Results for "V. C. Antochi"

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Carbon nanotubes as target for directional detection of light WIMPJul 09 2017In this paper I will briefly introduce the idea of using Carbon Nanotubes (CNT) as target for the detection of low mass WIMPs with the additional information of directionality. I will also present the experimental efforts of developing a Time Projection ... More
Combined readout of a triple-GEM detectorMar 19 2018Optical readout of GEM based devices by means of high granularity and low noise CMOS sensors allows to obtain very interesting tracking performance. Space resolution of the order of tens of $\mu$m were measured on the GEM plane along with an energy resolution ... More
The XENON1T Data Acquisition SystemJun 03 2019The XENON1T liquid xenon time projection chamber is the most sensitive detector built to date for the measurement of direct interactions of weakly interacting massive particles with normal matter. The data acquisition system (DAQ) is constructed from ... More
First results on the scalar WIMP-pion coupling, using the XENON1T experimentNov 29 2018We present first results on the scalar WIMP-pion coupling from 1 t$\times$yr of exposure with the XENON1T experiment. This interaction is generated when the WIMP couples to a virtual pion exchanged between the nucleons in a nucleus. In contrast to most ... More
Constraining the spin-dependent WIMP-nucleon cross sections with XENON1TFeb 08 2019We report the first experimental results on spin-dependent elastic WIMP-nucleon scattering from the XENON1T dark matter search experiment. The analysis uses the full tonne-year exposure of XENON1T to constrain the spin-dependent proton-only and neutron-only ... More
XENON1T Dark Matter Data Analysis: Signal \& Background Models, and Statistical InferenceFeb 28 2019The XENON1T experiment searches for dark matter particles through their scattering off xenon atoms in a 2 tonne liquid xenon target. The detector is a dual-phase time projection chamber, which measures simultaneously the scintillation and ionization signals ... More
XENON1T Dark Matter Data Analysis: Signal & Background Models, and Statistical InferenceFeb 28 2019Mar 01 2019The XENON1T experiment searches for dark matter particles through their scattering off xenon atoms in a 2 tonne liquid xenon target. The detector is a dual-phase time projection chamber, which measures simultaneously the scintillation and ionization signals ... More
First results on the scalar WIMP-pion coupling, using the XENON1T experimentNov 29 2018Feb 22 2019We present first results on the scalar WIMP-pion coupling from 1 t$\times$yr of exposure with the XENON1T experiment. This interaction is generated when the WIMP couples to a virtual pion exchanged between the nucleons in a nucleus. In contrast to most ... More
XENON1T Dark Matter Data Analysis: Signal Reconstruction, Calibration and Event SelectionJun 11 2019The XENON1T experiment at the Laboratori Nazionali del Gran Sasso is the most sensitive direct detection experiment for dark matter in the form of weakly interacting particles (WIMPs) with masses above $6\,$GeV/$c^2$ scattering off nuclei. The detector ... More
Constraining the Spin-Dependent WIMP-Nucleon Cross Sections with XENON1TFeb 08 2019Apr 30 2019We report the first experimental results on spin-dependent elastic weakly interacting massive particle (WIMP) nucleon scattering from the XENON1T dark matter search experiment. The analysis uses the full ton year exposure of XENON1T to constrain the spin-dependent ... More
The XENON1T Data Acquisition SystemJun 03 2019Aug 07 2019The XENON1T liquid xenon time projection chamber is the most sensitive detector built to date for the measurement of direct interactions of weakly interacting massive particles with normal matter. The data acquisition system (DAQ) is constructed from ... More
A Search for Light Dark Matter Interactions Enhanced by the Migdal effect or Bremsstrahlung in XENON1TJul 30 2019Direct dark matter detection experiments based on a liquid xenon target are leading the search for dark matter particles with masses above $\sim$5 GeV/c$^2$, but have limited sensitivity to lighter masses because of the small momentum transfer in dark ... More
Light Dark Matter Search with Ionization Signals in XENON1TJul 26 2019We report constraints on light dark matter (DM) models using ionization signals in the XENON1T experiment. We mitigate backgrounds with strong event selections, rather than requiring a scintillation signal, leaving an effective exposure of $(22 \pm 3)$ ... More
First observation of two-neutrino double electron capture in $^{124}$Xe with XENON1TApr 24 2019Two-neutrino double electron capture ($2\nu$ECEC) is a second-order Weak process with predicted half-lives that surpass the age of the Universe by many orders of magnitude. Until now, indications for $2\nu$ECEC decays have only been seen for two isotopes, ... More
Ground state of antiferromagnetic ordering in fullerene $C_{60}$ moleculeJan 15 2001Theoretical study of mutual orientation of fullerene $C_{60}$ molecule atom spins is presented in this work. Spin-spin interaction was described by Habbard's model. Existence of antiferromagnetic sturcture of spin sub-system in ground state is found.
