Results for "Paola Tolomei"

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Some advances on the set covering polyhedron of circulant matricesMay 28 2012Working on the set covering polyhedron of consecutive ones circulant matrices, Argiroffo and Bianchi found a class of facet defining inequalities, induced by a particular family of circulant minors. In this work we extend these results to inequalities ... More
Generalized minor inequalities for the set covering polyhedron related to circulant matricesJun 18 2014We study the set covering polyhedron related to circulant matrices. In particular, our goal is to characterize the first Chv\'atal closure of the usual fractional relaxation. We present a family of valid inequalities that generalizes the family of minor ... More
Circuits and circulant minorsFeb 08 2019Circulant contraction minors play a key role for characterizing ideal circular matrices in terms of minimally non ideal structures. In this article we prove necessary and sufficient conditions for a circular matrix $A$ to have circulant contraction minors ... More
Vertex adjacencies in the set covering polyhedronJun 23 2014Nov 10 2015We describe the adjacency of vertices of the (unbounded version of the) set covering polyhedron, in a similar way to the description given by Chv\'atal for the stable set polytope. We find a sufficient condition for adjacency, and characterize it with ... More
Addendum to Vertex adjacencies in the set covering polyhedronOct 06 2017Jan 04 2018We study the relationship between the vertices of an up-monotone polyhedron $R$ and those of the polytope $P$ obtained by truncating $R$ with the unit hypercube. When $R$ has binary vertices, we characterize the vertices of $P$ in terms of the vertices ... More
The Minor inequalities in the description of the Set Covering Polyhedron of Circulant MatricesJun 06 2012In this work we give a complete description of the set covering polyhedron of circulant matrices $C^k_{sk}$ with $s = 2,3$ and $k\geq 3 $ by linear inequalities. In particular, we prove that every non boolean facet defining inequality is associated with ... More
Vertex adjacencies in the set covering polyhedronJun 23 2014Oct 09 2017We describe the adjacency of vertices of the (unbounded version of the) set covering polyhedron, in a similar way to the description given by Chvatal for the stable set polytope. We find a sufficient condition for adjacency, and characterize it with similar ... More
On dominating set polyhedra of circular interval graphsDec 19 2017Feb 20 2018Clique-node and closed neighborhood matrices of circular interval graphs are circular matrices. The stable set polytope and the dominating set polytope on these graphs are therefore closely related to the set packing polytope and the set covering polyhedron ... More
BeppoSAX Observations of Bright Radio GalaxiesMay 30 2000BeppoSAX observations of Broad Line Radio Galaxies (BLRGs) have shown that they have a considerable variety of spectral properties and important differences with respect to their radio-quiet counter-part Seyfert 1s. In radio galaxies the soft photons ... More
Single particle slow dynamics of confined waterMar 02 2000Molecular dynamics simulations of SPC/E water confined in a Silica pore are presented. The simulations have been performed at different hydration levels and temperatures to study the single-particle dynamics. Due to the confinement and to the presence ... More
A note on Türing's 1936Jul 31 2013T\"uring's argument that there can be no machine computing the diagonal on the enumeration of the computable sequences is not a demonstration.
Spacetime at the Planck Scale: The Quantum Computer ViewApr 07 2003Feb 23 2005We assume that space-time at the Planck scale is discrete, quantised in Planck units and "qubitsed" (each pixel of Planck area encodes one qubit), that is, quantum space-time can be viewed as a quantum computer. Within this model, one finds that quantum ... More
Observational studies of pre-stellar cores and infrared dark cloudsJul 23 2011Stars like our Sun and planets like our Earth form in dense regions within interstellar molecular clouds, called pre-stellar cores (PSCs). PSCs provide the initial conditions in the process of star and planet formation. In the past 15 years, detailed ... More
Beyond UncountableDec 18 2003Jul 03 2006In 1891 Cantor presented two proofs with the purpose to establish a general theorem that any set can be replaced by a set of greater power. Cantor's power set theorem can be considered to be an extension of Cantor's 1891 second proof and its argument ... More
Chemical yields from low- and intermediate-mass starsDec 16 1999We present new sets of chemical yields from low- and intermediate-mass stars with 0.8 Msun <= M <= Mup ~ 5 Msun, and three choices of the metallicity, Z=0.02, Z=0.008, and Z=0.004 (Marigo 2000, in preparation). These are then compared with the yields ... More
Envelope burning over-luminosity: a challenge to synthetic TP-AGB modelsMay 25 1998Until recently synthetic AGB models had not taken into account the break-down of the core mass-luminosity (Mc-L) relation due to the occurrence of envelope burning in the most massive (M > 3.5 Msun) and luminous (Mbol > -6) stars. Marigo et al. (1998) ... More
X-ray emission processes in starsAug 25 2010A decade of X-ray stellar observations with Chandra and XMM-Newton has led to significant advances in our understanding of the physical processes at work in hot (magnetized) plasmas in stars and their immediate environment, providing new perspectives ... More
Population synthesis models including AGB stars and their ingredientsJan 18 2007I will briefly review the state of the art of evolutionary population synthesis (EPS) models that include the contribution from AGB stars.
