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Macroscopic Floquet topological crystalline steel pumpJul 17 2017The transport of a steel sphere on top of two dimensional periodic magnetic patterns is studied experimentally. Transport of the sphere is achieved by moving an external permanent magnet on a closed loop around the two dimensional crystal. The transport ... More

Hard topological versus soft geometrical magnetic particle transportJul 10 2019The transport on top of a periodic two-dimensional hexagonal magnetic pattern of (i) a single macroscopic steel sphere, (ii) a doublet of wax/magnetite composite spheres, and (iii) an immiscible mixture of ferrofluid droplets with a perfluorinated liquid ... More

Neutrino Magnetic Moment and Solar Neutrino ExperimentsNov 16 1998We have studied the effect of a non-vanishing neutrino magnetic moment \ ($\mu_{\nu}$) on the $\nu_{\rm x}$ ({x=$e,\mu,\tau$}) elastic scattering off electrons for the Super-Kamiokande detector. The bounds on the $\mu_{\nu}$ we have obtained are comparable ... More

Morphology of galaxies with quiescent recent assembly history in a Lambda-CDM universeMay 22 2014Jun 04 2014The standard disc formation scenario postulates that disc forms as the gas cools and flows into the centre of the dark matter halo, conserving the specific angular momentum. Major mergers have been shown to be able to destroy or highly perturb the disc ... More

Lepton Flavour Violation in Supersymmetric ModelsNov 25 2003We present two recent developments on lepton flavour violation in the MSSM. 1) The supersymmetric seesaw mechanism can be realized through the exchange of heavy SU(2)_W-triplet states, rather than `right-handed' neutrinos. In this scenario the ratio of ... More

The MSW solution to the solar neutrino problem in the presence of random solar matter density perturbationsFeb 23 1996We present the evolution equation describing MSW conversion, derived in the framework of the Schr\"odinger approach, in the presence of matter density fluctuations. Then we analyse the effect of such fluctuations in the MSW scenario as a solution to the ... More

Supersymmetric Seesaw without Singlet Neutrinos: Neutrino Masses and Lepton-Flavour ViolationJul 01 2002Jul 08 2002We consider the supersymmetric seesaw mechanism induced by the exchange of heavy SU(2)_W triplet states, rather than `right-handed' neutrino singlets, to generate neutrino masses. We show that in this scenario the neutrino flavour structure tested at ... More

Solar Radiation Pressure Resonances in Low Earth OrbitsSep 28 2017The aim of this work is to highlight the crucial role that orbital resonances associated with solar radiation pressure can have in Low Earth Orbit. We review the corresponding literature, and provide an analytical tool to estimate the maximum eccentricity ... More

Bright Metal-Poor Stars from the Hamburg/ESO Survey. II. A Chemodynamical AnalysisNov 11 2016We obtain estimates of stellar atmospheric parameters for a previously published sample of 1777 relatively bright (9 < B < 14) metal-poor candidates from the Hamburg/ESO Survey. The original Frebel et al. analysis of these stars was only able to derive ... More

Hilbert Functions of Filtered ModulesOct 11 2007Nov 13 2009In this presentation we shall deal with some aspects of the theory of Hilbert functions of modules over local rings, and we intend to guide the reader along one of the possible routes through the last three decades of progress in this area of dynamic ... More

Minimal free resolution of a finitely generated module over a regular local ringApr 28 2008Nov 05 2009Numerical invariants of a minimal free resolution of a module $M$ over a regular local ring $(R,\n)$ can be studied by taking advantage of the rich literature on the graded case. The key is to fix suitable $\n$-stable filtrations ${\mathbb M} $ of $M ... More

Radio-X-ray Synergy to discover and Study Jetted Tidal Disruption EventsJan 21 2015Observational consequences of tidal disruption of stars (TDEs) by supermassive black holes (SMBHs) can enable us to discover quiescent SMBHs, constrain their mass function, study formation and evolution of transient accretion disks and jet formation. ... More

