Results for "Francesca Greselin"

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Maximum likelihood estimation in constrained parameter spaces for mixtures of factor analyzersJan 08 2013Mixtures of factor analyzers are becoming more and more popular in the area of model based clustering of high-dimensional data. According to the likelihood approach in data modeling, it is well known that the unconstrained log-likelihood function may ... More
Measuring economic inequality and risk: a unifying approach based on personal gambles, societal preferences and referencesAug 01 2015The underlying idea behind the construction of indices of economic inequality is based on measuring deviations of various portions of low incomes from certain references or benchmarks, that could be point measures like population mean or median, or curves ... More
Inferential results for a new measure of inequalityJun 17 2017In this paper we derive inferential results for a new index of inequality, specifically defined for capturing significant changes observed both in the left and in the right tail of the income distributions. The latter shifts are an apparent fact for many ... More
A robust approach to model-based classification based on trimming and constraintsApr 12 2019In a standard classification framework a set of trustworthy learning data are employed to build a decision rule, with the final aim of classifying unlabelled units belonging to the test set. Therefore, unreliable labelled observations, namely outliers ... More
Modified Lorentz transformations in deformed special relativityAug 01 2016We extend a recent approach to Deformed Special Relativity based on deformed dispersion laws, entailing modified Lorentz transformations and, at the same time, noncommutative geometry and intrinsically discrete spacetime. In so doing we obtain the explicit ... More
Robust estimation for mixtures of Gaussian factor analyzers, based on trimming and constraintsMar 21 2015Mixtures of Gaussian factors are powerful tools for modeling an unobserved heterogeneous population, offering - at the same time - dimension reduction and model-based clustering. Unfortunately, the high prevalence of spurious solutions and the disturbing ... More
Robust estimation of mixtures of regressions with random covariates, via trimming and constraintsFeb 04 2015A robust estimator for a wide family of mixtures of linear regression is presented. Robustness is based on the joint adoption of the Cluster Weighted Model and of an estimator based on trimming and restrictions. The selected model provides the conditional ... More
Can three-neutron forces be constrained by empirical information on the neutron skin of 48Ca and 208Pb?Jun 12 2016We calculate the neutron matter equation of state from two-neutron forces up to fifth order of the chiral expansion and investigate the order-by-order convergence of the predictions. Based on these equations of state, we derive the binding energies and ... More
Supergravity models of Quintessence and Supersymmetry breakingDec 15 2000The issue of Supersymmetry breaking in the context of Supergravity models of Quintessence is discussed.
Sphere systems, standard form, and cores of products of treesOct 26 2016We introduce the concept of a standard form for two embedded maximal sphere systems in the doubled handlebody, and we prove an existence and uniqueness result. In particular, we show that pairs of maximal sphere systems in the doubled handlebody (up to ... More
Short-range correlations in isospin symmetric and asymmetric nuclear matter: a microscopic perspectiveSep 13 2014Dec 05 2014Short-range correlations in nuclear and neutron matter are examined through the properties of the correlated wave function obtained by solving the Bethe-Goldstone equation. Tensor correlations are explored through the dominant tensor-driven transition ... More
EUSO-TA fluorescence detectorJan 24 2017EUSO-TA is a pathfinder experiment for the space based JEM-EUSO mission for the detection of ultra-high energy cosmic rays. EUSO-TA is an high-resolution fluorescence telescope installed in front of the Black Rock Mesa fluorescence detectors of the Telescope ... More
On Squares in Lucas SequencesSep 02 2013In this short paper, we prove, by only using elementary tools, general cases when $U_n(P,Q) \neq \square$, where $U_n(P,Q)$ is the Lucas sequence of the first type.
