Results for "Enrico M. Malatesta"

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The Random Fractional Matching ProblemFeb 08 2018We consider two formulations of the random-link fractional matching problem, a relaxed version of the more standard random-link (integer) matching problem. In one formulation, we allow each node to be linked to itself in the optimal matching configuration. ... More
Solution for a Bipartite Euclidean TSP in one dimensionFeb 05 2018The travelling salesman problem is one of the most studied combinatorial optimization problems, because of the simplicity in its statement and the difficulty in its solution. We characterize the optimal cycle for every convex and increasing cost function ... More
Quantum Monte Carlo Study of electrons in low dimensionsDec 19 1999We report on a diffusion Monte Carlo investigation of model electron systems in low dimensions, which should be relevant to the physics of systems obtainable nowadays in semiconductor heterostructures. In particular, we present results for a one dimensional ... More
Characterization of a photon counting EMCCD for space-based high contrast imaging spectroscopy of extrasolar planetsJul 02 2014Aug 11 2014We present the progress of characterization of a low-noise, photon counting Electron Multiplying Charged Coupled Device (EMCCD) operating in optical wavelengths and demonstrate possible solutions to the problems of Clock-Induced Charge (CIC) and other ... More
Beam Models for Gamma-Ray Bursts Sources: Outflow Structure, Kinematics and Emission MechanismsMar 25 2002Jul 27 2002The variety of gamma-ray burst phenomenology could be largely attributable to differences in the opening angle of an isotropic outflow or to a standard type of event viewed from different orientations. Motivated by this currently popular idea, we study ... More
Smooth surjections and surjective restrictionsJul 06 2016Given a surjective mapping $f : E \to F$ between Banach spaces, we investigate the existence of a subspace $G$ of $E$, with the same density character as $F$, such that the restriction of $f$ to $G$ remains surjective. We obtain a positive answer whenever ... More
Kepler Flares II: The Temporal Morphology of White-Light Flares on GJ 1243Nov 13 2014We present the largest sample of flares ever compiled for a single M dwarf, the active M4 star GJ 1243. Over 6100 individual flare events, with energies ranging from $10^{29}$ to $10^{33}$ erg, are found in 11 months of 1-minute cadence data from Kepler. ... More
Spontaneous interlayer superfluidity in bilayer systems of cold polar moleculesNov 08 2009Dec 15 2010Quantum degenerate cold-atom gases provide a remarkable opportunity to study strongly interacting systems. Recent experimental progress in producing ultracold polar molecules with a net electric dipole moment opens up new possibilities to realize novel ... More
Peano on definition of surface areaDec 08 2014In this paper we investigate the evolution of the concept of area in Peano's works, taking into account the main role played by Grassmann's geometric-vector calculus and Peano's theory on derivative of measures. Geometric (1887) and bi-vectorial (1888) ... More
Multimodal Differential Emission Measure in the Solar CoronaMar 09 2015The Atmospheric Imaging Assembly (AIA) telescope on board the Solar Dynamics Observatory (SDO) provides coronal EUV imaging over a broader temperature sensitivity range than the previous generations of instruments (EUVI, EIT, and TRACE). Differential ... More
Cosmological Aspects of Gamma-Ray Bursts: Luminosity Evolution and an Estimate of the Star Formation Rate at High RedshiftsAug 11 2001Apr 01 2002Using 220 Gamma-Ray Burst (GRB) redshifts and luminosities derived from the luminosity-variability relationship of Fenimore & Ramirez-Ruiz (2000), we show that there exists a significant correlation between the GRB luminosity and redshift. In particular, ... More
