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Results for "Gianpaolo Di Pietro"

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Towards Affordance Prediction with Vision via Task Oriented Grasp Quality MetricsJul 10 2019While many quality metrics exist to evaluate the quality of a grasp by itself, no clear quantification of the quality of a grasp relatively to the task the grasp is used for has been defined yet. In this paper we propose a framework to extend the concept ... More
Scale factor duality in quintessence models ?May 16 2001We consider several kinds of quintessence models in the framework of scale factor duality. We show that this symmetry exists only for a very small number of quintessence potentials. We then apply the duality transformations found to several analytical ... More
Operator mixing in $\boldsymbolε$-expansion: scheme and evanescent (in)dependenceAug 12 2017We consider theories with fermionic degrees of freedom that have a fixed point of Wilson-Fisher type in non-integer dimension $d = 4-2\epsilon$. Due to the presence of evanescent operators, i.e., operators that vanish in integer dimensions, these theories ... More
A constant equation of state for quintessence ?Aug 27 1999Sep 05 2000Quintessence is often invoked to explain the universe acceleration suggested by the type Ia supernovae observations. The aim of this letter is to study the validity of using a constant equation of state for quintessence models. We shall show that this ... More
A Spark is Enough in a Straw World: a Study of Websites Password Management in the WildApr 19 2018Apr 24 2018The widespread usage of password authentication in online websites leads to an ever-increasing concern, especially when considering the possibility for an attacker to recover the user password by leveraging the loopholes in the password recovery mechanisms. ... More
$W^{s,p}$-approximation properties of elliptic projectors on polynomial spaces, with application to the error analysis of a Hybrid High-Order discretisation of Leray-Lions problemsJun 09 2016Jan 30 2017In this work we prove optimal $W^{s,p}$-approximation estimates (with $p\in[1,+\infty]$) for elliptic projectors on local polynomial spaces. The proof hinges on the classical Dupont--Scott approximation theory together with two novel abstract lemmas: ... More
The anisotropic $\infty$-Laplacian eigenvalue problem with Neumann boundary conditionsJul 02 2017We analize the limit problem of the anisotropic $p$-Laplacian as $p\rightarrow\infty$ with the mean of the viscosity solution. We also prove some geometric properties of eigenvalues and eigenfunctions. In particular, we show the validity of a Szeg\"o-Weinberger ... More
't Hooft anomalies and the holomorphy of supersymmetric partition functionsMay 14 2019We study the dependence of supersymmetric partition functions on continuous parameters for the flavor symmetry group, $G_F$, for 2d $\mathcal{N} = (0,2)$ and 4d $\mathcal{N}=1$ supersymmetric quantum field theories. In any diffeomorphism-invariant scheme ... More
A third Strang lemma and an Aubin-Nitsche trick for schemes in fully discrete formulationApr 25 2018Nov 13 2018In this work, we present an abstract error analysis framework for the approximation of linear partial differential equation (PDE) problems in weak formulation. We consider approximation methods in fully discrete formulation, where the discrete and continuous ... More
Flaw effects on square and kagome artificial spin iceOct 18 2016In this work, we study the effect of nanoislands with design flaws on the bilayer-square and in kagome arrays of artificial spin ice. We have introduced disorder as random fluctuations in the length of the magnetic islands using two kinds of distributions: ... More
A Hybrid High-Order method for the steady incompressible Navier--Stokes problemJul 27 2016In this work we introduce and analyze a novel Hybrid High-Order method for the steady incompressible Navier-Stokes equations. The proposed method is inf-sup stable on general polyhedral meshes, supports arbitrary approximation orders, and is (relatively) ... More
A Hybrid High-Order method for Leray-Lions elliptic equations on general meshesAug 08 2015Dec 07 2016In this work, we develop and analyze a Hybrid High-Order (HHO) method for steady non-linear Leray-Lions problems. The proposed method has several assets, including the support for arbitrary approximation orders and general polytopal meshes. This is achieved ... More
A Hybrid High-Order method for the incompressible Navier--Stokes equations based on Temam's deviceJul 19 2018Oct 10 2018In this work we propose a novel Hybrid High-Order method for the incompressible Navier--Stokes equations based on a formulation of the convective term including Temam's device for stability. The proposed method has several advantageous features: it supports ... More
The evolution of the V-K colours of single stellar populationsJan 15 1998Feb 25 1998We discuss how the integrated V-K colours of single stellar populations evolve with age and metallicity. Some of the uncertainties associated to the properties of the underlying stellar models are throughfully discussed. First, we present the effects ... More
Hölder regularity for non divergence form elliptic equations with discontinuous coefficientsOct 18 2012In this note we study the global regularity in the Morrey spaces for the second derivatives for the strong solutions of non variational elliptic equations.
