Results for "D. M. Zajac"

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Structure and zero-dimensional polariton spectrum of natural defects in GaAs/AlAs microcavitiesAug 01 2012We present a correlative study of structural and optical properties of natural defects in planar semiconductor microcavities grown by molecular beam epitaxy, which are showing a localized polariton spectrum as reported in Zajac et al., Phys. Rev. B 85, ... More
Parametric scattering of microcavity polaritons into ghost branchesOct 04 2012Polaritons of defined momentum and energy are excited resonantly on the lower polariton branch of a planar semiconductor microcavity in the strong coupling regime, and the spectrally and momentum resolved emission is analyzed. We observe ghost branches ... More
Scalable gate architecture for densely packed semiconductor spin qubitsJul 24 2016We demonstrate a 12 quantum dot device fabricated on an undoped Si/SiGe heterostructure as a proof-of-concept for a scalable, linear gate architecture for semiconductor quantum dots. The device consists of 9 quantum dots in a linear array and 3 single ... More
A Reconfigurable Gate Architecture for Si/SiGe Quantum DotsFeb 05 2015We demonstrate a reconfigurable quantum dot gate architecture that incorporates two interchangeable transport channels. One channel is used to form quantum dots and the other is used for charge sensing. The quantum dot transport channel can support either ... More
Single-Spin Relaxation in a Synthetic Spin-Orbit FieldNov 02 2018Strong magnetic field gradients can produce a synthetic spin-orbit interaction that allows for high fidelity electrical control of single electron spins. We investigate how a field gradient impacts the spin relaxation time T_1 by measuring T_1 as a function ... More
Circuit Quantum Electrodynamics Architecture for Gate-Defined Quantum Dots in SiliconOct 18 2016We demonstrate a hybrid device architecture where the charge states in a double quantum dot (DQD) formed in a Si/SiGe heterostructure are read out using an on-chip superconducting microwave cavity. A quality factor Q = 5,400 is achieved by selectively ... More
Shuttling a single charge across a one-dimensional array of silicon quantum dotsSep 11 2018Significant advances have been made towards fault-tolerant operation of silicon spin qubits, with single qubit fidelities exceeding 99.9%, several demonstrations of two-qubit gates based on exchange coupling, and the achievement of coherent single spin-photon ... More
Site-selective quantum control in an isotopically enriched 28Si/SiGe quadruple quantum dotMar 14 2019Silicon spin qubits are a promising quantum computing platform offering long coherence times, small device sizes, and compatibility with industry-backed device fabrication techniques. In recent years, high fidelity single-qubit and two-qubit operations ... More
A Coherent Spin-Photon Interface in SiliconOct 09 2017Electron spins in silicon quantum dots are attractive systems for quantum computing due to their long coherence times and the promise of rapid scaling using semiconductor fabrication techniques. While nearest neighbor exchange coupling of two spins has ... More
Quantum CNOT Gate for Spins in SiliconAug 11 2017Single qubit rotations and two-qubit CNOT operations are crucial ingredients for universal quantum computing. While high fidelity single qubit operations have been achieved using the electron spin degree of freedom, realizing a robust CNOT gate has been ... More
Investigation of Mobility Limiting Mechanisms in Undoped Si/SiGe HeterostructuresMar 19 2015We perform detailed magnetotransport studies on two-dimensional electron gases (2DEGs) formed in undoped Si/SiGe heterostructures in order to identify the electron mobility limiting mechanisms in this increasingly important materials system. By analyzing ... More
High-fidelity quantum gates in Si/SiGe double quantum dotsNov 02 2017Motivated by recent experiments of Zajac et al. [arXiv:1708.03530], we theoretically describe high-fidelity two-qubit gates using the exchange interaction between the spins in neighboring quantum dots subject to a magnetic field gradient. We use a combination ... More
Growth and electronic and magnetic structure of iron oxide films on Pt(111)Nov 25 2011Nov 30 2011Ultrathin (111)-oriented polar iron oxide films were grown on a Pt(111) single crystal either by the reactive deposition of iron or oxidation of metallic iron monolayers. These films were characterized using low energy electron diffraction, scanning tunneling ... More
Direct evidence of the orbital contribution to the magnetic moment in AA'FeReO6 double perovskitesMar 15 2005Spin and orbital magnetic moments of Re in AA'FeReO6 double perovskites (A,A' = Ba, Sr, Ca) have been directly probed employing XMCD spectroscopy at the Re L2,3-edges. A considerable orbital magnetic moment is observed in all the studied compounds despite ... More