The fingerprints of Photoionization and Shock-Ionization in two CSS sourcesOct 23 2015We investigate the ionization state of the Extended Emission-Line Regions (EELRs) around two compact steep-spectrum (CSS) radio galaxies, 3C~268.3 and 3C~303.1, in order to identify the contribution of photoionization and shock-ionization. We perform ... More
Self-generated electronic heterogeneity and quantum glassiness in the high temperature superconductorsOct 05 2004We present a systematic study of the spin and charge dynamics of copper oxide superconductors as a function of carrier concentration $x$. Our results portray a coherent physical picture, which reveals a quantum critical point at optimum doping ($x=x_{opt}$), ... More
Polysulfanes on interstellar grains as a possible reservoir of interstellar sulphurJul 23 2012The form of depleted sulphur in dense clouds is still unknown. Until now, only two molecules, OCS and SO2, have been detected in interstellar ices but cannot account for the elemental abundance of sulphur observed in diffuse medium. Chemical models suggest ... More
The Aharonov-Bohm phase is locally generated (like all other quantum phases)Jun 08 2019Aharonov and Bohm noted that the wave-function of a charge acquires a detectable phase when superposed along two paths enclosing an infinite solenoid, even though that wave-function is non-zero exclusively where the solenoid's electric and magnetic fields ... More
Lorentzian worldlines and Schwarzian derivativeSep 11 1998We relate in this note the classical Schwarzian derivative to the curvature of time-like curves in Lorentz surfaces of constant curvature.
Projectively equivariant quantization and symbol calculus: noncommutative hypergeometric functionsMar 15 2001We extend projectively equivariant quantization and symbol calculus to symbols of pseudo-differential operators. An explicit expression in terms of hypergeometric functions with noncommutative arguments is given. Some examples are worked out, one of them ... More
Space of second order linear differential operators as a module over the Lie algebra of vector fieldsSep 12 1994The space of linear differential operators on a smooth manifold $M$ has a natural one-parameter family of $Diff(M)$ (and $Vect(M)$)-module structures, defined by their action on the space of tensor-densities. It is shown that, in the case of second order ... More
An extension of the Burau representation to a mapping class group associated to Thompson's group TFeb 25 2003We study some aspects of the geometric representation theory of the Thompson and Neretin groups, suggested by their analogies with the diffeomorphism groups of the circle. We prove that the Burau representation of the Artin braid groups extends to a mapping ... More
Are Spiral Disks Really Opaque ?Nov 24 1994We compare the ultra-violet, optical, and far-infrared emission for a sample of 135 spiral galaxies in order to address the widely debated problem concerning the opacity of spiral disks. We find that the re-radiation of the dust, estimated from the far-infrared ... More
H_3^(2+) molecular ion in a strong magnetic field: a triangular configurationJan 12 2000Jan 19 2000The bound state in the system of three protons and an electron (pppe) under a homogeneous strong magnetic field where the protons are situated in the vertices of an equilateral triangle perpendicular to the magnetic field lines is found. It is shown that ... More
Supercurrent and multiple singlet-doublet phase transitions of a quantum dot Josephson junction inside an Aharonov-Bohm ringOct 21 2008Jan 28 2009We study a quantum dot Josephson junction inside an Aharonov-Bohm environment. The geometry is modeled by an Anderson impurity coupled to two directly-linked BCS leads. We illustrate that the well-established picture of the low-energy physics being governed ... More