A nonconforming high-order method for the Biot problem on general meshesJun 11 2015Feb 24 2016In this work, we introduce a novel algorithm for the Biot problem based on a Hybrid High-Order discretization of the mechanics and a Symmetric Weighted Interior Penalty discretization of the flow. The method has several assets, including, in particular, ... More
Stress-testing memcomputing on hard combinatorial optimization problemsJun 30 2018Memcomputing is a novel paradigm of computation that utilizes dynamical elements with memory to both store and process information on the same physical location. Its building blocks can be fabricated in hardware with standard electronic circuits, thus ... More
A Hybrid High-Order method for Kirchhoff-Love plate bending problemsJun 21 2017Jan 24 2018We present a novel Hybrid High-Order (HHO) discretization of fourth-order elliptic problems arising from the mechanical modeling of the bending behavior of Kirchhoff-Love plates, including the biharmonic equation as a particular case. The proposed HHO ... More
Resilient Design of 5G Mobile-Edge Computing Over Intermittent mmWave LinksJan 07 2019Mar 28 2019Two enablers of the 5th Generation (5G) of mobile communication systems are the high data rates achievable with millimeter-wave radio signals and the cloudification of the network's mobile edge, made possible also by Multi-access Edge Computing (MEC). ... More
A high-order discretization of nonlinear poroelasticityJun 03 2019In this work we construct and analyze a nonconforming high-order discretization method for the quasi-static single-phase nonlinear poroelasticity problem describing Darcean flow in a deformable porous medium saturated by a slightly compressible fluid. ... More
Foundations, Properties, and Security Applications of Puzzles: A SurveyApr 23 2019Cryptographic algorithms have been used not only to create robust ciphertexts, but also to generate cryptograms that, contrary to the classic goal of cryptography, are meant to be broken. These cryptograms, generally called puzzles, required the use of ... More
BAD: Blockchain Anomaly DetectionJul 10 2018Jul 12 2018Anomaly detection tools play a role of paramount importance in protecting networks and systems from unforeseen attacks, usually by automatically recognizing and filtering out anomalous activities. Over the years, different approaches have been designed, ... More
A Hybrid High-Order method for the Cahn-Hilliard problem in mixed formSep 24 2015Apr 08 2016In this work, we develop a fully implicit Hybrid High-Order algorithm for the Cahn-Hilliard problem in mixed form. The space discretization hinges on local reconstruction operators from hybrid polynomial unknowns at elements and faces. The proposed method ... More
A saturation phenomenon for a nonlinear nonlocal eigenvalue problemMar 21 2016Given $1\le q \le 2$ and $\alpha\in\mathbb R$, we study the properties of the solutions of the minimum problem \[ \lambda(\alpha,q)=\min\left\{\dfrac{\displaystyle\int_{-1}^{1}|u'|^{2}dx+\alpha\left|\int_{-1}^{1}|u|^{q-1}u\, dx\right|^{\frac2q}}{\displaystyle\int_{-1}^{1}|u|^{2}dx}, ... More
Fame for sale: efficient detection of fake Twitter followersSep 14 2015Nov 10 2015$\textit{Fake followers}$ are those Twitter accounts specifically created to inflate the number of followers of a target account. Fake followers are dangerous for the social platform and beyond, since they may alter concepts like popularity and influence ... More
LES of the Sandia Flame D Using an FPV Combustion ModelFeb 01 2016The simulation of turbulent combustion phenomena is still an open problem in modern fluid dynamics. Considering the economical importance of hydrocarbon combustion in energy production processes, it is evident the need of an accurate tool with a relatively ... More
Spectral weight redistribution in (LaNiO3)n/(LaMnO3)2 superlattices from optical spectroscopyMar 25 2015We have studied the optical properties of four (LaNiO$_3$)$_n$/(LaMnO$_3$)$_2$ superlattices (SL) ($n$=2, 3, 4, 5) on SrTiO$_3$ substrates. We have measured the reflectivity at temperatures from 20 K to 400 K, and extracted the optical conductivity through ... More
