86,906 research outputs found
Rights of Migrants in European Space: Notes for an Introduction
Get PDFThisintroductorychapterreflectsonthenatureofcontemporarymigratory movements, focusing on transversally relevant themes, such as the spatial dimension of reception, with particular reference to the “right to the city” and the right to housing; the sphere of human rights, with particular attention to the right to mobility, citizenship and social security; the sphere of multilingualism and linguistic rights, with particular regard to migrants’ narratives and education. Starting from these key themes, the volume’s editors provide a synthesis of the experiences gained at the national and international level by the authors of the individual chapters, comparing them with the current international scientific debate on migration. The interdisci- plinary approach and the different and innovative ways of deepening the thematic content of the migration phenomenon have allowed us to identify some key research questions. Their answers find their place in the articulated and complex system of contributions that develops within the book, through three main parts that correspond to the three aforementioned themes
Il sostegno finanziario a sostegno dell'innovazione eco-compatibile tra forme tradizionali e moderne
No full textTests of quantum gravity-induced non-locality: Hamiltonian formulation of a non-local harmonic oscillator
Get PDFMotivated by the development of on-going optomechanical experiments aimed at constraining non-local effects inspired by some quantum gravity scenarios, the Hamiltonian formulation of a non-local harmonic oscillator, and its coupling to a cavity field mode(s), is investigated. In particular, we consider the previously studied model of non-local oscillators obtained as the nonrelativistic limit of a class of non-local Klein-Gordon operators, f, with f an analytical function. The results of previous works, in which the interaction was not included, are recovered and extended by way of standard perturbation theory. At the same time, the perturbed energy spectrum becomes available in this formulation, and we obtain the Langevin's equations characterizing the interacting system.</p
Tuning non-Markovianity by spin-dynamics control
No full textWe study the interplay between forgetful and memory-keeping evolution enforced on a two-level system by a multi-spin environment whose elements are coupled to local bosonic baths. Contrarily to the expectation that any non-Markovian effect would be buried by the forgetful mechanism induced by the spin-bath coupling, one can actually induce a full Markovian-to-non-Markovian transition of the two-level system's dynamics, controllable by parameters such as the mismatch between the energy of the two-level system and of the spin environment. For a symmetric coupling, the amount of non-Markovianity surprisingly grows with the number of decoherence channels. DOI: 10.1103/PhysRevA.87.022317</p
Il sistema finanziario: una ricognizione sugli istituti operanti nella Provincia di Siena
No full textGeometrical characterization of non-Markovianity
Get PDFWe introduce a tool for the quantitative characterization of the departure from Markovianity of a given dynamical process. Our tool can be applied to a generic N-level system and extended straightforwardly to Gaussian continuous-variable systems. It is linked to the change of the volume of physical states that are dynamically accessible to a system and provides qualitative expectations in agreement with some of the analogous tools proposed so far. We illustrate its predictive power by tackling a few canonical examples
Communicative Practices and Online Communities on Social Media in Migration Context
No full textThe chapter investigates the digital communication practices among a group of young migrants living in Palermo. In particular, the analysis aims to study both how migrant youth who belong to superdiverse networks use communicative resources and the way they handle the networked relations they establish in the host community. The data of the chapter come from the Facebook feeds of two young migrant youths who met each other and the researchers at a school of Italian in Palermo. Central in our work is the recognition of the need to change our views about the composition and trajectories of migrant groups. In this perspective we review literature on digital diasporas, underlining how this literature has built on research about social media communication, particularly work on context collapse and audience design. Finally, we argue that neither the concept of “diaspora” nor the different labels used for this kind of community (“intradiverse”, “light” “of practice” and the like) are able to capture the complexity of networks that young migrants are shown to construct online
Role of environmental correlations in the non-Markovian dynamics of a spin system
No full textWe study the dynamics of a chain of interacting quantum particles affected by an individual or collective environment(s), focusing on the role played by the environmental quantum correlations over the evolution of the chain. The presence of entanglement in the state of the environment magnifies the non-Markovian nature of the chain's dynamics, giving rise to structures in figures of merit such as spin entanglement and purity that are not observed under a separable environmental state. Our analysis can be relevant to problems tackling the open-system dynamics of biological complexes of strong current interest
Determining stationary-state quantum properties directly from system-environment interactions
Get PDFConsidering stationary states of continuous-variable systems undergoing an open dynamics, we unveil the connection between properties and symmetries of the latter and the dynamical parameters. In particular, we explore the relation between the Lyapunov equation for dynamical systems and the steady-state solutions of a time-independent Lindblad master equation for bosonic modes. Exploiting bona-fide relations that characterize some genuine quantum properties (entanglement, classicality, and steerability), we obtain conditions on the dynamical parameters for which the system is driven to a steady-state possessing such properties. We also develop a method to capture the symmetries of a steady state based on symmetries of the Lyapunov equation. All the results and examples can be useful for steady-state engineering process
- …