Reduction theory for mapping class groups and applications to moduli spacesJan 10 2008Let $S=S_{g,p}$ be a compact, orientable surface of genus $g$ with $p$ punctures and such that $d(S):=3g-3+p>0$. The mapping class group $\textup{Mod}_S$ acts properly discontinuously on the Teichm\"uller space $\mathcal T(S)$ of marked hyperbolic structures ... More
Peano on derivative of measures, strict derivative of distributive set functionsFeb 22 2010By retracing research on coexistent magnitudes (grandeurs coexistantes) by Cauchy (1841), Peano in "Applicazioni geometriche del calcolo infinitesimale" (1887) defines the "density" (strict derivative) of a "mass" (a distributive set function) with respect ... More
Dual properties and joint spectra for solvable Lie algebras of operatorsOct 04 2015Given $L$ a solvable Lie Algebra of operators acting on a Banach space $E$, we study the action of the opposite algebra of $L$, $L'$, on $E^*$. Moreover, we extend S{\l}odkowski joint spectra, $\sigma_{\delta,k}$, $\sigma_{\pi,k}$, and we study its usual ... More
Joint spectra of the tensor product representation of the direct sum of two solvable Lie algebrasAug 12 2016Given two complex Banach spaces $X_1$ and $X_2$, a tensor product $X_1\tilde{\otimes} X_2$ of $X_1$ and $X_2$ in the sense of [14], two complex solvable finite dimensional Lie algebras $L_1$ and $L_2$, and two representations $\rho_i\colon L_i\to {\rm ... More
Joint spectra and nilpotent Lie algebras of linear transformationsFeb 16 2016Given a complex nilpotent finite dimensional Lie algebra of linear transformations $L$, in a complex finite dimensional vector space $E$, we study the joint spectra $Sp(L,E)$, $\sigma_{\delta,k}(L,E)$ and $\sigma_{\pi,k}(L,E)$. We compute them and we ... More
Algebraic Image ProcessingOct 11 2017We propose an approach to image processing related to algebraic operators acting in the space of images. In view of the interest in the applications in optics and computer science, mathematical aspects of the paper have been simplified as much as possible. ... More
Interlayer excitonic superfluidity in grapheneMay 21 2013Dec 06 2013We discuss the conditions under which the predicted (but not yet observed) zero-field interlayer excitonic condensation in double layer graphene has a critical temperature high enough to allow detection. Crucially, disorder arising from charged impurities ... More
Retardation of Bulk Water Dynamics by Disaccharide OsmolytesJul 21 2016The bioprotective nature of disaccharides is hypothesized to derive from the modification of the hydrogen bonding network of water which protects biomolecules through lowered water activity at the protein interface. Using ultrafast fluorescence spectroscopy ... More
Teichmueller space via Kuranishi familiesFeb 15 2007Jan 13 2009We construct Teichmueller space by patching together Kuranishi families. We also discuss the basic properties of Teichmueller space, and in particular show that our construction leads to simplifications in the proof of Teichmueller's theorem asserting ... More
A rigidity property of local cohomology modulesNov 09 2015The relationships between the invariants and the homological properties of $I$, ${\rm Gin}(I)$ and $I^{\rm lex}$ have been studied extensively over the past decades. A result of A. Conca, J. Herzog and T. Hibi points out some rigid behaviours of their ... More
Sequentially Cohen-Macaulay modules and local cohomologyJan 10 2001The main result of the paper states that for a graded ideal I in a polynomial ring R over a field of characteristic 0, the Hilbert functions of the local cohomology modules of R/I and of R/Gin(I) coincide if and only if R/I is sequentially Cohen-Macaulay. ... More
Compressive Signal Processing with Circulant Sensing MatricesMar 12 2014Compressive sensing achieves effective dimensionality reduction of signals, under a sparsity constraint, by means of a small number of random measurements acquired through a sensing matrix. In a signal processing system, the problem arises of processing ... More
Nonlocal diffusion and applicationsApr 30 2015Jun 30 2016We consider the fractional Laplace framework and provide models and theorems related to nonlocal diffusion phenomena. Some applications are presented, including: a simple probabilistic interpretation, water waves, crystal dislocations, nonlocal phase ... More