Screening nuclear field fluctuations in quantum dots for indistinguishable photon generationSep 03 2015Jan 08 2016A semiconductor quantum dot can generate highly coherent and indistinguishable single photons. However, intrinsic semiconductor dephasing mechanisms can reduce the visibility of two-photon interference. For an electron in a quantum dot, a fundamental ... More
Calculations for electron-impact ionization of beryllium in the method of interacting configurations in the complex number representationAug 14 2016The beginning of the application of the method of interacting configurations in the complex number representation to the compound atomic systems has been presented. The spectroscopic characteristics of the Be atom in the problem of the electron-impact ... More
Indistinguishable single photons with flexible electronic triggeringJan 07 2016May 06 2016A key ingredient for quantum photonic technologies is an on-demand source of indistinguishable single photons. State-of-the-art indistinguishable single-photon sources typically employ resonant excitation pulses with fixed repetition rates, creating a ... More
Polariton states bound to defects in GaAs/AlAs planar microcavitiesNov 25 2011We report on polariton states bound to defects in planar GaAs/AlAs microcavities grown by molecular beam epitaxy. The defect types relevant for the spatial polariton dynamics in these structures are cross-hatch misfit dislocations, and point-like defects ... More
Performance of a Quintuple-GEM Based RICH Detector PrototypeJan 14 2015Jun 27 2016Cerenkov technology is often the optimal choice for particle identification in high energy particle collision applications. Typically, the most challenging regime is at high pseudorapidity (forward) where particle identification must perform well at high ... More
Late-time evolution of the gravitating SkyrmionJun 23 2009We study the dynamics of spherically symmetric solutions in the Einstein Skyrme model. We focus our attention on generic long time evolution of initial data resulting in the formation of the B = 1 soliton, which plays the role of an attractor. We demonstrate ... More
Late-time tails of self-gravitating skyrmionsJan 26 2010Jan 25 2011We consider the long-time behaviour of spherically symmetric solutions in the Einstein-Skyrme model. Using nonlinear perturbation analysis we obtain the leading order estimation of the tail in the topologically trivial sector (B = 0) of the model. We ... More
Calculations for electron-impact ionization of magnesium and calcium atoms in the method of interacting configurations in the complex number representationJun 23 2017Next investigations in our program of transition from the He atom to the complex atoms description have been presented. The method of interacting configurations in the complex number representation is under consideration. The spectroscopic characteristics ... More
Spectral action for scalar perturbations of Dirac operatorsDec 17 2010We investigate the leading terms of the spectral action for odd-dimensional Riemannian spin manifolds with the Dirac operator perturbed by a scalar function. We calculate first two Gilkey-de Witt coefficients and make explicit calculations for the case ... More
Discrete Gauging in Coulomb branches of Three Dimensional $\mathcal{N}=4$ Supersymmetric Gauge TheoriesJul 09 2018Aug 15 2018This paper tests a conjecture on discrete non-Abelian gauging of 3d $\mathcal{N} = 4$ supersymmetric quiver gauge theories. Given a parent quiver with a bouquet of $n$ nodes of rank $1$, invariant under a discrete $S_n$ global symmetry, one can construct ... More
Polariton condensation in a planar microcavity with InGaAs quantum wellsJul 24 2014Polariton lattice condensates provide a platform for on chip quantum emulations. Interactions in extended polariton lattices are currently limited by the intrinsic photonic disorder of microcavities. Here, we fabricate a strain compensated planar GaAs/AlAs ... More
ZETH: On Integrating Zerocash on EthereumApr 01 2019Apr 04 2019Transaction privacy is a hard problem on an account-based blockchain such as Ethereum. While Ben-Sasson et al. presented the Zerocash protocol [BCG+14] as a decentralized anonymous payment (DAP) scheme standing on top of Bitcoin, no study about the integration ... More
Contractible polyhedra in products of trees and absolute retracts in products of dendritesFeb 03 2011Dec 07 2012We show that a compact n-polyhedron PL embeds in a product of n trees if and only if it collapses onto an (n-1)-polyhedron. If the n-polyhedron is contractible and n\ne 3 (or n=3 and the Andrews-Curtis Conjecture holds), the product of trees may be assumed ... More
