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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
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
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 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
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
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
Organised crime infiltration in the legitimate private economy - An empirical network analysis approachMar 20 2014It is estimated that Italian Mafias registered 135 billion euros in profits only in 2010. Part of this huge amount of money, coming mostly from the drugs, prostitution and arms illicit markets, is often used to invest into legitimate private economies. ... More
Divisorial models of normal varietiesNov 07 2012May 05 2015We prove that the canonical ring of a canonical variety in the sense of de Fernex and Hacon is finitely generated. We prove that canonical varieties are klt if and only if R(-K_X) is finitely generated. We introduce a notion of nefness for non-Q-Gorenstein ... More
Gauge boson couplings at LEPOct 14 2004A review is given of the measurements of triple and quartic couplings among the electroweak gauge bosons performed at LEP by the four experiments ALEPH, DELPHI, L3 and OPAL. Emphasis is placed on recently published results and on combinations of results ... More
A Quantum Teleportation GameJul 29 2004Nov 17 2004We investigate a game where a sender (Alice) teleports coherent states to two receivers (Bob and Charlie) through a tripartite Gaussian state. The aim of the receivers is to optimize their teleportation fidelities by means of local operations and classical ... More
Quantum Reading of a Classical Digital MemoryMar 17 2011We consider a basic model of digital memory where each cell is composed of a reflecting medium with two possible reflectivities. By fixing the mean number of photons irradiated over each memory cell, we show that a non-classical source of light can retrieve ... More
Chiral behaviour of the pion decay constant in $N_f=2$ QCDNov 13 2013Nov 25 2013As increased statistics and new ensembles with light pions have become available within the CLS effort, we complete previous work by inspecting the chiral behaviour of the pion decay constant. We discuss the validity of Chiral Perturbation Theory ($\chi$PT) ... More
GRB Afterglow Polarimetry: Past, Present and FutureJun 30 2009Gamma-ray bursts and their afterglows are thought to be produced by an ultrarelativistic jet. One of the most important open questions is the outflow composition: the energy may be carried out from the central source either as kinetic energy (of baryons ... More
Talbot self-imaging in $\mathcal{PT}$-symmetric complex crystalsSep 28 2014The Talbot effect, i.e. the self-imaging property of a periodic wave in near-field diffraction, is a remarkable interference phenomenon in paraxial systems with continuous translational invariance. In crystals, i.e. systems with discrete translational ... More
Many-body coherent destruction of tunneling in photonic latticesNov 15 2011An optical realization of the phenomenon of many-body coherent destruction of tunneling, recently predicted for interacting many-boson systems by Gong, Molina and Haenggi [Phys. Rev. Lett. 103, 133002 (2009)], is proposed for light transport in engineered ... More
Classical Simulation of Relativistic Quantum Mechanics in Periodic Optical StructuresNov 15 2011Spatial and/or temporal propagation of light waves in periodic optical structures offers a rather unique possibility to realize in a purely classical setting the optical analogues of a wide variety of quantum phenomena rooted in relativistic wave equations. ... More
Optical realization of the two-site Bose-Hubbard model in waveguide latticesJan 25 2011A classical realization of the two-site Bose-Hubbard Hamiltonian, based on light transport in engineered optical waveguide lattices, is theoretically proposed. The optical lattice enables a direct visualization of the Bose-Hubbard dynamics in Fock space. ... More
Low-frequency anomalies in dynamic localizationMay 11 2014Quantum mechanical spreading of a particle hopping on tight binding lattices can be suppressed by the application of an external ac force, leading to periodic wave packet reconstruction. Such a phenomenon, referred to as dynamic localization (DL), occurs ... More
Bound states in the continuum in PT-symmetric optical latticesFeb 16 2014Bound states in the continuum (BIC), i.e. normalizable modes with an energy embedded in the continuous spectrum of scattered states, are shown to exist in certain optical waveguide lattices with $\mathcal{PT}$-symmetric defects. Two distinct types of ... More
Quantum simulation of decoherence in optical waveguide latticesOct 27 2013We suggest that propagation of nonclassical light in lattices of optical waveguides can provide a laboratory tool to simulate quantum decoherence phenomena with high non-Markovian features. As examples, we study decoherence of optical Schr\"{o}dinger ... More
Invisibility in non-Hermitian tight-binding latticesAug 31 2010Reflectionless defects in Hermitian tight-binding lattices, synthesized by the intertwining operator technique of supersymmetric quantum mechanics, are generally not invisible and time-of-flight measurements could reveal the existence of the defects. ... More