Analytic Isomorphisms of compressed local algebrasJul 30 2012In this paper we consider Artin local K-algebras with maximal length in the class of Artin algebras with given embedding dimension and socle type. They have been widely studied by several authors, among others by Iarrobino, Fr\"oberg and Laksov. If the ... More

On the Chern number of a filtrationApr 28 2008We study the first Hilbert coefficient (after the multiplicity) $e_1$ of a local ring $(A,\m). $ Under various circumstances, it is also called the {\bf Chern number} of the local ring $A.$ Starting from the work of D.G. Northcott in the 60's, several ... More

Macroscopic Forces driven by Resonant Neutrino ConversionOct 25 1999May 10 2000We show that neutrino oscillations in matter are always accompanied by collective forces on the medium. This effect may produce interesting consequences for the background and the neutrino oscillations themselves. The force is maximal in the case of resonant ... More

High-redshift formation and evolution of central massive objects II: The census of BH seedsJan 18 2012We present results of simulations aimed at tracing the formation of nuclear star clusters (NCs) and black hole (BH) seeds, in a cosmological context. We focus on two mechanisms for the formation of BHs at high redshifts: as end-products of (1) Population ... More

Lepton Flavour Violating Decays of Supersymmetric Higgs BosonsApr 08 2003We compute the lepton flavour violating couplings of Higgs bosons in the Minimal Supersymmetric Standard Model, and show that they can induce the decays (h,H,A) --> mu tau at non-negligible rates, for large tan(beta) and sizeable smuon-stau mixing. We ... More

Anatomy and Phenomenology of mu-tau Lepton Flavour Violation in the MSSMApr 23 2004May 20 2004We perform a detailed analysis of several mu-tau lepton flavour violating (LFV) processes, namely tau --> mu X (X = gamma, e+ e-, mu+ mu-, rho, pi, eta, eta'), Z --> mu tau and Higgs boson decays into mu tau. First we present a model independent operator ... More

Predictive Grand Unified Textures for Quark and Neutrino Masses and MixingsMar 09 2000Nov 27 2000We propose new textures for the fermion Yukawa matrices which are generalizations of the so-called Stech ansatz. We discuss how these textures can be realized in supersymmetric grand unified models with horizontal symmetry SU(3)_H among the fermion generations. ... More

Towards a grand unified picture for neutrino and quark mixingsJul 16 1999The comparison of the CKM mixing angles with the leptonic mixings implied by the recent atmospheric and solar neutrino data exhibits an interesting complementarity. This pattern can be understood in the context of the SU(5) grand unification, assuming ... More

Flavour structure, flavour symmetry and supersymmetryJul 05 2001We discuss the role played by the horizontal flavour symmetry in supersymmetric theories. In particular, we consider the horizontal symmetry $SU(3)_H$ between the three fermion families and show how this concept can help in explaining the fermion mass ... More

Grand unified textures for neutrino and quark mixingsNov 23 1998Dec 23 1998The atmospheric neutrino data imply large mixing between the $\nu_\mu$ and $\nu_\tau$ states, $\theta_{23} = (45\pm 12)^\circ$, while the MSW solution to the solar neutrino problem needs very small mixing angle $\theta_{12} = (2\pm 1)^\circ$. In the quark ... More

Limits on the Non-Standard Interactions of Neutrinos from $e^+ e^-$ CollidersNov 12 2001Apr 17 2002We provide an effective Lagrangian analysis of contact non-standard interactions of neutrinos with electrons, which can be effectively mediated by extra particles, and examine the associated experimental limits. At present, such interactions are strongly ... More

Flavour non-conservation in goldstino interactionsJun 03 2000Aug 28 2000We point out that the interactions of goldstinos with matter supermultiplets are a potential source of flavour violation, if fermion and sfermion mass matrices are not aligned and supersymmetry is spontaneously broken at a low scale. We study the impact ... More