Institutionalization in Efficient Markets: The Case of Price BubblesAug 23 2016We seek to deepen understanding of the micro-foundations of institutionalization while contributing to a sociological theory of markets by investigating the puzzle of price bubbles in financial markets. We find that such markets, despite textbook conditions ... More
Computer assisted proof of Shil'nikov homoclinics: with application to the Lorenz-84 modelMay 25 2016We present a methodology for computer assisted proofs of Shil'nikov homoclinic intersections. It is based on geometric bounds on the invariant manifolds using rate conditions, and on propagating the bounds by an interval arithmetic integrator. Our method ... More
Minimally Unbalanced QuiversOct 02 2018Oct 08 2018We develop a classification of \emph{minimally unbalanced} $3d~\mathcal{N}=4$ quiver gauge theories. These gauge theories are important because the isometry group $G$ of their Coulomb branch contains a single factor, which is either a classical or an ... More
Majorana neutrino mass matrix with CP symmetry breakingApr 16 2012From the new existing data with not vanishing theta13 mixing angle we determine the possible shape of the Majorana neutrino mass matrix. We assume that CP symmetry is broken and all Dirac and Majorana phases are taken into account. Two possible approaches ... More
Terahertz-based attosecond metrology of relativistic electron beamsMay 05 2018Photons, electrons, and their interplay are at the heart of photonic devices and modern instruments for ultrafast science [1-10]. Nowadays, electron beams of the highest intensity and brightness are created by photoemission with short laser pulses, and ... More
Time-monitoring Observations of the Ro-Vibrational Overtone CO bands in Young StarsJun 11 2013We present near-IR spectra of a sample of T Tauri, Herbig Ae/Be, and FU Ori objects. Using the FSPEC instrument on the Bok 90-inch telescope, we obtained K-band spectra with a resolution of ~3500. Here we present spectra of the v=2->0 and v=3->1 bandheads ... More
The Type Ia Supernova 1998bu in M96 and the Hubble ConstantJun 12 1999We present optical and near-infrared photometry and spectroscopy of the type Ia SN 1998bu in the Leo I Group galaxy M96 (NGC 3368). The data set consists of 356 photometric measurements and 29 spectra of SN 1998bu between UT 1998 May 11 and July 15. The ... More
Time-monitoring Observations of Br$γ$ Emission from Young StarsNov 19 2014We present multiple epochs of near-IR spectroscopy for a sample of 25 young stars, including T Tauri, Herbig Ae/Be, and FU Ori objects. Using the FSPEC instrument on the Bok 90-inch telescope, we obtained K-band spectra of the BrGamma transition of hydrogen, ... More
Habitability from Tidally-Induced TectonicsMar 19 2018The stability of Earth's climate on geological timescales is enabled by the carbon-silicate cycle that acts as a negative feedback mechanism stabilizing surface temperatures via the intake and outgas of atmospheric carbon. On Earth, this thermostat is ... More
A Model of Convergent Extension in Animal MorphogenesisDec 17 1999Jan 24 2000In this paper we argue that the pattern of cell movements in the morphogenetic process known as convergent extension can be understood as a energy minimization process, provided the cell-cell adhesive energy has a certain kind of anisotropy. This single ... More
Likelihood method and Fisher information in construction of physical modelsNov 21 2008The subjects of the paper are the likelihood method (LM) and the expected Fisher information (FI) considered from the point od view of the construction of the physical models which originate in the statistical description of phenomena. The master equation ... More
Late-time tails of wave maps coupled to gravityJun 16 2009We consider the late-time asymptotic behavior for solutions of Einstein's equations with the wave map matter. Solutions starting from small compactly supported $\ell$-equivariant initial data with $\ell\geq 1$ are shown to decay as $t^{-(2\ell+2)}$ at ... More
Collective Quadrupole Excitations in Transitional NucleiJun 27 2000The generalized Bohr Hamiltonian was used to describe the low-lying collective excitations in even-even isotopes of Ru, Pd, Te, Ba and Nd. The Strutinsky collective potential and cranking inertial functions were obtained using the Nilsson potential. The ... More
The low-lying quadrupole collective excitations of Ru and Pd isotopesFeb 16 1999Quadrupole excitations of even-even Ru and Pd isotopes are described within microscopic approach based on the general collective Bohr model which includes the effect of coupling with the pairing vibrations. The excitation energies and E2 transition probabilities ... More