Spatio-temporal wave propagation in photonic crystals: a Wannier-function analysisSep 02 2004A general analysis of undistorted propagation of localized wavepackets in photonic crystals based on a Wannier-function expansion technique is presented. Different kinds of propagating and stationary spatio-temporal localized waves are found from an asymptotic ... More
WKB metastable quantum states of a de Sitter--Reissner-Nordstroem dust shellOct 01 2003We study the dynamics of a spherically symmetric dust shell separating two spacetime domains, the 'interior' one being a part of the de Sitter spacetime and the exterior one having the 'extremal' Reissner-Nordstroem geometry. Extending the ideas of previous ... More
Selective cloning of Gaussian states by linear opticsApr 23 2007We investigate the performances of a selective cloning machine based on linear optical elements and Gaussian measurements, which allows to clone at will one of the two incoming input states. This machine is a complete generalization of a 1 to 2 cloning ... More
A comment on anti-brane singularities in warped throatsFeb 16 2012We compute the imaginary self-dual (ISD) and imaginary anti-self-dual (IASD) fluxes for the Klebanov-Strassler background perturbed by a stack of p anti-D3 branes. We show that, at linear order in p, they both have a singularity in the near-brane region. ... More
Metastable Vacua and the Backreacted Stenzel GeometryOct 11 2011We construct an M-theory background dual to the metastable state recently discussed by Klebanov and Pufu, which corresponds to placing a stack of anti-M2 branes at the tip of a warped Stenzel space. With this purpose we analytically solve for the linearized ... More
Standard Model Higgs boson production and hard photon radiation in $e^+e^-\to μ^+μ^- b\bar bγ$ events at LEP II and Next Linear ColliderDec 22 1995Mar 28 1996We study at LEP II and Next Linear Collider energies Higgs production via the bremsstrahlung channel $e^+e^-\ar ZH$, with $Z\ar \mu^+\mu^-$ and $H\ar b\bar b$, and the corresponding irreducible background, in presence of hard photon radiation, both from ... More
Heavy Higgs production and decay via $e^+e^-\to Z^0 H^0 \to b\bar bZ^0Z^0$ and irreducible backgrounds at Next Linear CollidersJan 14 1995The complete matrix element for $e^+e^-\ar b\bar bZ^0Z^0$ has been computed at tree--level and applied to $Z^0H^0$--production followed by $Z^0\ar b\bar b$ and $H^0\ar Z^0Z^0$, including all the irreducible background, at Next Linear Colliders. We find ... More
Given Talk at Moriond 2006: Fermion Mass in E6 GUT with Discrete Family Permutation Symmetry S3May 15 2006A discrete symmetry S3 easily explains all neutrino data. However it is not obvious the embedding of S3 in GUT where all fermions live in the same representation. We show that embedding S3 in E6 it is possible to make distinction between neutrinos and ... More
Transmutation of N=2 fractional D3 branes into twisted sector fluxesApr 15 2009Jun 23 2009We study the prototype of fractional D3 branes at non-isolated singularities in gauge/gravity duality at the nonperturbative level. We embed the quantum moduli space of N=2 SU(M) pure SYM, the gauge theory on fractional D3 branes at the A_1 singularity, ... More
Anomaly-Induced Magnetic Screening in 2+1 dimensional QED at Finite DensityMar 19 1993May 20 1993We show that in 2+1 dimensional Quantum Electrodynamics an external magnetic field applied to a finite density of massless fermions is screened, due to a $2+1$-dimensional realization of the underlying $2$-dimensional axial anomaly of the space components ... More
Gravity-analogy in one-dimensional ideal Fermi fluids and Burgers' equationOct 14 2010An hydrodynamic description of a one-dimensional flow of an ideal Fermi fluid is constructed from a semiclassical approximation. For an initially fully degenerate fluid, Euler and continuity hydrodynamic equations are dual to two uncoupled inviscid Burgers' ... More
Short-term Predictable Power of a Wind Farm via Distributed Control of Wind Generators with Integrated StorageFeb 12 2016In this paper we introduce a Leader-follower consensus protocol and study its stability properties with and without communication delays. On the practical side, we explore its application on coordinating a group of wind Double-Fed Induction Generators ... More
Static BPS black holes in U(1) gauged supergravityMay 19 2014Sep 08 2014We consider the flow equations for $1/4$-BPS asymptotically AdS$_4$ static black holes in Fayet-Iliopoulos gauged supergravity, using very special geometry identities to obtain a simplified form in the most general case. Under mild assumptions on the ... More
Shearing a glass and the role of pin-delay in models of interface depinningOct 21 2013Aug 04 2014When a disordered solid is sheared, yielding is followed by the onset of intermittent response that is characterized by slip in local regions usually labeled shear-transformation zones (STZ). Such intermittent response resembles the behavior of earthquakes ... More
A counterexample for a suptheorem in locally convex spacesOct 12 2009Oct 24 2009In this brief note, we provide an example of non complete locally convex space $E$ with a $\sigma(E, E^*)$ closed bounded subset $C\subset E$, which is not $\sigma(E, E^*)$-compact, even if every $\varphi\in E^*$ attains its sup over $C$.