Cold Dark Matter from the Hidden SectorFeb 29 2012Weakly interacting slim particles (WISPs) such as hidden photons (HP) and axion-like particles (ALPs) have been proposed as cold dark matter candidates. They might be produced non-thermally via the misalignment mechanism, similarly to cold axions. In ... More
Basic Logic and Quantum EntanglementNov 10 2006Feb 05 2007As it is well known, quantum entanglement is one of the most important features of quantum computing, as it leads to massive quantum parallelism, hence to exponential computational speed-up. In a sense, quantum entanglement is considered as an implicit ... More
The non-algorithmic side of the mindJan 15 2012The existence of a non-algorithmic side of the mind, conjectured by Penrose on the basis of G\"odel's first incompleteness theorem, is investigated here in terms of a quantum metalanguage. We suggest that, besides human ordinary thought, which can be ... More
Theoretical Setting of Inner Reversible Quantum MeasurementsJul 16 2005Jan 26 2006We show that any unitary transformation performed on the quantum state of a closed quantum system, describes an inner, reversible, generalized quantum measurement. We also show that under some specific conditions it is possible to perform a unitary transformation ... More
Topological signature in the NEXT high pressure xenon TPCOct 10 2016The NEXT experiment aims to observe the neutrinoless double beta decay of Xe-136 in a high-pressure xenon gas TPC using electroluminescence to amplify the signal from ionization. One of the main advantages of this technology is the possibility to use ... More
Laudal's Lemma in positive characteristicSep 21 2010Laudal's Lemma states that if $C$ is a curve of degree $d > s^2 + 1$ in $\mathbb P^3$ over an algebraically closed field of characteristic 0 such that its plane section is contained in an irreducible curve of degree s, then $C$ lies on a surface of degree ... More
Real Kodaira surfacesApr 21 2004In this paper we give the topological classification of real primary Kodaira surfaces and we describe in detail the structure of the corresponding moduli space. One of the main tools is the orbifold fundamental group of a real variety. Our first result ... More
From SU(2) gauge theory to qubits on the fuzzy sphereMar 31 2013We consider a classical pure SU(2) gauge theory, and make an ansatz, which separates the space-temporal degrees of freedom from the internal ones. This ansatz is gauge-invariant but not Lorentz invariant. In a limit case of the ansatz, obtained through ... More
Quantum Mind from a Classical Field Theory of the BrainApr 13 2011We suggest that, with regard to a theory of quantum mind, brain processes can be described by a classical, dissipative, non-abelian gauge theory. In fact, such a theory has a hidden quantum nature due to its non-abelian character, which is revealed through ... More
I, Quantum Robot: Quantum Mind control on a Quantum ComputerDec 25 2008May 28 2009The logic which describes quantum robots is not orthodox quantum logic, but a deductive calculus which reproduces the quantum tasks (computational processes, and actions) taking into account quantum superposition and quantum entanglement. A way toward ... More
Spin bath narrowing with adaptive parameter estimationMar 07 2012We present a measurement scheme capable of achieving the quantum limit of parameter estimation using an adaptive strategy that minimizes the parameter's variance at each step. The adaptive rule we propose makes the scheme robust against errors, in particular ... More
Difficulties with the QPOs Resonance ModelJan 23 2008High frequency quasi-periodic oscillations (HFQPOs) have been detected in microquasars and neutron star systems. The resonance model suggested by Kluzniak & Abramowicz (2000) explains twin QPOs as two weakly coupled nonlinear resonant epicyclic modes ... More
Dark and luminous matter connections. Towards understanding galaxy evolutionJan 23 2004In this review we outline the major points of ab-initio cosmological models focusing on some galaxy evolution unresolved problems. In particular our knowledge of the star formation rate which leads galaxy evolution, i.e. luminosity, colors and dust enrichment, ... More
