Search results for "virtu"
showing 10 items of 1987 documents
Towards Hybrid Aesthetics
1998
In order to avoid limiting hybridity to sterile ‘racial’ considerations, it needs to be placed firmly in its cultural context. Cultures and civilisations have often been taken as synonyms. For E.B. Tylor in Primitive Culture, words such as ‘culture’ or ‘civilization’ refer to the body of sciences, arts, beliefs, moral principles, laws, customs, in short all the habits and faculties acquired by human beings as part of their social life. Tylor draws a distinction between three stages in the evolution of societies: the savage, the barbarian and the civilised. He thus reintroduces a hierarchy between ‘civilisation’, which is reserved for the highest point on his evolutionary scale, and ‘culture…
Hadronic light-by-light scattering contribution to the muon $g-2$ from lattice QCD: semi-analytical calculation of the QED kernel
2023
Hadronic light-by-light scattering is one of the virtual processes that causes the gyromagnetic factor $g$ of the muon to deviate from the value of two predicted by Dirac's theory. This process makes one of the largest contributions to the uncertainty of the Standard Model prediction for the muon $(g-2)$. Lattice QCD allows for a first-principles approach to computing this non-perturbative effect. In order to avoid power-law finite-size artifacts generated by virtual photons in lattice simulations, we follow a coordinate-space approach involving a weighted integral over the vertices of the QCD four-point function of the electromagnetic current carried by the quarks. Here we present in detai…
Black hole radiance, short distances and TeV gravity.
2006
Using a derivation of black hole radiance in terms of two-point functions one can provide a quantitative estimate of the contribution of short distances to the spectrum. Thermality is preserved for black holes with $��l_P <<1$. However, deviations from the Planckian spectrum can be found for mini black holes in TeV gravity scenarios, even before reaching the Planck phase.
Quantum stress tensor for extreme 2D Reissner-Nordström black holes
2004
Contrary to previous claims, it is shown that the expectation values of the quantum stress tensor for a massless scalar field propagating on a two-dimensional extreme Reissner-Nordstrom black hole are indeed regular on the horizon.
Spacetime structure of an evaporating black hole in quantum gravity
2006
The impact of the leading quantum gravity effects on the dynamics of the Hawking evaporation process of a black hole is investigated. Its spacetime structure is described by a renormalization group improved Vaidya metric. Its event horizon, apparent horizon, and timelike limit surface are obtained taking the scale dependence of Newton's constant into account. The emergence of a quantum ergosphere is discussed. The final state of the evaporation process is a cold, Planck size remnant.
Sterile Neutrinos, Black Hole Vacuum and Holographic Principle
2021
We construct an effective field theory (EFT) model that describes matter field interactions with Schwarzschild mini-black-holes (SBH's), treated as a scalar field, $B_0(x)$. Fermion interactions with SBH's require a random complex spurion field, $\theta_{ij}$, which we interpret as the EFT description of "holographic information," which is correlated with the SBH as a composite system. We consider Hawking's virtual black hole vacuum (VBH) as a Higgs phase, $\langle B_0 \rangle =V$. Integrating sterile neutrino loops, the field $\theta_{ij}$ is promoted to a dynamical field, necessarily developing a tachyonic instability and acquiring a VEV of order the Planck scale. For $N$ sterile neutrino…
Deep and Meaningful E-Learning with Social Virtual Reality Environments in Higher Education: A Systematic Literature Review
2021
Deep and meaningful learning (DML) in distant education should be an essential outcome of quality education. In this literature review, we focus on e-learning effectiveness along with the factors and conditions leading to DML when using social virtual reality environments (SVREs) in distance mode higher education (HE). Hence, a systematic literature review was conducted summarizing the findings from thirty-three empirical studies in HE between 2004 (appearance of VR) and 2019 (before coronavirus appearance). We searched for the cognitive, social, and affective aspects of DML in a research framework and studied their weight in SVREs. The findings suggest that the use of SVREs can provide aut…
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…
<em>L’entramès de Mestre Vicent</em>: resplandor de la autoridad del predicador
2019
El presente artículo aborda múltiples aspectos, algunos inéditos, referentes a l’entramès de Mestre Vicent. Entre los objetivos del estudio descuella la reconstrucción virtual y documentada de aquel carro que, quizá albergando la primera representación de Vicent Ferrer, desfiló en Valencia a finales de 1414 con ocasión de la entrada real de Fernando I. Otras cuestiones de especial relevancia atañen a la autoría del programa iconográfico y al proselitismo que denotaba aquella estructura, cuyos máximos beneficiarios fueron el Trastámara y la propia ciudad. Metodológicamente, se subraya la complejidad que entraña ceñir la interpretación del entremés amparada exclusivamente en la literatura, má…
Making Bishops in the Malta of the Knights, 1530-1798
2015
During the early modern age the appointment of Maltese bishops involved conflicts in the management of ecclesiastical patronage, jurisdictional issues and international diplomacy. The procedure for appointment, established by Charles v in 1530 when he granted Malta to the Order of St John, was the result of a compromise: safeguarding rights of royal patronage without undermining the independence of an international military order. It is important, however, to underline the reforming activity conducted by bishops appointed in such political ways, especially through the application of some institutions provided by the Council of Trent, such as diocesan synods.