Simulated Epidemics in 3D Protein Structures to Detect Functional PropertiesJun 12 2019The outcome of an epidemic is closely related to the network of interactions between the individuals. Likewise, protein functions depend on the 3D arrangement of their residues and on the underlying energetic interaction network. Borrowing ideas from ... More
Numerical approximation of poroelasticity with random coefficients using Polynomial Chaos and Hybrid High-Order methodsMar 28 2019In this work, we consider the Biot problem with uncertain poroelastic coefficients. The uncertainty is modelled using a finite set of parameters with prescribed probability distribution. We present the variational formulation of the stochastic partial ... More
On the Recognition of Fuzzy Circular Interval GraphsApr 12 2011Fuzzy circular interval graphs are a generalization of proper circular arc graphs and have been recently introduced by Chudnovsky and Seymour as a fundamental subclass of claw-free graphs. In this paper, we provide a polynomial-time algorithm for recognizing ... More
A fast algorithm to remove proper and homogenous pairs of cliques (while preserving some graph invariants)Mar 14 2011We introduce a family of reductions for removing proper and homogeneous pairs of cliques from a graph G. This family generalizes some routines presented in the literature, mostly in the context of claw-free graphs. These reductions can be embedded in ... More
The Star Formation History of the Local Group dwarf galaxy Leo IJun 07 1999We present a quantitative analysis of the star formation history (SFH) of the Local Group dSph galaxy Leo I, from the information in its HST [(V-I),I] color-magnitude diagram (CMD). The method we use is based in comparing, via synthetic CMDs, the expected ... More
The Virtual Private Network Design Problem with Concave Costs (Oberwolfach abstract)Dec 12 2008The symmetric Virtual Private Network Design (VPND) problem is concerned with buying capacity on links (edges) in a communication network such that certain traffic demands can be met. We investigate a natural generalization of VPND where the cost per ... More
A Short Proof of the VPN Tree Routing Conjecture on Ring NetworksOct 16 2007Oct 26 2007The VPN Tree Routing Conjecture states that there always exists an optimal solution to the symmetric Virtual Private Network Design (sVPND) problem where the paths between all terminals form a tree. Only recently, Hurkens, Keijsper, and Stougie gave a ... More
Constraints on R-Parity violating stop couplings from flavor physicsAug 25 2000Nov 22 2000We perform a critical reassessment of the constraints on the R-parity and baryon number violating (s)top couplings coming from flavor physics. In particular, we study K0-K0bar mixing, including QCD corrections and a class of diagrams that were neglected ... More
Spectrally Perron Polynomials and the Cauchy-Ostrovsky TheoremAug 26 2016Oct 23 2016In this note, proofs of theorems attributed to Cauchy and Ostrovsky via combinatorial matrix theory and nonnegative matrix theory are given. We show that the sufficient conditions in each theorem are also necessary. In addition, we introduce the notion ... More
Supersymmetry and First Order Equations for Extremal States: Monopoles, Hyperinstantons, Black-Holes and p-BranesJan 13 1997Jan 16 1997In this lecture I review recent results on the first order equations describing BPS extremal states, in particular N=2 extremal black-holes. The role of special geometry is emphasized also in the rigid theory and a comparison is drawn with the supersymmetric ... More
Representations of Atiyah algebroids and logarithmic connectionsMay 18 2015In this paper, we investigate representations of $\operatorname{At}(N)$, the Atiyah algebroids of a holomorphic line bundles $N$ over a complex manifold $Y$. In particular, we relate $\operatorname{At}(N)$-modules with logarithmic connections through ... More
Indirect constraints on R-parity violating stop couplingsMar 31 2000Aug 04 2000It was recently claimed that single stop production at the Tevatron, occurring via R-parity (and baryon number) violating couplings, could lead to observable signals. In this talk I present some results of a work in progress, showing that rare B decays ... More
