Search results for "SCALAR"

Highly occupied gauge theories in 2 + 1 dimensions : a self-similar attractor

2019

Motivated by the boost-invariant Glasma state in the initial stages in heavy-ion collisions, we perform classical-statistical simulations of SU(2) gauge theory in 2+1 dimensional space-time both with and without a scalar field in the adjoint representation. We show that irrespective of the details of the initial condition, the far-from-equilibrium evolution of these highly occupied systems approaches a unique universal attractor at high momenta that is the same for the gauge and scalar sectors. We extract the scaling exponents and the form of the distribution function close to this non-thermal fixed point. We find that the dynamics are governed by an energy cascade to higher momenta with sc…

PROGETTARE LO SPAZIO INTERCULTURALE. Approccio multi-scalare nel quartiere Albergheria a Palermo / DESIGNING INTERCULTURAL SPACE. A multi-scalar appr…

2020

Migration has always been a major driver of urban transformation stimulating opportunities and challenges for cities and encouraging architectural and urban designers for taking a proactive and dynamic role in responding to the crisis. Enhancing these changes, and designing intercultural spaces for local communities, is a complex and urgent spatial challenge, that should be addressed by a multi-scalar approach aiming to integrate urban, architectural and public spaces. This paper illustrates a research-action resulting from a collective work developed on key urban spaces of the Albergheria neighborhood of Palermo, where a design-led research based on a multiscalar regeneration approach (urb…

MR2911371 Reviewed Raja, Matías; Rodríguez, José Scalar boundedness of vector-valued functions. Glasg. Math. J. 54 (2012), no. 2, 325–333. (Reviewer:…

2012

Language for International Communication: Linking Interdisciplinary Perspectives (3rd international symposium, University of Latvia, Latvia, on May 2…

2016

This collection contains papers delivered at the 3rd international symposium Language for International Communication: Linking Interdisciplinary Perspectives held at the University of Latvia, Latvia, on May 26–27, 2016.

Why Use Interactive Multi-Objective Optimization in Chemical Process Design?

2008

Problems in chemical engineering, like most real-world optimization problems, typically, have several conflicting performance criteria or objectives and they often are computationally demanding, which sets special requirements on the optimization methods used. In this chapter, we point out some shortcomings of some widely used basic methods of multi-objective optimization. As an alternative, we suggest using interactive approaches where the role of a decision maker or a designer is emphasized. Interactive multi-objective optimization has been shown to suit well for chemical process design problems because it takes the preferences of the decision maker into account in an iterative manner tha…

Pseudospectrum of Reissner-Nordström black holes: Quasinormal mode instability and universality

2021

Black hole spectroscopy is a powerful tool to probe the Kerr nature of astrophysical compact objects and their environment. The observation of multiple ringdown modes in gravitational waveforms could soon lead to high-precision gravitational spectroscopy, so it is critical to understand if the quasinormal mode spectrum is stable against perturbations. It was recently shown that the pseudospectrum can shed light on the spectral stability of black hole quasinormal modes. We study the pseudospectrum of Reissner-Nordstr\"om spacetimes and we find a spectral instability of scalar and gravitoelectric quasinormal modes in subextremal and extremal black holes, extending similar findings for the Sch…

Polaroid-Type Operators

2018

In this chapter we introduce the classes of polaroid-type operators, i.e., those operators T ∈ L(X) for which the isolated points of the spectrum σ(T) are poles of the resolvent, or the isolated points of the approximate point spectrum σap(T) are left poles of the resolvent. We also consider the class of all hereditarily polaroid operators, i.e., those operators T ∈ L(X) for which all the restrictions to closed invariant subspaces are polaroid. The class of polaroid operators, as well as the class of hereditarily polaroid operators, is very large. We shall see that every generalized scalar operator is hereditarily polaroid, and this implies that many classes of operators acting on Hilbert s…

Synchronous R-NSGA-II: An Extended Preference-Based Evolutionary Algorithm for Multi-Objective Optimization

2015

Classical evolutionary multi-objective optimization algorithms aim at finding an approx- imation of the entire set of Pareto optimal solutions. By considering the preferences of a decision maker within evolutionary multi-objective optimization algorithms, it is possible to focus the search only on those parts of the Pareto front that satisfy his/her preferences. In this paper, an extended preference-based evolutionary algorithm has been proposed for solving multi-objective optimiza- tion problems. Here, concepts from an interactive synchronous NIMBUS method are borrowed and combined with the R-NSGA-II algorithm. The proposed synchronous R-NSGA-II algorithm uses preference information provid…

Branding4Resilience. Esplorare e co-progettare i territori interni

2022

I territori interni e le aree marginali sono un tema noto per le discipline del progetto e un problema discusso non solo in Italia ma in tutta Europa. Secondo EUROSTAT (2020) circa il 58% della popolazione europea vive e lavora in aree rurali o scarsamente abitate e in aree dalla densità limitata. Squilibri e disparità nelle politiche sono osservabili a livello regionale e spesso mancano approcci sistemici in grado di affrontare il problema della marginalità tenendo insieme approcci strategici e azioni locali. Specialmente in seguito alla pandemia questa situazione si è acuita e i territori interni faticano a rispondere alle grandi sfide attuali, con particolare riferimento al clima. Come c…

K°- K°, - D° and B° - B° oscillations in the Standard Model and beyond from unquenched Twisted Mass Lattice QCD

2013

El análisis del triángulo de unitariedad y la búsqueda de cotas restrictivas sobre las escala de nueva física requiere medidas precisas de las amplitudes de mezcla de las oscilaciones de mesones. El retículo proporciona una óptima herramienta no perturbativa para el cálculo de dichos elementos de matriz con incertidumbres del 1% y errores sistemáticos bajo control. La tesis se centra en el cálculo de los parámetros B, que controlan las oscilaciones de mesones, la masa del quark b y las constantes de desintegración fB y fBs a partir de QCD simulada en el retículo con fermiones Twisted Mass e incluyendo los efectos cuánticos de quarks dinámicos en el mar. A lo largo de esta tesis, a partir de…