Results for "Stefano Toffanin"

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Ohmic contact engineering in few-layer black Phosphorus field effect transistorsMay 14 2019Achieving good quality Ohmic contacts to van der Waals materials is a challenge, since at the interface between metal and van der Waals material, different conditions can occur, ranging from the presence of a large energy barrier between the two materials ... More
Black Phosphorus based One-dimensional Photonic Crystals and MicrocavitiesJun 23 2016Sep 09 2016The latest achievements in the fabrication of black phosphorus thin layers, towards the technological breakthrough of a phosphorene atomically thin layer, are paving the way for a their employment in electronics, optics, and optoelectronics. In this work, ... More
A Perspective on Recent Advances in Phosphorene Functionalization and its Application in DevicesMar 28 2019Phosphorene, the 2D material derived from black phosphorus, has recently attracted a lot of interest for its properties, suitable for applications in material science. In particular, the physical features and the prominent chemical reactivity on its surface ... More
Quantum Teleportation with Continuous Variables: a surveyApr 05 2006Oct 12 2006Very recently we have witnessed a new development of quantum information, the so-called continuous variable (CV) quantum information theory. Such a further development has been mainly due to the experimental and theoretical advantages offered by CV systems, ... More
Hydrodynamic Limit for an Anharmonic Chain under Boundary TensionFeb 06 2018Jun 11 2018We study the hydrodynamic limit for the isothermal dynamics of an anharmonic chain under hyperbolic space-time scaling under varying tension. The temperature is kept constant by a contact with a heat bath, realised via a stochastic momentum-preserving ... More
On a quadratic functional for scalar conservation lawsNov 12 2013We prove a quadratic interaction estimate for approximate solutions to scalar conservation laws obtained by the wavefront tracking approximation or the Glimm scheme. This quadratic estimate has been used in the literature to prove the convergence rate ... More
On the existence of $L^2$-valued thermodynamic entropy solutions for a hyperbolic system with boundary conditionsNov 13 2018May 13 2019We prove existence of $L^2$-weak solutions of a quasilinear wave equation with boundary conditions. This describes the isothermal evolution of a one dimensional non-linear elastic material, attached to a fixed point on one side and subject to a force ... More
Hydrodynamic Limit for an Anharmonic Chain under Boundary TensionFeb 06 2018We study the hydrodynamic limit for a one dimensional isothermal anharmonic finite chain in Lagrangian coordinates with hyperbolic space-time scaling. The temperature is kept constant by putting the chain in contact with a heat bath, realised via a stochastic ... More
Quadratic interaction functional for general systems of conservation lawsDec 19 2014For the Glimm scheme approximation $u_\epsilon$ to the solution of the system of conservation laws in one space dimension \begin{equation*} u_t + f(u)_x = 0, \qquad u(0,x) = u_0(x) \in \mathbb R^n, \end{equation*} with initial data $u_0$ with small total ... More
Electron localization in pure and defective ceria by a unified LDA+U approachDec 23 2003The electronic and structural properties of pure and defective cerium oxide are investigated using a unified LDA+U approach which allows to treat the different valence states of Ce occurring for different stoichiometries on a same ground, without any ... More
Hydrodynamic Limit for an Anharmonic Chain under Boundary TensionFeb 06 2018May 25 2019We study the hydrodynamic limit for the isothermal dynamics of an anharmonic chain under hyperbolic space-time scaling under varying tension. The temperature is kept constant by a contact with a heat bath, realised via a stochastic momentum-preserving ... More
A note on the existence of $L^2$ valued solutions for a hyperbolic system with boundary conditionsNov 13 2018Feb 08 2019We prove existence of $L^2$-weak solutions of a quasilinear wave equation with boundary conditions.This is done using a vanishing viscosity approximation with mixed Dirichlet-Neumann boundary conditions. In this setting we obtain a uniform a priori estimate ... More
Quadratic interaction functional for systems of conservation laws: a case studyNov 12 2013We prove a quadratic interaction estimate for wavefront approximate solutions to the triangular system of conservation laws \[ \begin{cases} u_t + \tilde f(u,v)_x = 0, \cr v_t - v_x = 0. \end{cases} \] This quadratic estimate has been used in the literature ... More
Performance of the Pierre Auger Fluorescence Detector and Analysis of well recontructed eventsAug 25 2003The Pierre Auger Observatory is designed to elucidate the origin and nature of Ultra High Energy Cosmic Rays using a hybrid detection technique. A first run of data taking with a prototype version of both detectors (the so called Engineering Array) took ... More