Searching for evidence of jet-cloud interaction in radio galaxies. First results for 3C 381Jan 10 2013We present results of Gemini spectroscopy and Hubble Space Telescope imaging of the 3C~381 radio galaxy. Possible ionising mechanisms for the Extended Emission-Line Region were studied through state-of-the-art diagnostic analysis employing line-ratios. ... More
A search for water masers toward extrasolar planetsFeb 17 2006Water is the most common triatomic molecule in the universe and the basis of life on Earth. Astrophysical masers have been widely studied in recent years and have been shown to be invaluable probes of the details of the environment in which they are found. ... More
"Stokes' Second Problem in High Frequency Limit. Application to Micro (Nano)- ResonatorsSep 25 2006Mar 26 2007Using kinetic equation in the relaxation approximation (RTA), we investigate a flow generated by an infinite plate oscillating with frequency $\omega$. Geometrical simplicity of the problem allows a solution in the entire range of dimensionless frequency ... More
Dilepton Production at SPS-energy Heavy Ion CollisionsJun 14 1996The production of dileptons is studied within a hadronic transport model. We investigate the sensitivity of the dilepton spectra to the initial configuration of the hadronic phase in a ultrarelativistic heavy ion collision. Possible in medium correction ... More
On free resolutions in multivariable operator theorySep 17 2001Sep 18 2001We define the notion of a free resolution of a d-tuple $(T_1, T_2, . . . T_d)$ of mutually commuting operators acting on a Hilbert space H, and that this invariant gives rise to a class of vector space complexes parametrized by points in the unit ball ... More
Spectral analysis of YSOs and other emission-line stars in the North America and Pelican nebulae regionNov 23 2009Far red spectra for 34 stars with V magnitudes between 15 and 18 in the direction of the North America and Pelican nebulae (NAP) star-forming region are obtained. Some of these stars were known earlier as emission-line objects, others were suspected as ... More
Some arguments in support of the association of PSR B1706-44 with the supernova remnant G343.1-2.3Nov 22 2001We present some arguments in support of the association of the pulsar PSR B1706-44 with the supernova remnant G343.1-2.3, based on the idea that these objects could be the result of a supernova explosion within a mushroom-like cavity (created by the supernova ... More
PSR B 1706-44 and the SNR G 343.1-2.3 as the remnants of a cavity supernova explosionAug 05 2002The possible association of the supernova remnant (SNR) G 343.1-2.3 with the pulsar PSR B 1706-44 (superposed on the arclike "shell" of the SNR) has been questioned by some authors on the basis of an inconsistency between the implied and measured (scintillation) ... More
Mapping and Embedding of Two Metrics Associated with Dark Matter, Dark Energy, and Ordinary MatterOct 29 2010In this paper we build a mapping between two different metrics and embed them in a flat manifold. One of the metrics represents the ordinary matter, and the other describes the dark matter, the dark energy, and the particle-antiparticle asymmetry. The ... More
Mapping among manifolds 1Feb 18 2008In this paper we have build the modified Hamiltonian formalism for geometric objects like the Jacobi fields and metric tensors. In this approach Jacobi fields and metric tensors are mapped among manifold. As an application, we have mapped a general n-dimensional ... More
Conformal Form of Pseudo-Riemannian Metrics by Normal Coordinate Transformations IIDec 19 2012In this paper, we have reintroduced a new approach to conformal geometry developed and presented in two previous papers, in which we show that all n-dimensional pseudo-Riemannian metrics are conformal to a flat n-dimensional manifold as well as an n-dimensional ... More