Fitting Neutrino Physics with a U(1)_R Lepton NumberMar 23 2012Apr 03 2012We study neutrino physics in the context of a supersymmetric model where a continuous R-symmetry is identified with the total Lepton Number and one sneutrino can thus play the role of the down type Higgs. We show that R-breaking effects communicated to ... More
Possible Indications of New Physics in Bd-mixing and in sin(2 beta) DeterminationsMar 30 2008Jul 08 2008Using the hadronic matrix elements from the lattice, B_K and xi_s, involving only the 4-quark operators for Delta flavor (F) = 2 Hamiltonian relevant for K, B_d and B_s mixing, along with V_cb, we deduce a non-trivial constraint on the SM, sin (2 beta) ... More
Weak Equivalence Principle Test on a Sounding RocketAug 04 2010SR-POEM, our principle of equivalence measurement on a sounding rocket, will compare the free fall rate of two substances yielding an uncertainty of E-16 in the estimate of \eta. During the past two years, the design concept has matured and we have been ... More
Voyager 2 solar plasma and magnetic field spectral analysis for intermediate data sparsityAug 24 2015The Voyager probes are the furthest, still active, spacecraft ever launched from Earth. During their 38-year trip, they have collected data regarding solar wind properties (such as the plasma velocity and magnetic field intensity). Unfortunately, a complete ... More
New ways to TeV scale leptogenesisMay 27 2013Jul 31 2013We show that by adding to the standard model plus the type I seesaw different types of scalars, it is possible to construct models that satisfy the three requirements of (i) generating neutrino masses at the TeV scale, (ii) being testable at the LHC via ... More
Reparametrizing loop entropy weights: Effect on DNA melting curvesDec 18 2002Jan 06 2004Recent advances in the understanding of the melting behavior of double-stranded DNA with statistical mechanics methods lead to improved estimates of the weight factors for the dissociation events of the chains, in particular for interior loop melting. ... More
Improved chemical vapor transport growth of transition metal dichalcogenidesJan 22 2014In the crystal growth of transition metal dichalcogenides by the Chemical Vapor Transport method (CVT), the choice of the transport agent plays a key role. We have investigated the effect of various chemical elements and compounds on the growth of TiSe2, ... More
Abelian Carter subgroups in finite permutation groupsMay 27 2013May 28 2013We show that a finite permutation group containing a regular abelian self-normalizing subgroup is soluble.
Regularity properties of nonlocal minimal surfaces via limiting argumentsMay 05 2011Feb 06 2013We prove an improvement of flatness result for nonlocal minimal surfaces which is independent of the fractional parameter $s$ when $s\rightarrow 1^-$. As a consequence, we obtain that all the nonlocal minimal cones are flat and that all the nonlocal minimal ... More
Implications of B -> rho gamma measurements in the Standard Model and Supersymmetric TheoriesJun 25 2002Sep 12 2002We study the implications of the recently improved upper limits on the branching ratios for the decays B -> rho gamma, expressed as R(rho gamma/K^* gamma) = BR(B -> rho gamma)/BR(B -> K^* gamma) <0.047. We work out the constraints that the current bound ... More
Remarks on the static dipole-dipole potential at large distancesJul 26 2015Nov 03 2015We determine the large-distance behaviour of the static dipole-dipole potential for a wide class of gauge theories on nonperturbative grounds, exploiting only general properties of the theory. In the case of QCD, we recover the known results in the regime ... More
High-energy hadron-hadron (dipole-dipole) scattering on the latticeOct 05 2010We will discuss how the problem of high-energy hadron-hadron (dipole-dipole) scattering at low momentum transfer can be approached from the point of view of lattice QCD, by means of Monte Carlo numerical simulations.