Performance of the CMS Tracker Optical Links and Future Upgrade Using Bandwidth Efficient Digital ModulationApr 30 2010(Abridged version) The CMS experiment at the LHC will begin operation in 2007. The CMS Tracker sub-detector, comprises ~10 million detector channels read out by ~40 000 analog optical links. The optoelectronic components have been designed to meet the ... More
Stability and Instability of Extreme Reissner-Nordström Black Hole Spacetimes for Linear Scalar Perturbations IIOct 10 2011This paper contains the second part of a two-part series on the stability and instability of extreme Reissner-Nordstrom spacetimes for linear scalar perturbations. We continue our study of solutions to the linear wave equation on a suitable globally hyperbolic ... More
Stability and Instability of Extreme Reissner-Nordström Black Hole Spacetimes for Linear Scalar Perturbations IOct 10 2011We study the problem of stability and instability of extreme Reissner-Nordstrom spacetimes for linear scalar perturbations. Specifically, we consider solutions to the linear wave equation on a suitable globally hyperbolic subset of such a spacetime, arising ... More
The Wave Equation on Extreme Reissner-Nordström Black Hole Spacetimes: Stability and Instability ResultsJun 02 2010Oct 10 2011We consider solutions to the linear wave equation on a suitable globally hyperbolic subset of an extreme Reissner-Nordstrom spacetime, arising from regular initial data prescribed on a Cauchy hypersurface crossing the future event horizon. We obtain boundedness, ... More
Nonlinear instability of scalar fields on extremal black holesApr 16 2013We prove a new type of finite time blow-up for a class of semilinear wave equations on extremal black holes. The initial data can be taken to be arbitrarily close to the trivial data. The first singularity occurs along the (degenerate) future event horizon. ... More
On Lasso-type estimation for dynamical systems with small noiseDec 27 2009Aug 20 2016We consider a dynamical system with small noise for which the drift is parametrized by a finite dimensional parameter. For this model we consider minimum distance estimation from continuous time observations under L-p penalty imposed on the parameters ... More
Phenomenology of TMDsDec 04 2014We present a review of current Transverse Momentum Dependent (TMD) phenomenology focusing our attention on the unpolarized TMD parton distribution function and the Sivers function. The paper introduces and comments about the new Collins-Soper-Sterman ... More
Localization without recurrence and pseudo-Bloch oscillations in opticsSep 02 2015Dynamical localization, i.e. the absence of secular spreading of a quantum or classical wave packet, is usually associated to Hamiltonians with purely point spectrum, i.e. with a normalizable and complete set of eigenstates, which show quasi-periodic ... More
Dark Radiation and Inflationary FreedomFeb 18 2016We perform a cosmological analysis in which we allow the primordial power spectrum of scalar perturbations to assume a shape that is different with respect to the usual power-law, arising from the simplest models of cosmological inflation. We parametrize ... More
Transparency in nonlinear frequency conversionNov 02 2015Mar 29 2016Suppression of wave scattering and the realization of transparency effects in engineered optical media and surfaces have attracted great attention in the past recent years. In this work the problem of transparency is considered for optical wave propagation ... More
Quantum decay and amplification in a non-Hermitian unstable continuumMay 10 2016The decay of a bound state weakly-coupled to a non-Hermitian tight-binding unstable continuum, i.e. a continuum of states comprising energies with positive imaginary part, is theoretically investigated. As compared to quantum decay in an Hermitian continuum, ... More
New Developments in CosmologyMar 30 2016In this Thesis I discuss several recent results obtained using the CMB spectra measured by Planck and several other cosmological probes. Extensions of the $\Lambda$CDM model are studied, including the presence of an additional sterile neutrino (motivated ... More
X-ray imaging of spin currents and magnetisation dynamics at the nanoscaleNov 23 2016Understanding how spins move in time and space is the aim of both fundamental and applied research in modern magnetism. In the past three decades, research in this field has led to technological advances that have had a major impact on our society, while ... More
Optical parametric amplification and oscillation assisted by low-frequency stimulated emissionMar 17 2016Optical parametric amplification/oscillation provide a powerful tool for coherent light generation in spectral regions inaccessible to lasers. Parametric gain is based on a frequency {\it down-conversion} process, and thus it can not be realized for signal ... More