Scenarios of domain pattern formation in a reaction-diffusion systemJul 11 1996We performed an extensive numerical study of a two-dimensional reaction-diffusion system of the activator-inhibitor type in which domain patterns can form. We showed that both multidomain and labyrinthine patterns may form spontaneously as a result of ... More
Special complex manifoldsOct 19 1999Nov 05 2001We introduce the notion of a special complex manifold: a complex manifold (M,J) with a flat torsionfree connection \nabla such that (\nabla J) is symmetric. A special symplectic manifold is then defined as a special complex manifold together with a \nabla-parallel ... More
First-Principles Theory of Competing Order Types, Phase Separation, and Phonon Scattering in Thermoelectric Pb-Sb-Ag-Te AlloysMar 07 2008Using a first-principles cluster expansion, we shed light on the solid-state phase diagram and structure of the recently discovered high-performance thermoelectrics, Pb-Ag-Sb-Te alloys. The observed nanoscale inhomogeneities are shown to be coherent precipitates ... More
Manifestations of a spatial variation of fundamental constants on atomic clocks, Oklo, meteorites, and cosmological phenomenaAug 24 2010The remarkable detection of a spatial variation in the fine-structure constant, alpha, from quasar absorption systems must be independently confirmed by complementary searches. In this letter, we discuss how terrestrial measurements of time-variation ... More
Astronomical and laboratory searches for space-time variation of fundamental constantsSep 20 2010We review recent activity searching for variations in the fundamental constants of nature in quasar absorption spectra and in the laboratory. While research in this direction has been ongoing for many decades, the topic has recently been stimulated by ... More
Time reversal violating Magnetic Quadrupole Moment in heavy deformed nucleiOct 05 2018Dec 10 2018The existence of permanent electric dipole moments (EDMs) and magnetic quadrupole moments (MQMs) violate both time reversal invariance ($T$) and parity ($P$). Following the $CPT$ theorem they also violate combined $CP$ symmetry. Nuclear EDM are completely ... More
Analysis of Boundary Conditions for Crystal Defect Atomistic SimulationsJun 22 2013May 23 2016Numerical simulations of crystal defects are necessarily restricted to finite computational domains, supplying artificial boundary conditions that emulate the effect of embedding the defect in an effectively infinite crystalline environment. This work ... More
Minimal chordal sense of direction and circulant graphsMar 03 2005A sense of direction is an edge labeling on graphs that follows a globally consistent scheme and is known to considerably reduce the complexity of several distributed problems. In this paper, we study a particular instance of sense of direction, called ... More
Electron State Entanglement at Double IonizationMay 07 2001Dec 02 2001Electron wave function entanglement and spin reconfiguration as source of electron correlation are investigated. Properties of correlation function are shown to have the best concordance with experimental data under supposition that probability of change ... More
Mapping Among Manifolds IIMar 07 2008Mar 08 2008In a previous paper we built a modified Hamiltonian formalism to make possible explicit maps among manifolds. In this paper the modified formalism was generalized. As an application, we have built maps among spaces associated to spinors, as well as maps ... More
Physical Principles Based on Geometric PropertiesJun 22 2010Jun 23 2010In this paper we present some results obtained in a previous paper about the Cartan's approach to Riemannian normal coordinates and our conformal transformations among pseudo-Riemannian manifolds. We also review the classical and the quantum angular momenta ... More
Exact Solutions of Einstein EquationsJan 02 2001We use a metric of the type Friedmann-Robertson-Walker to obtain new exact solutions of Einstein equations for a scalar and massive field. The solutions have a permanent or transitory inflationary behavior.