Symmetries of quadratic forms classes and of quadratic surds continued fractions. Part II: Classification of the periods' palindromesAug 15 2007Mar 27 2008The continue fractions of quadratic surds are periodic, according to a theorem by Lagrange. Their periods may have differing types of symmetries. This work relates these types of symmetries to the symmetries of the classes of the corresponding indefinite ... More
Matricial formulae for partitionsJun 07 2008The exponential of the triangular matrix whose entries in the diagonal at distance $n$ from the principal diagonal are all equal to the sum of the inverse of the divisors of $n$ is the triangular matrix whose entries in the diagonal at distance $n$ from ... More
On the spectrum of the Laplace-Beltrami operator for $p$-forms for a class of warped product metricsNov 12 2003We explicitely compute the essential spectrum of the Laplace-Beltrami operator for $p$-forms for the class of warped product metrics $d\sigma^2= y^{2a}dy^2 + y^{2b}d\theta_{\partial M}^2$, where $y$ is a boundary defining function on a compact manifold ... More
Auslander-Reiten $(d+2)$-angles in subcategories and a $(d+2)$-angulated generalisation of a theorem by BrüningMar 19 2018Nov 15 2018Let $\Phi$ be a finite dimensional algebra over an algebraically closed field $k$ and assume gldim$\,\Phi\leq d$, for some fixed positive integer $d$. For $d=1$, Br\"uning proved that there is a bijection between the wide subcategories of the abelian ... More
Grothendieck groups of triangulated categoriesDec 20 2018Let $k$ be an algebraically closed field and $\mathcal{C}$ a $k$-linear, Hom-finite triangulated category with split idempotents. In this paper, we show that under suitable circumstances, the Grothendieck group of $\mathcal{C}$, denoted $K_0(\mathcal{C})$, ... More
Almost split morphisms in subcategories of triangulated categoriesOct 30 2017Sep 18 2018For a suitable triangulated category $\mathcal{T}$ with a Serre functor $S$ and a full precovering subcategory $\mathcal{C}$ closed under summands and extensions, an indecomposable object $C$ in $\mathcal{C}$ is called Ext-projective if Ext$^1(C,\mathcal{C})=0$. ... More
Stationary layered solutions for a system of Allen-Cahn type equationsNov 25 2012Dec 03 2012We consider a class of semilinear elliptic system of the form $-\Delta u(x,y)+\nabla W(u(x,y))=0,\quad (x,y)\in\R^{2}$ where $W:\R^{2}\to\R$ is a double well non negative symmetric potential. We show, via variational methods, that if the set of solutions ... More
Dark Energy and the Dark Matter relic abundanceSep 22 2004Two mechanisms by which the Quintessence scalar could enhance the relic abundance of dark matter particles are discussed. This effect can have an impact on supersymmetric candidates for dark matter.
Can the Inflaton and the Quintessence scalar be the same field?Feb 08 2000The most recent cosmological data point in the direction of a cosmological constant dominated universe. A suitable candidate for providing the required acceleration is a rolling scalar field named ``quintessence''. We address the issue of building a particle ... More
Some necessary and some sufficient conditions for the compactness of the embedding of weighted Sobolev spacesJan 30 2003We give some necessary conditions and sufficient conditions for the compactness of the embedding of Sobolev spaces $W^{1,p}(\Omega,w) \to L^p(\Omega,w),$ where $w$ is some weight on a domain $\Omega \subset \Real^n$.
Projective geometry from Poisson algebrasDec 08 2009Dec 09 2010In analogy with the Poisson algebra of the quadratic forms on the symplectic plane, and the notion of duality in the projective plane introduced by Arnold in \cite{Arn}, where the concurrence of the triangle altitudes is deduced from the Jacobi identity, ... More
Scattering theory for p-forms on hyperbolic real spaceJan 25 2001Due to spectral obstructions, a scattering theory in the Lax-Phillips sense for the wave equation for differential p-forms on H^{n+1} cannot be developed. As a consequence, Huygens' principle for the wave equation in this context does not hold. If we ... More
An application of scattering theory to the spectrum of the Laplace-Beltrami operatorJan 10 2003Applying a theorem due to Belopol'ski and Birman, we show that the Laplace-Beltrami operator on 1-forms on ${\bf R}^n$ endowed with an asymptotically Euclidean metric has absolutely continuous spectrum equal to $[0, +\infty)$.
An invariant of colored links via skein relationAug 28 2015Dec 02 2015In this note we define a polynomial invariant for colored links by a skein relation. It specializes to the Jones polynomial for classical links.