A differential extension of Descartes' foundational approach: a new balance between symbolic and analog computationApr 04 2019In La G\'eom\'etrie, Descartes proposed a balance between geometric constructions and symbolic manipulation with the introduction of suitable ideal machines. In modern terms, that is a balance between analog and symbolic computation. Descartes' geometric ... More
On a dyadic approximation of predictable processes of finite variationJun 26 2013Mar 27 2014We show that any cadlag predictable process of finite variation is an a.s. limit of elementary predictable processes; it follows that predictable stopping times can be approximated `from below' by predictable stopping times which take finitely many values. ... More
Do arbitrage-free prices come from utility maximization?Jul 19 2012Oct 22 2013In this paper we ask whether, given a stock market and an illiquid derivative, there exists arbitrage-free prices at which an utility-maximizing agent would always want to buy the derivative, irrespectively of his own initial endowment of derivatives ... More
Combinatorial interpretations of particular evaluations of complete and elementary symmetric functionsNov 11 2011The Jacobi-Stirling numbers and the Legendre-Stirling numbers of the first and second kind were first introduced in [6], [7]. In this paper we note that Jacobi-Stirling numbers and Legendre-Stirling numbers are specializations of elementary and complete ... More
Periodic solutions of forced Kirchhoff equationsJan 14 2007Jun 14 2007We consider Kirchhoff equations for vibrating bodies in any dimension in presence of a time-periodic external forcing with period 2pi/omega and amplitude epsilon, both for Dirichlet and for space-periodic boundary conditions. We prove existence, regularity ... More
An explicit bound for the log-canonical degree of curves on open surfacesJan 08 2019Let $X$, $D$ be a smooth projective surface and a simple normal crossing divisor on $X$, respectively. Suppose $\kappa (X, K_X + D)\ge 0$, let $C$ be an irreducible curve on $X$ whose support is not contained in $D$ and $\alpha$ a rational number in $ ... More
Interband characterization and electronic transport control of nanoscaled GeTe/Sb$_2$Te$_3$ superlatticesMay 28 2016The extraordinary electronic and optical properties of the crystal-to-amorphous transition in phase-change materials led to important developments in memory applications. A promising outlook is offered by nanoscaling such phase-change structures. Following ... More
Electrodynamics of superconducting pnictide superlatticesApr 16 2014It has been recently reported (S. Lee et al., Nature Materials 12, 392, 2013) that superlattices where layers of the 8% Co-doped BaFe2As2 superconducting pnictide are intercalated with non superconducting ultrathin layers of either SrTiO3 or of oxygen-rich ... More
Optical conductivity of Bismuth-based topological insulatorJan 26 2012Sep 12 2012The optical conductivity and the spectral weight of four topological insulators with increasing chemical compensation (Bi2Se3, Bi2-xCaxSe3, Bi2Se2Te, Bi2Te2Se) have been measured from 5 to 300 K and from sub-THz to visible frequencies. The effect of compensation ... More
Topological Classification of Holomorphic, Semi-Hyperbolic Germs, in "Quasi-Absence" of ResonancesJan 23 2005The classification, by topological conjugacy, of invertible holomorphic germs $f:(\mathbb{C}^n,0)\to (\mathbb{C}^n,0)$, with $\lambda_1,...,\lambda_n$ eigenvalues of $df_0$, and $|\lambda_i|\neq 1$ for $i=2,...,n$ while $\lambda_1$ is a root of the unity, ... More
On some detailed examples of quantum like structures containing quantum potential states in the sphere of biological dynamicsAug 24 2006In the first part of the present paper we give an analysis of the ontic nature of quantum states to be intended as potentialities and of the central role of spin to be considered as the basic essence of quantum mechanical reality: using an algebraic quantum ... More
On integral points on surfacesJun 10 2002We study integral points on affine surfaces by means of a new method, relying on the Subspace Theorem. Under suitable assumptions on the divisor at infinity, we prove that the integral points are contained in a curve. As a corollary, we prove that there ... More