On a classical correspondence between K3 surfaces IIIMay 14 2006Let $X$ be a K3 surface, and $H$ its primitive polarization of the degree $H^2=8$. The moduli space of sheaves over $X$ with the isotropic Mukai vector $(2,H,2)$ is again a K3 surface, $Y$. In math.AG/0206158 we gave necessary and sufficient conditions ... More
The combinatorics of resource sharingSep 23 2003We discuss general models of resource-sharing computations, with emphasis on the combinatorial structures and concepts that underlie the various deadlock models that have been proposed, the design of algorithms and deadlock-handling policies, and concurrency ... More
Control over adversarial packet-dropping communication networks revisitedMar 22 2014We revisit a one-step control problem over an adversarial packet-dropping link. The link is modeled as a set of binary channels controlled by a strategic jammer whose intention is to wage a `denial of service' attack on the plant by choosing a most damaging ... More
Caustics of $1/r^n$ binary gravitational lenses: from galactic haloes to exotic matterNov 25 2015Mar 07 2016We investigate the caustic topologies for binary gravitational lenses made up of two objects whose gravitational potential declines as $1/r^n$. With $n<1$ this corresponds to power-law dust distributions like the singular isothermal sphere. The $n>1$ ... More
Tunneling of a composite particle: Effects of intrinsic structureMay 18 2007Sep 05 2007We consider simple models of tunneling of an object with intrinsic degrees of freedom. This important problem was not extensively studied until now, in spite of numerous applications in various areas of physics and astrophysics. We show possibilities ... More
Magnetic Structure of CaBaCo4O7: Lifting of Geometrical Frustration towards FerrimagnetismFeb 24 2010CaBaCo4O7 represents a new class of ferrimagnets whose structure is built up of CoO4 tetrahedra only, similarly to other members LnBaCo4O7 of the 114 series, forming an alternate stacking of kagome and triangular layers. Neutron powder diffraction reveals, ... More
Spatio temporal characterization of interfacial Faraday waves: A new absorption techniqueMar 10 2005We present measurements of the complete spatio-temporal Fourier spectrum of Faraday waves. The Faraday waves are generated at the interface of two immiscible index matched liquids of different density. By use of a new absorption technique we are able ... More
The use of Geant4 for simulations of a plastic beta-detector and its application to efficiency calibrationJun 05 2008Jun 15 2008Precise beta-branching-ratio measurements are required in order to determine ft-values as a part of our program to test the Electroweak Standard Model via unitarity of the Cabibbo-Kobayashi-Moskawa matrix. For the measurements to be useful in this test, ... More
Approximate Dynamic Programming via a Smoothed Linear ProgramAug 04 2009Oct 03 2009We present a novel linear program for the approximation of the dynamic programming cost-to-go function in high-dimensional stochastic control problems. LP approaches to approximate DP have typically relied on a natural `projection' of a well studied linear ... More
No-horizon theorem for spacetimes with spacelike G1 isometry groupsDec 30 2003We consider four-dimensional spacetimes $(M,{\mathbf g})$ which obey the Einstein equations ${\mathbf G}={\mathbf T}$, and admit a global spacelike $G_{1}={\mathbb R}$ isometry group. By means of dimensional reduction and local analyis on the reduced ... More
Shear-free gravitational collapse is strongly censoredDec 30 2003We consider spherically symmetric spacetimes with matter whose timelike flow is assumed to be shear-free. A number of results on the formation and visibility of spacetime singularities is proven, with the main one being that shear-free collapse cannot ... More
Naked singularities in Tolman-Bondi-de Sitter collapseDec 07 2000We study the formation of central naked singularities in spherical dust collapse with a cosmological constant. We find that the central curvature singularity is locally naked, Tipler strong, and generic, in the sense that it forms from a non-zero-measure ... More
Black hole formation from massive scalar field collapse in the Einstein-de Sitter universeAug 15 2000We study the spherically symmetric collapse of a real, minimally coupled, massive scalar field in an asymptotically Einstein-de Sitter spacetime background. By means of an eikonal approximation for the field and metric functions, we obtain a simple analytical ... More