The range of all regularities for polynomial ideals with a given Hilbert functionJan 30 2019Given the Hilbert function $u$ of a closed subscheme of a projective space over an infinite field $K$, let $m_u$ and $M_u$ be, respectively, the minimum and the maximum among all the Castelnuovo-Mumford regularities of schemes with Hilbert function $u$. ... More
Supersymmetric QuintessenceJun 18 1999Recent data point in the direction of a cosmological constant dominated universe. We investigate the role of supersymmetric QCD with N_f < N_c as a possible candidate for dynamical cosmological constant (``quintessence''). We take in full consideration ... More
Lifetime measurements in $b$-hadron decays at LHCbNov 16 2014Precision lifetime measurements of $b$-flavoured hadrons are an important test of the validity of the theoretical tool used to determine $b$-hadrons observables, the Heavy Quark Expansion. Recent measurements of the $B^+$, $\Lambda^0_b$, $\Xi^-_b$, $\Xi^0_b$ ... More
Macroscopic limit of a bipartite Curie-Weiss model: a dynamical approachJun 16 2014Aug 25 2014We analyze the Glauber dynamics for a bi-populated Curie-Weiss model. We obtain the limiting behavior of the empirical averages in the limit of infinitely many particles. We then characterize the phase space of the model in absence of magnetic field and ... More
$\mathbf{\textit{CP}}$ Violation In The $\boldsymbol{B^0_{(s)}}$ System At LHCbMay 15 2014The study of $C\!P$ violation in decays of neutral $B$ mesons provides an important test of the Standard Model (SM) predictions and it is a sensitive probe to search for non-SM physics. In these proceedings I present measurements of $C\!P$ violation in ... More
Resolutions of ideals associated to subspace arrangementsOct 27 2018Mar 12 2019Given a collection of $t$ subspaces in an $n$-dimensional $\mathbb{K} $-vector space $W$ we can associate to them $t$ vanishing ideals in the symmetric algebra $\mathcal{S}(W^*) = \mathbb{K}[x_1,x_2,\dots,x_n]$. As a subspace is defined by a set of linear ... More
Quadratic Chabauty for (bi)elliptic curves and Kim's conjectureApr 09 2019We explore a number of problems related to the quadratic Chabauty method for determining integral points on hyperbolic curves. We remove the assumption of semistability in the description of the quadratic Chabauty sets $\mathcal{X}(\mathbb{Z}_p)_2$ containing ... More
Cesaro averages of Euler-like functionsJun 08 2008By Euler-like function we mean a function defined on the positive integers and associating to $n$ the product, over all primes $p$ dividing $n$, of 1 plus (or minus) the inverse of $p$ to the power $s$. We calculate the limit of the Cesaro mean of these ... More
Gysin exact sequences for quantum weighted lens spacesOct 04 2016We describe quantum weighted lens spaces as total spaces of quantum principal circle bundles, using a Cuntz-Pimsner model. The corresponding Pimsner exact sequence is interpreted as a noncommutative analogue of the Gysin exact sequence. We use the sequence ... More
Theta functions on the moduli space of parabolic bundlesFeb 18 2003Let X be a smooth projective connected curve of genus $g \ge 2$ and let I be a finite set of points of X. Fix a parabolic structure on I for rank r vector bundles on X. Let $M^{par}$ denote the moduli space of parabolic semistable bundles and let $L^{par}$ ... More
General covariant transition amplitudes in quantum cosmologyOct 13 2011The path-integral approach to cosmology consists in the computation of transition amplitudes between states of the quantum geometry of the universe. In the past, the concrete computation of these transitions amplitudes has been performed in a perturbative ... More
Spinfoam Cosmology: quantum cosmology from the full theoryNov 21 2010Quantum cosmology is usually studied quantizing symmetry-reduced variables. Is it possible, instead, to define quantum cosmology starting from the full quantum gravity theory? In Loop Quantum Gravity (LQG), it is possible to cut the degrees of freedom ... More
Quintessence, Supersymmetry and InflationAug 31 1999Recent data point in the direction of a $\Lambda$ dominated universe. We briefly review ``Quintessence'' as a model for a dynamical cosmological term and analyse the role of Susy QCD as a possible particle physics candidate. The multiscalar content of ... More
Continued fractions in function fields: polynomial analogues of McMullen's and Zaremba's conjecturesApr 09 2017Jun 07 2017We examine the polynomial analogues of McMullen's and Zaremba's conjectures on continued fractions with bounded partial quotients. It has already been proved by Blackburn that if the base field is infinite, then the polynomial analogue of Zaremba's conjecture ... More
Microscopic approach to the nucleon-nucleon effective interaction and nucleon-nucleon scattering in symmetric and isospin-asymmetric nuclear matterJul 20 2013After reviewing our microscopic approach to nuclear and neutron-rich matter, we focus on how nucleon-nucleon scattering is impacted by the presence of a dense hadronic medium, with special emphasis on the case where neutron and proton densities are different. ... More