The lex-plus-power inequality for local cohomology modulesAug 10 2012Mar 11 2013We prove an inequality between Hilbert functions of local cohomology modules supported in the homogeneous maximal ideal of standard graded algebras over a field, within the framework of embeddings of posets of Hilbert functions. As a main application, ... More
Characteristic-free bounds for the Castelnuovo-Mumford regularityOct 08 2003We study bounds for the Castelnuovo-Mumford regularity of homogeneous ideals in a polynomial ring in terms of the number of variables and the degree of the generators. In particular our aim is to give a positive answer to a question posed by Bayer and ... More
Zero-generic initial idealsMar 21 2013Mar 10 2014Given a homogeneous ideal I of a polynomial ring A=K[X_1,...,X_n] and a monomial order, we construct a new monomial ideal of A associated with I. We call it the zero-generic initial ideal of I with respect to the order and denote it with gin_0(I), or ... More
On the lack of bound states for certain NLS equations on metric graphsApr 21 2016Jul 19 2016The purpose of this paper is to prove some results on the absence of bound states for certain nonlinear Schr\"odinger equations on noncompact metric graphs with localized nonlinearity. In particular, we show how the topological and metric properties of ... More
Rank two vector bundles on polarised Halphen surfaces and the Gauss-Wahl map for du Val curvesSep 29 2016A genus-g du Val curve is a degree-3g plane curve having 8 points of multiplicity g, one point of multiplicity g-1, and no other singularity. We prove that the corank of the Gauss-Wahl map of a general du Val curve of odd genus (>11) is equal to one. ... More
Bound states of the NLS equation on metric graphs with localized nonlinearitiesJun 18 2015Dec 18 2015We investigate the existence of multiple bound states of prescribed mass for the nonlinear Schr\"odinger equation on a noncompact metric graph. The main feature is that the nonlinearity is localized only in a compact part of the graph. Our main result ... More
Lipschitz and path isometric embeddings of metric spacesMay 10 2010Feb 16 2016We prove that each sub-Riemannian manifold can be embedded in some Euclidean space preserving the length of all the curves in the manifold. The result is an extension of Nash $C^1$ Embedding Theorem. For more general metric spaces the same result is false, ... More
Widespread presence of shallow cusps in the surface-brightness profile of globular clustersAug 16 2010Surface brightness profiles of globular clusters with shallow central cusps (Sigma ~ R^v with -0.3<~ v <~ -0.05) have been associated by several recent studies with the presence of a central intermediate mass black hole (IMBH). Such shallow slopes are ... More
Bosons and EnvironmentJun 27 2000The role of background in bosonic quantum statistics is discussed in the frame of a new approach in terms of coherent states. Bosons are indeed detected in different physical situations where they exhibit different and apparently unconnected properties. ... More
The asymptotic Schottky problemNov 25 2008Let $\mathcal M_g$ denote the moduli space of compact Riemann surfaces of genus $g$ and let $\mathcal A_g$ be the space of principally polarized abelian varieties of (complex) dimension $g$. Let $J:\mathcal M_g\longrightarrow \mathcal A_g$ be the map ... More
Is There Flavour Independence in Tensor Glueball Decays?Apr 19 2014The flavour independence hypothesis for (tensor) glueball decays into exclusive final states is not ruled out by the existing data. A new methodology for testing its validity and accuracy is proposed in the framework of a particular mixing scheme. As ... More
Probability matrices, non-negative rank, and parameterizations of mixture modelsNov 02 2009Nov 09 2009In this paper we parameterize non-negative matrices of sum one and rank at most two. More precisely, we give a family of parameterizations using the least possible number of parameters. We also show how these parameterizations relate to a class of statistical ... More
Doubling property for biLipschitz homogeneous geodesic surfacesNov 02 2008Feb 16 2016In this paper we discuss general properties of geodesic surfaces that are locally biLipschitz homogeneous. In particular, we prove that they are locally doubling and that there exists a special doubling measure analogous to the Haar measure for locally ... More
Natural R Parity Conservation with Horizontal Symmetries. a Four Generation ModelNov 08 1994Mar 29 1995In most supersymmetric models the stability of the proton is ensured by invoking R-parity. A necessary ingredient to enforce R-parity is the possibility of distinguishing the lepton superfields from the Higgs ones. This is generally achieved either by ... More
On computing fixed points for generalized sandpilesDec 11 2004We prove fixed points results for sandpiles starting with arbitrary initial conditions. We give an effective algorithm for computing such fixed points, and we refine it in the particular case of SPM.
