Results for "N. L. Achouri"

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Comment on "First Observation of Ground State Dineutron Decay: 16Be"Apr 26 2012Dec 10 2012A recent measurement [Spyrou et al., PRL 108, 102501 (2012)] of the in-flight decay of 16Be into 14Be+n+n has been interpreted as the first case of dineutron emission. Here we point out that the inclusion of the n-n interaction neglected in the description ... More
Beta-delayed proton decay of proton-rich nuclei 23Al and 31Cl and explosive H-burning in classical novaeJan 03 2009We have developed a technique to measure beta-delayed proton decay of proton-rich nuclei produced and separated with the MARS recoil spectrometer of Texas A&M University. The short-lived radioactive species are produced in-flight, separated, then slowed ... More
The beta-gamma decay of 21NaJun 30 2009Mar 23 2010A new and independent determination of the Gamow-Teller branching ratio in the beta-decay of 21Na is reported. The value obtained of 5.13 +- 0.43 % is in agreement with the currently adopted value and the most recent measurement. In contrast to previous ... More
Resonances in 19Ne with relevance to the astrophysically important 18F(p,α)15O reactionDec 20 2011The most intense gamma-ray line observable from novae is likely to be from positron annihilation associated with the decay of 18F. The uncertainty in the destruction rate of this nucleus through the 18F(p,{\alpha})15O reaction presents a limit to interpretation ... More
Structure of $^{13}$Be probed via secondary beam reactionsDec 09 2013Feb 28 2014The low-lying level structure of the unbound neutron-rich nucleus $^{13}$Be has been investigated via breakup on a carbon target of secondary beams of $^{14,15}$B at 35 MeV/nucleon. The coincident detection of the beam velocity $^{12}$Be fragments and ... More
Single-Proton Removal Reaction Study of 16BFeb 28 2008The low-lying level structure of the unbound system $^{16}$B has been investigated via single-proton removal from a 35 MeV/nucleon $^{17}$C beam. The coincident detection of the beam velocity $^{15}$B fragment and neutron allowed the relative energy of ... More
Study of multi-neutron emission in the $β$-decay of $^{11}$LiJun 11 2019The kinematics of two-neutron emission following the $\beta$-decay of $^{11}$Li was investigated for the first time by detecting the two neutrons in coincidence and by measuring their angle and energy. An array of liquid-scintillator neutron detectors ... More
The beta-decay of 22AlAug 01 2006In an experiment performed at the LISE3 facility of GANIL, we studied the decay of 22Al produced by the fragmentation of a 36Ar primary beam. A beta-decay half-life of 91.1 +- 0.5 ms was measured. The beta-delayed one- and two-proton emission as well ... More
Space-Wave Routing via Surface Waves Using a Metasurface SystemDec 16 2016We introduce the concept of a metasurface system able to route space wave via surface waves. This concept may be used to laterally shift or modulate the beam width of scattered waves. We propose two corresponding synthesis techniques, one that is exact ... More
Controllable Angular Scattering with a Bianisotropic MetasurfaceJan 25 2017We propose the concept of a bianisotropic metasurface with controllable angular scattering. We illustrate this concept with the synthesis and the analysis of a metasurface exhibiting controllable absorption and transmission phase as function of the incidence ... More
Prolate-Spherical Shape Coexistence at N=28 in $^{44}$SJul 28 2010The structure of $^{44}$S has been studied using delayed $\gamma$ and electron spectroscopy at \textsc{ganil}. The decay rates of the 0$^+_2$ isomeric state to the 2$^+_1$ and 0$^+_1$ states have been measured for the first time, leading to a reduced ... More
Migration of nuclear shell gaps studied in the d(24Ne,p gamma)25Ne reactionApr 09 2010The transfer of neutrons onto 24Ne has been measured using a reaccelerated radioactive beam of 24Ne to study the (d,p) reaction in inverse kinematics. The unusual raising of the first 3/2+ level in 25Ne and its significance in terms of the migration of ... More
Metasurface Solar Sail for flexible Radiation Pressure ControlOct 08 2017We propose to use metasurfaces as a mean of controlling radiation pressure for increasing the range of motions of spacecraft solar sails. Specifically, we present a theoretical study of different electromagnetic field configurations, and corresponding ... More