Outer Regions of the Milky WayJan 03 2017With the start of the Gaia era, the time has come to address the major challenge of deriving the star formation history and evolution of the disk of our MilkyWay. Here we review our present knowledge of the outer regions of the Milky Way disk population. ... More
On the topology of surfaces with the generalised simple lift propertyDec 14 2016In this paper, we study the geometry of surfaces with the generalised simple lift property. This work generalises previous results by Bernstein and Tinaglia, and it is motivated by the fact that leaves of a minimal lamination obtained as a limit of a ... More
Consequences of the functional equation of the $p$-adic $L$-function of an elliptic curveNov 09 2016We prove that the first two coefficients in the series expansion around $s=1$ of the $p$-adic $L$-function of an elliptic curve over $\mathbb{Q}$ are related by a formula involving the conductor of the curve. This is analogous to a recent result of Wuthrich ... More
Proton skins, neutron skins, and proton radii of mirror nucleiDec 17 2017We present predictions for proton skins based on isospin-asymmetric equations of state derived microscopically from high-precision chiral few-nucleon interactions. Moreover, we investigate the relation between the neutron skin of a nucleus and the difference ... More
Infinities as a measure of our ignoranceMay 10 2013The quantization of gravity offers a solution to the presence of singularities in cosmology. Infinities are removed because of the existence of finite quanta of spacetime. This is one of the most important prediction of Loop Quantum Gravity. But treating ... More
Performance of the ALICE Time-Of-Flight detector at the LHCJun 11 2018The ALICE Time-Of-Flight (TOF) detector at LHC is based on the Multigap Resistive Plate Chambers (MRPCs). The TOF performance during LHC Run 2 is here reported. Particular attention is given to the improved time resolution reached by TOF detector of $56$ ... More
Many-nodes/many-links spinfoam: the homogeneous and isotropic caseJul 13 2011Oct 13 2011I compute the Lorentzian EPRL/FK/KKL spinfoam vertex amplitude for regular graphs, with an arbitrary number of links and nodes, and coherent states peaked on a homogeneous and isotropic geometry. This form of the amplitude can be applied for example to ... More
Quintessence and the dark matter abundanceSep 11 2003Results of a recent study on how the Quintessence scalar could affect the relic abundance of dark matter particles are presented.
A result on the analytic $μ$-invariant of elliptic curvesApr 03 2017We generalise a result by Greenberg and Vatsal on the relation between the analytic $\mu$-invariants of two elliptic curves whose $p^i$-torsion subgroups are isomorphic as Galois modules, for suitable $i$.
Investigation of constraints on few-neutron forces in neutron matter by empirical information on the neutron skin of 48Ca and 208PbJun 12 2016Nov 06 2016The neutron matter equation of state is calculated from two-neutron forces up to fifth order of the chiral expansion and the order-by-order convergence of the predictions is investigated. Based on these equations of state, the binding energies and the ... More
Separation of branches of O(N-1)-invariant solutions for a semilinear elliptic equationFeb 17 2016We consider a semilinear elliptic problem in an annulus of R^N, with N>1. Recent results ensure that there exists a sequence p_k of exponents of the nonlinear term at which a nonradial bifurcation from the radial solution occurs. Exploiting the properties ... More
Introduction to Galactic Chemical EvolutionFeb 02 2016In this lecture I will introduce the concept of galactic chemical evolution, namely the study of how and where the chemical elements formed and how they were distributed in the stars and gas in galaxies. The main ingredients to build models of galactic ... More
Measuring the last burst of non-singular black holesMar 07 2018Non-perturbative quantum gravity prevents the formation of curvature singularities and may allow black holes to decay with a lifetime shorter than evaporation time. This, in connection with the existence of primordial black holes, could open a new window ... More
Short-range correlations in the deuteron: chiral effective field theory, meson-exchange, and phenomenologyJul 24 2015We study high-momentum distributions and short-range correlation probabilities in the deuteron with a variety of modern potentials based on chiral effective field theory up to fifth order in the chiral expansion. We also consider some conventional (meson-exchange ... More
A pilot study on the daily control capability of s-EMG prosthetic hands by amputeesNov 18 2015Nov 24 2015Surface electromyography is a valid tool to gather muscular contraction signals from intact and amputated subjects. Electromyographic signals can be used to control prosthetic devices in a noninvasive way distinguishing the movements performed by the ... More
Relational Quantum CosmologyAug 22 2015The application of quantum theory to cosmology raises a number of conceptual questions, such as the role of the quantum-mechanical notion of "observer" or the absence of a time variable in the Wheeler-DeWitt equation. I point out that a relational formulation ... More
