Search results for "Digital"
showing 10 items of 3267 documents
Sterile neutrinos and B–L symmetry
2017
We revisit the relation between the neutrino masses and the spontaneous breaking of the B-L gauge symmetry. We discuss the main scenarios for Dirac and Majorana neutrinos and point out two simple mechanisms for neutrino masses. In this context the neutrino masses can be generated either at tree level or at quantum level and one predicts the existence of very light sterile neutrinos with masses below the eV scale. The predictions for lepton number violating processes such as mu to e and mu to e gamma are discussed in detail. The impact from the cosmological constraints on the effective number of relativistic degree of freedom is investigated.
Subleading Regge limit from a soft anomalous dimension
2018
Wilson lines capture important features of scattering amplitudes, for example soft effects relevant for infrared divergences, and the Regge limit. Beyond the leading power approximation, corrections to the eikonal picture have to be taken into account. In this paper, we study such corrections in a model of massive scattering amplitudes in N = 4 super Yang-Mills, in the planar limit, where the mass is generated through a Higgs mechanism. Using known three-loop analytic expressions for the scattering amplitude, we find that the first power suppressed term has a very simple form, equal to a single power law. We propose that its exponent is governed by the anomalous dimension of a Wilson loop w…
Operator product expansion coefficients in the exact renormalization group formalism
2020
We study how to compute the operator product expansion coefficients in the exact renormalization group formalism. After discussing possible strategies, we consider some examples explicitly, within the $\epsilon$-expansions, for the Wilson-Fisher fixed points of the real scalar theory in $d=4-\epsilon$ dimensions and the Lee-Yang model in $d=6-\epsilon$ dimensions. Finally we discuss how our formalism may be extended beyond perturbation theory.
Integrands of loop amplitudes within loop-tree duality
2020
Using loop-tree duality, we relate a renormalised $n$-point $l$-loop amplitude in a quantum field theory to a phase-space integral of a regularised $l$-fold forward limit of a UV-subtracted $(n+2l)$-point tree-amplitude-like object. We show that up to three loops the latter object is easily computable from recurrence relations. This defines an integrand of the loop amplitude with a global definition of the loop momenta. Field and mass renormalisation are performed in the on-shell scheme.
Nonperturbative renormalization and O(a)-improvement of the nonsinglet vector current with Nf=2+1 Wilson fermions and tree-level Symanzik improved ga…
2019
In calculating hadronic contributions to precision observables for tests of the Standard Model in lattice QCD, the electromagnetic current plays a central role. Using a Wilson action with O(a) improvement in QCD with Nf flavors, a counterterm must be added to the vector current in order for its on-shell matrix elements to be O(a) improved. In addition, the local vector current, which has support on one lattice site, must be renormalized. At O(a), the breaking of the SU(Nf) symmetry by the quark mass matrix leads to a mixing between the local currents of different quark flavors. We present a nonperturbative calculation of all the required improvement and renormalization constants needed for …
Learner identity in EFL: An analysis of digital texts of identity in higher education
2018
This study explores learner identity (LI) in digital texts of identity (DTI) produced by college learners in English as a foreign language (EFL). In so doing, it aims to shed light on learners’ connections of their learning experiences across time and settings, and their impact on the various learner identities that form their LI. It also intends to elucidate how learners construct powerful learner identities in and through their digital discourses. To this end, 51 DTI were collected and scrutinized, following studies on LI, critical and poststructuralist discourse analysis, and “thematic” and “dialogic/performative” analysis within narrative research. Learners established connections betwe…
The use of EduBlog in initial teachers training: an experience of a teaching innovation project
2020
Digital technologies are central elements of today's society. In this context to achieve an adequate degree of development of Digital Competence for professional performance is essential, as well as for life in society and the exercise of citizenship. Higher Education must actively contribute to develop Digital Competence, training students to effectively use digital technologies. That need is exacerbated in the case of initial teacher training, not only because of the progress towards a digitalized school, but also because of the fundamental role in the training of future generations. With the aim of promoting the development of Digital Teaching Competence, this paper presents an innovatio…
Sharing Perspectives in Virtual Interaction: Review of Methods of Analysis
2003
The aim of this paper is to describe the methodological solutions made in the studies that are part of the SHAPE research project. The SHAPE project investigates the quality and nature of virtual interaction in a higher education context. The study aims to find out variables that mediate the process of collaboration, particularly the emerging processes of sharing and constructing perspectives in virtual interaction. For conducting these studies we have developed various methods and models of analysis in order to gain better understanding of the process of collaboration in virtual interaction. In this paper, we will make a review of some of the SHAPE analysis methods used in the series of ou…
Supporting teachers' needs within and through E-learning systems
2014
These days more and more digital learning and teaching opportunities emerge into the world of higher education. In this upcoming project which is described in this paper, the teachers' needs, especially their teaching motivation will be regarded. This project is part of a bigger project, where several different faculties will work together. This combination of faculties is beneficial for topics like these, because the approach combines pedagogical and technical knowledge. This topic regarding teachers' needs deals with the initial and ongoing motivation as well as behavior and attitudes toward current or upcoming ICT systems for education. The main aspect of the project is to specify issues…