On the lifting problem in $\mathbb P^4$ in characteristic $p$Sep 08 2011Given $\mathbb P^4_k$, with $k$ algebraically closed field of characteristic $p>0$, and $X\subset \mathbb P^4_k$ integral surface of degree $d$, let $Y=X\cap H$ be the general hyperplane section of $X$. We suppose that $h^0\mathscr I_Y(s)\ne 0$ and $h^0\mathscr ... More
Beyond UndecidableJun 28 2006The predicate complementary to the well-known Godel's provability predicate is defined. From its recursiveness new consequences concerning the incompleteness argumentation are drawn and extended to new results of consistency, completeness and decidability ... More
Minimax solutions for a problem with sign changing nonlinearity and lack of strict convexityOct 25 2013A result of existence of a nonnegative and a nontrivial solution is proved via critical point theorems for non smooth functionals. The equation considered presents a convex part and a nonlinearity which changes sign.
Chemical yields from low- and intermediate-mass stars: model predictions and basic observational constraintsDec 08 2000In this work we analyse the role of low- and intermediate-mass stars in contributing to the chemical enrichment of the interstellar medium. First we present new sets of stellar yields basing on the results of updated evolutionary calculations, which extend ... More
Quantitative morphology and color gradients of E+A galaxies in distant galaxy clustersJan 20 1997Narrow band multifilter photometry of the galaxy populations of four galaxy clusters at z=0.4-0.5 has provided us with a sample of 73 E+A galaxies which are secure cluster members. For 34 of them HST images are available (WFPC2). We have determined surface ... More
Massive ghost theories with a line of defectsFeb 13 2003Apr 23 2003We study free massive fermionic ghosts, in the presence of an extended line of impurities, relying on the Lagrangian formalism. We propose two distinct defect interactions, respectively, of relevant and marginal nature. The corresponding scattering theories ... More
Asymptotic Giant Branch evolution at varying surface C/O ratio: effects of changes in molecular opacitiesMar 04 2002We investigate the effects of molecular opacities on the evolution of TP-AGB stars that experience the third dredge-up, i.e. with surface abundances of carbon and oxygen varying with time. To this aim, a routine is constructed to derive the molecular ... More
Searching for continuous gravitational wave signals using LIGO and Virgo detectorsJan 25 2012Direct and unequivocal detection of gravitational waves represents a great challenge of contemporary physics and astrophysics. A worldwide effort is currently operating towards this direction, building ever sensitive detectors, improving the modelling ... More
Can the third dredge-up extinguish hot-bottom burning in massive AGB stars?Feb 27 2007Marigo (2002) has highlighted the crucial importance of molecular opacities in modelling the evolution of AGB stars at varying surface C/O ratio. In particular, it has been shown the large inadequacy of solar-scaled opacities when applied to models of ... More
Twin peaks kHz QPOs: mathematics of the 3:2 orbital resonanceMar 15 2004Mar 11 2005Using the method of multiple scales, one can derive an analytic solution that describes the behaviour of weakly coupled, non-linear oscillations in nearly Keplerian discs around neutron stars or black holes close to the 3:2 orbital epicyclic resonance. ... More
Low Energy Kaon Physics at Da$Φ$NEMay 15 2003May 21 2012DA$\Phi$NE $e^+ e^-$ collider is an abundant source of low energy $K \bar K$ pairs suitable to explore different fields of non perturbative QCD regime. Two different experiments, DEAR and FINUDA, using different experimental techniq ues are trying to ... More
Dynamic fluctuations in a Short-Range Spin Glass modelJan 09 1995Mar 07 1996We study the dynamic fluctuations of the soft-spin version of the Edwards-Anderson model in the critical region for $T\rightarrow T_{c}^{+}$. First we solve the infinite-range limit of the model using the random matrix method. We define the static and ... More
Computability at the Planck scaleDec 15 2004Mar 07 2005We consider the issue of computability at the most fundamental level of physical reality: the Planck scale. To this aim, we consider the theoretical model of a quantum computer on a non commutative space background, which is a computational model for ... More
