167,647 research outputs found

    Globalizzazioni. Di Fiore legge Stearns

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    La recensione critica analizza il volume di Peter Stearns (Globalization in World History, Routledge, New York 2010) che s’inserisce all’interno del dibattito sul timing della globalizzazione, ampiamente tematizzato nell’ambito della world history. Ripercorrendo le diverse ipotesi cronologiche, che vorrebbero alternativamente la globalizzazione un fenomeno individuabile solo a partire dagli anni Cinquanta del Novecento, o all’estremo opposto, un processo databile a 5000 anni fa, l’autore evidenzia soprattutto come la globalizzazione, lungi dall’essere considerata un processo lineare teleologicamente diretto ad una sempre maggiore integrazione del mondo fino agli esiti odierni, vada interpretato in termini di fasi storiche, caratterizzate da accelerazioni nel processo di integrazione planetaria così come da fratture e discontinuità

    "Durante" nel "Fiore": allusione all'autore o solo nome di personaggio?

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    “Durante” in the Fiore: allusion to the author or only a character’s name? · In this article, it is observed that the author of the Fiore eliminates all the elements that allowed a clear identification of the names of the authors in the Roman de la Rose. It seems then more likely that the name “Durante” refers exclusively to the protagonist and narrator, and not to the author of the 232 sonnets

    Struttura del fiore

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    Biologia vegetale. Tav.VII. Fig.1.Ovario supero (fiore ipogino). Fig.2. Ovario medio (fiore perigino). Fig.3. Ovario medio (fiore perigino). Fig.4. Ovario infero (fiore epigino). Fig.5. Stame di Giusquiamo visto dall\u27interno (Hyoscyamus niger) Solanacee. Fig.6. Lo stesso stame visto dall\u27esterno. Fig.7. Sezione trasversale dell\u27antera di Giusquiamo. Fig.8. Particolare della stessa sezione.Fig.9. Porzione di un granello di polline di Malva (Malva silvestris) Malvacee. Fig.10. Il medesimo granello a più forte ingrandimento.Pulito nel 201

    The x_i-eigenvalue problem on some new fuzzy spheres

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    We study the eigenvalue equation for the "Cartesian coordinates" observables x_i (i=1,2) on the fully O(2)-covariant fuzzy circle S^1_L and x_i (i=1,2,3) on the fully O(3)-covariant fuzzy 2-sphere S^2_L introduced in [G. Fiore, F. Pisacane, J. Geom. Phys. 132 (2018), 423-451]. We show that the spectrum and eigenvectors of x_i ful fill a number of properties which are expected for x_i to approximate well the corresponding coordinate operator of a quantum particle forced to stay on the unit sphere

    Ordine e disordini in Gioacchino da Fiore

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    Per Gioacchino da Fiore (†1202) il problema dell’ordo e della sua intelligibilità costituisce un tema centrale e quasi ossessivo. Lo ritroviamo nella sua opera in molte declinazioni: nel suo metodo di interpretazione delle Scritture secondo la «concordia» fra Antico e Nuovo Testamento; nei suoi diagrammi; nell’organizzazione concreta o ideale delle forme di vita religiosa da lui immaginate; nelle sue osservazioni sul suo tempo e i suoi conflitti, ritenuti segni della prossima fine dei tempi. I contributi raccolti nel volume esplorano questi diversi aspetti, ponendo una particolare attenzione al contesto: il tema dell’ordo percorre tutto il XII secolo; attraverso il punto di vista di Gioacchino – a tratti sconcertante, ma ben radicato nella cultura di quegli anni – possiamo comprendere meglio il suo temp

    Fuzzy hyperspheres via confining potentials and energy cutoffs

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    We simplify and complete the construction of fully O(D)O(D)-equivariant fuzzy spheres SLdS^d_L, for all dimensions dD1d\equiv D-1, initiated in [G. Fiore, F. Pisacane, J. Geom. Phys. 132 (2018), 423]. This is based on imposing a suitable energy cutoff on a quantum particle in RD\mathbb{R}^D in a confining potential well V(r)V(r) with a very sharp minimum on the sphere of radius r=1r=1; the cutoff and the depth of the well diverge with LNL\in\mathbb{N}. As a result, the noncommutative Cartesian coordinates xi\overline{x}^i generate the whole algebra of observables ALA_L on the Hilbert space HLH_L; HLH_L can be recovered applying polynomials in the xi\overline{x}^i to any of its elements. The commutators of the xi\overline{x}^i are proportional to the angular momentum components, as in Snyder noncommutative spaces. HLH_L, as carrier space of a reducible representation of O(D)O(D), is isomorphic to the space of harmonic homogeneous polynomials of degree LL in the Cartesian coordinates of (commutative) RD+1\mathbb{R}^{D+1}, which carries an irreducible representation πL{\bf\pi}_L of O(D+1)O(D)O(D+1)\supset O(D). Moreover, ALA_L is isomorphic to πL(Uso(D+1)){\bf\pi}_L\left(Uso(D+1)\right). We resp. interpret {HL}LN\{H_L\}_{L\in\mathbb{N}}, {AL}LN\{A_L\}_{L\in\mathbb{N}} as fuzzy deformations of the space Hs:=L2(Sd)H_s:={\cal L}^2(S^d) of (square integrable) functions on SdS^d and of the associated algebra AsA_s of observables, because they resp. go to Hs,AsH_s,A_s as LL diverges (with \hbar fixed). With suitable =(L)L0\hbar=\hbar(L)\stackrel{L\to\infty}{\longrightarrow} 0, in the same limit ALA_L goes to the (algebra of functions on the) Poisson manifold TSdT^*S^d; more formally, {AL}LN\{A_L\}_{L\in\mathbb{N}} yields a fuzzy quantization of a coadjoint orbit of O(D+1)O(D+1) that goes to the classical phase space TSdT^*S^d.Comment: Latex file, 42 pages, 3 figures. Final version accepted in the Special Issue "Noncommutative Geometry in Physics" of J. Phys. A: Math. Theo

    Giovanni Candeago “Fiore”

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    Giovanni Candeago “Fiore”, impiccato per rappresaglia dai tedeschi in località Bosco delle Castagne (Belluno) il 10 marzo 1945.Fotografia in bianco e nero - un duplicato di dimensione 100 x 145 mm

    On localized and coherent states on some new fuzzy spheres

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    We construct various systems of coherent states (SCS) on the O(D)-equivariant fuzzy spheres S^d_L (d = 1; 2, D = d+1) constructed in [G. Fiore, F. Pisacane, J. Geom. Phys. 132 (2018), 423-451] and study their localizations in con guration space as well as angular momentum space. These localizations are best expressed through the O(D)-invariant square space and angular momentum uncertainties (x)2; (L)2 in the ambient Euclidean space R^D. We also determine general bounds (e.g. uncertainty relations from commutation relations) for (Delta x)^2; (Delta L)^2, and partly investigate which SCS may saturate these bounds. In particular, we determine O(D)-equivariant systems of optimally localized coherent states, which are the closest quantum states to the classical states (i.e. points) of Sd. We compare the results with their analogs on commutative Sd. We also show that on S^2_L our optimally localized states are better localized than those on the Madore-Hoppe fuzzy sphere with the same cutoff

    Variations on the Author

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    “Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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