Entropy, energy and temperature-length inequality for Friedmann universesFeb 12 2016Mar 07 2016In this paper we continue the study of the physical consequences of our modified black hole entropy formula in expanding spacetimes. In particular, we apply the new formula to apparent horizons of Friedmann expanding universes with zero, negative and ... More
Non-Hermitian tight-binding network engineeringJan 14 2016We suggest a simple method to engineer a tight-binding quantum network based on proper coupling to an auxiliary non-Hermitian cluster. In particular, it is shown that effective complex non-Hermitian hopping rates can be realized with only complex on-site ... More
On the Modeling of Musical Solos as Complex NetworksOct 03 2016Notes in a musical piece are building blocks employed in non-random ways to create melodies. It is the "interaction" among a limited amount of notes that allows constructing the variety of musical compositions that have been written in centuries and within ... More
Visual-Inertial Scene RepresentationsJun 13 2016We describe a representation of a scene that captures geometric and semantic attributes of objects within, along with their uncertainty. Objects are assumed persistent in the scene, and their likelihood computed from intermittent visual data using a convolutional ... More
Accelerated and Airy-Bloch oscillationsSep 16 2015May 24 2016A quantum particle subjected to a constant force undergoes an accelerated motion following a parabolic path, which differs from the classical motion just because of wave packet spreading (quantum diffusion). However, when a periodic potential is added ... More
Colourful FKS subtractionJun 01 2011I formulate in a colour-friendly way the FKS method for the computation of QCD cross sections at the next-to-leading order accuracy. This is achieved through the definition of subtraction terms for squared matrix elements, constructed with single colour-dressed ... More
An alternative approach to b->sγin the unconstrained MSSMApr 15 2002The gluino contributions to the $C'_{7,8}$ Wilson coefficients for b->s\gamma are calculated within the unconstrained MSSM. New stringent bounds on the \dRLbs and \dRRbs mass insertion parameters are obtained in the limit in which the SM and SUSY contributions ... More
Breaking entanglement-breaking by classical correlationsJul 22 2013The inevitable interaction between quantum systems and environment induces effects of decoherence which may be so strong as to destroy any initial entanglement between the systems, a phenomenon known as "entanglement breaking". Here we show the simplest ... More
Progress in perturbative QCDJun 17 1997Jun 25 1997We briefly summarize some recent theoretical developments in perturbative QCD, emphasizing new ideas which have led to widening the domain of applicability of perturbation theory. In particular, it is now possible to calculate efficiently processes with ... More
Violation of the Bjorken Sum Rule in QCDNov 07 1992Nov 17 1992We show that the Bjorken sum rule for the first moment of the polarized nucleon structure function $g_1$ is not necessarily satisfied in QCD if the axial anomaly is taken into account. We argue that nonperturbative QCD effects should lead to a violation ... More
Spin in quantum field theoryJul 29 2005Aug 29 2006I introduce spin in field theory by emphasizing the close connection between quantum field theory and quantum mechanics. First, I show that the spin-statistics connection can be derived in quantum mechanics without relativity or field theory. Then, I ... More
Relativistic Quantum Theory with Fractional Spin and StatisticsJul 07 1993These lectures discuss the formulation of quantum mechanics with fractional spin and statistics in 2+1 dimensions in a relativistic setting, emphasizing the path-integral approach. The non-relativistic theory is reviewed from a path-integral viewpoint. ... More
Accelerating the pace of discovery by changing the peer review algorithmNov 02 2009The number of scientific publications is constantly rising, increasing the strain on the review process. The number of submissions is actually higher, as each manuscript is often reviewed several times before publication. To face the deluge of submissions, ... More
Some results on ideal impacts of billiard ballsNov 23 2007We analyze the impact of two equal billiard balls in three ideal situations: when the balls freely slide on the plane of the billiard, when they roll without sliding and when one of them freely slides and the other rolls. In all the cases we suppose that ... More
Holographic Grid Cloud, a futurable high storage technology for the next generation astronomical facilitiesDec 28 2011Jan 09 2012In the immediate future holographic technology will be available to store a very large amount of data in HVD (Holographic Versatile Disk) devices. This technology make extensive use of the WORM (Write-Once-Read-Many) paradigm: this means that such devices ... More