Design, Concepts and Applications of Electromagnetic MetasurfacesDec 02 2017The paper overviews our recent work on the synthesis of metasurfaces and related concepts and applications. The synthesis is based on generalized sheet transition conditions (GSTCs) with a bianisotropic surface susceptibility tensor model of the metasurface ... More
The 7Be(d,p)2alpha cross section at Big Bang energies and the primordial 7Li abundanceAug 22 2005The WMAP satellite, devoted to the observations of the anisotropies of the Cosmic Microwave Background (CMB) radiation, has recently provided a determination of the baryonic density of the Universe with unprecedented precision. Using this, Big Bang Nucleosynthesis ... More
Structure of 23Al from one-proton breakup reaction and astrophysical implicationsApr 04 2011Apr 10 2011The ground state of the proton-rich nucleus 23Al has been studied by one-proton removal on a carbon target at about 50 MeV/nucleon using the EXOGAM + SPEG experimental setup at GANIL. Longitudinal momentum distributions of the 22Mg breakup fragments, ... More
Beta-decay properties of $^{25}$Si and $^{26}$PNov 15 2004The $\beta$-decay properties of the neutron-deficient nuclei $^{25}$Si and $^{26}$P have been investigated at the GANIL/LISE3 facility by means of charged-particle and $\gamma$-ray spectroscopy. The decay schemes obtained and the Gamow-Teller strength ... More
Collapse of the N=28 shell closure in $^{42}$SiMay 31 2007The energies of the excited states in very neutron-rich $^{42}$Si and $^{41,43}$P have been measured using in-beam $\gamma$-ray spectroscopy from the fragmentation of secondary beams of $^{42,44}$S at 39 A.MeV. The low 2$^+$ energy of $^{42}$Si, 770(19) ... More
Spectroscopy of $^{18}$Na: Bridging the two-proton radioactivity of $^{19}$MgOct 06 2011The unbound nucleus $^{18}$Na, the intermediate nucleus in the two-proton radioactivity of $^{19}$Mg, was studied by the measurement of the resonant elastic scattering reaction $^{17}$Ne(p,$^{17}$Ne)p performed at 4 A.MeV. Spectroscopic properties of ... More
Re-examining the transition into the N=20 island of inversion: structure of $^{30}$MgFeb 27 2018Intermediate energy single-neutron removal from $^{31}$Mg has been employed to investigate the transition into the N=20 island of inversion. Levels up to 5~MeV excitation energy in $^{30}$Mg were populated and spin-parity assignments were inferred from ... More
TIARA: a large solid angle silicon array for direct reaction studies with radioactive beamsAug 20 2009Jan 13 2010A compact, quasi-4pi position sensitive silicon array, TIARA, designed to study direct reactions induced by radioactive beams in inverse kinematics is described here. The Transfer and Inelastic All-angle Reaction Array (TIARA) consists of 8 resistive ... More
Emergence of the N=16 shell gap in 21ODec 18 2010The spectroscopy of 21O has been investigated using a radioactive 20O beam and the (d,p) reaction in inverse kinematics. The ground and first excited states have been determined to be Jpi=5/2+ and Jpi=1/2+ respectively. Two neutron unbound states were ... More
First observation of 20B and 21BJan 02 2019The most neutron-rich boron isotopes 20B and 21B have been observed for the first time following proton removal from 22N and 22C at energies around 230 MeV/nucleon. Both nuclei were found to exist as resonances which were detected through their decay ... More
Single-neutron knockout from $^{20}\textrm{C}$ and the structure of $^{19}\textrm{C}$Apr 12 2017The low-lying unbound level structure of the halo nucleus $^{19}\textrm{C}$ has been investigated using single-neutron knockout from $^{20}\textrm{C}$ on a carbon target at 280 MeV/nucleon. The invariant mass spectrum, derived from the momenta of the ... More
Efficient Analysis of Metasurfaces in Terms of Spectral-Domain GSTC Integral EquationsApr 22 2017We present a spectral-domain (SD) technique for the efficient analysis of metasurfaces. The metasurface is modeled by generalized sheet transition conditions (GSTCs) as a zero-thickness sheet creating a discontinuity in the electromagnetic field. The ... More
General Metasurface Synthesis Based on Susceptibility TensorsAug 01 2014Feb 17 2015A general method, based on susceptibility tensors, is proposed for the synthesis of metasurfaces transforming arbitrary incident waves into arbitrary reflected and transmitted waves. The proposed method exhibits two advantages: 1)it is inherently vectorial, ... More