Collective quadrupole excitations in the 50<Z,N<82 nuclei with the generalized Bohr HamiltonianMay 23 1998The generalized Bohr Hamiltonian is applied to a description of low-lying collective excitations in even-even isotopes of Te, Xe, Ba, Ce, Nd and Sm. The collective potential and inertial functions are determined by means of the Strutinsky method and the ... More
Li dynamics in carbon-rich polymer-derived SiCN ceramics probed by nuclear magnetic resonanceJan 08 2014We report $^{7}$Li, $^{29}$Si, and $^{13}$C NMR studies of two different carbon-rich SiCN ceramics SiCN-1 and SiCN-3 derived from the preceramic polymers polyphenylvinylsilylcarbodiimide and polyphenylvinylsilazane, respectively. From the spectral analysis ... More
Epsilon Aurigae: An improved spectroscopic orbital solutionJan 27 2010A rare eclipse of the mysterious object Epsilon Aurigae will occur in 2009-2011. We report an updated single-lined spectroscopic solution for the orbit of the primary star based on 20 years of monitoring at the CfA, combined with historical velocity observations ... More
Hyperon Nonleptonic Weak Decays RevisitedNov 27 2000Nov 29 2000We first review the current algebra - PCAC approach to nonleptonic octet baryon 14 weak decay B (\to) (B^{\prime})(\pi) amplitudes. The needed four parameters are independently determined by (\Omega \to \Xi \pi),(\Lambda K) and (\Xi ^{-}\to \Sigma ^{-}\gamma) ... More
Halting Planetary MigrationNov 19 1999Jan 05 2000When Jupiter's Roche Lobe radius exceeded the scale height of the protoplanetary disk, Jupiter opened a gap in the disk. When the gap was wide enough, tidal torques from the disk interior and exterior to Jupiter were suppressed and migration continued ... More
Transport spectroscopy of disordered graphene quantum dots etched into a single graphene flakeJul 30 2013We present transport measurements on quantum dots of sizes 45, 60 and 80 nm etched with an Ar/O2-plasma into a single graphene sheet, allowing a size comparison avoiding effects from different graphene flakes. The transport gaps and addition energies ... More
Magnetic field of a neutron star with color superconducting quark matter coreMay 10 2002The behaviour of the magnetic field of a neutron star with a superconducting quark matter core is investigated in the framework of the Ginzburg-Landau theory. We take into account the simultaneous coupling of the diquark condensate field to the usual ... More
Germanium Detector Response to Nuclear Recoils in Searching for Dark MatterMar 20 2012Aug 22 2012The discrepancies in claims of experimental evidence in the search for weakly interacting massive particle (WIMP) dark matter necessitate a model for ionization efficiency (the quenching factor) at energies below 10 keV. We have carefully studied the ... More
Dispersing the Gaseous Protoplanetary Disc and Halting Type II MigrationJun 28 2003More than 30 extra-solar Jupiter-like planets have shorter periods than the planet Mercury. It is generally accepted that they formed further out, and migrated inwards. In order to be driven by tidal torques from the gaseous disc, the disc exterior to ... More
On the Snow Line in Dusty Protoplanetary DisksNov 19 1999The snow line, in Hayashi's (1981) model, is where the temperature of a black body that absorbed direct sunlight and re-radiated as much as it absorbed, would be 170~K. It is usually assumed that the cores of the giant planets, e.g., Jupiter, form beyond ... More
Nilpotent Groups are RoundNov 11 2009We define a notion of roundness for finite groups. Roughly speaking, a group is round if one can order its elements in a cycle in such a way that some natural summation operators map this cycle into new cycles containing all the elements of the group. ... More
Chiral symmetry breaking via constituent quarks for qbarq pseudoscalar mesonsJul 18 2005We base our chiral symmetry approach on the quark-level linear sigma model Lagrangian. Then we review the Nambu--Goldstone theorem with vanishing pi, K, eta_8 masses. Next we dynamically generate the pi, K, eta_8 masses away from the chiral limit. Then ... More
Shape of Mixed Micelles: Cylinders or Spheres? Theoretical AnalysisMar 21 1998We develop a theoretical model for the solubilization of phospholipid bilayers by micelle-forming surfactants. Cylindrical micelles, disc-like micelles and spherical micelles are considered as alternative resultant structures. The main question addressed ... More
Classical Boundary-value Problem in Riemannian Quantum Gravity and Self-dual Taub-NUT-(anti)de Sitter GeometriesFeb 21 2002Dec 03 2002The classical boundary-value problem of the Einstein field equations is studied with an arbitrary cosmological constant, in the case of a compact ($S^{3}$) boundary given a biaxial Bianchi-IX positive-definite three-metric, specified by two radii $(a,b).$ ... More