Markovian feedback to control continuous variable entanglementMar 26 2005Apr 18 2005We present a model to realize quantum feedback control of continuous variable entanglement. It consists of two interacting bosonic modes subject to amplitude damping and achieving entangled Gaussian steady state. The possibility to greatly improve the ... More
Defect and evaluationsApr 16 1996Let $S$ be a generic submanifold of $C^N$ of real codimension m. In this work we continue the study, carried over by various authors, of the set of analytic discs attached to S. Let $M$ be the set of analytic discs attached to $S.$ Given $q \in S$ let ... More
TOTEM: The experiment to measure the total proton-proton cross section at LHCDec 21 2006The current large uncertainty on the extrapolation of the proton-proton total cross section at the LHC energy will be resolved by the precise measurement by the TOTEM experiment. Its accurate studies on the basic properties of proton-proton collisions ... More
Beyond the Standard Model at Belle: B to K*l+l- and search for leptonic B decaysMay 29 2006We report the first measurement of the forward-backward asymmetry and the ratios of Wilson coefficients A_9/A_7 and A_10/A_7 in B to K*l+l-, obtained using 386M BBbar pairs that were collected at the Y(4S) resonance with the Belle detector at the KEKB ... More
Supersymmetric transparent optical intersectionsNov 26 2014Jan 09 2015Supersymmetric (SUSY) optical structures provide a versatile platform to manipulate the scattering and localization properties of light, with potential applications to mode conversion, spatial multiplexing and invisible devices. Here we show that SUSY ... More
Anti-Newtonian dynamics and self-induced Bloch oscillations of correlated particlesSep 01 2014We predict that two correlated particles hopping on a one-dimensional Hubbard lattice can show transient self-acceleration and self-induced Bloch oscillations as a result of anti-Newtonian dynamics. Self-propulsion occurs for two particles with opposite ... More
Invisible surface defects in a tight-binding latticeJun 24 2014Surface Tamm states arise in one-dimensional lattices from some defects at the lattice edge and their energy generally falls in a gap of the crystal. The defects at the surface change rather generally the phase of propagative Bloch waves scattered off ... More
Exceptional points and Bloch oscillations in non-Hermitian lattices with unidirectional hoppingApr 14 2014The spectral and transport properties of a non-Hermitian tight-binding lattice with unidirectional hopping are theoretically investigated in three different geometrical settings. It is shown that, while for the infinitely-extended (open) and for the ring ... More
Zak phase of photons in optical waveguide latticesOct 18 2013Zak phase, i.e. the Berry phase acquired during an adiabatic motion of a Bloch particle across the Brillouin zone, provides a measure of the topological invariant of Bloch bands in one-dimensional crystalline potentials. Here a photonic structure, based ... More
Coherent perfect absorption in a homogeneously-broadened two-level mediumNov 15 2011In recent works, it has been shown rather generally that the time-reversed process of lasing at threshold realizes a coherent perfect absorber (CPA). In a CPA, a lossy medium in an optical cavity with a speci?c degree of dissipation, equal in modulus ... More
Photonic Bloch oscillations of correlated particlesNov 15 2011A photonic realization of Bloch oscillations (BOs) of two correlated electrons that move on a one-dimensional periodic lattice, based on spatial light transport in a square waveguide array with a defect line, is theoretically proposed. The signature of ... More
Airy beams from a microchip laserFeb 02 2011It is theoretically shown that an end-pumped microchip laser formed by a thin laser crystal with plane-plane but slightly tilted facets can emit, under appropriate pumping conditions and near a crystal edge, a truncated self-accelerating Airy output beam. ... More
Dynamical trapping of light in modulated waveguide latticesFeb 02 2011A discrete analogue of the dynamical (Kapitza) trapping effect, known for classical and quantum particles in rapidly oscillating potentials, is proposed for light waves in modulated graded-index waveguide lattices. As in the non-modulated waveguide lattice ... More
Photonic realization of the relativistic Dirac oscillatorSep 01 2010A photonic realization of the Dirac oscillator (DO), i.e. of the relativistic extension of the quantum harmonic oscillator, is proposed for light propagation in fiber Bragg gratings. Transmission spectra clearly show the existence of electron and positron ... More