Shell evolution approaching the N=20 island of inversion: structure of 26NaAug 07 2015Jun 03 2016The levels in 26Na with single particle character have been observed for the first time using the d(25Na,p gamma) reaction at 5 MeV/nucleon. The measured excitation energies and the deduced spectroscopic factors are in good overall agreement with (0+1) ... More
In-beam spectroscopic studies of $^{44}$S nucleusJan 06 2012The structure of the $^{44}$S nucleus has been studied at GANIL through the one proton knock-out reaction from a $^{45}$Cl secondary beam at 42 A$\cdot$MeV. The $\gamma$ rays following the de-excitation of $^{44}$S were detected in flight using the 70 ... More
Simulation of Metasurfaces in Finite Difference TechniquesFeb 12 2016We introduce a rigorous and simple method for analyzing metasurfaces, modeled as zero-thickness electromagnetic sheets, in Finite Difference (FD) techniques. The method consists in describing the spatial discontinuity induced by the metasurface as a virtual ... More
A Formal Semantic for UML 2.0 Activity Diagram based on Institution TheoryJun 07 2016Giving a formal semantic to an UML Activity diagram (UML AD) is a hard task. The reason of this difficulty is the ambiguity and the absence of a precise formal semantic of such semi-formal formalism. A variety of semantics exist in the literature having ... More
Synthesis and Applications of Birefringent MetasurfacesJul 18 2016Birefringent metasurfaces are two-dimensional structures capable of independently controlling the amplitude, phase and polarization of orthogonally polarized incident waves. In this work, we propose a in-depth discussion on the mathematical synthesis ... More
Influence of Reciprocity, Symmetry and Normal Polarizations on the Angular Scattering Properties of Bianisotropic MetasurfacesAug 24 2018This paper aims at studying the angular scattering properties of bianisotropic metasurfaces and at clarifying the different roles played by tangential and normal polarization densities. Different types of metasurfaces are considered for this study and ... More
Surface-Wave Dispersion Retrieval Method and Synthesis Technique for Bianisotropic MetasurfacesMay 14 2018We propose a surface-wave dispersion retrieval method and synthesis technique that applies to bianisotropic metasurfaces that are embedded in symmetric or asymmetric environments. Specifically, we use general zero-thickness sheet transition conditions ... More
Study of the Angular Spectrum of a Bianisotropic Refractive Metasurface at a Dielectric InterfaceJan 25 2018We present an initial study of the angular spectrum of a bianisotropic refractive metasurface at an interface between two dielectric media. In this study, we report on the existence of three distinct angular regions: a)~a rotated transmission cone, b)~a ... More
Mathematical Synthesis and Analysis of Nonlinear MetasurfacesMar 27 2017We propose a discussion on the synthesis and scattering analysis of nonlinear metasurfaces. For simplicity, we investigate the case of a second-order nonlinear isotropic metasurface possessing both electric and magnetic linear and nonlinear susceptibility ... More
High Precision Measurement of the $^{19}$Ne Half-life using real-time digital acquisitionSep 27 2017The half-life of $^{19}$Ne has been measured using a real-time digital multiparametric acquisition system providing an accurate time-stamp and relevant information on the detectors signals for each decay event. An exhaustive offline analysis of the data ... More
Spacetime Processing Metasurfaces: GSTC Synthesis and Prospective ApplicationsFeb 13 2016The paper presents the general concept of spacetime processing metasurfaces, synthesized by generalized sheet transition conditions (GSTCs). It is shown that such metasurfaces can perform multiple simultaneous spatio-temporal processing transformations ... More
Dielectric Resonator Metasurface for Dispersion EngineeringMay 24 2016We introduce a practical dielectric metasurface design for microwave frequencies. The metasurface is made of an array of dielectric resonators held together by dielectric connections thus avoiding the need of a mechanical support in the form of a dielectric ... More