Element abundances in X-ray emitting plasmas in starsDec 01 2010Studies of element abundances in stars are of fundamental interest for their impact in a wide astrophysical context, from our understanding of galactic chemistry and its evolution, to their effect on models of stellar interiors, to the influence of the ... More
Calibrating the role of TP-AGB stars in the cosmic matter cycleNov 12 2014In the last ten years three main facts about the thermally pulsing asymptotic giant branch (TP-AGB) have become evident: 1) the modelling of the TP-AGB phase is critical for the derivation of basic galaxy properties (e.g. mass and age) up to high redshift, ... More
Chemical processes in star forming regionsApr 13 2005This paper will review the basic concepts of gas-phase and grain surface chemistry of dense molecular clouds, where low mass and high mass stars form. The chemistry of cold pre-stellar cloud cores, where molecular freeze-out and deuterium fractionation ... More
Deuterated molecules as a probe of ionization fraction in dense interstellar cloudsApr 08 2002Deuterium fractionation in molecular ions, in particular HCO+, has been extensively used to estimate the degree of ionization in molecular clouds. This paper reviews recent work on ionization degree in homogeneous clouds. We will show that the N(DCO+)/N(HCO+) ... More
Type 1 AGN and their Link to ULIRGSNov 07 2001Increasing observational evidence supports a picture for a close link among AGN phenomenum, star-formation processes and galaxy formation. Since the physical phenomena related to the onset of both AGN and star formation are very likely characterized by ... More
Aharonov-Bohm Effect and Hidden PhotonsSep 17 2013Signs of hypothetical light gauge bosons from a hidden sector may appear in Aharonov-Bohm-like experiments. The absence of signal in carried on experiments allow us to set a modest constraint to the mass and coupling constant of these particles. Our findings ... More
The Uncertainty Relation for Quantum propositionsDec 12 2011Logical propositions with the fuzzy modality "Probably" are shown to obey an uncertainty principle very similar to that of Quantum Optics. In the case of such propositions, the partial truth values are in fact probabilities. The corresponding assertions ... More
From Quantum Metalanguage to the Logic of QubitsMar 31 2010The main aim of this thesis is to look for a logical deductive calculus (we will adopt sequent calculus, originally introduced in Gentzen, 1935), which could describe quantum information and its properties. More precisely, we intended to describe in logical ... More
Walking on SR-automata to detect grammar ambiguityFeb 07 2019We exploit the nondeterminism of LR parsing tables to reason about grammar ambiguity after a conflict-driven strategy. First, from parsing tables we define specialized structures, called SR-automata. Next, we search for ambiguous words along the paths ... More
How to release Frege's system from Russell's antinomyMay 07 2007May 10 2007The conditions for proper definitions in mathematics are given, in terms of the theory of definition, on the basis of the criterions of eliminability and non-creativity. As a definition, Russell's antinomy is a violation of the criterion of eliminability ... More
A note on Türing's 1936Jul 31 2013Jun 12 2018T\"uring's argument that there can be no machine computing the diagonal on the enumeration of the computable sequences is not a demonstration.
On a plane section of an integral curve in positive characteristicSep 21 2010If $C \subset P^3_k$ is an integral curve and $k$ an algebraically closed field of characteristic 0, it is known that the points of the general plane section $C \cap H$ of $C$ are in uniform position. From this it follows easily that the general minimal ... More
Local order in aqueous solutions of rare gases and the role of the solute concentration: a computer simulation study with a polarizable potentialNov 05 2004Aqueous solutions of rare gases are studied by computer simulation employing a polarizable potential for both water and solutes. The use of a polarizable potential allows to study the systems from ambient to supercritical conditions for water. In particular ... More
A census of genus two 3-manifolds up to 42 coloured tetrahedraFeb 03 2009We improve and extend to the non-orientable case a recent result of Karabas, Malicki and Nedela concerning the classification of all orientable prime 3-manifolds of Heegaard genus two, triangulated with at most 42 coloured tetrahedra.