Thermodynamics and Spectroscopy of Schwarzschild black hole surrounded by QuintessenceJan 11 2013The thermodynamic and spectroscopic behaviour of Schwarzschild black hole surrounded by quintessence are studied. We have derived the thermodynamic quantities and studied their behaviour for different values of quintessence parameter. We put the background ... More
Fluctuator in disordered metallic point contacts: a simulation approachJul 07 1998Electron transport through amorphous monatomic metallic structures generated earlier by molecular dynamics simulations is studied numerically. The interference of electronic trajectories backscattered by the structural disorder probes the multistable ... More
Euler Polynomials and Identities for Non-Commutative OperatorsAug 20 2015Three kinds of identities involving non-commutating operators and Euler and Bernoulli polynomials are studied. The first identity, as given by Bender and Bettencourt, expresses the nested commutator of the Hamiltonian and momentum operators as the commutator ... More
Young Stars in the Camelopardalis Dust and Molecular Clouds. IV. Spectral Observations of the Suspected YSOsSep 13 2008In the first three papers of this series, about 200 objects in Camelopardalis and the nearby areas of Cassiopeia, Perseus and Auriga were suspected of being pre-main-sequence stars in different stages of evolution. To confirm the evolutionary status of ... More
News from the Adriatico Research Conference on "Superconductivity, Andreev Reflection, and Proximity Effect in Mesoscopic Structures"Sep 20 1997Sep 30 1997The Adriatico Research Conference on Superconductivity, Andreev Reflection, and Proximity Effect in Mesoscopic Structures took place at the International Center for Theoretical Physics in Trieste, Italy, July 8-11, 1997. The organizers were Elias Burstein, ... More
Optical-Model Description of Time-Reversal ViolationNov 22 1993A time-reversal-violating spin-correlation coefficient in the total cross section for polarized neutrons incident on a tensor rank-2 polarized target is calculated by assuming a time-reversal-noninvariant, parity-conserving ``five-fold" interaction in ... More
Superconducting Spin QubitsDec 19 2009We propose and theoretically investigate spin superconducting qubits. Spin superconducting qubit consists of a single spin confined in a Josephson junction. We show that owing to spin-orbit interaction, superconducting difference across the junction can ... More
Thermodynamics and Quasinormal modes of Park black hole in Hořava gravityOct 08 2013We study the quasinormal modes of the massless scalar field of Park black hole in the Ho\v{r}ava gravity using the third order WKB approximation method and found that black hole is stable against these perturbation. We compare and discuss the results ... More
Interplay between electron-phonon couplings and disorder strength on the transport properties of organic semiconductorsSep 28 2011The combined effect of bulk and interface electron-phonon couplings on the transport properties is investigated in a model for organic semiconductors gated with polarizable dielectrics. While the bulk electron-phonon interaction affects the behavior of ... More
Bipolaron formation in organic semiconductors at the interface with dielectric gatesApr 23 2012The formation of the electron-phonon induced bipolaron is shown to be feasible in organic semiconductors at the interface with dielectric gates due to the coupling of the carriers with interface vibrational modes and to the weak to intermediate strength ... More
Capacity Regions and Optimal Power Allocation for Groupwise Multiuser DetectionJan 24 2005In this paper, optimal power allocation and capacity regions are derived for GSIC (groupwise successive interference cancellation) systems operating in multipath fading channels, under imperfect channel estimation conditions. It is shown that the impact ... More
Phase transitions and bubble nucleations for a phi^6 model in curved spacetimeFeb 26 2001Condsidering a massive self-interacting phi ^6 scalar field coupled arbitrarily to a (2+1) dimensional Bianchi type-I spacetime, we evaluate the one-loop effective potential. It is found that phi ^6 potential can be regularized in (2+1) dimensional curved ... More
