Archivio istituzionale della Ricerca - Scuola Normale Superiore
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The superposition principle for local 1-dimensional currents
No full textWe prove that every one-dimensional locally normal metric current, intended in the sense of U. Lang and S. Wenger, admits a nice integral representation through currents associated to (possibly unbounded) curves with locally finite length, generalizing the result shown by E. Paolini and E. Stepanov in the special case of Ambrosio-Kirchheim normal currents. Our result holds in Polish spaces, or more generally in complete metric spaces for 1-currents with tight support
The urban impact of AI: modelling feedback loops in location-based recommender systems
Full text linkObservation of the Very Rare Sigma+ ->p mu+mu- Decay
No full textThe first observation of the Sigma(+) -> p mu(+)mu(-) decay is reported with high significance using proton-proton collision data, corresponding to an integrated luminosity of 5.4 fb(-1), collected with the LHCb detector at a center-of-mass energy of 13 TeV. A yield of 237 +/- 16 Sigma(+) -> p mu(+)mu(-) decays is obtained, where the uncertainty is statistical only. A branching fraction of (1.08 +/- 0.17) x 10(-8) is measured, where the uncertainty includes statistical and systematic sources. No evidence of resonant structures is found in the dimuon invariant-mass distribution. All results are compatible with standard model expectations. This represents the rarest decay of a baryon ever observed
The role of composition and diameter in the crystal purity of InAsxP1−x nanowires
Full text linkTernary InAsxP1−x nanowires are widely considered promising building blocks for fundamental studies and applications in nano- and opto-electronics. However, it is admittedly challenging to maintain the necessary control over the crystal purity of nanowires. Furthermore, the crystal phase trends in ternary III–V nanowires remain generally unknown. In this work, we present wurtzite InAsxP1−x nanowires with different compositions x, ranging from 0 to 0.54, grown via chemical beam epitaxy on InP(111)B substrates using Au colloidal catalysts of different diameters. Transmission electron microscopy studies reveal that a pure wurtzite phase of the nanowires requires larger InAs fractions x for larger diameters of Au colloids (in particular, x = 0.36 for 20 nm diameter and x = 0.54 for 30 nm diameter Au colloids). We developed a model for the critical composition of thin vapor–liquid–solid III–V ternary nanowires xc corresponding to the transition from a polytypic structure at x < xc to a pure wurtzite structure at x > xc. For the InAsxP1−x material, the critical composition increases with the nanowire diameter, which explains our experimental findings. These results shed more light on the composition- and diameter-dependent polytypism, offering valuable insights for the design and crystal phase control of InAsxP1−x and other III–V ternary nanowires
GW241011 and GW241110: Exploring Binary Formation and Fundamental Physics with Asymmetric, High-spin Black Hole Coalescences
Full text linkSearch for t-channel scalar and vector leptoquark exchange in the high-mass dimuon and dielectron spectra in proton-proton collisions at TeV
Full text linkIl genere novellistico al crocevia del Quattrocento
Full text linkThis doctoral project aims to provide a critical literary profile of Italian short story production in the fifteenth century. The textual corpus under analysis consists of the three vernacular authorial collections from this period: the novella collection attributed to the pseudo-Gentile Sermini, Il Novellino by Masuccio Salernitano, and the Porretane by Sabadino degli Arienti. The study of these works also takes into account other forms of narratio brevis – in both Latin and the vernacular – that circulated during this century.The introductory section of the dissertation is composed of three chapters. The opening chapter outlines the research aims and provides an overview of the structure of the thesis. The second chapter addresses the absence of a contemporary theory of the novella at the time these collections were produced, with a newly conducted analysis of Giovanni Pontano’s De sermone. The third chapter revisits the theoretical foundations of the novella genre in current scholarship and presents an annotated bibliography of critical studies on Italian short story writing from the late fourteenth to the early sixteenth century.The second section of the thesis explores questions concerning narrative form. Chapter four examines the ethical dimension that permeates fifteenth-century storytelling, considering how this moral stance differs from narrative practices of the previous century and assessing the influence of contemporary hagiographic literature. Chapter five investigates narrative temporality and rhythm, with particular attention to narrative economy and the impact of humanist rhetoric.The third section offers thematic analyses of the selected corpus. Chapter six focuses on the representation of female characters and eroticism in the Quattrocento novella, aiming to assess the extent and nature of misogyny in this literary production. Chapter seven explores the problematic presence of the supernatural in fifteenth-century novellas in light of the evolving discourse of religious orthodoxy throughout the century.The final section summarizes the findings presented in the previous chapters and delineates the distinctive features of Quattrocento short story writing, advocating for a more prominent place for this body of work within literary historiography and criticism. The appendices include an overview of Latin humanist narrative prose from the fifteenth century and provide transcriptions of previously unpublished novellas from this corpus
[Recensione a] Matteo Lazzari, I Colori della Malafede: Afromessicani, Inquisizione e Razza in Nuova Spagna (1570–1650)
No full textA New ‘Emergent’ Powerhouse in the Global Automotive? Uneven Development, Exploitation, and Dependency in Morocco’s Car Industry
No full textThe article demonstrates that Morocco’s recent rise as an automotive hub constitutes a peripheral incorporation into the EU-centered car industry, underpinned by the perpetuation of low wages to the advantage of foreign direct investments (FDI) in labor-intensive components and low-cost cars. Through a Marxist lens, this can be seen as structurally related to the inherently uneven character of global production. Nevertheless, geopolitics is also incorporated into the analysis, showing how the relegation of Morocco to a low-wage export platform has been systematically pursued by EU policies of asymmetrical trade integration and migration restrictions, as a counterpart to the semi-peripheral inclusion of Central and Eastern European countries in the EU bloc. At the domestic level, wage compression has been reproduced by state-led policies of accumulation by dispossession, labor precaritization, and repression. Additionally, the state’s FDI-driven industrial policies have contributed to keeping Morocco in the automotive periphery by diverting resources from autonomous development goals and consolidating dependency on transnational capital. Drawing on primary data collected during four months of fieldwork in 2023, this article provides a critical contribution to debates on global production by challenging mainstream perspectives on industrial upgrading through integration into global value chains, while bridging the global and domestic dimensions of uneven capitalist development
Measurement of the branching fraction ratio RK at large dilepton invariant mass
Full text linkA test of lepton universality between muons and electrons is performed using B+ -> K+\ell+\ell- decays (where \ell = e, mu), in the dilepton invariant-mass-squared region above 14.3 GeV2/c4. The data used for the measurement consists of beauty meson decays produced in proton-proton collisions, corresponding to an integrated luminosity of 9 fb-1, collected by the LHCb experiment between 2011 and 2018. The ratio of branching fractions for B+-> K+mu+mu- and B+-> K+e+e- decays is measured to be RK=1.08−0.09+0.11stat-0.04+0.04syst, which is consistent with the Standard Model prediction of unity. This constitutes the most precise test of lepton flavour universality using B+ -> K+\ell+\ell-decays with dilepton invariant-mass-squared above the ψ(2S) mass, whilst being the first of its kind at a hadron collider