Size of data in implicit function problems and singular perturbations for nonlinear Schrödinger systemsJun 28 2019We investigate a general question about the size and regularity of the data and the solutions in implicit function problems with loss of regularity. First, we give a heuristic explanation of the fact that the optimal data size found by Ekeland and S\'er\'e ... More
A Semianalytical Method to Evolve Parton DistributionsJul 31 1998May 25 1999We present a new method to solve in a semianalytical way the Dokshitzer-Gribov-Lipatov-Altarelli-Parisi evolution equations at NLO order in the x-space. The method allows to construct an evolution operator expressed in form of a rapidly convergent series ... More
Stacks of quantization-deformation modules on complex symplectic manifoldsMay 12 2003Aug 08 2003On a complex symplectic manifold, we construct the stack of quantization-deformation modules, that is, (twisted) modules of microdifferential operators with an extra central parameter, a substitute to the lack of homogeneity. We also quantize involutive ... More
Universal Minimal Flow in the Theory of Topological GroupoidsSep 19 2016In this paper we investigate some connections between Topological Dynamics, the theory of G-Principal Bundles, and the theory of Locally Trivial Groupoids.
Towards an optimal decision strategy of visual searchNov 05 2014Searching for objects amongst clutter is a key ability of visual systems. Speed and accuracy are often crucial: how can the visual system trade off these competing quantities for optimal performance in different tasks? How does the trade-off depend on ... More
A fast subsampling method for estimating the distribution of signal-to-noise ratio statistics in nonparametric time series regression modelsNov 06 2017Apr 17 2019Signal-to-noise ratio (SNR) statistics play a central role in many applications. A common situation where SNR is studied is when a continuous time signal is sampled at a fixed frequency with some noise in the background. While estimation methods exist, ... More
Modelling trait dependent speciation with Approximate Bayesian ComputationDec 10 2018Phylogeny is the field of modelling the temporal discrete dynamics of speciation. Complex models can nowadays be studied using the Approximate Bayesian Computation approach which avoids likelihood calculations. The field's progression is hampered by the ... More
Quasi-optimal nonconforming methods for symmetric elliptic problems. III -- DG and other interior penalty methodsOct 10 2017We devise new variants of the following nonconforming finite element methods: DG methods of fixed arbitrary order for the Poisson problem, the Crouzeix-Raviart interior penalty method for linear elasticity, and the quadratic $C^0$ interior penalty method ... More
Quasi-optimal nonconforming methods for symmetric elliptic problems. II -- Overconsistency and classical nonconforming elementsOct 10 2017We devise variants of classical nonconforming methods for symmetric elliptic problems. These variants differ from the original ones only by transforming discrete test functions into conforming functions before applying the load functional. We derive and ... More
Moduli spaces of $Λ$-modules on abelian varietiesFeb 19 2016Sep 04 2017We study the moduli space $\mathbf{M}_X(\Lambda, n)$ of semistable $\Lambda$-modules of vanishing Chern classes over an abelian variety $X$, where $\Lambda$ belongs to a certain subclass of $D$-algebras. In particular, for $\Lambda = \mathcal{D}_X$ (resp. ... More
Structure of martingale transports in finite dimensionsFeb 27 2017We study the structure of martingale transports in finite dimensions. We consider the family $\mathcal{M}(\mu,\nu) $ of martingale measures on $\mathbb{R}^N \times \mathbb{R}^N$ with given marginals $\mu,\nu$, and construct a family of relatively open ... More
Threefolds of P^5 with one apparent quadruple pointJul 12 2002In this article we classify all the smooth threefolds of P^5 with an apparent quadruple point provided that the family of its 4-secant lines is an irreducible (first order) congruence. This is sufficient to conclude the classification of all the smooth ... More