Refracting Metasurfaces without Spurious DiffractionMay 24 2017Jun 12 2017Refraction represents one of the most fundamental operations that may be performed by a metasurface. However, simple phasegradient metasurface designs suffer from restricted angular deflection due to spurious diffraction orders. It has been recently shown, ... More
Spontaneous Emission and Light Extraction Enhancement of Light Emitting Diode Using Partially-Reflecting Metasurface Cavity (PRMC)Oct 05 2016Oct 14 2016The enhancement of the power conversion efficiency (PCE), and subsequent reduction of cost, of light emitting diodes (LEDs) is of crucial importance in the current lightening market. For this reason, we propose here a PCE-enhanced LED architecture, based ... More
Metasurface Spatial Processor for Electromagnetic Remote ControlOct 20 2015We introduce the concept of metasurface spatial processor, whose transmission is remotely and coherently controlled by the superposition of an incident wave and a control wave through the metasurface. The conceptual operation of this device is analogous ... More
Perfectly Refractive Metasurface using BianisotropyMar 31 2017Apr 26 2017A passive and reciprocal perfectly refractive metasurface is designed using a general susceptiblity synthesis method. The metasurface uses weak spatial dispersion in the form of bianisotropy to achieve perfect refraction. Its operation is validated using ... More
Computational Analysis of MetasurfacesOct 30 2017Metasurfaces represent one of the most vibrant fields of modern science and technology. A metasurface is a complex electromagnetic structure, that is typically deeply subwavelength in thickness, electrically large in transverse size and composed of subwavelength ... More
Generalized Optical Signal Processing Based on Multi-Operator Metasurfaces Synthesized by Susceptibility TensorsNov 06 2018This paper theoretically proposes a multichannel functional metasurface computer characterized by Generalized Sheet Transition Conditions (GSTCs) and surface susceptibility tensors. The study explores a polarization- and angle-multiplexed metasurfaces ... More
Study of multi-neutron systems with SAMURAI spectrometerMar 27 2019The tetraneutron has been drawing the attention of the nuclear physics community for decades, but a firm conclusion on its existence and properties is still far from being reached despite many experimental and theoretical efforts. New measurements have ... More
How Robust is the N = 34 Subshell Closure? First Spectroscopy of $^{52}$ArNov 20 2018The first $\gamma$-ray spectroscopy of $^{52}$Ar, with the neutron number N = 34, was measured using the $^{53}$K(p,2p) one-proton removal reaction at $\sim$210 MeV/u at the RIBF facility. The 2$^{+}_{1}$ excitation energy is found at 1656(18) keV, the ... More
How Robust is the N = 34 Subshell Closure? First Spectroscopy of $^{52}$ArNov 20 2018Feb 25 2019The first $\gamma$-ray spectroscopy of $^{52}$Ar, with the neutron number N = 34, was measured using the $^{53}$K(p,2p) one-proton removal reaction at $\sim$210 MeV/u at the RIBF facility. The 2$^{+}_{1}$ excitation energy is found at 1656(18) keV, the ... More
How Robust is the N = 34 Subshell Closure? First Spectroscopy of $^{52}$ArNov 20 2018Feb 27 2019The first $\gamma$-ray spectroscopy of $^{52}$Ar, with the neutron number N = 34, was measured using the $^{53}$K(p,2p) one-proton removal reaction at $\sim$210 MeV/u at the RIBF facility. The 2$^{+}_{1}$ excitation energy is found at 1656(18) keV, the ... More
Search for Superscreening effect in SuperconductorDec 14 2012The decay of $^{19}$O($\beta^-$) and $^{19}$Ne($\beta^+$) implanted in niobium in its superconducting and metallic phase was measured using purified radioactive beams produced by the SPIRAL/GANIL facility. Half-lives and branching ratios measured in the ... More
Clebsch-Gordan Coefficients for the Extended Quantum-Mechanical Poincaré Group and Angular Correlations of Decay ProductsJul 26 2004Sep 07 2004This paper describes Clebsch-Gordan coefficients (CGCs) for unitary irreducible representations (UIRs) of the extended quantum mechanical Poincar\'e group $\pt$. `Extended' refers to the extension of the 10 parameter Lie group that is the Poincar\'e group ... More