Symmetries of quadratic forms classes and of quadratic surds continued fractions. Part I: A Poincaré model for the de Sitter worldAug 11 2007Mar 27 2008The problem of the classification of the indefinite binary quadratic forms with integer coefficients is solved introducing a special partition of the de Sitter world, where the coefficients of the forms lie, into separate domains. Every class of indefinite ... More
A monotonicity result under symmetry and Morse index constraints in the planeApr 08 2019This paper deals with solutions of semilinear elliptic equations of the type \[ \left\{\begin{array}{ll} -\Delta u = f(|x|, u) \qquad & \text{ in } \Omega, \\ u= 0 & \text{ on } \partial \Omega, \end{array} \right. \] where $\Omega$ is a radially symmetric ... More
Bell-shaped nonstationary refinable rippletsJan 15 2015We study the approximation properties of the class of nonstationary refinable ripplets introduced in \cite{GP08}. These functions are solution of an infinite set of nonstationary refinable equations and are defined through sequences of scaling masks that ... More
Intrinsic Regular Surfaces of low co-dimension in Heisenberg groupsMar 11 2019In this paper we study intrinsic regular submanifolds of $\mathbb{H}^n$, of low co-dimension in relation with the regularity of their intrinsic parametrization. We extend some results proved for one co-dimensional $\mathbb{H}$-regular surfaces, characterizing ... More
On the spectrum of the Laplace-Beltrami operator for p-forms on asymptotically hyperbolic manifoldsNov 07 2003Under suitable conditions on the asymptotic decay of the metric, we compute the essential spectrum of the Laplace-Beltrami operator acting on $p$-forms on asymptotically hyperbolic manifolds.
A $p$-Laplacian Neumann problem with a possibly supercritical nonlinearityOct 15 2016We look for nonconstant, positive, radially nondecreasing solutions of the quasilinear equation $-\Delta_p u+u^{p-1}=f(u)$ with $p>2$, in the unit ball $B$ of $\mathbb R^N$, subject to homogeneous Neumann boundary conditions. The assumptions on the nonlinearity ... More
Rational tangles and the modular groupAug 15 2009There is a natural way to associate with a transformation of an isotopy class of rational tangles to another, an element of the modular group. The correspondence between the isotopy classes of rational tangles and rational numbers follows, as well as ... More
New invariants of links from a skein invariant of colored linksDec 02 2015Dec 10 2015New invariants of links are constructed using the skein invariant polynomial of colored links defined by the author in [1]. These invariants are stronger than the homflypt polynomial.
$d$-Auslander-Reiten sequences in subcategoriesAug 08 2018Let $\Phi$ be a finite dimensional algebra over an algebraically closed field. Kleiner described the Auslander-Reiten sequences in a precovering extension closed subcategory $\mathcal{X}\subseteq\text{mod }\Phi$. If $X\in\mathcal{X}$ is an indecomposable ... More
A note on the Guerra and Talagrand theorems for Mean Field Spin Glasses: the simple case of spherical modelsApr 01 2005Jul 20 2005The aim of this paper is to discuss the main ideas of the Talagrand proof of the Parisi Ansatz for the free-energy of Mean Field Spin Glasses with a physicist's approach. We consider the case of the spherical $p$-spin model, which has the following advantages: ... More
Unabsorbed Seyfert 2 galaxiesAug 28 2002We present a sample of 17 type 2 Seyfert galaxies which have an X-ray column density lower than 10^{22} cm^{-2}. The Compton thin nature of these sources is strongly suggested by isotropic indicators. We estimate the fraction of these sources to be in ... More
Stepping out of Homogeneity in Loop Quantum CosmologyMay 29 2008We explore the extension of quantum cosmology outside the homogeneous approximation, using the formalism of loop quantum gravity. We introduce a model where some of the inhomogeneous degrees of freedom are present, providing a tool for describing general ... More
Low-Scale See-Saw Mechanisms for Light NeutrinosJul 03 2000Jun 27 2001Alternatives to the see-saw mechanism are explored in supersymmetric models with three right-handed or sterile neutrinos. Tree-level Yukawa couplings can be drastically suppressed in a natural way to give sub-eV Dirac neutrino masses. If, in addition, ... More
Perturbations in Quintessential InflationNov 24 1998Recently Peebles and Vilenkin proposed and quantitatively analyzed the fascinating idea that a substantial fraction of the present cosmic energy density could reside in the vacuum potential energy of the scalar field responsible for inflation (quintessential ... More
Interpretation of abundance ratiosSep 24 2004In this paper we discuss abundance ratios and their relation to stellar nucleosynthesis and other parameters of chemical evolution models, reviewing and clarifying the correct use of the observed abundance ratios in several astrophysical contests. In ... More
On the fundamental group of an abelian coverMay 20 1993We study the behaviour of the topological fundamental group under totally ramified abelian covers (a special case of abelian Galois covers) of complex projective varieties of dimension at least 2.