Robust improper maximum likelihood: tuning, computation, and a comparison with other methods for robust Gaussian clusteringJun 02 2014Jan 28 2017The two main topics of this paper are the introduction of the "optimally tuned improper maximum likelihood estimator" (OTRIMLE) for robust clustering based on the multivariate Gaussian model for clusters, and a comprehensive simulation study comparing ... More
Consistency, breakdown robustness, and algorithms for robust improper maximum likelihood clusteringSep 26 2013Feb 13 2018The robust improper maximum likelihood estimator (RIMLE) is a new method for robust multivariate clustering finding approximately Gaussian clusters. It maximizes a pseudo-likelihood defined by adding a component with improper constant density for accommodating ... More
A quasi-optimal variant of the Hybrid High-Order method for elliptic PDEs with $H^{-1}$ loadsApr 30 2019Hybrid High-Order methods for elliptic diffusion problems have been originally formulated for loads in the Lebesgue space $L^2(\Omega)$. In this paper we devise and analyze a variant thereof, which is defined for any load in the dual Sobolev space $H^{-1}(\Omega)$. ... More
High-frequency market-making with inventory constraints and directional betsJun 21 2012In this paper we extend the market-making models with inventory constraints of Avellaneda and Stoikov ("High-frequency trading in a limit-order book", Quantitative Finance Vol.8 No.3 2008) and Gueant, Lehalle and Fernandez-Tapia ("Dealing with inventory ... More
Modular forms invariant under non-split Cartan subgroupsMay 17 2018In this paper we describe a method for computing a basis for the space of weight $2$ cusp forms invariant under a non-split Cartan subgroup of prime level $p$. As an application we compute, for certain small values of $p$, explicit equations over $\bf ... More
Towards Probabilistic Generative Models Harnessing Graph Neural Networks for Disease-Gene PredictionJul 12 2019Disease-gene prediction (DGP) refers to the computational challenge of predicting associations between genes and diseases. Effective solutions to the DGP problem have the potential to accelerate the therapeutic development pipeline at early stages via ... More
Mixing time of PageRank surfers on sparse random digraphsMay 13 2019Given a digraph $G$, a parameter $\alpha\in(0,1)$ and a distribution $\lambda$ over the vertices of $G$, the generalised PageRank surf on $G$ with parameters $\alpha$ and $\lambda$ is the Markov chain on the vertices of $G$ such that at each step with ... More
Quantitative phase and polarisation endoscopy applied to detection of early oesophageal tumourigenesisNov 09 2018Phase and polarisation of coherent light are highly perturbed by interaction with microstructural changes in pre-malignant tissue, holding promise for label-free early cancer detection in endoscopically accessible tissues such as the gastrointestinal ... More
On the uniqueness of classical semiconjugations for self-maps of the diskNov 23 2005We study the uniqueness properties of classical semiconjugations for analytic self-maps of the disk, by characterizing them as canonical solutions to certain functional equations. As a corollary, we obtain a complete description of all possible solutions ... More
On the greatest prime factor of (ab+1)(ac+1)May 13 2002We prove that for integers a>b>c>0, the greatest prime factor of (ab+1)(ac+1) tends to infinity with a.
Entropy production in nonlinear recombination modelsSep 22 2016We study the convergence to equilibrium of a class of nonlinear recombination models. In analogy with Boltzmann's H theorem from kinetic theory, and in contrast with previous analysis of these models, convergence is measured in terms of relative entropy. ... More
On the existence time for the Kirchhoff equation with periodic boundary conditionsMay 03 2018We consider the Cauchy problem for the Kirchhoff equation on $\mathbb{T}^d$ with initial data of small amplitude $\varepsilon$ in Sobolev class. We prove a lower bound $\varepsilon^{-4}$ for the existence time, which improves the bound $\varepsilon^{-2}$ ... More
Congruences of Lines with one-dimensional focal locusJul 20 2004In this article we obtain the classification of the congruences of lines with one-dimensional focal locus. It turns out that one can restrict to study the case of $\mathbb{P}^3$.