Time-dependent density-functional approach for exciton binding energiesFeb 28 2009Optical processes in insulators and semiconductors, including excitonic effects, can be described in principle exactly using time-dependent density-functional theory (TDDFT). Starting from a linearization of the TDDFT semiconductor Bloch equations in ... More
Late time tails of fields around Schwarzschild black hole surrounded by quintessenceOct 01 2012The evolution of scalar, electromagnetic and gravitational fields around spherically symmetric black hole surrounded by quintessence are studied with special interest on the late-time behavior. In the ring down stage of evolution, we find in the evolution ... More
DVCS amplitude at tree level: Transversality, twist-3, and factorizationOct 25 2000Nov 08 2000We study the virtual Compton amplitude in the generalized Bjorken region (q^2 -> Infinity, t small) in QCD by means of a light-cone expansion of the product of e.m. currents in string operators in coordinate space. Electromagnetic gauge invariance (transversality) ... More
Mixed quark-gluon condensate from instantonsJul 04 1996We calculate the vacuum expectation value of the dimension-5 "mixed" quark-gluon operator, $O_\sigma = \bar\psi (\lambda^a /2) \sigma_{\mu\nu} \psi F_{\mu\nu}^a$, in the instanton vacuum. Within the $1/N_c$--expansion the QCD operator is replaced by an ... More
Pion Nucleon Scattering: Some Results from Lattice QCDSep 18 2013Including the meson-baryon (5 quark) intermediate states in a lattice simulation is challenging. However, it is important in order to obtain the correct energy eigenstates and to relate them to scattering phase shifts. Recent results for the negative ... More
Shared Information in Stationary States at CriticalityDec 15 2009Feb 25 2010We consider bipartitions of one-dimensional extended systems whose probability distribution functions describe stationary states of stochastic models. We define estimators of the shared information between the two subsystems. If the correlation length ... More
Valence bond ground states in quantum antiferromagnets and quadratic algebrasApr 04 2000The wave functions corresponding to the zero energy eigenvalue of a one-dimensional quantum chain Hamiltonian can be written in a simple way using quadratic algebras. Hamiltonians describing stochastic processes have stationary states given by such wave ... More
Photovoltaic effect in bent quantum wiresJul 29 2005We propose a scheme for the generation of photocurrent in bent quantum wires. We calculate the current using a generalized Landauer-Buttiker approach that takes into account the electromagnetic radiation. For circularly polarized light, we find that the ... More
Dirac oscillator with nonzero minimal uncertainty in positionDec 15 2004In the context of some deformed canonical commutation relations leading to isotropic nonzero minimal uncertainties in the position coordinates, a Dirac equation is exactly solved for the first time, namely that corresponding to the Dirac oscillator. Supersymmetric ... More
More on a SUSYQM approach to the harmonic oscillator with nonzero minimal uncertainties in position and/or momentumDec 10 2003Jun 21 2004We continue our previous application of supersymmetric quantum mechanical methods to eigenvalue problems in the context of some deformed canonical commutation relations leading to nonzero minimal uncertainties in position and/or momentum. Here we determine ... More
Soft-wall induced structure and dynamics of partially confined supercritical fluidsMar 18 2019The interplay between the structure and dynamics of partially confined Lennard Jones (LJ) fluids, deep into the supercritical phase, is studied over a wide range of densities in the context of the Frenkel line (FL), which separates rigid liquidlike and ... More
Effect of resonance decays on hadron elliptic flowsFeb 04 2004Oct 05 2004The influence of resonance decays on the elliptic flows of stable hadrons is studied in the quark coalescence model. Although difference between the elliptic flow of pions from resonance decays, except the rho meson, and that of directly produced pions ... More
Effect of space-momentum correlations on the constituent quark number scaling of hadron elliptic flowsMay 22 2005Nov 18 2005Using models ranging from schematic one with a simple quark distribution to more realistic blast wave, we study the elliptic flow of hadrons produced from coalescence of quarks and antiquarks in the quark-gluon plasma that is formed in ultrarelativistic ... More