Large spin expansion of the long-range Baxter equation in the sl(2) sector of N=4 SYMOct 10 2007Jan 24 2008Recently, several multi-loop conjectures have been proposed for the spin dependence of anomalous dimensions of twist-2 and 3 operators in the sl(2) sector of N=4 SYM. Currently, these conjectures are not proven, although several consistency checks have ... More
A characterization related to Schrödinger equations on Riemannian manifoldsApr 07 2017In this paper we consider the following problem $$\begin{cases} -\Delta_{g}u+V(x)u=\lambda\alpha(x)f(u), & \mbox{in }M\\ u\geq0, & \mbox{in }M\\ u\to0, & \mbox{as }d_{g}(x_{0},x)\to\infty \end{cases}$$where $(M,g)$ is a $N$-dimensional ($N\geq3)$, non-compact ... More
A geometrical analysis of global stability in trained feedback networksSep 07 2018Jan 18 2019Recurrent neural networks have been extensively studied in the context of neuroscience and machine learning due to their ability to implement complex computations. While substantial progress in designing effective learning algorithms has been achieved ... More
Intrinsically-generated fluctuating activity in excitatory-inhibitory networksMay 13 2016May 09 2017Recurrent networks of non-linear units display a variety of dynamical regimes depending on the structure of their synaptic connectivity. A particularly remarkable phenomenon is the appearance of strongly fluctuating, chaotic activity in networks of deterministic, ... More
Pre-big-bang black-hole remnants and the past low entropyMay 08 2018Nov 09 2018Dark matter could be composed by black-hole remnants formed before the big-bang era in a bouncing cosmology. This hypothetical scenario has major implications on the issue of the arrow of time: it would upset a common attribution of past low entropy to ... More
Multi-Dimensional, Multilayer, Nonlinear and Dynamic HITSSep 21 2018We introduce a ranking model for temporal multi-dimensional weighted and directed networks based on the Perron eigenvector of a multi-homogeneous order-preserving map. The model extends to the temporal multilayer setting the HITS algorithm and defines ... More
A global assessment of tourism and recreation conservation threats to prioritise interventionsAug 25 2018We are increasingly using nature for tourism and recreation, an economic sector now generating more than 10% of the global GDP and 10% of global total employment. This growth though has come at a cost and we now have 5930 species for which tourism and ... More
Small black/white hole stability and dark matterMay 10 2018Nov 09 2018We show that the expected lifetime of white holes formed as remnants of evaporated black holes is consistent with their production at reheating. We give a simple quantum description of these objects and argue that a quantum superposition of black and ... More
The radius of a typical-mass neutron star and chiral effective field theoryMar 04 2018Jul 22 2018We calculate neutron star masses and radii from equations of state based on recent high-quality chiral nucleon-nucleon potentials up to fifth order of the chiral expansion and the leading chiral three- nucleon force. Our focus is on the radius of a 1.4 ... More
Learning Onto-Relational Rules with Inductive Logic ProgrammingOct 10 2012Oct 29 2012Rules complement and extend ontologies on the Semantic Web. We refer to these rules as onto-relational since they combine DL-based ontology languages and Knowledge Representation formalisms supporting the relational data model within the tradition of ... More
Dynamical moderate deviations for the Curie-Weiss modelJul 18 2016Jan 13 2017We derive moderate deviation principles for the trajectory of the empirical magnetization of the standard Curie-Weiss model via a general analytic approach based on convergence of generators and uniqueness of viscosity solutions for associated Hamilton-Jacobi ... More
A p-Laplacian supercritical Neumann problemJun 21 2016For $p>2$, we consider the quasilinear equation $-\Delta_p u+|u|^{p-2}u=g(u)$ in the unit ball $B$ of $\mathbb R^N$, with homogeneous Neumann boundary conditions. The assumptions on $g$ are very mild and allow the nonlinearity to be possibly supercritical ... More
Consensus versus persistence of disagreement in opinion formation: the role of zealotsMar 08 2016We consider a general class of three--state models where individuals hold one of two opposite opinions, or are neutral, and exchange opinions in generic pairwise interactions. We show that when opinions spread in a population where a fraction of individuals ... More