Nonorientable 3-manifolds admitting coloured triangulations with at most 30 tetrahedraMay 10 2007We present the census of all non-orientable, closed, connected 3-manifolds admitting a rigid crystallization with at most 30 vertices. In order to obtain the above result, we generate, manipulate and compare, by suitable computer procedures, all rigid ... More
Shimura varieties in the Torelli locus via Galois coverings of elliptic curvesAug 04 2015Nov 03 2015We study Shimura subvarieties of $\mathsf{A}_g$ obtained from families of Galois coverings $f: C \rightarrow C'$ where $C'$ is a smooth complex projective curve of genus $g' \geq 1$ and $g= g(C)$. We give the complete list of all such families that satisfy ... More
On the Correct Estimate of the Probability of False Detection of the Matched Filter in Weak-Signal Detection ProblemsFeb 07 2016The detection reliability of weak signals is a critical issue in many astronomical contexts and may have severe consequences for determining number counts and luminosity functions, but also for optimising the use of telescope time in follow-up observations. ... More
On the Proof Complexity of Deep InferenceSep 08 2007Apr 19 2009We obtain two results about the proof complexity of deep inference: 1) deep-inference proof systems are as powerful as Frege ones, even when both are extended with the Tseitin extension rule or with the substitution rule; 2) there are analytic deep-inference ... More
Decay properties for functions of matrices over $C^*$-algebrasJul 26 2013We extend previous results on the exponential off-diagonal decay of the entries of analytic functions of banded and sparse matrices to the case where the matrix entries are elements of a $C^*$-algebra.
Modeling and Estimation of Discrete-Time Reciprocal Processes via Probabilistic Graphical ModelsMar 14 2016May 13 2016Reciprocal processes are acausal generalizations of Markov processes introduced by Bernstein in 1932. In the literature, a significant amount of attention has been focused on developing dynamical models for reciprocal processes. In this paper, we provide ... More
Dynamics and Depletion in Thermally Supercritical Starless CoresAug 17 2009Nov 18 2009In previous studies we identified two classes of starless cores, thermally subcritical and supercritical, distinguished by different dynamical behavior and internal structure. Here we study the evolution of the dynamically-unstable, thermally-supercritical ... More
Uniform electron gas from two-particle wavefunctionsNov 08 2001An approximation for the unknown two-electron wavefunctions (geminals) of the interacting uniform electron gas is found, starting from the effective screened Coulomb potential proposed by Overhauser [Can. J. Phys. 73, 683 (1995)]. The short-range part ... More
Decision Theoretic Foundations of Graphical Model SelectionJan 30 2013This paper describes a decision theoretic formulation of learning the graphical structure of a Bayesian Belief Network from data. This framework subsumes the standard Bayesian approach of choosing the model with the largest posterior probability as the ... More
The effect of radiation pressure on emission line profiles and black hole mass determination in active galactic nucleiJun 17 2010Sep 16 2010We present a new analysis of the motion of broad line region (BLR) clouds in active galactic nuclei (AGNs) taking into account the combined influence of gravity and radiation pressure force. We calculate cloud orbits under a large range of conditions ... More
Observability of rectangular membranes and plates on small setsAug 21 2013Since the works of Haraux and Jaffard we know that rectangular plates may be observed by subregions not satisfying the geometrical control condition. We improve these results by observing only on an arbitrarily short segment inside the domain. The estimates ... More
Nodal Lengths in Shrinking Domains for Random Eigenfunctions on $\mathbb{S}^2$Jul 31 2018We investigate the asymptotic behavior of the nodal lines for random spherical harmonics restricted to shrinking domains, in the 2-dimensional case: i.e., the length of the zero set $\mathcal{Z}_{\ell,r_\ell} := \mathcal{Z}^{B_{r_{\ell}}}(T_\ell)=\text{len}(\{x ... More
Curve shortening flow coupled to lateral diffusionOct 21 2015We present and analyze a semi-discrete finite element scheme for a system consisting of a geometric evolution equation for a curve and a parabolic equation on the evolving curve. More precisely, curve shortening flow with a forcing term that depends on ... More
On the Koszul cohomology of canonical and Prym-canonical binary curvesJul 13 2012Mar 04 2013In this paper we study Koszul cohomology and the Green and Prym-Green conjectures for canonical and Prym-canonical binary curves. We prove that if property $N_p$ holds for a canonical or a Prym-canonical binary curve of genus $g$ then it holds for a generic ... More
Invariant submanifolds of metric contact pairsSep 03 2015We show that $\phi$-invariant submanifolds of metric contact pairs with orthogonal characteristic foliations make constant angles with the Reeb vector fields. Our main result is that for the normal case such submanifolds of dimension at least $2$ are ... More
Rigid gems in dimension nMay 03 2011We extend to dimension $n \geq 3$ the concept of $\rho$-pair in a coloured graph and we prove the existence theorem for minimal rigid crystallizations of handle-free, closed $n$-manifolds.