Phase transitions in Wick-rotated $\mathcal{PT}$-symmetric opticsOct 08 2014May 15 2015$\mathcal{PT}$-symmetric models with a Wick rotation of time ($ t \rightarrow \pm i t$) show spectral phase transitions that are similar to those of dissipative systems driven out of equilibrium. Optics can provide an accessible test bed to explore spectral ... More
Adiabatic quantum state transfer in tight-binding chains using periodic driving fieldsAug 08 2014A method for high-fidelity coherent adiabatic transport in a zig-zag tight-binding chain, based on application of two external periodic driving fields, is theoretically proposed. The method turns out to be robust against imperfections and disorder of ... More
Aharonov-Bohm photonic cages in waveguide and coupled resonator lattices by synthetic magnetic fieldsJul 13 2014Sep 27 2014We suggest a method for trapping photons in quasi one-dimensional waveguide or coupled-resonator lattices, which is based on an optical analogue of the Aharonov-Bohm cages for charged particles. Light trapping results from a destructive interference of ... More
Effective magnetic fields for photons in waveguide and coupled resonator latticesOct 18 2013A method to realize effective magnetic fields for photons in square lattices of coupled optical waveguides or resonators is suggested, which is inspired by an optical analogue of photon-assisted tunneling of atom optics. It is shown that an artificial ... More
Optical realization of two-boson tunneling dynamicsNov 15 2011An optical realization of the tunneling dynamics of two interacting bosons in a double-well potential, based on light transport in a four-core microstructured fiber, is proposed. The optical setting enables to visualize in a purely classical system the ... More
Jaynes Cummings Photonic SuperlatticesNov 15 2011A classical realization of the Jaynes-Cummings (JC) model, describing the interaction of a two-level atom with a quantized cavity mode, is proposed based on light transport in engineered waveguide superlattices. The optical setting enables to visualize ... More
On systems with finite ergodic degreeAug 04 2003In this paper we study the ergodic theory of a class of symbolic dynamical systems $(\O, T, \mu)$ where $T:{\O}\to \O$ the left shift transformation on $\O=\prod_0^\infty\{0,1\}$ and $\mu$ is a $\s$-finite $T$-invariant measure having the property that ... More
A general method for the determination of duration of solar cycle maximaOct 10 2013The use of different solar activity indices like sunspot numbers, sunspot areas, flare index, magnetic fields, etc., allows us to investigate the time evolution of some specific features of the solar activity and the underlying dynamo mechanism. One of ... More
Solar Cycle 24: is the peak coming?Sep 27 2012Sep 28 2012Solar cycle activity forecasting, mainly its magnitude and timing, is an essential issue for numerous scientific and technological applications: in fact, during an active solar period, many strong eruptions occur on the Sun with increasing frequency, ... More
On the correlation between air temperature and the core Earth processes: Further investigations using a continuous wavelet analysisMar 25 2011In a recent article by Dickey, J. O., Marcus, S.L. and O. de Viron, 2011, the authors show evidences for correlations in the multi-decadal variability of Earth's rotation rate [i.e., length of day (LOD)], the angular momentum of the core (CAM), and natural ... More
Auto-Correlation Functions and Solar Cycle PredictabilityOct 05 2000Starting from the traditional definition of auto-correlation function we can introduce a new quantity, based on the wavelet formalism, called local wavelet auto-correlation function, which contains more information about the correlation properties on ... More
Minisuperspace, WKB, Quantum States of General Relativistic Extended ObjectsOct 18 2004The dynamics of relativistic thin shells is a recurrent topic in the literature about the classical theory of gravitating systems and the still ongoing attempts to obtain a coherent description of their quantum behavior. Certainly, a good reason to make ... More
Lorentz breaking Effective Field Theory and observational testsMar 19 2012Jul 19 2012Analogue models of gravity have provided an experimentally realizable test field for our ideas on quantum field theory in curved spacetimes but they have also inspired the investigation of possible departures from exact Lorentz invariance at microscopic ... More
Categorical Semantics for Schrödinger's EquationJan 23 2015Feb 25 2015Applying ideas from monadic dynamics to the well-established framework of categorical quantum mechanics, we provide a novel toolbox for the simulation of finite-dimensional quantum dynamics. We use strongly complementary structures to give a graphical ... More