Robust Financial BubblesFeb 17 2016We study the concept of financial bubble in a market model endowed with a set of probability measures, typically mutually singular to each other. In this setting we introduce the notions of robust bubble and robust fundamental value in a consistent way ... More
Interplay between media and social influence in the collective behavior of opinion dynamicsNov 03 2015Messages conveyed by media act as a major drive in shaping attitudes and inducing opinion shift. On the other hand, individuals are strongly affected by peer pressure while forming their own judgment. We solve a general model of opinion dynamics where ... More
Approximate controllability via adiabatic techniques for the three-inputs controlled Schr{ö}dinger equationFeb 24 2015We consider a system described by a controlled bilinear Schr{\"o}dinger equation with three external inputs. We provide a constructive method to approximately steer the system from a given energy level to a superposition of energy levels corresponding ... More
Updating and downdating techniques for optimizing network communicabilityOct 20 2014Aug 20 2015The total communicability of a network (or graph) is defined as the sum of the entries in the exponential of the adjacency matrix of the network, possibly normalized by the number of nodes. This quantity offers a good measure of how easily information ... More
Significant Enhancement of Neutralino Dark Matter Annihilation from Electroweak BremsstrahlungAug 05 2013Feb 19 2014Indirect searches for the cosmological dark matter have become ever more competitive during the past years. Here, we report the first full calculation of leading electroweak corrections to the annihilation rate of supersymmetric neutralino dark matter. ... More
The taxonomic distribution of asteroids from multi-filter all-sky photometric surveysJul 09 2013The distribution of asteroids across the Main Belt has been studied for decades to understand the compositional distribution and what that tells us about the formation and evolution of our solar system. All-sky surveys now provide orders of magnitude ... More
Optimal multi-binding unification for sharing and linearity analysisJun 10 2013In the analysis of logic programs, abstract domains for detecting sharing properties are widely used. Recently the new domain $\Linp$ has been introduced to generalize both sharing and linearity information. This domain is endowed with an optimal abstract ... More
On the implementation of a finite volumes scheme with monotone transmission conditions for scalar conservation laws on a star-shaped networkFeb 06 2019In this paper we validate the implementation of the numerical scheme proposed in [3]. The validation is made by comparison with an explicit solution here obtained, and the solutions of Riemann problems for several networks. We then perform some simulations ... More
The metallicity distribution of the stars in elliptical galaxiesOct 27 2006Elliptical galaxies probably host the most metal rich stellar populations in the Universe. The processes leading to both the formation and the evolution of such stars are discussed by means of a new multi-zone photo-chemical evolution model, taking into ... More
The effects of population III stars on the chemical and photometrical evolution of ellipticalsNov 26 2004We have studied the effects of an hypothetical initial generation containing very massive stars (M > 100 Msun, pair-creation SNe) on the chemical and photometric evolution of elliptical galaxies. To this purpose, we have computed the evolution of a typical ... More
Symmetry and rigidity for the hinged composite plate problemMay 25 2018Oct 09 2018The composite plate problem is an eigenvalue optimization problem related to the fourth order operator $(-\Delta)^2$. In this paper we continue the study started in [10], focusing on symmetry and rigidity issues in the case of the hinged composite plate ... More
Quantitative information flow under generic leakage functions and adaptive adversariesJul 21 2015Nov 09 2015We put forward a model of action-based randomization mechanisms to analyse quantitative information flow (QIF) under generic leakage functions, and under possibly adaptive adversaries. This model subsumes many of the QIF models proposed so far. Our main ... More
Infinitely many cyclic solutions to the Hamilton-Waterloo problem with odd length cyclesJan 28 2015Mar 31 2016It is conjectured that for every pair $(\ell,m)$ of odd integers greater than 2 with $m \equiv 1\; \pmod{\ell}$, there exists a cyclic two-factorization of $K_{\ell m}$ having exactly $(m-1)/2$ factors of type $\ell^m$ and all the others of type $m^{\ell}$. ... More