Fibered knots and links in lens spacesFeb 11 2015We take advantage of the correspondence between fibered links, open book decompositions and contact structures on a closed connected 3-dimensional manifold to determine a mixed link diagram presentation for a particular fibered link $L$ in the lens space ... More
Footprints of the Beyond in flavor physics: Possible role of the Top Two Higgs Doublet ModelJul 01 2007The B-factories results provide an impressive confirmation of the Standard Model (SM) description of flavor and CP violation. Nevertheless, as more data were accumulated, deviations in the 2.5-3.5 sigma range have emerged pointing to the exciting possibility ... More
Getting acquainted with the fractional LaplacianOct 31 2017Jan 29 2018These are the handouts of an undergraduate minicourse at the Universit\`a di Bari, in the context of the 2017 INdAM Intensive Period "Contemporary Research in elliptic PDEs and related topics". Without any intention to serve as a throughout epitome to ... More
A Generalization of the Space-Fractional Poisson Process and its Connection to some Lévy ProcessesFeb 10 2015Jan 08 2016This paper introduces a generalization of the so-called space-fractional Poisson process by extending the difference operator acting on state space present in the associated difference-differential equations to a much more general form. It turns out that ... More
Continuity and density results for a one-phase nonlocal free boundary problemApr 21 2015Mar 01 2016We consider a one-phase nonlocal free boundary problem obtained by the superposition of a fractional Dirichlet energy plus a nonlocal perimeter functional. We prove that the minimizers are H\"older continuous and the free boundary has positive density ... More
Tunable chirality and circular dichroism of a topological insulator with $ C_{2v} $ symmetry as a function of Rashba and Dresselhaus parametersAug 19 2015Aug 26 2015Polarization-sensitive devices rely on meta-materials to exhibit varying degrees of absorption of light of a given handedness. The chiral surface states of a topological insulator(TI) selectively absorb right and left circularly polarized light in the ... More
Hadronic total cross sections, Wilson loop correlators and the QCD spectrumSep 25 2014We show how to obtain rising hadronic total cross sections in QCD, in the framework of the nonperturbative approach to soft high-energy scattering based on Wilson-loop correlators. Total cross sections turn out to be of "Froissart"-type, i.e., the leading ... More
Equivalence of two different notions of tangent bundle on rectifiable metric measure spacesNov 29 2016We prove that for a suitable class of metric measure spaces, the abstract notion of tangent module as defined by the first author can be isometrically identified with the space of $L^2$-sections of the `Gromov-Hausdorff tangent bundle'. The class of spaces ... More
An improved observable for the forward-backward asymmetry in B -> K* l+ l- and Bs -> phi l+ l-Jul 22 2010We study the decay B -> K* l+ l- in the QCD factorization approach and propose a new integrated observable whose dependence on the form factors is almost negligible, consequently the non--perturbative error is significantly reduced and indeed its overall ... More
Two remarks on the Weierstrass flagApr 30 2012We show that the locally closed strata of the Weierstrass flags on the moduli spaces of curves of genus g and on the moduli space of curves of genus g with one marked point are almost never affine.