Deformation in the large of some complex manifolds, IIJul 25 2005The compact complex manifolds considered in this article are principal torus bundles over a torus. We consider the Kodaira Spencer map of the complete Appell Humbert family (introduced by the first author in Part I) and are able to show that we obtain ... More
Generalized companion matrix for approximate GCDFeb 09 2011We study a variant of the univariate approximate GCD problem, where the coefficients of one polynomial f(x)are known exactly, whereas the coefficients of the second polynomial g(x)may be perturbed. Our approach relies on the properties of the matrix which ... More
Phantom evolving wormholes with big rip singularitiesFeb 15 2013We investigate a family of inhomogeneous and anisotropic gravitational fields exhibiting a future singularity at a finite value of the proper time. The studied spherically symmetric spacetimes are asymptotically Friedmann-Robertson-Walker at spatial infinity ... More
Convective-Dynamical Instability in Radiation-Supported Accretion DisksMar 20 2000We study radiation-hydrodynamical normal modes of radiation-supported accretion disks in the WKB limit. It has long been known that in the large optical depth limit the standard equilibrium is unstable to convection. We study how the growth rate depends ... More
The Effect of Dust on Photometric Redshift Measurement; A Self-consistent TechniqueAug 01 2000A new method is developed for estimating photometric redshifts to galaxies, using realistic template SEDs, extending over four decades in wavelength (i.e. from 0.05 micron to 1 mm). The template SEDs are constructed for four different spectral types of ... More
Root polytopes and Borel subalgebrasMar 04 2012Apr 16 2014Let $\Phi$ be a finite crystallographic irreducible root system and $\mathcal P_{\Phi}$ be the convex hull of the roots in $\Phi$. We give a uniform explicit description of the polytope $\mathcal P_{\Phi}$, analyze the algebraic-combinatorial structure ... More
Mixed-state quantum transport in correlated spin networksApr 05 2012Quantum spin networks can be used to transport information between separated registers in a quantum information processor. To find a practical implementation, the strict requirements of ideal models for perfect state transfer need to be relaxed, allowing ... More
Dust properties along anomalous extinction sightlines. II. Studying extinction curves with dust modelsNov 23 2010The large majority of extinction sight lines in our Galaxy obey a simple relation depending on one parameter, the total-to-selective extinction coefficient, Rv. Different values of Rv are able to match the whole extinction curve through different environments ... More
Asymptotic Giant Branch stars at low metallicity: the challenging interplay between mass loss and molecular opacitiesJul 15 2010We investigate the main physical properties of low-metallicity Asymptotic Giant Branch stars, with the aim of quantifying the uncertainties that presently affect the predicted chemical yields of these stars, associated to mass loss and description of ... More
Black Hole Solutions for Scale Dependent Couplings: The de Sitter and the Reissner-Nordström CaseJan 05 2015Jan 08 2015Allowing for scale dependence of the gravitational couplings leads to a generalization of the corresponding field equations. In this work, those equations are solved for the Einstein-Hilbert and the Einstein-Maxwell case, leading to generalizations of ... More
On the Maximum Entropy Property of the First-Order Stable Spline Kernel and its ImplicationsJun 22 2014Sep 21 2014A new nonparametric approach for system identification has been recently proposed where the impulse response is seen as the realization of a zero--mean Gaussian process whose covariance, the so--called stable spline kernel, guarantees that the impulse ... More
Dark-energy constraints with ALMA polarization measurementsMar 02 2007The Cosmic Microwave Background (CMB) physics can be used to constrain the dark energy dynamics: B modes of the polarization of the diffuse CMB emission as well as the polarized signal towards clusters of galaxies are sensitive to the Hubble expansion ... More
Compact groups in the UZC galaxy sampleMar 12 2002Applying an automatic neighbour search algorithm to the 3D UZC galaxy catalogue (Falco 1999) we have identified 291 compact groups (CGs) with redshifts between 1000 and 10000 km/s. The sample is analysed to investigate whether Triplets display kinematical ... More