Galaxy pairs in cosmological simulations: effects of interactions on colours and chemical abundancesMay 04 2006We perform an statistical analysis of galaxies in pairs in a Lambda-CDM scenario by using the chemical GADGET-2 of Scannapieco et al. (2005) in order to study the effects of galaxy interactions on colours and metallicities. We find that galaxy-galaxy ... More

Bright Metal-Poor Stars from the Hamburg/ESO Survey. II. A Chemodynamical AnalysisNov 11 2016Nov 15 2016We obtain estimates of stellar atmospheric parameters for a previously published sample of 1777 relatively bright (9 < B < 14) metal-poor candidates from the Hamburg/ESO Survey. The original Frebel et al. analysis of these stars was only able to derive ... More

Afterglow lightcurves, viewing angle and the jet structure of gamma-ray burstsDec 04 2001May 09 2002Gamma ray bursts are often modelled as jet-like outflows directed towards the observer; the cone angle of the jet is then commonly inferred from the time at which there is a steepening in the power-law decay of the afterglow. We consider an alternative ... More

Asymptotic scaling from strong coupling in 2-d lattice chiral modelsDec 23 1994Two dimensional $N=\infty$ lattice chiral models are investigate by a strong coupling analysis. Strong coupling expansion turns out to be predictive for the evaluation of continuum physical quantities, to the point of showing asymptotic scaling (within ... More

On the Hilbert function of one-dimensional local complete intersectionsMay 24 2012The Hilbert function of standard graded algebras are well understood by Macaulay's theorem and very little is known in the local case, even if we assume that the local ring is a complete intersection. An extension to the power series ring $R$ of the theory ... More

Bose Einstein Condensation in solid 4HeMar 17 2005We have computed the one--body density matrix rho_1 in solid 4He at T=0 K using the Shadow Wave Function (SWF) variational technique. The accuracy of the SWF has been tested with an exact projector method. We find that off-diagonal long range order is ... More

Topological susceptibility and string tension in the lattice CP(N) modelsJul 31 1992In the lattice CP(N) models we studied the problems related to the measure of the topological susceptibility and the string tension . We perfomed numerical simulations at N=4 and N=10. In order to test the universality, we adopted two different lattice ... More

Strong coupling expansion of chiral modelsDec 23 1994A general precedure is outlined for an algorithmic implementation of the strong coupling expansion of lattice chiral models on arbitrary lattices. A symbolic character expansion in terms of connected values of group integrals on skeleton diagrams may ... More

On measuring the Galactic dark matter halo with hypervelocity starsJul 12 2018Hypervelocity stars (HVSs) travel from the Galactic Centre to the dark matter halo of the Milky Way, where they are observed with velocities in excess of the Galactic escape speed. Their trajectories make them a unique probe of the still poorly constrained ... More

Strong coupling analysis of the large-N 2-d lattice chiral modelsDec 24 1994Two dimensional large-N chiral models on the square and honeycomb lattices are investigated by a strong coupling analysis. Strong coupling expansion turns out to be predictive for the evaluation of continuum physical quantities, to the point of showing ... More

The redshift distribution of SWIFT Gamma-Ray Bursts: evidence for evolutionJul 27 2006We predict the redshift distribution of long Gamma-Ray Bursts (GRBs) with Monte Carlo simulations. Our improved analysis constrains free parameters with three kinds of observation: (i) the log(N)-log(P) diagram of BATSE bursts; (ii) the peak energy distribution ... More

Large-N phase transition in lattice 2-d principal chiral modelsDec 24 1994We investigate the large-N critical behavior of 2-d lattice chiral models by Monte Carlo simulations of U(N) and SU(N) groups at large N. Numerical results confirm strong coupling analyses, i.e. the existence of a large-N second order phase transition ... More

Study of solid 4He in two dimensions. The issue of zero-point defects and study of confined crystalMar 21 2012Defects are believed to play a fundamental role in the supersolid state of 4He. We report on studies by exact Quantum Monte Carlo (QMC) simulations at zero temperature of the properties of solid 4He in presence of many vacancies, up to 30 in two dimensions ... More