3D-Barolo: a new 3D algorithm to derive rotation curves of galaxiesMay 28 2015We present 3D-Barolo, a new code that derives rotation curves of galaxies from emission-line observations. This software fits 3D tilted-ring models to spectroscopic data-cubes and can be used with a variety of observations: from HI and molecular lines ... More
Multiple Intelligences and quotient spacesNov 02 2006The Multiple Intelligence Theory (MI) is one of the models that study and describe the cognitive abilities of an individual. In [7] is presented a referential system which allows to identify the Multiple Intelligences of the students of a course and to ... More
Singularities of moduli spaces of sheaves on K3 surfaces and Nakajima quiver varietiesMay 04 2015Jan 18 2016The aim of this paper is to study the singularities of certain moduli spaces of sheaves on K3 surfaces by means of Nakajima quiver varieties. The singularities in question arise from the choice of a non--generic polarization, with respect to which we ... More
Semi-Analytical Minimum Time Solution for the Optimal Control of a Vehicle subject to Limited AccelerationMar 20 2016Apr 10 2016The basic module for the solution of the minimum time optimal control of a car-like vehicle is herein presented. The vehicle is subject to the effect of laminar (linear) and aerodynamic (quadratic) drag, taking into account the asymmetric bounded longitudinal ... More
Spin-orbit coupling mediated tunable electron heat capacity of quantum wellsAug 13 2016Aug 16 2016The heat capacity of conduction electrons obtained from the Sommerfeld expansion is shown to be tunable via the Rashba and Dresselhaus spin-orbit coupling parameters. Using an AlInSb/InSb/AlInSb as a representative heterostructure with alterable well ... More
Scattering times and mobility with localized impurities in topological insulator filmsMay 19 2015The zero gap surface states of a 3D-topological insulator host highly mobile Dirac fermions with spin locked to the momentum. The high mobility attributed to absence of back scattering is reduced in presence of impurities on the surface. In particular, ... More
Preconditioning complex symmetric linear systemsMay 24 2014Jul 14 2014A new polynomial preconditioner for symmetric complex linear systems based on Hermitian and skew-Hermitian splitting (HSS) for complex symmetric linear systems is herein presented. It applies to Conjugate Orthogonal Conjugate Gradient (COCG) or Conjugate ... More
Monomials as sum of k-th powers of formsMay 20 2013Motivated by recent results on the Waring problem for polynomial rings and representation of monomial as sum of powers of linear forms, we consider the problem of presenting monomials of degree kd as sums of k-th powers of forms of degree d. We produce ... More
On the KBSM of links in lens spacesJun 03 2015In this paper the properties of the Kauffman bracket skein module of $L(p,q)$ are investigated. Links in lens spaces are represented both through band and disk diagrams. The possibility to transform between the diagrams enables us to compute the Kauffman ... More
Rigidity results for some boundary quasilinear phase transitionsMar 10 2008We consider a quasilinear equation given in the half-space, i.e. a so called boundary reaction problem. Our concerns are a geometric Poincar\'e inequality and, as a byproduct of this inequality, a result on the symmetry of low-dimensional bounded stable ... More
A Sharp Liouville Theorem for Elliptic OperatorsFeb 16 2010We introduce a new condition on elliptic operators $L= {1/2}\triangle + b \cdot \nabla $ which ensures the validity of the Liouville property for bounded solutions to $Lu=0$ on $\R^d$. Such condition is sharp when $d=1$. We extend our Liouville theorem ... More
Vertex corrections of impurity scattering at a ferromagnetic quantum critical pointApr 01 2009We study the renormalization of a non-magnetic impurity's scattering potential due to the presence of a massless collective spin mode at a ferromagnetic quantum critical point. To this end, we compute the lowest order vertex corrections in two- and three-dimensional ... More
Observational Constraints on Gauge Field Production in Axion InflationMar 27 2012Models of axion inflation are particularly interesting since they provide a natural justification for the flatness of the potential over a super-Planckian distance, namely the approximate shift-symmetry of the inflaton. In addition, most of the observational ... More
