by the equation of state, $p= \omega \rho$. Given that the GRBs range of redshifts is rather high, it turns out that they are not very sensitive to the dark energy component, being however, fairly good estimators of the amount of dark matter in the Universe.Comment: 4 pages, 1 figure, talk presented by P.T.S. at the XV Encontro Nacional De Astronomia e Astrofisica, Lisbon, Portugal, 28-30 July 200

Magnetic quantum phase transitions of the antiferromagnetic J_{1}-J_{2} Heisenberg model

We obtain the complete phase diagram of the antiferromagnetic $J_{1}$-$J_{2}$ model, $0\leq \alpha = J_2/J1 \leq 1$, within the framework of the $O(N)$ nonlinear sigma model. We find two magnetically ordered phases, one with N\' eel order, for $\alpha \leq 0.4$, and another with collinear order, for $\alpha\geq 0.6$, separated by a nonmagnetic region, for $0.4\leq \alpha \leq 0.6$, where a gapped spin liquid is found. The transition at $\alpha=0.4$ is of the second order while the one at $\alpha=0.6$ is of the first order and the spin gaps cross at $\alpha=0.5$. Our results are exact at $N\rightarrow\infty$ and agree with numerical results from different methods.Comment: 4 pages, 5 figure

A Capacity Building for Higher Education ERASMUS+ Project: Strategic Human Resources Management for Southeast Asian Universities (HR4ASIA)

The development and optimization of Higher Education Institutions (HEIs) is becoming more and more important. Consequently, Human Resources Management (HRM) has gained greater prominence in the management of these institutions. Due to the complexity of academic contexts of HEIs, HRM models need to be able to respond to new challenges. These challenges concern selection, motivation and development of their staff. Currently, especially in Southeast Asian countries, Human Resources approaches need to be more efficient and tailored to current labor and societal needs. In order to support Higher Education organizational changes in Southeast Asia, a consortium of 4 institutions from Europe (Spain, Portugal, Italy and Lithuania) and 8 from Asia (Vietnam, Cambodia, Laos and Thailand) lead by the University of Danang (Vietnam), applied to a Capacity Building for Higher Education project under the framework of the Erasmus+ Program. The project “Strategic Human Resources Management for Southeast Asian Universities” (HR4Asia) approved in 2016 and co-funded by the European Commission aims at contributing to Higher Education organizational reform in Southeast Asia by improving HRM at the target HEIs from Cambodia, Lao PDR, Vietnam and Thailand. Each partner has well defined tasks according to the work packages established on the project. This research is focused on the competences that workers need to achieve to have a better performance in the institution. It was necessary to present and deconstruct, among others, the concepts of competence as capacity and competency as performance, to learn how to measure competencies and to manage competency and Human Resources. Staff involved in this project will be able to design and define the competencies model of the structures of each HEI to define the competency model per structure (mapping of organizational competencies and a model of competences of structures). This is one more step to achieve the following final goals: introduce in Southeast Asian HEIs a scheme to developing and implementing innovative HRM approaches, paying attention to transversal and additional skills, such as communication and self-learning. Tailor-made dissemination activities addressing non-partner HEIs, Ministries of Higher Education and other stakeholders will promote the project objectives, paving the way for its sustainability

Displaying desire and distinction in housing

The article discusses the significance of cultural capital for the understanding of the field of housing in contemporary Britain. It explores the relationship between housing and the position of individuals in social space mapped out by means of a multiple correspondence analysis. It considers the material aspects of housing and the changing contexts that are linked to the creation and display of desire for social position and distinction expressed in talk about home decoration as personal expression and individuals' ideas of a `dream house'. It is based on an empirical investigation of taste and lifestyle using nationally representative survey data and qualitative interviews. The article shows both that personal resources and the imagination of home are linked to levels of cultural capital, and that rich methods of investigation are required to grasp the significance of these normally invisible assets to broaden the academic understanding of the field of housing in contemporary culture

DC magnetic field generation in unmagnetized shear flows

The generation of DC magnetic fields in unmagnetized plasmas with velocity shear is predicted for non relativistic and relativistic scenarios either due to thermal effects or due to the onset of the Kelvin-Helmholtz instability (KHI). A kinetic model describes the growth and the saturation of the DC field. The predictions of the theory are confirmed by multidimensional particle-in-cell simulations, demonstrating the formation of long lived magnetic fields ($t \sim 100s \omega_{pi}^{-1}$) along the full longitudinal extent of the shear layer, with transverse width on the electron length scale ($\sqrt{\gamma_0}c/\omega_{pe}$), reaching magnitudes $eB_{\mathrm{DC}}/m_ec\omega_{pe}\sim \beta_0\sqrt{\gamma_0}$

Meson production in two-photon interactions at energies available at CERN Large Hadron Collider

The meson production cross sections are estimated considering photon-photon interactions in hadron - hadron collisions at CERN LHC energies. We consider a large number of mesons with photon-photon partial decay width well constrained by the experiment and some mesons which are currently considered as hadronic molecule and glueball candidates. Our results demonstrate that the experimental analysis of these states is feasible at CERN - LHC.Comment: 5 pages, 1 figure, 4 tables. Version published in Physical Review