A successive sub-grouping method for multiple sequence alignments analysisMay 30 2007Jun 07 2007A novel approach to protein multiple sequence alignment is discussed: substantially this method counterparts with substitution matrix based methods (like Blosum or PAM based methods), and implies a more deterministic approach to chemical/physical sub-grouping ... More
Gamma Ray Astronomy and the Origin of Galactic Cosmic RaysNov 05 2008Diffusive shock acceleration operating at expanding supernova remnant shells is by far the most popular model for the origin of galactic cosmic rays. Despite the general consensus received by this model, an unambiguous and conclusive proof of the supernova ... More
Shock acceleration and gamma radiation in the intracluster mediumJan 08 2004Particle acceleration is expected to take place at shocks that form during the process of large scale structure formation. Electrons accelerated at such shocks can upscatter a small fraction of the photons in the cosmic microwave background up to the ... More
Spectroscopy of D MesonsDec 29 2005Feb 12 2006The scenario of heavy quark meson spectroscopy underwent recently a major revolution, after the observation of BABAR and CLEO, confirmed by BELLE, of $\DsJ$ L=1 excited states, and by further evidences by SELEX. These experimental results have cast doubts ... More
Particle Dark Matter CandidatesNov 19 2007Nov 27 2007I give a short overview on some of the favorite particle Cold Dark Matter candidates today, focusing on those having detectable interactions: the axion, the KK-photon in Universal Extra Dimensions, the heavy photon in Little Higgs and the neutralino in ... More
Solar cycle full-shape predictions: a global error evaluation for cycle 24Jun 06 2016There are many proposed prediction methods for solar cycles behavior. In a previous paper we updated the full-shape curve prediction of the current solar cycle 24 using a non-linear dynamics method and we compared the results with the predictions collected ... More
Guitar Solos as NetworksMar 16 2016This paper presents an approach to model melodies (and music pieces in general) as networks. Notes of a melody can be seen as nodes of a network that are connected whenever these are played in sequence. This creates a directed graph. By using complex ... More
Synthetic gauge fields for light beams in optical resonatorsApr 30 2015A method to realize artificial magnetic fields for light waves trapped in passive optical cavities with anamorphic optical elements is theoretically proposed. In particular, when a homogeneous magnetic field is realized, a highly-degenerate Landau level ... More
Light Sterile Neutrinos In CosmologyJan 07 2016We briefly discuss the main effects of the presence of a Light Sterile Neutrino (LS$\nu$) in Cosmology and how its properties can be constrained by Cosmic Microwave Background (CMB) and other cosmological measurements.
Capacities of repeater-assisted quantum communicationsJan 05 2016Jul 03 2016We establish the ultimate rates for transmitting quantum information, distilling entanglement, and distributing secret keys in repeater-assisted quantum communications, under the most fundamental decoherence models for both discrete and continuous variable ... More
Tight-binding lattices with an oscillating imaginary gauge fieldMar 30 2016We consider non-Hermitian dynamics of a quantum particle hopping on a one-dimensional tight-binding lattice made of $N$ sites with asymmetric hopping rates induced by a time-periodic oscillating imaginary gauge field. A deeply different behavior is found ... More
Light sterile neutrinos and pseudoscalar interactions in cosmologyOct 05 2016The Short BaseLine (SBL) neutrino oscillations anomalies hint at the presence of a sterile neutrino with a mass of around 1 eV. However, such neutrino is highly incompatible with the cosmological data, in particular from the Cosmic Microwave Background ... More
Do not mess with time: Probing faster than light travel and chronology protection with superluminal warp drivesJan 05 2016While General Relativity ranks undoubtedly among the best physics theories ever developed, it is also among those with the most striking implications. In particular, General Relativity admits solutions which allow faster than light motion and consequently ... More
Secure Compute-and-Forward Transmission With Artificial Noise and Full-Duplex DevicesJun 14 2016We consider a wiretap channel with an eavesdropper (Eve) and an honest but curious relay (Ray). Ray and the destination (Bob) are full-duplex (FD) devices. Since we aim at not revealing information on the secret message to the relay, we consider the scaled ... More
Dark Radiation and Inflationary FreedomOct 20 2015A relaxed primordial power spectrum (PPS) of scalar perturbations arising from inflation can impact the dark radiation constraints obtained from Cosmic Microwave Background and other cosmological measurements. If inflation produces a non-standard PPS ... More
