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Omero e Virgilio : vite parallele
No full textIl confronto tra Omero e Virgilio, come massimi autori della letteratura greca e latina, si estese, già nell’antichità, alle tradizioni aneddotiche e biografiche che circolavano su di loro, spesso costruite su interpretazioni autobiografiche delle loro opere o su schemi narrativi ricorrenti. In questo articolo, intendo suggerire che la tradizione aneddotica su Omero influenzò, sotto vari aspetti, quella su Virgilio, riflettendo sul piano biografico le loro analogie letterarie. In primo luogo, molti aneddoti sono attestati sia per Omero sia per Virgilio: entrambi si dedicarono alla poesia fin da giovani, scrissero epigrammi contro maestri di scuola, composero opere giovanili scherzose, donarono testi ad amici che li divulgarono a proprio nome, viaggiarono per documentarsi e scrissero i propri epitafi. Il fatto che queste analogie siano costruite per fare di Virgilio il corrispettivo latino di Omero è comprovato dalla frequente menzione di quest’ultimo nelle Vitae Vergilianae. Per
esempio, Foca enfatizza la competizione tra Omero e Virgilio, campioni delle due
letterature, mentre la Vita di Svetonio-Donato rileva che Virgilio ebbe critici come lo stesso Omero, a dimostrazione della sua abilità emulativa. In conclusione, la narrazione della vita di Virgilio secondo schemi attestati già per Omero contribuisce a rafforzare il suo ruolo al vertice del canone letterario latino, in linea con la vocazione eminentemente storicoletteraria delle antiche biografie dei poeti
Swift-BAT GUANO Follow-up of Gravitational-wave Triggers in the Third LIGO–Virgo–KAGRA Observing Run
Full text linkWe present results from a search for X-ray/gamma-ray counterparts of gravitational-wave (GW) candidates from the third observing run (O3) of the LIGO–Virgo–KAGRA network using the Swift Burst Alert Telescope (Swift-BAT). The search includes 636 GW candidates received with low latency, 86 of which have been confirmed by the offline analysis and included in the third cumulative Gravitational-Wave Transient Catalogs (GWTC-3). Targeted searches were carried out on the entire GW sample using the maximum-likelihood Non-imaging Transient Reconstruction and Temporal Search pipeline on the BAT data made available via the GUANO infrastructure. We do not detect any significant electromagnetic emission that is temporally and spatially coincident with any of the GW candidates. We report flux upper limits in the 15–350 keV band as a function of sky position for all the catalog candidates. For GW candidates where the Swift-BAT false alarm rate is less than {10}^−3 Hz, we compute the GW–BAT joint false alarm rate. Finally, the derived Swift-BAT upper limits are used to infer constraints on the putative electromagnetic emission associated with binary black hole mergers
La classe vagabonda: definizione di un nemico criminale e politico nella Rivoluzione francese
No full textIl tema del saggio è la percezione culturale, sociale e politica del vagabondaggio all’inizio della Rivoluzione francese, che determinò la metamorfosi della concezione dei vagabondi da individui antisociali a classe naturalmente criminale e ostile sia alla società sia, soprattutto, allo Stato. L’articolo evidenzia come, tra il 1789 e il 1792, il vagabondo sia stato progressivamente identificato come un sovversivo, un brigante in potenza. Il testo si sofferma sia sulle analisi elaborate da alcune delle principali autorità della Francia rivoluzionaria nella gestione del problema sia sulla stampa rivoluzionaria e controrivoluzionaria. Si intende così sottolineare come questo immaginario sia stato universalmente interiorizzato dagli attori dell’epoca, favorevoli o meno alla Rivoluzione, e che ciò abbia contribuito a porre le basi per la strutturazione di nuovi immaginari politici, culturali e sociali.The topic of this article is the cultural, social and political perception of vagrancy
during the early years of the French Revolution. The argument put forward is that the
Revolution was a defining context for the metamorphosis of the conception of vagabonds
from anti-social individuals to a naturally criminal class hostile to both society and, most
importantly, the State. The article analyses how between 1789 and 1792 vagabonds were
progressively perceived as subversive individuals, as potential bandits. The text dwells on
the analyses of vagrancy developed by some of the authorities of revolutionary France in
addressing vagrancy as well as on the revolutionary and counter-revolutionary press. The aim
is to highlight how this collective imaginary was universally internalised by contemporary
actors, both supportive and opposed to the Revolution, and how this contributed to laying
the foundations for shaping new political, cultural and social imaginaries
Il 'donax' di Apuleio fra epigramma erotico e poesia bucolica: intertestualità e critica testuale in Apul. fr. 4 Courtney/Blänsdorf
No full textStarting from the discussion of a textual problem in the final couplet of a pederastic epigram composed by Apuleius, and quoted by the author in the Apologia (Apul. fr. 4 Courtney/Blänsdorf), this article provides further exploration of the intertextual relationships in Apuleian poetry with the Greco-Roman literary tradition, focusing in particular on bucolic poetry (Virgil’s Eclogue 2; Calpurnius Siculus’ Eclogue 3) and erotic epigrams (Meleager, already a model for Verg. ecl. 2; [ps.-]Plato)
Some cusp-transitive hyperbolic 4-manifolds
No full textWe realize 4 of the 6 closed orientable flat 3-manifolds as a cusp section of an orientable finite-volume hyperbolic 4-manifold whose symmetry group acts transitively on the set of cusps
Global and local minima of -Brjuno functions
Full text linkThe main goal of this article is to analyze some peculiar features of the global (and local) minima of -Brjuno functions where Our starting point is the result by Balazard--Martin (2020), who showed that the minimum of is attained at ; analyzing the scaling properties of near we shall deduce that all preimages of under the Gauss map are also local minima for . Next we consider the problem of characterizing global and local minima of for other values of : we show that for the global minimum is again attained at , while for in a neighbourhood of the function attains its minimum at .
The fact that the minimum of is attained when ranges over a whole interval of parameters is non trivial. Indeed, we prove that is lower semicontinuous for all rational but we also exhibit an irrational for which is not lower semicontinuou
ΔT-noise in multiterminal hybrid systems
No full textThe study of charge current fluctuations (noise) can give useful insights into the properties of nanoscale systems. In this work, the peculiar properties of noise in multiterminal hybrid normal-superconducting systems are explored in the thermal out-of-equilibrium regime, i.e., when temperature biases are present (-noise). Using the Landauer-Büttiker approach, we identify two contributions: background noise and excess noise, analyzing them when both electrical and thermal biases are applied. When temperature biases are present, and superconducting terminals are grounded, we find that the first contribution depends not only on the electrical conductance, as the Johnson-Nyquist at equilibrium, but also on a quantity strictly related to the heat conductance. This is our first main result. On the other hand, the second contribution shows, as expected, additional terms originating from the partitioning of currents into different transport channels, including the ones associated with Andreev reflection processes. However, noise induced by the temperature differences unveils also interference terms that cannot be present either in voltage bias or in the absence of any Andreev processes. Finally, we apply the results obtained to two different specific physical situations. The first is a generic three-terminal normal-superconductor-normal system and the second is a device based on spin-resolved copropagating chiral channels in the integer quantum Hall regime with a superconducting region. In these example setups, we investigate mainly the shot-noise regimes, when high-voltage or high-temperature biases are applied. We find remarkable differences between the two limits, which ultimately show the different nature of electrically and thermally induced charge current fluctuations