Study of the relationship between the gamma ray bursts and their host galaxiesNov 15 2005May 05 2006Gamma ray bursts (GRBs) belong to the most energetic events in the Universe. Recently, the extragalactic nature of these sources has been confirmed with the discovery of several host galaxies (HGs) and the measurement of their redshifts. To explain the ... More

Gauge and Yukawa mediated supersymmetry breaking in the triplet seesaw scenarioApr 10 2006Sep 28 2006We propose a novel supersymmetric unified scenario of the triplet seesaw mechanism where the exchange of the heavy triplets generates both neutrino masses and soft supersymmetry breaking terms. Our framework is very predictive since it relates neutrino ... More

The host galaxies of long-duration GRBs in a cosmological hierarchical scenarioNov 03 2006Feb 05 2007We developed a Monte Carlo code to generate long-duration gamma ray burst (LGRB) events within cosmological hydrodynamical simulations consistent with the concordance model. As structure is assembled, LGRBs are generated in the substructure that formed ... More

Entanglement and nonclassical properties of hypergraph statesApr 25 2014Aug 07 2014Hypergraph states are multi-qubit states that form a subset of the locally maximally entangleable states and a generalization of the well--established notion of graph states. Mathematically, they can conveniently be described by a hypergraph that indicates ... More

The role of supernova feedback on the origin of the stellar and baryonic Tully-Fisher relationsApr 12 2011In this work, we studied the stellar and baryonic Tully-Fisher relations by using hydrodynamical simulations in a cosmological framework. We found that supernova feedback plays an important role on shaping the stellar Tully-Fisher relation causing a steepening ... More

Just-So Oscillation: as Just as MSW?Jul 24 1995The neutrino long wavelength (just-so) oscillation is reconsidered as a solution to the solar neutrino problem. In the light of the presently updated results of the four solar neutrino experiments, the data fit in the just-so scenario substantially improves ... More

Phenomenology of the triplet seesaw mechanism with Gauge and Yukawa mediation of SUSY breakingJul 26 2006Dec 12 2006We thoroughly discuss a new supersymmetric grand unified scenario of the triplet seesaw mechanism where the exchange of heavy SU(2)_W triplet states generates both neutrino masses and soft supersymmetry breaking terms. This framework, recently proposed ... More

Majoron Decay in MatterJul 11 1994It is well known that the matter can significantly alter the picture of neutrino oscillation \cite{W} or neutrino decay \cite{BV}. Here we show that the presence of dense matter induces also the decay of {\it massless} majoron, a Goldstone boson associated ... More

Matter Induced Neutrino Decay: New Candidate for the Solution to the Solar Neutrino ProblrmJun 16 1993Effects of the dense matter can induce the neutrino decay even if neutrinos are stable in vacuum. This is due to coherent interactions with matter which lead to energy level-splitting between the neutrino and antineutrino states and thereby provide available ... More

Lepton flavour violation in the supersymmetric type-II seesaw mechanismSep 17 2008We summarize the predictions for the radiative decays l_j->l_i \gamma within the context of the supersymmetric type II seesaw mechanism considering universal boundary conditions for the soft SUSY breaking terms. The dependence on the low-energy neutrino ... More

Relating seesaw neutrino masses, lepton flavor violation and SUSY breakingSep 29 2006We discuss a GUT realization of the supersymmetric triplet seesaw mechanism(recently proposed by us in hep-ph/0604083 and further analyzed in hep-ph/0607298) where the exchange of the heavy triplet states generates both neutrino masses and soft SUSY breaking ... More

Studies of Transverse Momentum Dependent Parton Distributions and Bessel WeightingSep 01 2014Feb 27 2015In this paper we present a new technique for analysis of transverse momentum dependent parton distribution functions, based on the Bessel weighting formalism. The procedure is applied to studies of the double longitudinal spin asymmetry in semi-inclusive ... More

Fingerprints of the hierarchical building up of the structure on the gas kinematics of galaxiesSep 04 2012Recent observational and theoretical works have suggested that the Tully-Fisher Relation might be generalised to include dispersion-dominated systems by combining the rotation and dispersion velocity in the definition of the kinematical indicator. Mergers ... More