Remarks about Besicovitch covering property in Carnot groups of step 3 and higherMar 31 2015We prove that the Besicovitch Covering Property (BCP) does not hold for some classes of homogeneous quasi-distances on Carnot groups of step 3 and higher. As a special case we get that, in Carnot groups of step 3 and higher, BCP is not satisfied for those ... More
Radial Variation in the Stellar Mass Functions of Star ClustersAug 25 2016Aug 29 2016A number of recent observational studies of Galactic globular clusters have measured the variation in the slope of a cluster's stellar mass function $\alpha$ with clustercentric distance $r$. In order to gather a deeper understanding of the information ... More
A Constructive Semantic Characterization of Aggregates in ASPJan 13 2006Feb 08 2006This technical note describes a monotone and continuous fixpoint operator to compute the answer sets of programs with aggregates. The fixpoint operator relies on the notion of aggregate solution. Under certain conditions, this operator behaves identically ... More
Blowing in the Milky Way wind: neutral hydrogen clouds tracing the Galactic nuclear outflowFeb 06 2018We present the results of a new sensitive survey of neutral hydrogen above and below the Galactic Center with the Green Bank Telescope. The observations extend up to Galactic latitude | b | < 10 deg with an effective angular resolution of 9.5' and an ... More
Geometric Constrained Variational Calculus. I. - Piecewise smooth extremalsMar 30 2015A geometric setup for constrained variational calculus is presented. The analysis deals with the study of the extremals of an action functional defined on piecewise differentiable curves, subject to differentiable, non-holonomic constraints. Special attention ... More
Compact steep-spectrum sources as the parent population of flat-spectrum radio-loud NLS1sJan 22 2016May 17 2016Narrow-line Seyfert 1 galaxies (NLS1s) are an interesting subclass of active galactic nuclei (AGN), which tipically does not exhibit any strong radio emission. Seven percent of them, though, are radio-loud and often show a flat radio-spectrum (F-NLS1s). ... More
Gamma Ray Bursts - Maybe not so old after allSep 08 2009The discovery of a short-lived gamma-ray burst at a surprisingly early epoch in the history of the Universe shows how much is still unknown about the evolution of the parent systems of such bursts.
Norm discontinuity and spectral properties of Ornstein-Uhlenbeck semigroupsSep 14 2005Let $E$ be a real Banach space. We study the Ornstein-Uhlenbeck semigroup $P(t)$ associated with the Ornstein-Uhlenbeck operator $$ Lf(x) = \frac12 {\rm Tr} Q D^2 f(x) + <Ax, Df(x)>.$$ Here $Q$ is a positive symmetric operator from $E^*$ to $E$ and $A$ ... More
On the Link Between Energy Equipartition and Radial Variation in the Stellar Mass Function of Star ClustersSep 28 2016We make use of $N$-body simulations to determine the relationship between two observable parameters that are used to quantify mass segregation and energy equipartition in star clusters. Mass segregation can be quantified by measuring how the slope of ... More
Gas accretion from minor mergers in local spiral galaxiesJun 03 2014In this paper we quantify the gas accretion rate from minor mergers onto star-forming galaxies in the Local Universe using HI observations of 148 nearby spiral galaxies (WHISP sample). We developed a dedicated code that iteratively analyses HI data-cubes, ... More
Electrical control of deep NV centers in diamond by means of sub-superficial graphitic micro-electrodesJul 19 2016The control of the charge state of nitrogen-vacancy (NV) centers in diamond is of primary importance for the stabilization of their quantum-optical properties, in applications ranging from quantum sensing to quantum computing. To this purpose, in this ... More
Optomechanical self-structuring in cold atomic gasesAug 06 2013The rapidly developing field of optomechanics aims at the combined control of optical and mechanical (solid-state or atomic) modes. In particular, laser cooled atoms have been used to exploit optomechanical coupling for self-organization in a variety ... More
Planning with Preferences using Logic ProgrammingAug 31 2005We present a declarative language, PP, for the high-level specification of preferences between possible solutions (or trajectories) of a planning problem. This novel language allows users to elegantly express non-trivial, multi-dimensional preferences ... More