Periodic orbits of the ensemble of Sinai-Arnold cat maps and pseudorandom number generationSep 14 2004Mar 01 2006We propose methods for constructing high-quality pseudorandom number generators (RNGs) based on an ensemble of hyperbolic automorphisms of the unit two-dimensional torus (Sinai-Arnold map or cat map) while keeping a part of the information hidden. The ... More
Nonreciprocal Nongyrotropic Magnetless MetasurfaceAug 25 2016Aug 29 2016We introduce a nonreciprocal nongyrotropic magnetless metasurface. In contrast to previous nonreciprocal structures, this metasurface does not require a biasing magnet, and is therefore lightweight and amenable to integrated circuit fabrication. Moreover, ... More
Homogenization and Scattering Analysis of Second-Harmonic Generation in Nonlinear MetasurfacesFeb 28 2018We propose an extensive discussion on the homogenization and scattering analysis of second-order nonlinear metasurfaces. Our developments are based on the generalized sheet transition conditions (GSTCs) which are used to model the electromagnetic responses ... More
What is Nonreciprocity? Part IIApr 01 2018Apr 07 2018This paper is the second part of a two-part paper on \emph{Electromagnetic (EM) Nonreciprocity (NR)}. Part~I has defined NR, pointed out that linear NR is a stronger form of NR than nonlinear (NL) NR, explained EM Time-Reversal (TR) Symmetry (TRS) Breaking ... More
Synthesis of Electromagnetic Metasurfaces: Principles and IllustrationsOct 20 2015The paper presents partial overview of the mathematical synthesis and the physical realization of metasurfaces, and related illustrative examples. The synthesis consists in determining the exact tensorial surface susceptibility functions of the metasurface, ... More
Quantum advantages in classically defined tasksOct 09 2007Apr 13 2008We analyze classically defined games for which a quantum team has an advantage over any classical team. The quantum team has a clear advantage in games in which the players of each team are separated in space and the quantum team can use unusually strong ... More
The Effect of Type Ibc Contamination in Cosmological Supernova SamplesOct 25 2004We explore the effect of contamination of intermediate redshift Type Ia supernova samples by Type Ibc supernovae. Simulating observed samples of Ia and mixed Ibc/Ia populations at a range of redshifts for an underlying cosmological concordance model (\Omega_{m}=0.27, ... More
Conformal string operators and evolution of skewed parton distributionsMar 30 1999We have investigated skewed parton distributions in coordinate space. We found that their evolution can be described in a simple manner in terms of non-local, conformal operators introduced by Balitsky and Braun. The resulting formula is given by a Neumann ... More
Quantum mechanics and Leggett's principles of macroscopic realismOct 05 2006Mar 23 2007On the basis of our recent model of a one-dimensional (1D) completed scattering we argue that Leggett's principles of macroscopic realism must and can be extended onto the level of single electrons and atoms. These principles need three quite feasible ... More
New Model of One-dimensional Completed Scattering and the Problem of Quantum NonlocalitySep 09 2006The origin of nonlocality in quantum mechanics (QM) is analyzed from the viewpoint of our new model of a one-dimensional (1D) completed scattering. Our study of quantum nonlocality complements those carried out by Volovich and Khrennikov. They pointed ... More
Temporal aspects of one-dimensional completed scattering: An alternative viewNov 03 2005Dec 29 2005A {\it completed} scattering of a particle on a static one-dimensional (1D) potential barrier is a combined quantum process to consist from two elementary sub-processes (transmission and reflection) evolved coherently at all stages of scattering and macroscopically ... More
Larmor times for transmission and reflectionJul 20 2005Aug 15 2005On the basis of quant-ph/0405028 we define the Larmor times for transmission and reflection. These times are valid both for the stationary and time-dependent scattering processes, without any restrictions on the shape of Gaussian-like wave packets. We ... More
A comparative analysis of tunneling time concepts: Where do transmitted particles start from, on the average?Jan 13 2005Jan 19 2005In this paper we compare the concept of the tunneling time introduced in quant-ph/0405028 with those of the phase and dwell times. As is shown, unlike the latter our definition of the transmission time coincides, in the limit of weak scattering potentials, ... More