Supernova Feedback and the Bend of the Tully-Fisher RelationJan 12 2011We have studied the origin of the Tully-Fisher relation by analysing hydrodynamical simulations in a Lambda-CDM universe. We found that smaller galaxies exhibit lower stellar masses than those predicted by the linear fit to high mass galaxies (fast rotators), ... More

Impact of Supernova feedback on the Tully-Fisher relationMay 26 2010Jun 01 2010Recent observational results found a bend in the Tully-Fisher Relation in such a way that low mass systems lay below the linear relation described by more massive galaxies. We intend to investigate the origin of the observed features in the stellar and ... More

Clues for the origin of the fundamental metallicity relations. I: The hierarchical building up of the structureSep 08 2006Oct 05 2006We analyse the evolutionary history of galaxies formed in a hierarchical scenario consistent with the concordance $\Lambda$-CDM model focusing on the study of the relation between their chemical and dynamical properties. Our simulations consistently describe ... More

Fingerprints of the Hierarchical Building up of the Structure on the Mass-Metallicity RelationAug 31 2005We study the mass-metallicity relation of galactic systems with stellar masses larger than 10^9 Mo in Lambda-CDM scenarios by using chemical hydrodynamical simulations. We find that this relation arises naturally as a consequence of the formation of the ... More

High-precision estimates of critical quantities by means of improved HamiltoniansDec 14 2000Three-dimensional spin models of the Ising and XY universality classes are studied by a combination of high-temperature expansions and Monte Carlo simulations applied to improved Hamiltonians. The critical exponents and the critical equation of state ... More

Critical exponents and equation of state of three-dimensional spin modelsOct 25 2000Three-dimensional spin models of the Ising and XY universality classes are studied by a combination of high-temperature expansions and Monte Carlo simulations. Critical exponents are determined to very high precision. Scaling amplitude ratios are computed ... More

Zero-point vacancies in quantum solidsJun 13 2008A Jastrow wave function (JWF) and a shadow wave function (SWF) describe a quantum solid with Bose--Einstein condensate; i.e. a supersolid. It is known that both JWF and SWF describe a quantum solid with also a finite equilibrium concentration of vacancies ... More

Ab-initio low-energy dynamics of superfluid and solid 4HeMay 27 2009Nov 04 2010We have extracted information about real time dynamics of 4He systems from noisy imaginary time correlation functions f(tau) computed via Quantum Monte Carlo (QMC): production and falsification of model spectral functions s(omega) are obtained via a survival-to-compatibility ... More

Zero-temperature study of vacancies in solid 4HeJun 13 2008We are investigating the properties of vacancies in solid 4He with the exact zero temperature SPIGS method. Our aim is to study the possibility of phase--separation between vacancies and the perfect crystal. We find a significant correlation among vacancies ... More

Quantum dislocations: the fate of multiple vacancies in two dimensional solid 4HeJul 21 2009Mar 18 2010Defects are believed to play a fundamental role in the supersolid state of 4He. We have studied solid 4He in two dimensions (2D) as function of the number of vacancies n_v, up to 30, inserted in the initial configuration at rho = 0.0765 A^-2, close to ... More

Exact ground state Monte Carlo method for Bosons without importance samplingJul 27 2009Oct 20 2009Generally ``exact'' Quantum Monte Carlo computations for the ground state of many Bosons make use of importance sampling. The importance sampling is based, either on a guiding function or on an initial variational wave function. Here we investigate the ... More

Emission lines in GRBs constrain the total energy reservoirMay 15 2002The emission features observed in the X-ray afterglow of Gamma Ray Bursts are extremely powerful. Since they last at least for several hours, they imply energies of the order of 1e49 ergs. This in turn implies that the energy contained in the illuminating ... More