A Modified ICA Approach for Signal Separation in CMB MapsFeb 04 2008AIMS: One of the most challenging and important problem of digital signal processing in Cosmology is the separation of foreground contamination from cosmic microwave background (CMB). This problem becomes even more difficult in situations, as the CMB ... More
Logical Interpretation of a Reversible Measurement in Quantum ComputingAug 11 2004Feb 08 2005We give the logical description of a new kind of quantum measurement that is a reversible operation performed by an hypothetical insider observer, or, which is the same, a quantum measurement made in a quantum space background, like the fuzzy sphere. ... More
Brain-Computer Interfaces and Quantum RobotsSep 08 2009The actual (classical) Brain-Computer Interface attempts to use brain signals to drive suitable actuators performing the actions corresponding to subject's intention. However this goal is not fully reached, and when BCI works, it does only in particular ... More
Qubits and Quantum SpacesJun 22 2004Jul 06 2004We consider the quantum computational process as viewed by an insider observer: this is equivalent to an isomorphism between the quantum computer and a quantum space, namely the fuzzy sphere. The result is the formulation of a reversible quantum measurement ... More
Electromagnetic fields in Schwarzschild and Reissner-Nordström geometry. Quantum corrections to the black hole entropyJun 10 1997Using standard coordinates, the Maxwell equations in the Reissner-Nordstr\"om geometry are written in terms of a couple of scalar fields satisfying Klein-Gordon like equations. The density of states is derived in the semi-classical approximation and the ... More
Mathematical modeling of local perfusion in large distensible microvascular networksSep 28 2016Microvessels -blood vessels with diameter less than 200 microns- form large, intricate networks organized into arterioles, capillaries and venules. In these networks, the distribution of flow and pressure drop is a highly interlaced function of single ... More
Accretion of a relativistic, collisionless kinetic gas into a Schwarzschild black holeNov 08 2016We provide a systematic study for the accretion of a collisionless, relativistic kinetic gas into a nonrotating black hole. To this end, we first solve the relativistic Liouville equation on a Schwarzschild background spacetime. The most general solution ... More
Relative Entanglement Entropies in 1+1-dimensional conformal field theoriesDec 02 2016We study the relative entanglement entropies of one interval between excited states of a 1+1 dimensional conformal field theory (CFT). To compute the relative entropy $S(\rho_1 \| \rho_0)$ between two given reduced density matrices $\rho_1$ and $\rho_0$ ... More
Charge asymmetry of top quarksJun 29 2010The LHC is a promising machine to discover new physics in the top sector. There are several models that predict the existence of heavy colored resonances decaying to top quarks in the TeV energy range. The production of such resonances might generate ... More
Well-posedness of IBVP for 1D scalar non-local conservation lawsNov 22 2018We consider the initial boundary value problem (IBVP) for a non-local scalar conservation laws in one space dimension. The non-local operator in the flux function is not a mere convolution product, but it is assumed to be aware of boundaries. Introducing ... More
Quantification of Model Uncertainty in RANS Simulations: A ReviewJun 27 2018Sep 27 2018In computational fluid dynamics simulations of industrial flows, models based on the Reynolds-averaged Navier--Stokes (RANS) equations are expected to play an important role in decades to come. However, model uncertainties are still a major obstacle for ... More
A Bernstein type inequalityMar 05 2010We formulate and discuss a conjecture which would extend a classical inequality of Bernstein.
Comparison principles and Dirichlet problem for equations of Monge-Ampere type associated to vector fieldsDec 22 2009We study the Dirichlet problem for subelliptic partial differential equations of Monge-Ampere type involving the derivates with respect to a family X of vector fields of Carnot type. The main result is a comparison principle among viscosity subsolutions, ... More