Delay of Disorder by Diluted PolymersNov 19 2005We study the effect of diluted flexible polymers on a disordered capillary wave state. The waves are generated at an interface of a dyed water sugar solution and a low viscous silicon oil. This allows for a quantitative measurement of the spatio-temporal ... More
Topological Electropoles in 4+1 Dimensional EYMCS TheoryMar 15 1994Apr 06 1994A class of explicit exact solutions of Einstein Yang Mills Chern Simons (EYMCS) theory corresponding to topological solitons carrying non-Abelian topological electric charge is obtained. This verifies a conjecture made in Ref.[1,2] regarding the stabilization ... More
Quantum cosmology of quadratic f(R) theories with a FRW metricJun 14 2017Jun 20 2017We study the quantum cosmology of a quadratic $f(R)$ theory with a FRW metric, via one of its equivalent Horndeski type actions, where the dynamics of the scalar field is induced. The classical equations of motion and the Weeler-deWitt equation, in their ... More
Covering R-treesJul 24 2007Dec 10 2008We show that every inner metric space X is the metric quotient of a complete R-tree via a free isometric action, which we call the covering R-tree of X. The quotient mapping is a weak submetry (hence, open) and light. In the case of compact 1-dimensional ... More
Interpolants of Lattice Functions for the Analysis of Atomistic/Continuum Multiscale MethodsApr 17 2012We introduce a general class of (quasi-)interpolants of functions defined on a Bravais lattice, and establish several technical results for these interpolants that are crucial ingredients in the analysis of atomistic models and atomistic/continuum multi-scale ... More
On the role of local many-body interactions on the thermoelectric properties of fullerene junctionsAug 07 2019The role of local electron-vibration and electron-electron interactions on the thermoelectric properties of molecular junctions is theoretically analyzed focusing on devices based on fullerene molecules. A self-consistent adiabatic approach is used in ... More
Two-parameter generalization of the logarithm and exponential functions and Boltzmann-Gibbs-Shannon entropyMar 30 2007The $q$-sum $x \oplus_q y \equiv x+y+(1-q) xy$ ($x \oplus_1 y=x+y$) and the $q$-product $x\otimes_q y \equiv [x^{1-q} +y^{1-q}-1]^{\frac{1}{1-q}}$ ($x\otimes_1 y=x y$) emerge naturally within nonextensive statistical mechanics. We show here how they lead ... More
Deforming the Lie algebra of vector fields on $S^1$ inside the Poisson algebra on $\dot T^*S^1$Jul 07 1997We study deformations of the standard embedding of the Lie algebra $\Vect(S^1)$ of smooth vector fields on the circle, into the Lie algebra of functions on the cotangent bundle $T^*S^1$ (with respect to the Poisson bracket). We consider two analogous ... More
The interleaved multichromatic number of a graphSep 23 2003For $k\ge 1$, we consider interleaved $k$-tuple colorings of the nodes of a graph, that is, assignments of $k$ distinct natural numbers to each node in such a way that nodes that are connected by an edge receive numbers that are strictly alternating between ... More
Conformally equivariant quantizationJan 27 1998Feb 25 2000Let $(M,g)$ be a pseudo-Riemannian manifold and $F_\lambda(M)$ the space of densities of degree $\lambda$ on $M$. We study the space $D^2_{\lambda,\mu}(M)$ of second-order differential operators from $F_\lambda(M)$ to $F_\mu(M)$. If $(M,g)$ is conformally ... More
High order Nyström methods for transmission problems for Helmholtz equationOct 22 2015May 12 2016We present superalgebraic compatible Nystr\"om discretizations for the four Helmholtz boundary operators of Calder\'{o}n's calculus on smooth closed curves in 2D. These discretizations are based on appropriate splitting of the kernels combined with very ... More
Isotope shift calculations for atoms with one valence electronMay 16 2003This work presents a method for the ab initio calculation of isotope shift in atoms and ions with one valence electron above closed shells. As a zero approximation we use relativistic Hartree-Fock and then calculate correlation corrections. The main motivation ... More
Transitions in Zr, Hf, Ta, W, Re, Hg, Ac and U ions with high sensitivity to variation of the fine-structure constantSep 22 2011We study transitions between ground and low-energy excited states of heavy ions corresponding to s-d single-electron transitions or s^2-d^2 double-electron transitions. The large nuclear charge Z and significant change in angular momentum of electron ... More