Critical exponents and equation of state of the three-dimensional Heisenberg universality classOct 17 2001Jan 17 2002We improve the theoretical estimates of the critical exponents for the three-dimensional Heisenberg universality class. We find gamma=1.3960(9), nu=0.7112(5), eta=0.0375(5), alpha=-0.1336(15), beta=0.3689(3), and delta=4.783(3). We consider an improved ... More

Boundaries on Neutrino Mass from Supernovae Neutronization Burst by Liquid Argon ExperimentsJan 02 2015This work presents an upper bound on the neutrino mass using the emission of $\nu_e$ from the neutronization burst of a core collapsing supernova at 10~kpc of distance and a progenitor star of 15~M$_\odot$. The calculations were done considering a 34 ... More

Impurity-induced bound states in superconductors with spin-orbit couplingOct 16 2014Apr 01 2015We study the effect of strong spin-orbit coupling (SOC) on bound states induced by impurities in superconductors. The presence of spin-orbit coupling breaks the $\mathbb{SU}(2)$-spin symmetry and causes the superconducting order parameter to have generically ... More

Giant Spin-Orbit Torque in Graphene-Topological-Insulator HeterostructuresOct 13 2016The control of a ferromagnet's magnetization via only electric currents requires the efficient generation of current-driven spin-torques. In magnetic structures based on topological insulators (TIs) current-induced spin-orbit torques can be generated. ... More

Four-point renormalized coupling constant in O(N) modelsSep 05 1995The renormalized zero-momentum four-point coupling $g_r$ of $O(N)$-invariant scalar field theories in $d$ dimensions is studied by applying the $1/N$ expansion and strong coupling analysis. The $O(1/N)$ correction to the $\beta$-function and to the fixed ... More

Impurity-induced states in superconducting heterostructuresNov 11 2017Nov 29 2017Heterostructures allow the realization of electronic states that are difficult to obtain in isolated systems. Exemplary is the case of quasi-one-dimensional heterostructures formed by a superconductor and a semiconductor with spin-orbit coupling in which ... More

Gaia DR2 in 6D: Searching for the fastest stars in the GalaxyApr 27 2018Sep 19 2018We search for the fastest stars in the subset of stars with radial velocity measurements of the second data release (DR2) of the European Space Agency mission Gaia. Starting from the observed positions, parallaxes, proper motions, and radial velocities, ... More

(n-1)-st Koszul homology and the structure of monomial idealsNov 06 2008Koszul homology of monomial ideals provides a description of the structure of such ideals, not only from a homological point of view (free resolutions, Betti numbers, Hilbert series) but also from an algebraic viewpoint. In this paper we show that, in ... More

Magnetic force sensing using a self-assembled nanowireOct 25 2018We present a scanning magnetic force sensor based on an individual magnet-tipped GaAs nanowire (NW) grown by molecular beam epitaxy. Its magnetic tip consists of a final segment of single-crystal MnAs formed by sequential crystallization of the liquid ... More

Transient Rayleigh-Benard-Marangoni Convection due to Evaporation : a Linear Non-normal Stability AnalysisNov 11 2009The convective instability in a plane liquid layer with time-dependent temperature profile is investigated by means of a general method suitable for linear stability analysis of an unsteady basic flow. The method is based on a non-normal approach, and ... More

Probing Non-Standard Couplings of Neutrinos at the Borexino DetectorNov 12 2001Mar 27 2002The present experimental status does not exclude weak-strength non-standard interactions of neutrinos with electrons. These interactions can be revealed in solar neutrino experiments. Our discussion covers several aspects related to this issue. First, ... More

Beyond the standard seesaw: neutrino masses from Kahler operators and broken supersymmetryJul 12 2010Aug 06 2010We investigate supersymmetric scenarios in which neutrino masses are generated by effective d=6 operators in the Kahler potential, rather than by the standard d=5 superpotential operator. First, we discuss some general features of such effective operators, ... More

A common source for neutrino and sparticle massesOct 05 2010We discuss supersymmetric scenarios in which neutrino masses arise from effective d=6 operators in the Kahler potential (including SUSY-breaking insertions). Simple explicit realizations of those Kahler operators are presented in the context of the type ... More