Wave functions and characteristic times for transmission and reflectionMay 06 2004Nov 13 2004We present a renewed wave-packet analysis based on the following ideas: if a quantum one-particle scattering process and the corresponding state are described by an indivisible wave packet to move as a whole at all stages of scattering, then they are ... More
Wave functions and tunneling times for one-dimensional transmission and reflectionNov 13 2003Apr 12 2004It is shown that in the case of the one-particle one-dimensional scattering problem for a given time-independent potential, for each state of the whole quantum ensemble of identically prepared particles, there is an unique pair of (subensemble's) solutions ... More
Quantum mechanics as a macrorealistic theoryMay 24 2007Sep 20 2007As contrasted with physicists to idolize Bell's theorem and quantum nonlocality, we argue that quantum mechanics (QM), in reality, respects the principles of a macroscopic realism (PMRs). The current QM to tell us that "... the state of a system can be ... More
Quantum Mechanics without NonlocalityFeb 21 2006May 20 2006We argue that quantum nonlocality of entangled states is not an actual phenomenon. It appears in quantum mechanics as a consequence of the inconsistency of its superposition principle with the corpuscular properties of a quantum particle. In the existing ... More
From the paradoxes of the standard wave-packet analysis to the definition of tunneling times for particlesJun 23 2001Oct 12 2002We develop a new variant of the wave-packet analysis and solve the tunneling time problem for one particle. Our approach suggests an individual asymptotic description of the quantum subensembles of transmitted and reflected particles both at the final ... More
Symmetry and Natural Quantum Structures for Three-Particles in One-DimensionJul 02 2016How do symmetries induce natural and useful quantum structures? This question is investigated in the context of models of three interacting particles in one-dimension. Such models display a wide spectrum of possibilities for dynamical systems, from integrability ... More
One-Dimensional Traps, Two-Body Interactions, Few-Body Symmetries: I. One, Two, and Three ParticlesDec 31 2014Aug 24 2015This is the first in a pair of articles that classify the configuration space and kinematic symmetry groups for $N$ identical particles in one-dimensional traps experiencing Galilean-invariant two-body interactions. These symmetries explain degeneracies ... More
Poincare Semigroup Symmetry as an Emergent Property of Unstable SystemsNov 25 2005The notion that elementary systems correspond to irreducible representations of the Poincare group is the starting point for this paper, which then goes on to discuss how a semigroup for the time evolution of unstable states and resonances could emerge ... More
Dynamical Entanglement in Particle ScatteringJun 24 2005This paper explores the connections between particle scattering and quantum information theory in the context of the non-relativistic, elastic scattering of two spin-1/2 particles. An untangled, pure, two-particle in-state is evolved by an S-matrix that ... More
Cycles of Activity in the Jovian AtmosphereAug 17 2017Jupiter's banded appearance may appear unchanging to the casual observer, but closer inspection reveals a dynamic, ever-changing system of belts and zones with distinct cycles of activity. Identification of these long-term cycles requires access to datasets ... More
Self-Consistent Nuclear Shell-Model Calculation Starting from a Realistic NN PotentialApr 26 2005First self-consistent realistic shell-model calculation for the light p-shell nuclei is performed, starting from the high-precision nucleon-nucleon (NN) CD-Bonn potential. This realistic potential is renormalized deriving a low-momentum NN potential V-low-k ... More
$Λ$CDM-like models with future singularitiesJul 16 2019We consider new models of dark energy with finite time future singularities, by introducing the pressure density as a function of the scale factor. This approach gives acceptable phenomenological models of dark energy, practically indistinguishable from ... More
What is Nonreciprocity?Apr 01 2018May 07 2018This paper aims at providing a global perspective on electromagnetic nonreciprocity and clarifying confusions that arose in the recent developments of the field. It provides a general definition of nonreciprocity and classifies nonreciprocal systems according ... More