Higgs signals and hard photons via $WW$-fusion in the Standard Model at the Next Linear ColliderJun 07 1996Within the framework of the Standard Model, integrated and differential distributions are given for Higgs production via the $WW$-fusion mechanism and decay via the channels $H\ar b\bar b$ and $H\ar WW\ar {jjjj}$, with and without photon radiation, at ... More
Finite width and irreducible background effects to $t\bar t$ production at $γγ$ Next Linear CollidersJun 30 1995We study the complete process \phphbbww\ using exact matrix element computations at tree-level, at a $\sqrt s=500$ GeV \eeb\ linear collider of the next generation. Incoming photons produced via back-scattering of laser light are considered. Sizable effects ... More
Intermediate mass Higgs bosons at TeV $eγ$ colliders in the ${\cal {MSSM}}$Jan 20 1994Jan 24 1994We study the cross sections for the production of intermediate mass Higgs bosons via the reactions $e^-\gamma\rightarrow \nu_eW^-\Phi^0$, $e^-\gamma\rightarrow \nu_eH^-\Phi^0$, $e^-\gamma\rightarrow e^-Z^0\Phi^0$ and $e^-\gamma\rightarrow e^-H^+H^-$ in ... More
e+e- -> 6 jets in parton level QCD at LEP1, LEP2 and NLCNov 28 1997We study electron-positron annihilations into six jets at the parton level in perturbative Quantum Chromo-Dynamics. We use helicity amplitude methods. Results are presented for the case of the Durham and Cambridge jet clustering algorithms at three different ... More
W+4jet irreducible background events from QCD in top and Higgs searches at the Next Linear ColliderNov 26 1996Irreducible background effects due to $e^+e^-\to W^\pm + bbjj$ and $e^+e^-\to W^\pm + jjjj$ events produced via QCD in top-antitop production and heavy Higgs searches in the bremsstrahlung channel are studied at the Next Linear Collider. Various distributions ... More
A SSC model for the spectral variability of the intermediate blazar ON 231May 23 2002In April-May 1998 the blazar ON 231 (W Com, B2 1219+28) showed an extraordinary optical outburst alerted by the Perugia Astronomical Observatory. The source reached the most luminous state, observed at least since the beginning of the previous century. ... More
New Physics searches in heavy flavours in ATLASNov 12 2013Nov 19 2013Precision determinations of the flavour sector allow the search for indirect new physics signatures. At the forefront of these studies are the determinations of interference of new physics with known $\upDelta F=1$ and $\upDelta F=2$ processes. The ATLAS ... More
Bulk spectroscopic measurement of the topological charge of Weyl nodes with resonant x-raysApr 13 2016Sep 20 2016We formulate a bulk spectroscopic method for direct measurement of the topological invariant of nondegenerate band crossings in Weyl semimetals. We demonstrate how polarization-resolved resonant x-ray scattering captures the winding of the Berry flux ... More
Leptonic asymmetry in ttbar production at CDFJul 27 2013The leptonic asymmetry in semileptonic ttbar decays is measured with the CDF detector using the full Tevatron Run II dataset, which corresponds to 9.4 fb^-1 of integrated luminosity. The measured asymmetry is extrapolated to the full kinematic range and ... More
Charm OverviewNov 23 1999This paper is aimed at giving a complete review of the latest (post-1998 Physics in Collision conference) experimental results on charm physics.
Cosmic rays and molecular cloudsAug 24 2012This paper deals with the cosmic-ray penetration into molecular clouds and with the related gamma--ray emission. High energy cosmic rays interact with the dense gas and produce neutral pions which in turn decay into two gamma rays. This makes molecular ... More
Non-Hermitian Floquet invisibilityDec 02 2016Wave transport and scattering in open systems can be profoundly affected by non- Hermitian dynamics. In this work we consider wave scattering in a one-dimensional tight-binding lattice with a low-frequency harmonically-vibrating complex site potential. ... More
2HDM Charged Higgs Boson Searches at the LHC: Status and ProspectsDec 06 2016We review status and prospects of searches for the charged Higgs boson of 2-Higgs Doublet Models of all Yukawa types at the Large Hadron Collider
Space-borne Gravitational Wave ObservatoriesApr 11 2014The paper describes the progress toward a space-borne gravitational wave observatory and its foreseeable science potential. In particular the paper describes the status of the LISA-like mission called eLISA, the reference mission for the Gravitational ... More
Phase retrieval by power iterationsDec 03 2012I show that the power iteration method applied to the phase retrieval problem converges under special conditions. One is given the relative phases between small non-overlapping groups of pixels of a recorded intensity pattern, but no information on the ... More
Quasidiagonality of crossed productsOct 18 2007Nov 30 2008We prove that the crossed product A x G of a separable, unital, quasidiagonal C*- algebra A by a discrete, countable, amenable, maximally almost periodic group G is quasidiagonal, provided that the action is almost periodic.