Topological superconductivity in a multichannel Yu-Shiba-Rusinov chainMay 21 2015Nov 11 2015Chains of magnetic atoms placed on the surface of an s-wave superconductor with large spin-orbit coupling provide a promising platform for the realization of topological superconducting states characterized by the presence of Majorana zero-energy modes. ... More

Properties of X-Ray Rich Gamma Ray Bursts and X-Ray Flashes detected with BeppoSAX and Hete-2Nov 09 2005Aug 08 2006We study the spectrum of the prompt emission and the X-ray and optical afterglow fluxes of 54 X-Ray Rich Gamma Ray Burst (XRRs) and X-Ray Flashes (XRFs), observed by BeppoSax and HETE-2. A comparison is then performed with classical Gamma Ray Bursts (GRBs). ... More

Quantized vortices in two dimensional solid 4HeNov 08 2011Diagonal and off-diagonal properties of 2D solid 4He systems doped with a quantized vortex have been investigated via the Shadow Path Integral Ground State method using the fixed-phase approach. The chosen approximate phase induces the standard Onsager-Feynman ... More

On the evaluation of universal non-perturbative constants in O(N) sigma modelsFeb 10 1997We investigate the relation between on-shell and zero-momentum non-perturbative quantities entering the parametrization of the two-point Green's function of two-dimensional non-linear O(N) sigma models. We present accurate estimates of ratios of mass-scales ... More

The two-point correlation function of three-dimensional O(N) models: critical limit and anisotropyMay 09 1997In three-dimensional O(N) models, we investigate the low-momentum behavior of the two-point Green's function G(x) in the critical region of the symmetric phase. We consider physical systems whose criticality is characterized by a rotational-invariant ... More

General conditions for proximity-induced odd-frequency superconductivity in two-dimensional electronic systemsDec 09 2015Jul 07 2016We obtain the general conditions for the emergence of odd-frequency superconducting pairing in a two-dimensional (2D) electronic system proximity-coupled to a superconductor, making minimal assumptions about both the 2D system and the superconductor. ... More

Four-point renormalized coupling constant in O(N) modelsJun 01 1995The renormalized zero-momentum four-point coupling $g_r$ of O(N)-invariant scalar field theories in $d$ dimensions is studied by applying the 1/N expansion and strong coupling analysis. The O(1/N) correction to the $\beta$-function and to the fixed point ... More

Cladistics of Double Yangians and Elliptic AlgebrasJun 28 1999Dec 17 1999A self-contained description of algebraic structures, obtained by combinations of various limit procedures applied to vertex and face sl(2) elliptic quantum affine algebras, is given. New double Yangians structures of dynamical type are in particular ... More

The Raman coupling function in amorphous silica and the nature of the long wavelength excitations in disordered systemsNov 16 1999New Raman and incoherent neutron scattering data at various temperatures and molecular dynamic simulations in amorphous silica, are compared to obtain the Raman coupling coefficient $C(\omega)$ and, in particular, its low frequency limit. This study indicates ... More

On the Quasi-Hopf structure of deformed double YangiansJan 06 2000We construct universal twists connecting the centrally extended double Yangian DY(sl(2))_c with deformed double Yangians DY_r(sl(2))_c, thereby establishing the quasi-Hopf structures of the latter.

Physical Investigation of the Potentially Hazardous Asteroid (144898) 2004 VD17Jun 08 2007In this paper we present the observational campaign carried out at ESO NTT and VLT in April and May 2006 to investigate the nature and the structure of the Near Earth Object (144898) 2004 VD17. In spite of a great quantity of dynamical information, according ... More

Network Classification and CategorizationSep 13 2017To the best of our knowledge, this paper presents the first large-scale study that tests whether network categories (e.g., social networks vs. web graphs) are distinguishable from one another (using both categories of real-world networks and synthetic ... More

