206,698 research outputs found
Minimal index and braided subfactors
No full textThe minimal index is shown to be multiplicative: if M1 ⊂ M2 ⊂ M3 are factors, then Ind(M1, M3) = Ind(M1, M2) Ind(M2, M3), extending a previous result (H. Kosaki and R. Longo, J. Funct. Anal. 107 (1992), 458-470). If M is an infinite factor, it follows that the dimension (the square root of the index) is an involutive homomorphism d: SectO(M) → R+ of the semiring of sectors with finite index. The result is applied to the study of the class of endomorphisms with a braid group symmetry that satisfies the relation between index and statistics in Quantum Field Theory (R. Longo, Commun. Math. Phys. 126 (1989), 217-247 and 130 (1990), 285-309); the analysis is generalized to this case. For these endomorphisms, the set of possible index values has several gaps besides the Jones restriction, for example, the index does not lie in the interval (4, 3 √2). As a consequence, subfactors arising in low-dimensional Quantum Field Theory cannot be arbitrary. © 1992
Supplementary material to Longo, S., Di Federico, V., Chiapponi, L., Archetti, R.. Experimental verification of power-law non-Newtonian axisymmetric porous gravity currents. Journal of Fluid Mechanics, DOI: 10.1017/jfm.2013.389
No full textSupplementary material to Longo, S., Di Federico, V., Chiapponi, L., Archetti, R.. Experimental verification of power-law non-Newtonian axisymmetric porous gravity currents. Journal of Fluid Mechanics, DOI: 10.1017/jfm.2013.38
ON NOETHER'S THEOREM IN QUANTUM FIELD THEORY
No full textExtending the construction of local generators of symmetries in (S. Doplicher, Commun. Math. Phys. 85 (1982), 73; S. Doplicher and R. Longo, Commun. Math. Phys. 88 (1983), 399) to space-time and supersymmetries, we establish a weak form of Noether's theorem in quantum field theory. We also comment on the physical significance of the “split property,” underlying our analysis, and discuss some local aspects of superselection rules following from our results
Conformal subnets and intermediate subfactors
No full textGiven an irreducible local conformal net A of von Neumann algebras on S1 and a finite-index conformal subnet B ⊂ A, we show that A is completely rational iff B is completely rational. In particular this extends a result of F. Xu for the orbifold construction. By applying previous results of Xu, many coset models turn out to be completely rational and the structure results in [27] hold. Our proofs are based on an analysis of the net inclusion B ⊂ A; among other things we show that, for a fixed interval I, every von Neumann algebra R intermediate between B(I) and A(I) comes from an intermediate conformal net £ between B and A with £(I) = R. We make use of a theorem of Watatani (type II case) and Teruya and Watatani (type III case) on the finiteness of the set script J sign(N, M) of intermediate subfactors in an irreducible inclusion of factors N ⊂ M with finite Jones index [M : N]. We provide a unified proof of this result that gives in particular an explicit bound for the cardinality of script J sign(N, M) which depends only on [M : N]
Supplementary Material available online to "Radial gravity currents in vertically graded porous media: theory and experiments for Newtonian and power-law fluids", V. Di Federico, S. Longo, L. Chiapponi, R. Archetti, V. Ciriello, Advances in Water Resources, DOI: 10.1016/j.advwatres.2014.04.015
No full textSupplementary Material available online to "Radial gravity currents in vertically graded porous media: theory and experiments for Newtonian and power-law fluids", V. Di Federico, S. Longo, L. Chiapponi, R. Archetti, V. Ciriello, Advances in Water Resources, DOI: 10.1016/j.advwatres.2014.04.01
video on the propagation of gravity current in a porous medium
No full textSupplementary material to Longo, S., Di Federico, V., Chiapponi, L., Archetti, R.. Experimental verification of power-law non-Newtonian axisymmetric porous gravity currents. Journal of Fluid Mechanics, DOI: 10.1017/jfm.2013.38
video on the propagation of axisymmetric gravity current in a porous medium
No full textSupplementary material to Supplementary material to Longo, S., Di Federico, V., Chiapponi, L., Archetti, R.. Experimental verification of power-law non-Newtonian axisymmetric porous gravity currents. Journal of Fluid Mechanics, DOI: 10.1017/jfm.2013.38
Dizionario biografico degli italiani
No full textRedattore del Dizionario biografico degli italiani, diretto da R. Romanell
L'Agora del Ceramico e il Kolonos Agoraios. Quadro storico-topografico con i seguenti paragrafi: L'Hephaisteion; La decorazione scultorea e architettonica dell'Hephaisteion; Il gruppo di Efesto e Atene nell'Hephaisteion; Gli Hephaistia; L'Arsenale; Il Great Drain e gli altri condotti di adduzione e di drenaggio dell'Agora; Il cd. Santuario di Apollo Patroos: il tempietto tardoclassico e la precedente struttura absidata; Il cd. sacello/naiskos di Zeus Phratrios e Athena Phratria; Il theatron con gradini in poros e le altre strutture sulle pendici orientali del Kolonos Agoraios; L'Area tra il Metroon ellenistico e il cd. Tempio di Apollo Patroos: resti di un edificio, il pozzo di fusione e il cd. tempio della Meter; Il Vecchio Bouleuterion; Il Nuovo Bouleuterion e il propylon d'ingresso; Il Metroon ellenistico; La Tholos; Il cd Strategheion; Il settore a sud-ovest della Tholos: il recinto e gli horoi dell'Agora; Il settore a sud-ovest della Tholos: la bottega del calzolaio e i resti di altre strutture.
No full textA questão do financiamento de longo prazo no Brasil: uma revisão histórica
No full textTCC (graduação) - Universidade Federal de Santa Catarina. Centro Sócio-Econômico. Economia.No processo de crescimento econômico, principalmente em economias emergentes que necessitam desenvolver o setor de infra-estrutura, o financiamento de longo prazo constitui um mecanismo fundamental para a viabilização de investimentos. A falta de mecanismos internos eficazes de financiamento privado de longo prazo dentro do Sistema Financeiro, ao longo da história, impôs barreiras em relação ao crescimento econômico do Brasil. O baixo crescimento econômico do nosso país durante muitas décadas resulta, em grande parte, de um sistema financeiro subdesenvolvido com claras deficiências no que se refere ao mercado de capitais e ao sistema bancário privado como elementos de suporte para as empresas realizarem seus investimentos. Este trabalho busca analisar o modelo de financiamento adotado no Brasil no século XX, além do papel atual do sistema financeiro doméstico na oferta de crédito privado
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