On quantum illumination, quantum reading, and the capacity of quantum computationDec 20 2018In this brief note, I clarify the crucial differences between three different protocols of quantum channel discrimination, after some confusion has appeared in recent literature.
Photonic Flatband LaserDec 08 2018Flatband photonic lattices, i.e. arrays of waveguides or resonators displaying a flat Bloch band, offer new routes for light trapping and distortion-free imaging. Here it is shown that flatland lattices can show stable and cooperative laser emission when ... More
A Concept-Centered Hypertext Approach to Case-Based RetrievalNov 27 2018The goal of case-based retrieval is to assist physicians in the clinical decision making process, by finding relevant medical literature in large archives. We propose a research that aims at improving the effectiveness of case-based retrieval systems ... More
Gradient estimates for nonlinear elliptic equations with first order termsJan 09 2019Mar 13 2019We study existence and Lorentz regularity of distributional solutions to elliptic equations with either a convection or a drift first order term. The presence of such a term makes the problem not coercive. The main tools are pointwise estimates of the ... More
Higher-order CPM ConstructionsMay 30 2018Jan 29 2019We define a higher-order generalisation of the CPM construction based on arbitrary finite abelian group symmetries of symmetric monoidal categories. We show that our new construction is functorial, and that its closure under iteration can be characterised ... More
Computing the ideal class monoid of an orderMay 24 2018Jun 21 2018There are well known algorithms to compute the class group of the maximal order $\mathcal{O}_K$ of a number field $K$ and the group of invertible ideal classes of a non-maximal order $R$. In this paper we explain how to compute also the isomorphism classes ... More
Dualities for Plonka sumsApr 06 2018Sep 03 2018Plonka sums consist of an algebraic construction similar, in some sense to direct limits, which allows to represent classes of algebras defined by means of regular identities (namely those equations where the same set of variables appears on both sides). ... More
Parity-Time Symmetry meets Photonics: A New Twist in non-Hermitian OpticsFeb 14 2018In the past decade, the concept of parity-time ($\mathcal{PT}$) symmetry, originally introduced in non-Hermitian extensions of quantum mechanical theories, has come into thinking of photonics, providing a fertile ground for studying, observing, and utilizing ... More
Zero limit of entropic relaxation time for the Shliomis model of ferrofluidsFeb 11 2018Sep 12 2018We construct solutions for the Shilomis model of ferrofluids in a critical space, uniformly in the entropic relaxation time $ \tau \in\left(0, \tau_0\right) $. This allows us to study the convergence when $ \tau\to 0 $ for such solutions.
Building a linear equation of state for trapped gravitons from finite size effects and the Schwarzschild black hole caseFeb 06 2018Mar 02 2018In this paper we continue the investigations present in \cite{1} and \cite{2} concerning the spectrum of trapped gravitons in a spherical box, and in particular inside a Schwarzschild black hole (BH). We explore the possibility that, due to finite size ... More
Hydrodynamic limit for a diffusive system with boundary conditionsMar 20 2019We study the hydrodynamic limit for the isothermal dynamics of an anharmonic chain under hyperbolic space-time scaling and an external varying tension. The temperature is kept constant by a contact with a heat bath, realised via a stochastic momentum-preserving ... More
Topological phase transition in non-Hermitian quasicrystalsMay 23 2019The discovery of topological phases in non-Hermitian open classical and quantum systems challenges our current understanding of topological order. Non-Hermitian systems exhibit unique features with no counterparts in topological Hermitian models, such ... More
The isoperimetric profile of a compact Riemannian Manifold for small volumesOct 07 2007We show that, the solutions of the isoperimetric problem for small volumes are $C^{2,\alpha}$-close to small spheres. On the way, we define a class of submanifolds called pseudo balls, defined by an equation weaker than constancy of mean curvature. We ... More