Inelastic electron-phonon scattering and excess current in superconducting point contacts with a short coherence lengthDec 13 2015Nonlinear electrical effects in superconducting S-c-S contacts, including the spectroscopy of electron-phonon interactions (EPI) in these systems, and the recovery of the EPI function from experimental data are discussed. The effect of a magnetic field ... More
NLO corrections to the twist-3 amplitude in DVCS on a nucleon in the Wandzura-Wilczek approximation: quark caseMay 19 2003May 20 2003We computed the NLO corrections to twist-3, $L \to T$, flavor non-singlet amplitude in DVCS on a nucleon in the Wandzura-Wilczek approximation. Explicit calculation shows that factorization holds for NLO contribution to this amplitude, although the structure ... More
Central charges and boundary fields for two dimensional dilatonic black holesDec 05 2003Dec 11 2003In this paper we first show that within the Hamiltonian description of general relativity, the central charge of a near horizon asymptotic symmetry group is zero, and therefore that the entropy of the system cannot be estimated using Cardy's formula. ... More
Effective action for the Regge processes in gravityMay 16 2011It is shown, that the effective action for the reggeized graviton interactions can be formulated in terms of the reggeon fields $A^{++}$ and $A^{--}$ and the metric tensor $g_{\mu \nu}$ in such a way, that it is local in the rapidity space and has the ... More
Hints of Cosmic String Induced Discontinuities in the COBE Data?Mar 28 1998We apply new statistical tests on the four year 53 GHz DMR data and show that there is significant probability for the existence of coherent temperature discontinuities hidden in the CMB maps around the Galactic Poles. Comparing Monte Carlo simulations ... More
Construction of Cosmic String Induced Temperature Anisotropy Maps with CMBFAST and Statistical AnalysisSep 19 2000We use the publicly available code CMBFAST as modified by L. Pogosian and T. Vachaspati to simulate the effects of wiggly cosmic strings on the Cosmic Microwave Background (CMB). Using the modified CMBFAST code which takes into account vector modes and ... More
Stationary states of an electron in periodic structures in a constant uniform electrical fieldMar 24 1998Apr 03 1998On the basis of the transfer matrix technique an analytical method to investigate the stationary states, for an electron in one-dimensional periodic structures in an external electrical field, displaying the symmetry of the problem is developed. These ... More
From a 1D completed scattering and double slit diffraction to the quantum-classical problem for isolated systemsJan 24 2011Apr 09 2011By probability theory the probability space to underlie the set of statistical data described by the squared modulus of a coherent superposition of microscopically distinct (sub)states (CSMDS) is non-Kolmogorovian and, thus, such data are mutually incompatible. ... More
Infinite Barriers and Symmetries for a Few Trapped Particles in One DimensionAug 25 2016This article analyzes symmetries for models describing a few particles in a one-dimensional, few-well trap. In addition to parity and particle permutation symmetry, the symmetry of separability, well permutation symmetry, and ordering permutation symmetry ... More
Calculating the Habitable Zone of Binary Star Systems II: P-Type BinariesJun 12 2013Sep 19 2013We have developed a comprehensive methodology for calculating the circumbinary HZ in planet-hosting P-type binary star systems. We present a general formalism for determining the contribution of each star of the binary to the total flux received at the ... More
The superconducting proposal for the CS magnet system of FAST: a preliminary analysis of the heat load due to AC lossesJan 30 2011FAST (Fusion Advanced Studies Torus), the Italian proposal of a Satellite Facility to ITER, is a compact tokamak (R$_0$ = 1.82 m, a = 0.64 m, triangularity $\delta$ = 0.4) able to investigate non-linear dynamics effects of $\alpha$-particle behavior in ... More
Infinite Barriers and Symmetries for a Few Trapped Particles in One DimensionAug 25 2016Apr 06 2017This article investigates the properties of a few interacting particles trapped in a few wells and how these properties change under adiabatic tuning of interaction strength and inter-well tunneling. While some system properties are dependent on the specific ... More
