Bootstrapping the Chiral Anomaly at Large NcN_c

The bootstrap approach (demanding consistency conditions to scattering amplitudes) has shown to be quite powerful to tightly constrain gauge theories at large $N_c$. We extend previous analysis to scattering amplitudes involving pions and external gauge bosons. These amplitudes allow us to access the chiral anomaly and connect low-energy physical quantities to UV properties of the theory. In particular, we are able to obtain an analytic bound on the chiral anomaly coefficient as a function of the pion dipole polarizabilities. This bound can be useful for holographic models whose dual UV completions are not known, and provide a consistency condition to lattice simulations.Comment: 20 pages, 1 figure. v2: bound on the anomaly generalised and typos correcte

Cornering large-N c QCD with positivity bounds

Abstract The simple analytic structure of meson scattering amplitudes in the large-N c limit, combined with positivity of the spectral density, provides precise predictions on low-energy observables. Building upon previous studies, we explore the allowed regions of chiral Lagrangian parameters and meson couplings to pions. We reveal a structure of kinks at all orders in the chiral expansion and develop analytical tools to show that kinks always correspond to amplitudes with a single light pole. We build (scalar- and vector-less) deformations of the Lovelace-Shapiro and Coon UV-complete amplitudes, and show that they lie close to the boundaries. Moreover, constraints from crossing-symmetry imply that meson couplings to pions become smaller as their spin increases, providing an explanation for the success of Vector Meson Dominance and holographic QCD. We study how these conclusions depend on assumptions about the high-energy behavior of amplitudes. Finally, we emphasize the complementarity between our results and Lattice computations in the exploration of large-N c QCD

Bootstrapping the chiral anomaly at large N c

Abstract The bootstrap approach (demanding consistency conditions to scattering amplitudes) has shown to be quite powerful to tightly constrain gauge theories at large N c . We extend previous analysis to scattering amplitudes involving pions and external gauge bosons. These amplitudes allow us to access the chiral anomaly and connect low-energy physical quantities to UV properties of the theory. In particular, we are able to obtain an analytic bound on the chiral anomaly coefficient as a function of the pion dipole polarizabilities. This bound can be useful for holographic models whose dual UV completions are not known, and provide a consistency condition to lattice simulations

Strategic Research & Innovation Agenda - Italia - Volume 1

La Strategic Research and Innovation Agenda - Italia (SRIA It) redatta dalla piattaforma tecnologica italiana per l’aeronautica (ACARE Italia) considerando peculiarità, esigenze e priorità nazionali - illustra obiettivi e roadmap tecnologica condivisi dai vari attori nazionali fornendo le linee di orientamento per le attività R-ST nonché un utile riferimento nella definizione delle strategie di investimento nazionale per il settore dell’Aeronautica e piu’ in generale del Trasporto Aereo, includendo anche i sistemi per missioni speciali civili e gli aspetti duali

Strategic Research & Innovation Agenda - Italia - Volume 2

The Strategic Research and Innovation Agenda - Italia (SRIA It) - prepared by the Italian technology platform for aeronautics (ACARE Italia) considering national peculiarities, needs and priorities - illustrates objectives and technology roadmap shared by the various national actors providing at the same time guidelines for the R-D activities as well as a useful reference in the definition of national investment strategies for the Aeronautics sector and more in general for the Air Transport sector, also including systems for civilian special missions as well as dual aspects

Strategic Research & Innovation Agenda - Italia - Executive Summary

La Strategic Research and Innovation Agenda - Italia (SRIA It) - redatta dalla piattaforma tecnologica italiana per l’aeronautica (ACARE Italia) considerando peculiarità, esigenze e priorità nazionali - illustra obiettivi e roadmap tecnologica condivisi dai vari attori nazionali fornendo le linee di orientamento per le attività R-ST nonché un utile riferimento nella definizione delle strategie di investimento nazionale per il settore dell’Aeronautica e piu’ in generale del Trasporto Aereo, includendo anche i sistemi per missioni speciali civili e gli aspetti duali

Estimating minimum adult HIV prevalence: A cross-sectional study to assess the characteristics of people living with HIV in Italy

In 2012, we conducted a retrospective cross-sectional study to assess the number of people living with HIV linked to care and, among these, the number of people on antiretroviral therapy. The health authority in each of the 20 Italian Regions provided the list of Public Infectious Diseases Clinics providing antiretroviral therapy and monitoring people with HIV infection. We asked every Public Infectious Diseases Clinic to report the number of HIV-positive people diagnosed and linked to care and the number of those on antiretroviral therapy during 2012. In 2012, 94,146 people diagnosed with HIV and linked to care were reported. The majority were males (70.1%), Italians (84.4%), and aged between 25 and 49 years (63.4%); the probable route of transmission was heterosexual contact in 37.5% of cases, injecting drug use in 28.1%, and male-to-male contact in 27.9%. Among people in care, 20.1% had less than 350 CD4 cells/μl, 87.6% received antiretroviral therapy, and among these, 62.4% had a CD4 cell count higher than 350 cells/μl. The overall estimated prevalence of individuals diagnosed and linked to care in 2012 in Italy was 0.16 per 100 residents (all ages). Adding the estimated proportion of undiagnosed people, the estimated HIV prevalence would range between 0.19 and 0.26 per 100 residents. In Italy, the majority of people diagnosed and linked to care receive antiretroviral therapy. A higher prevalence of individuals diagnosed and linked to care was observed in Northern Italy and among males. More information for developing the HIV care continuum is necessary to improve the entire engagement in care, focusing on test-and-treat strategies to substantially reduce the proportion of people still undiagnosed or with a detectable viral load