Gate-based single-shot readout of spins in siliconSep 06 2018Oct 02 2018Electron spins in silicon quantum dots provide a promising route towards realising the large number of coupled qubits required for a useful quantum processor. At present, the requisite single-shot spin qubit measurements are performed using on-chip charge ... More

Predicting Graph Categories from Structural PropertiesMay 07 2018Complex networks are often categorized according to the underlying phenomena that they represent such as molecular interactions, re-tweets, and brain activity. In this work, we investigate the problem of predicting the category (domain) of arbitrary networks. ... More

GRB 141221A: gone is the windFeb 29 2016GRB 141221A was observed from infrared to soft gamma-ray bands. Here, we investigate its properties, in light of the standard model. We find that the optical light curve of the afterglow of this burst presents an unusual steep/quick rise. The broad band ... More

Bright Metal-Poor Stars from the Hamburg/ESO Survey. I. Selection and Follow-up Observations from 329 FieldsAug 16 2006We present a sample of 1777 bright (9<B<14) metal-poor candidates selected from the Hamburg/ESO Survey (HES). Despite saturation effects present in the red portion of the HES objective-prism spectra, the data were recoverable and quantitative selection ... More

Polarization resolved Cu $L_3$-edge resonant inelastic x-ray scattering of orbital and spin excitations in NdBa$_{2}$Cu$_{3}$O$_{7-δ}$Feb 14 2019High resolution resonant inelastic x-ray scattering (RIXS) has proven particularly effective in the determination of crystal field and spin excitations in cuprates. Its strength lies in the large Cu $L_{3}$ resonance and in the fact that the scattering ... More

Chiral superfluid states in hybrid graphene heterostructuresJul 05 2012Aug 29 2013The use of high quality hexagonal boron nitride (hBN) as a dielectric material has made possible the realization of graphene devices with very high mobility. In addition hBN can be made as thin as few atomic layers and, as recently demonstrated experimentally, ... More

Master Wilson loop operators in large-N lattice QCD$_2$Dec 20 1994An explicit solution is found for the most general independent correlation functions in lattice QCD$_2$ with Wilson action. The large-$N$ limit of these correlations may be used to reconstruct the eigenvalue distributions of Wilson loop operators for ... More

Screening and collective modes in gapped bilayer grapheneMay 23 2012Oct 22 2012We study the static and dynamic screening of gapped bilayer graphene. Unlike previous works we use the 4-band model instead of the simplified 2-band model. We find that there are important qualitative differences between the dielectric screening function ... More

Conceptual design of 20 T dipoles for high-energy LHCAug 08 2011Availability of 20 T operational field dipole magnets would open the way for a 16.5 TeV beam energy accelerator in the LHC tunnel. Here we discuss the main issues related to the magnet design of this extremely challenging dipole: main constraints, superconductor ... More

Analysis of variability in the burst oscillations of the accreting millisecond pulsar XTE J1814-338Aug 04 2005The accreting millisecond pulsar XTE J1814-338 exhibits oscillations at the known spin frequency during Type I X-ray bursts. The properties of the burst oscillations reflect the nature of the thermal asymmetry on the stellar surface. We present an analysis ... More

SZ Science with an ALMA Band 1 Receiver SystemFeb 09 2010Dec 01 2010We present the first full interferometric simulations of galaxy clusters containing radio plasma bubbles as observed by the proposed band 1 receiver system for the ALMA telescope. We discuss the observational requirements for detecting intracluster substructure ... More

Linear response of one-dimensional liquid $^4$He to external perturbationsJul 18 2016We study the response of one-dimensional liquid $^4$He to weak perturbations relying on the dynamical structure factor, $S(q,\omega)$, recently obtained via ab-initio techniques [Phys. Rev. Lett. 116, 135302 (2016)]. We evaluate the drag force, $F_v$, ... More

Dynamical structure factor of one-dimensional hard rodsAug 27 2016The zero-temperature dynamical structure factor $S(q,\omega)$ of one-dimensional hard rods is computed using state-of-the-art quantum Monte Carlo and analytic continuation techniques, complemented by a Bethe Ansatz analysis. As the density increases, ... More