Identical Wells, Symmetry Breaking, and the Near-Unitary LimitJan 04 2017Energy level splitting from the unitary limit of contact interactions to the near unitary limit for a few identical atoms in an effectively one-dimensional well can be understood as an example of symmetry breaking. At the unitary limit in addition to ... More
Five is More: Comments on Symmetry, Integrability, and Solvability for a Few Particles in a One-Dimensional TrapSep 01 2015Nov 17 2015This contributed conference proceeding reviews some results about a system of a few identical particles with spin trapped in one-dimensional potentials and experiencing two-body interactions. The focus is on how symmetry, integrability, and solvability ... More
Spectroscopy for a Few Atoms Harmonically-Trapped in One DimensionDec 20 2013May 27 2014Spectroscopic labels for a few particles with spin that are harmonically trapped in one-dimension with effectively zero-range interactions are provided by quantum numbers that characterize the symmetries of the Hamiltonian: permutations of identical particles, ... More
ESO Imaging Survey: Finding Targets for VLTSep 16 1998Data from the wide-angle, moderately deep ESO Imaging Survey have been used to produce target lists for the first year of the VLT. About 250 candidate clusters of galaxies have been identified from the I-band images covering $\sim$ 17 square degrees. ... More
Asymptotic estimates for unimodular multilinear forms on sequence spaces with small normsOct 26 2017Mar 19 2019The existence of unimodular forms on sequence spaces with small norms is crucial in a variety of problems in modern analysis. As a consequence of our results, we prove that the optimal solution $f(n_{1},\dots,n_{d})$ for the asymptotic estimate \[ 0<B_{d}\leq\inf\frac{\left\Vert ... More
Individual versus cluster recoveries within a spatially structured populationMar 14 2006Stochastic modeling of disease dynamics has had a long tradition. Among the first epidemic models including a spatial structure in the form of local interactions is the contact process. In this article we investigate two extensions of the contact process ... More
Landau-Bogolubov Energy Spectrum of SuperconductorsMar 23 2019We demonstrate that a dispersion relation of elementary excitations in the Fermi liquid as a superconductor is identical to the one in a quantum liquid HeII. Hence, we show that the superconductivity is, in fact, the same as superfluidity, but for charged ... More
Unintegrated gluon in the photon and heavy quark productionSep 03 2002Nov 12 2002The unintegrated gluon density in the photon is determined, using the Kimber-Martin-Ryskin prescription . In addition, a model of the unintegrated gluon is proposed, based on the saturation model extended to the large-x region. These gluon densities are ... More
Spectre automorphe des variétés hyperboliques et applications topologiquesNov 17 2004This book is made of two parts. The first is concerned with the differential form spectrum of congruence hyperbolic manifolds. We prove Selberg type theorems on the first eigenvalue of the laplacian on differential forms. The method of proof is representation ... More
Analytic properties of high energy production amplitudes in N=4 SUSYAug 05 2010Nov 12 2010We investigate analytic properties of the six point planar amplitude in N=4 SUSY at the multi-Regge kinematics for final state particles. For inelastic processes the Steinmann relations play an important role because they give a possibility to fix the ... More
Calculating the Habitable Zone of Binary Star Systems I: S-Type BinariesJun 12 2013Sep 19 2013We have developed a comprehensive methodology for calculating the boundaries of the habitable zone (HZ) of planet-hosting S-type binary star systems. Our approach is general and takes into account the contribution of both stars to the location and extent ... More
The stationary Dirac equation as a generalized Pauli equation for two quasiparticlesOct 21 2014Apr 14 2015By analyzing the Dirac equation with static electric and magnetic fields it is shown that Dirac's theory is nothing but a generalized one-particle quantum theory compatible with the special theory of relativity. This equation describes a {\it quantum} ... More