Quasi-two-dimensional thermoelectricity in SnSeFeb 22 2018Stannous selenide is a layered semiconductor that is a polar analogue of black phosphorus, and of great interest as a thermoelectric material. Unusually, hole doped SnSe supports a large Seebeck coefficient at high conductivity, which has not been explained ... More
Undecidable Properties of Limit Set Dynamics of Cellular AutomataFeb 09 2009Cellular Automata (CA) are discrete dynamical systems and an abstract model of parallel computation. The limit set of a cellular automaton is its maximal topological attractor. A well know result, due to Kari, says that all nontrivial properties of limit ... More
Silence is Golden: exploiting jamming and radio silence to communicateJul 22 2013Jamming techniques require just moderate resources to be deployed, while their effectiveness in disrupting communications is unprecedented. In this paper we introduce several contributions to jamming mitigation. In particular, we introduce a novel adversary ... More
CONCISE: Compressed 'n' Composable Integer SetApr 03 2010Bit arrays, or bitmaps, are used to significantly speed up set operations in several areas, such as data warehousing, information retrieval, and data mining, to cite a few. However, bitmaps usually use a large storage space, thus requiring compression. ... More
Gallavotti-Cohen-Type symmetry related to cycle decompositions for Markov chains and biochemical applicationsSep 23 2010Feb 21 2011We slightly extend the fluctuation theorem obtained in \cite{LS} for sums of generators, considering continuous-time Markov chains on a finite state space whose underlying graph has multiple edges and no loop. This extended frame is suited when analyzing ... More
Cardy Formula for 4d SUSY Theories and LocalizationNov 01 2016We study 4d $\mathcal{N}=1$ supersymmetric theories on a compact Euclidean manifold of the form $S^1 \times\mathcal{M}_3$. Partition functions of gauge theories on this background can be computed using localization, and explicit formulas have been derived ... More
Unified formulation and analysis of mixed and primal discontinuous skeletal methods on polytopal meshesSep 15 2016We propose in this work a unified formulation of mixed and primal discretization methods on polyhedral meshes hinging on globally coupled degrees of freedom that are discontinuous polynomials on the mesh skeleton. To emphasize this feature, these methods ... More
Scaling dimensions in QED$_3$ from the $ε$-expansionAug 12 2017We study the fixed point that controls the IR dynamics of QED in $d = 4 - 2\epsilon$. We derive the scaling dimensions of four-fermion and bilinear operators beyond leading order in $\epsilon$-expansion. For the four-fermion operators, this requires the ... More
Cardy Formula for 4d SUSY Theories and LocalizationNov 01 2016Jan 05 2017We study 4d $\mathcal{N}=1$ supersymmetric theories on a compact Euclidean manifold of the form $S^1 \times\mathcal{M}_3$. Partition functions of gauge theories on this background can be computed using localization, and explicit formulas have been derived ... More
$W^{s,p}$-approximation properties of elliptic projectors on polynomial spaces, with application to the error analysis of a Hybrid High-Order discretisation of Leray-Lions problemsJun 09 2016In this work we prove optimal $W^{s,p}$-approximation estimates (with $p\in[1,+\infty]$) for elliptic projectors on local polynomial spaces. The proof hinges on the classical Dupont--Scott approximation theory together with two novel abstract lemmas: ... More
Confining vacua in SQCD, the Konishi anomaly and the Dijkgraaf-Vafa superpotentialAug 30 2011Sep 05 2011In this paper we revisit the analysis of vacua in N=2 SQCD with generic bare quark masses, softly broken by a mass term for the chiral superfield \Phi in the adjoint representation of the gauge group. These vacua are labelled by an integer r (r vacua) ... More
Scale-factor duality in string Bianchi cosmologiesMar 17 1999Jul 13 1999We apply the scale factor duality transformations introduced in the context of the effective string theory to the anisotropic Bianchi-type models. We find dual models for all the Bianchi-types [except for types $VIII$ and $IX$] and construct for each ... More
