388 research outputs found
La causa de los ricos o La obligacion y fruto de la limosna ; añadense los tratados del Corazon contrito; la Ley del Imposible ; y el Exorcista Instruido / compuesto todo en italiano por ... Juan Pedro de Pinamonti de la Compañia de Jesus ; y traduzido en español por otro religioso de la misma Compañia
No full textLocalización: S-B-3155 . Enc. perg . Ex-libris ms. "De la Libreria del Real Collegio de la Annunciacion de Murcia" ; Sello de la Biblioteca Provincial de Murcia; Contiene: Breve compendio de la Vida del Padre Juan Pedro Pinamonti p.[17-32
Symmetry results for stable and monotone solutions to fibered systems of PDEs
No full textWe study the symmetry properties for solutions of elliptic systems of the type [eqution presnted] We obtain a Poincaré-type formula for the solutions of the system and we use it to prove a symmetry result both for stable and for monotone solutions
AMMINOACIDI LIBERI IN CASTE E STADI DIVERSI DI KALOTERMES FLAVICOLLIS FABR. (ISOPTERA)
No full textil contenuto in amminoacidi liberi di caste e stadi diversi di Kalotermes flavicollis è stato determinato con la separazione cromatografica su carta
North e Kubrick tra Ligeti e Vaughan Williams per la colonna sonora di 2001
No full textThe story of the missed collaboration between Alex North and Stanley Kubrick for the soundtrack of the film 2001: A Space Odyssey (1968) is faced, in the light of the recently recorded North score for the film. The score highlights not only the too close analogies of North’s various music cues with the temporary tracks chosen by Kubrick but also their original position in the film; film that has suffered until the last many changes. In this research, an aspect that has not been investigated so far has emerged- that of the relationship between North’s music and that of Vaughan Williams, author of the soundtrack for Charles Frend’s film Scott of Antartic (1948). This film curiously has some similarities with Kubrick’s masterpiece, montage of photographic images with special effects, prevalence in the mixing of ‘natural’ noises over music. Furthermore, the analysis of the soundtrack, made from the composer’s point of view, does not want to question the integrity of the filmic text, but, in the light of more recent studies (Platte, 2018), open a plural perspective.
Si affronta la vicenda della mancata collaborazione tra North e Kubrick per la colonna sonora del film 2001: A Space Odyssey (1968), alla luce della partitura di North recentemente incisa. Si evidenziano così non solo le troppo strette analogie dei vari music cues di North con le temporary tracks scelte da Kubrick ma anche la loro posizione originaria nel film; film che ha subito sino all’ultimo molti cambiamenti. In tale ricerca è emerso un aspetto poco indagato sinora, quello del rapporto tra la musica di North e quella di Vaughan Williams, autore della colonna sonora per il film di Charles Frend Scott of Antartic (1948). Questo film ha curiosamente alcune analogie con il capolavoro di Kubrick, montaggio di immagini fotografiche con effetti speciali, prevalenza nel mixaggio dei rumori ‘naturali’ sulla musica. Inoltre l’analisi della colonna sonora, fatta dal punto di vista del compositore, non vuole mettere in discussione l’integrità del testo filmico, ma, alla luce di più recenti studi (Platte, 2018), aprire una prospettiva plurale
On the Applications of Semiclassical Gravity in Cosmology and Black Hole Physics
No full textThe subject of this Ph.D thesis is the study of the propagation of a free quantum scalar matter field over a classical curved spacetime in the realms of Cosmology and Black Hole Physics. It gathers the original research activity of the author in the framework of Semiclassical Gravity and Quantum Field Theory in Curved Spacetimes.
In a joint work with N. Pinamonti and D. Siemssen, the author shows the existence and uniqueness of local solutions of the semiclassical Einstein equations in cosmological spacetimes, driven by a free quantum massive scalar field arbitrarily coupled with the background curvature. The remarkable result of the work is to show that the source of regularity issues, which prevents to solve the semiclassical problem directly, is an unbounded operator hidden in the expectation value of the quantum stress-energy. However, this operator admits a more regular inverse, which also respects causality. Thus, the application of its inversion formula to the semiclassical equations allows to formulate a well-posed initial-value problem for local solutions in a small interval of time.
In collaboration with N. Pinamonti, S. Roncallo, and N. Zanghì, the semiclassical approach to gravity is applied in the framework of four-dimensional spherically symmetric black holes, which are characterized by dynamical future, outer, trapping horizons. It is shown that the trace anomaly of the quantum stress-energy tensor for a massless, conformally coupled scalar field can be the source of black hole evaporation, after assuming vacuum-like initial conditions in the past and an auxiliary quantum energy condition outside the horizon. As an example, the rate of evaporation induced by the trace anomaly is explicitly evaluated in the Vaidya spacetime.
Finally, in a joint paper with N. Pinamonti, the author studies the problem of stability of semiclassical solutions with higher-order derivative terms in a toy-model, consisting of a quantum scalar field in interaction with a classical scalar field. This toy-model mimics also the evolution induced by semiclassical Einstein equations in physically relevant backgrounds, such as cosmological spacetimes. The main result states that, if the quantum field is massive, then the back-reaction can restore stability on the classical background for wide choices of the renormalization constants, because linear perturbations with past compact spatial support decay polynomially in
time at large times
Pohozaev-type identities for differential operators driven by homogeneous vector fields
No full textWe prove Pohozaev-type identities for smooth solutions of Euler-Lagrange equations of second and fourth order that arise from functional a depending on homogeneous Hörmander vector fields. We then exploit such integral identities to prove non-existence results for the associated boundary value problems
Perturbative algebraic quantum field theory on quantum spacetime: adiabatic and ultraviolet convergence
No full textThe quantum structure of Spacetime at the Planck scale suggests the use, in defining interactions between fields, of the Quantum Wick product. The resulting theory is ultraviolet finite, but subject to an adiabatic cutoff in time which seems difficult to remove. We solve this problem here by another strategy: the fields at a point in the interaction Lagrangian are replaced by the fields at a quantum point, described by an optimally localized state on QST; the resulting Lagrangian density agrees with the previous one after spacetime integration, but gives rise to a different interaction hamiltonian. But now the methods of perturbative Algebraic Quantum Field Theory can be applied, and produce an ultraviolet finite perturbation expansion of the interacting observables. If the obtained theory is tested in an equilibrium state at finite temperature the adiabatic cutoff in time becomes immaterial, namely it has no effect on the correlation function at any order in perturbation theory. Moreover, the interacting vacuum state can be obtained in the vanishing temperature limit. It is nevertheless important to stress that the use of states which are optimally localized for a given observer brakes Lorentz invariance at the very beginning
Sublinear Equations Driven by Hörmander Operators
No full textWe characterize the existence of a unique positive weak solution for a Dirichlet boundary value problem driven by a linear second-order differential operator modeled on Hörmander vector fields, where the right hand side has sublinear growth
The Equality Case in the Substatic Heintze–Karcher Inequality
No full textWe provide a rigidity statement for the equality case of the Heintze–Karcher inequality in substatic manifolds. We apply such a result in the warped product setting to fully remove assumption (H4) in the celebrated Brendle’s characterization of constant mean curvature hypersurfaces in warped products
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