Half-spectral unidirectional invisibility in non-Hermitian periodic optical structuresOct 19 2015The phenomenon of half-spectral unidirectional invisibility is introduced for one-dimensional periodic optical structures with tailored real and imaginary refractive index distributions in a non-$\mathcal{PT}$-symmetric configuration. The effect refers ... More
Operational Mermin non-locality and All-vs-Nothing argumentsOct 11 2015Contextuality is a key resource in quantum information and the device-independent security of quantum algorithms. In this work, we show that the recently developed, operational Mermin non-locality arguments provide a large, novel family of quantum realisable ... More
Lectures on Integrable Structures in Quantum Field Theory and Massive ODE/IM CorrespondenceJun 09 2016Jul 25 2016This review was born as notes for a lecture given at the YRIS school on integrability in Durham, in the summer of 2015. It deals with a beautiful method, developed in the mid-nineties by V.V. Bazhanov, S.L. Lukyanov and A.B. Zamolodchikov and, as such, ... More
Electroweak radiative corrections at high energiesJan 10 2002This PhD thesis is concerned with one-loop virtual electroweak corrections to arbitrary processes in the high-energy limit. Complete results are presented for the leading and subleading logarithms of large ratios of energy scales to mass scales. These ... More
Highly rotating fluids with vertical stratification for periodic data and vanishing vertical viscosityNov 29 2016We prove that the primitive equations in the periodic domain, with vanishing vertical viscosity can be approximated as $\varepsilon \to 0$ by mean of a suitable limit system. If the initial data has zero horizontal average this convergence is global in ... More
Regularity of solutions of the isoperimetric problem that are close to a smooth manifoldOct 09 2007Oct 18 2015In this work we consider a question in the calculus of variations motivated by riemannian geometry, the isoperimetric problem. We show that solutions to the isoperimetric problem, close in the flat norm to a smooth submanifold, are themselves smooth and ... More
First law of thermodynamics for dynamical apparent horizons and the entropy of Friedmann universesJun 29 2015Aug 10 2015Recently, we have generalized the Bekenstein-Hawking entropy formula for black holes embedded in expanding Friedmann universes. In this letter, we begin the study of this new formula to obtain the first law of thermodynamics for dynamical apparent horizons. ... More
On the Number of Components of the Symplectic Representatives of the Canonical ClassNov 14 2006In this paper we show that there exists a family of simply connected, symplectic 4-manifolds such that the (Poincare dual of the) canonical class admits both connected and disconnected symplectic representatives. This answers a question raised by Fintushel ... More
Hitting time in regular sets and logarithm law for rapidly mixing dynamical systemsJun 18 2009We prove that if a system has superpolynomial (faster than any power law) decay of correlations (with respect to Lipschitz observables) then the time $\tau (x,S_{r})$ needed for a typical point $x$ to enter for the first time a set $S_{r}=\{x:f(x)\leq ... More
Global existence and convergence for non-dimensionalized incompressible Navier-Stokes equations in low Froude number regimeFeb 24 2017Aug 15 2017We prove that the incompressible, density dependent, Navier-Stokes equations are globally well posed in a low Froude number regime. The density is supposed to be increasing in depth and linearized around a stable state. Moreover if the Froude number tends ... More
Stability of $L^\infty$ solutions for hyperbolic systems with coinciding shocks and rarefactionsJun 13 2000We consider a hyperbolic system of conservation laws u_t + f(u)_x = 0 and u(0,\cdot) = u_0, where each characteristic field is either linearly degenerate or genuinely nonlinear. Under the assumption of coinciding shock and rarefaction curves and the existence ... More
Geodesic currents and length compactness for automorphisms of free groupsFeb 24 2006Dec 05 2007We prove a compactness theorem for automorphisms of free groups. Namely, we show that the set of automorphisms keeping bounded the length of the uniform current is compact (up to conjugation.) This implies that the spectrum of the length of the images ... More
Computing square-free polarized abelian varieties over finite fieldsMay 25 2018Jan 29 2019We give algorithms to compute isomorphism classes of ordinary abelian varieties defined over a finite field $\mathbb{F}_q$ whose characteristic polynomial (of Frobenius) is square-free and of abelian varieties defined over the prime field $\mathbb{F}_p$ ... 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