O(d,d)-invariance in inhomogeneous string cosmologies with perfect fluidNov 19 1998Nov 20 1998In the first part of the present paper, we show that O(d,d)-invariance usually known in a homogeneous cosmological background written in terms of proper time can be extended to backgrounds depending on one or several coordinates (which may be any space-like ... More
SOS - Securing Open SkiesSep 24 2018Nov 27 2018Automatic Dependent Surveillance - Broadcast (ADS-B) is the next generation communication technology selected for allowing commercial and military aircraft to deliver flight information to both ground base stations and other airplanes. Today, it is already ... More
Cardy Formulae for SUSY Theories in d=4 and d=6Jul 22 2014Oct 14 2014We consider supersymmetric theories on a space with compact space-like slices. One can count BPS representations weighted by (-1)^F, or, equivalently, study supersymmetric partition functions by compactifying the time direction. A special case of this ... More
Virtualization Technologies and Cloud Security: advantages, issues, and perspectivesJul 29 2018Aug 02 2018Virtualization technologies allow multiple tenants to share physical resources with a degree of security and isolation that cannot be guaranteed by mere containerization. Further, virtualization allows protected transparent introspection of Virtual Machine ... More
Coherent transport in extremely underdoped Nd1.2Ba1.8Cu3Oz nanostructuresJul 20 2012Proximity-effect and resistance magneto-fluctuations measurements in submicron Nd1.2Ba1.8Cu3Oz (NBCO) nano-loops are reported to investigate coherent charge transport in the non-superconducting state. We find an unexpected inhibition of cooper pair transport, ... More
The Orbit Space Approach to the Theory of Phase Transitions: The Non-Coregular CaseAug 02 2000We consider the problem of the determination of the isotropy classes of the orbit spaces of all the real linear groups, with three independent basic invariants satisfying only one independent relation. The results are obtained in the $\hat P$-matrix approach ... More
Steady periodic water waves under nonlinear elastic membranesMay 05 2008This is a study of two-dimensional steady periodic travelling waves on the surface of an infinitely deep irrotational ocean, when the top streamline is in contact with a membrane which has a nonlinear response to stretching and bending, and the pressure ... More
Bifurcation and Secondary Bifurcation of Heavy Periodic Hydroelastic Travelling WavesNov 29 2008The paper deals with a problem of interaction between hydrodynamics and mechanics of nonlinear elastic bodies. The existence question for two-dimensional symmetric steady waves travelling on the surface of a deep ocean beneath a heavy elastic membrane ... More
Ground states for fractional magnetic operatorsJan 16 2016We study a class of minimization problems for a nonlocal operator involving an external magnetic potential. The notions are physically justified and consistent with the case of absence of magnetic fields. Existence of solutions is obtained via concentration ... More
Hermitian matrices and cohomology of Kähler varietiesJun 29 2006We give some upper bounds on the dimension of the kernel of the cup product map $H^{1}(X,\mathbb{C})\otimes H^{1}(X,\mathbb{C}) \to H^{2}(X,\mathbb{C})$, where $X$ is a compact K\"ahler variety without Albanese fibrations.
Dynamic Neural Network Channel Execution for Efficient TrainingMay 15 2019Existing methods for reducing the computational burden of neural networks at run-time, such as parameter pruning or dynamic computational path selection, focus solely on improving computational efficiency during inference. On the other hand, in this work, ... More
Transport and selective chaining of bidisperse particles in a travelling wave potentialJul 05 2016We combine experiments, theory and numerical simulation to investigate the dynamics of a binary suspension of paramagnetic colloidal particles dispersed in water and transported above a stripe patterned magnetic garnet film. The substrate generates a ... More