123,316 research outputs found
RG FLOW IRREVERSIBILITY, C THEOREM AND TOPOLOGICAL NATURE OF 4-D N=2 SYM
No full textWe determine the exact beta function and a RG flow Lyapunov function for N=2 super-Yang-Mills (SYM) theory with the gauge group SU(n). It turns out that the classical discriminants of the Seiberg-Witten curves determine the RG potential. The radial irreversibility of the RG flow in the SU(2) case and the nonperturbative identity relating the u modulus and the superconformal anomaly indicate the existence of a four-dimensional analogue of the c theorem for N=2 SYM theory which we formulate for the full SU(n) theory. Our investigation provides further evidence of the essentially topological nature of the theory
Amministrazione riformata e nuovo volto della responsabilità amministrativa: dall'esigenza di legittimità alla prospettiva gestionale
No full textIl saggio, che costituisce la prima parte della monografia, introduce la trattazione della nuova disciplina sostanziale della responsabilità amministrativa affrontando la tematica del superamento della esigenza di legittimità, alla luce della nuova prospettiva gestionale. Viene approfondito, inoltre, il significato dell'elemento psicologico nel contesto riformato della responsabilità amministrativa
L'incostituzionalità dei controlli sulle Regioni introdotti dal D.L. n. 174/2012 (Costi della politica versus sana gestione finanziaria alla luce della sentenza della Corte costituzionale n. 219/2013)
No full textL’articolo prende le mosse dai controlli sulle Regioni introdotti dal D.L. 174/2012, che hanno formato oggetto di sindacato da parte della Corte costituzionale. In particolare viene esaminata la declaratoria di incostituzionalità di alcune nuove forme governative di verifica finanziaria sulle Regioni, formulando osservazioni critiche agli argomenti adoperati dal Giudice delle leggi per pronunciare con la sentenza n. 219/2013, l’incostituzionalità dell’art. 5 del d.lgs. n. 149/2011 nel testo modificato dall’art. 1 bis comma 4 del D.L. n. 174/2012, convertito con mod. in L. n. 213/2012. In particolare viene rilevata la mancanza di un bilanciamento di valori in riferimento al parametro del novellato art. 97 Cost. e al principio della sana gestione finanziaria
N=2 gauge theories on unoriented/open four-manifolds and their AGT counterparts
No full textWe compute the exact path integral of N = 2 supersymmetric gauge theories with general gauge group on RP4 and a Z(2)-quotient of the hemi-S-4. By specializing to SU(2) superconformal quivers, we show that these, together with hemi-S-4 partition functions, compute Liouville correlators on unoriented/open Riemann surfaces. We perform explicit checks for Riemann surfaces obtained as Z(2) quotients of the sphere and the torus. We also discuss the coupled 3d-4d systems associated to Liouville amplitudes with boundary punctures
Hitchin systems, N=2 gauge theories and W-gravity
No full textAbstractWe propose some arguments supporting an M-theory derivation of the duality recently discovered by Alday, Gaiotto and Tachikawa between two-dimensional conformal field theories and N=2 superconformal gauge theories in four dimensions. We find that AN−1 Toda field theory is the simplest two-dimensional conformal field theory quantizing the moduli of N M5-branes wrapped on a Riemann surface. This leads us to identify chiral operators of the N=2 gauge theories with integrated W-algebra currents. As a check of this correspondence we study some relevant OPE's obtaining that Nekrasov's partition function satisfies W-geometry constraints
NONPERTURBATIVE RELATIONS IN N=2 SUSY YANG-MILLS AND WDVV EQUATION
No full textWe find the nonperturbative relation between , the prepotential F and in N = 2 supersymmetric Yang-Mills theory (SYM) with gauge group SU(3). Nonlinear differential equations for F including the Witten-Dijkgraaf-Verlinde-Verlinde equation are obtained, indicating that N = 2 SYM theories are essentially topological field theories which should be seen as the low-energy limit of some topological string theory. Furthermore, we construct relevant modular invariant quantities, derive canonical relations between the periods, and find the β function in terms of the moduli. In doing this we discuss the uniformization problem for the quantum moduli space
NONPERTURBATIVE RENORMALIZATION GROUP EQUATION AND BETA FUNCTION IN N=2 SUSY YANG-MILLS
No full textWe obtain the exact beta function for N = 2 supersymmetric SU Yang-Mills theory and prove the nonperturbative renormalization group equation ∂ΛF = ∂Λ0F×exp[-2τ0τdxβ-1]
Eco- compatible technology in building refurbishment
No full textABSTRACT: The case study, we talk about in our paper, is centred on "Cesarea ex-hospital", a XVII century building at present used as residence. There is a restoration project made by the Naples municipality on this ex- hospital and now it's being carried out. The present state of physical and typological degradation has caused the loss of the functional and aesthetic prestations of the building. Our analysis and proposals of architectural intervention is aim at a global building improvement. For example in our restoration project, we propose to return to the natural ventilation and sunning system today spoiled by dangerous and neglectful superfetations. A part of our communication will be devoted to the examination of the methodology we've studied to outline an appropriate refurbishment project. We believe that methodology is apt to define an item of praxis but the case study obliges to carry out a specific research on the building in object and the environment in which it is. So we recognise three phases of approach to the project: 1) the knowledge phases, based on the building subdivision in FUNCTIONAL SYSTEMS search and prestational valuations aiming at specific themes. 2) definition of objectives and architectural project. 3) examination of the justness of chosen solutions. Our paper describes the intervention hypothesis studied at good level of definition. This part concerns the collection and rescue of meteoric and gray waters to re-employ them for common uses by people living at Cesarea ex-hospital. BIO-FILTERS and BIO-PHITODEPURATION are the techniques utilized to clean used waters, first separated according to their different origin. KEYWORDS: ancient building, methodology, microclima control, prestational analysis, sustainable recovery project
Exact results for N = 2 supersymmetric gauge theories on compact toric manifolds and equivariant Donaldson invariants
No full textWe provide a contour integral formula for the exact partition function of N = 2 supersymmetric U(N) gauge theories on compact toric four-manifolds by means of supersymmetric localisation. We perform the explicit evaluation of the contour integral for U(2) N = 2∗ theory on CP2 for all instanton numbers. In the zero mass case, corresponding to the N = 4 supersymmetric gauge theory, we obtain the generating function of the Euler characteristics of instanton moduli spaces in terms of mock-modular forms. In the decoupling limit of infinite mass we find that the generating function of local and surface observables computes equivariant Donaldson invariants, thus proving in this case a longstanding conjecture by N. Nekrasov. In the case of vanishing first Chern class the resulting equivariant Donaldson polynomials are new. © 2016, The Author(s)
Plano topográfico de Santa Isabel de Fernando Poo
No full textPertenece a la Colección de la Biblioteca de Emilio Bonelli y Hernando y Juan María Bonelli y RubioOrientado con rosa señalando en N. al NE. de la hojaFirma y rúbrica manuscrita del autor del planoManuscrito realizado en tela aprestad
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