Some properties of Hölder surfaces in the Heisenberg groupMay 01 2012It is a folk conjecture that for alpha > 1/2 there is no alpha-Hoelder surface in the subRiemannian Heisenberg group. Namely, it is expected that there is no embedding from an open subset of R^2 into the Heisenberg group that is Hoelder continuous of ... More
The $(b, c)$-inverse in rings and in the Banach contextJul 08 2016In this article the $(b, c)$-inverse will be studied. Several equivalent conditions for the existence of the $(b,c)$-inverse in rings will be given. In particular, the conditions ensuring the existence of the $(b,c)$-inverse, of the annihilator $(b,c)$-inverse ... More
The Ehrenfest urn revisited: Playing the game on a realistic fluid modelDec 02 2005May 16 2007The Ehrenfest urn process, also known as the dogs and fleas model, is realistically simulated by molecular dynamics of the Lennard-Jones fluid. The key variable is Delta z, i.e. the absolute value of the difference between the number of particles in one ... More
Random numbers from the tails of probability distributions using the transformation methodFeb 18 2009The speed of many one-line transformation methods for the production of, for example, Levy alpha-stable random numbers, which generalize Gaussian ones, and Mittag-Leffler random numbers, which generalize exponential ones, is very high and satisfactory ... More
Ahlfors-regular distances on the Heisenberg group without biLipschitz piecesAug 25 2015We show that the Heisenberg group is not minimal in looking down. This answers Problem 11.15 in `Fractured fractals and broken dreams' by David and Semmes, or equivalently, Question 22 and hence also Question 24 in `Thirty-three yes or no questions about ... More
Theory-Agnostic Constraints on Black-Hole Dipole Radiation with Multi-Band Gravitational-Wave AstrophysicsMar 13 2016May 11 2016The aLIGO detection of the black-hole binary GW150914 opened a new era for probing extreme gravity. Many gravity theories predict the emission of dipole gravitational radiation by binaries. This is excluded to high accuracy in binary pulsars, but entire ... More
Implications of the Measured Image Size for the Radio Afterglow of GRB 030329Jul 08 2004Jul 11 2004We use data on the image size of the radio afterglow of GRB 030329 (Taylor et al. 2004) to constrain the physical parameters of this explosion. Together with the observed broad band spectrum, this data over-constrains the physical parameters, thus enabling ... More
Isotopic replacement in ionic systems: the 4He2+ + 3He -> 3He4He+ + 4He reactionNov 22 2005Full quantum dynamics calculations have been carried out for the ionic reaction 4He2+ + 3He and state-to-state reactive probabilities have been obtained using both a time-dependent (TD) and a time-independent (TI) approach. An accurate ab-initio potential ... More
Co-evolution of nuclear star clusters, massive black holes and their host galaxiesJun 05 2015Nov 03 2015Studying how nuclear star clusters (NSCs) form and how they are related to the growth of the central massive black holes (MBHs) and their host galaxies is fundamental for our understanding of the evolution of galaxies and the processes that have shaped ... More
$B \toτ^+ τ^- (X)$ decays: first constraints and phenomenological implicationsJul 31 1996The study of $B \to \tau^+ \tau^- (X)$ decays can provide us with a better understanding of the third generation, and can be a useful probe of physics beyond the standard model. We present a model independent analysis of these decays. We classify new ... More
Evidence of Wave Damping at Low Heights in a Polar Coronal HoleFeb 08 2012Apr 30 2012We have measured the widths of spectral lines from a polar coronal hole using the Extreme Ultraviolet Imaging Spectrometer onboard Hinode. Polar coronal holes are regions of open magnetic field and the source of the fast solar wind. We find that the line ... More
Quantum Physics and Signal Processing in Rigged Hilbert Spaces by means of Special Functions, Lie Algebras and Fourier and Fourier-like TransformsNov 11 2014Quantum Mechanics and Signal Processing in the line R, are strictly related to Fourier Transform and Weyl-Heisenberg algebra. We discuss here the addition of a new discrete variable that measures the degree of the Hermite functions and allows to obtain ... More
Asymptotic Energy Dependence of Hadronic Total Cross Sections from Lattice QCDMar 05 2012Sep 26 2012The nonperturbative approach to soft high-energy hadron-hadron scattering, based on the analytic continuation of Wilson-loop correlation functions from Euclidean to Minkowskian theory, allows to investigate the asymptotic energy dependence of hadron-hadron ... More