High-field optically detected nuclear magnetic resonance in GaAsJan 26 2005A method for high-field optically detected nuclear magnetic resonance (ODNMR) is developed sensitive to 10**8 nuclei. Nuclear spin transitions are induced using a radio frequency coil and detected through Faraday rotation spectroscopy. Unlike conventional ... More
Simulating Organogenesis in COMSOL: Tissue MechanicsOct 02 2017Oct 19 2017During growth, tissue expands and deforms. Given its elastic properties, stresses emerge in an expanding and deforming tissue. Cell rearrangements can dissipate these stresses and numerous experiments confirm the viscoelastic properties of tissues [1]-[4]. ... More
Fermi-Bose mapping and N-particle ground state of spin-polarized fermions in tight atom waveguidesSep 17 2003A K-matrix for waveguide confined spin-polarized fermionic atoms recently computed by Granger and Blume is identified, in the low-energy domain, with a contact condition for one-dimensional (1D) spinless fermions. Difficulties in consistently formulating ... More
Quantum memory for photons: I. Dark state polaritonsJun 12 2001Jun 27 2001An ideal and reversible transfer technique for the quantum state between light and metastable collective states of matter is presented and analyzed in detail. The method is based on the control of photon propagation in coherently driven 3-level atomic ... More
Circumventing the axial anomalies and the strong CP problemMar 15 2005Dec 12 2005Many meson processes are related to the U_A(1) axial anomaly, present in the Feynman graphs where fermion loops connect axial vertices with vector vertices. However, the coupling of pseudoscalar mesons to quarks does not have to be formulated via axial ... More
Bypassing the axial anomaliesDec 09 2005Many meson processes are related to the U_A(1) axial anomaly, present in the Feynman graphs where fermion loops connect axial vertices with vector vertices. However, the coupling of pseudoscalar mesons to quarks does not have to be formulated via axial ... More
Scaling and width distributions of parity conserving interfacesSep 20 2013Nov 28 2013We present an alternative finite-size approach to a set of parity conserving interfaces involving attachment, dissociation, and detachment of extended objects in 1+1 dimensions. With the aid of a nonlocal construct introduced by Barma and Dhar in related ... More
Theory and Phenomenology of Mixed Amphiphilic AggregatesMar 21 1998We give a short overview of existing approaches describing shapes and energetics of amphiphilic aggregates. In particular, we consider recent experimental data and theory in relation to mixed aggregates. We point out the outstanding questions deserving ... More
Spectral properties of the Holstein double-exchange model and application to manganitesNov 09 2001Jun 18 2002Calculations of one-electron spectral functions, optical conductivity and spin-wave energy in the Holstein double-exchange model are made using the many-body coherent potential approximation. Satisfactory agreement is obtained with angle-resolved photoemission ... More
Excitation of non-radial stellar oscillations by gravitational waves: a first modelJun 24 2010Oct 17 2010The excitation of solar and solar-like g modes in non-relativistic stars by arbitrary external gravitational wave fields is studied starting from the full field equations of general relativity. We develop a formalism that yields the mean-square amplitudes ... More
Spontaneous symmetry breaking with Wilson renormalization groupJul 19 1995We study the conditions under which a symmetry is spontaneously broken in the Wilson renormalization group formulation. Both for a global and local symmetry, the result is that in perturbation theory one has to perform a fine tuning of the boundary conditions ... More
Excitation of stellar oscillations by gravitational waves: hydrodynamic model and numerical results for the SunMar 02 2011Starting from a general relativistic framework a hydrodynamic formalism is derived that yields the mean-square amplitudes and rms surface velocities of normal modes of non-relativistic stars excited by arbitrary gravitational wave (GW) radiation. In particular, ... More
A non cool-core 4.6-keV cluster around the bright nearby radio galaxy PKS B1416-493Feb 02 2017We present new X-ray (Chandra) and radio (ATCA) observations of the z=0.09 radio galaxy PKS B1416-493, a member of the southern equivalent of the 3CRR sample. We find the source to be embedded in a previously unrecognized bright kT=4.6 keV non cool-core ... More
X-ray synchrotron emission from the oblique shock in the jet of the powerful radio galaxy 3C 346Apr 06 2005We report the first detection, with Chandra, of X-ray emission from the jet of the powerful narrow-line radio galaxy 3C 346. X-rays are detected from the bright radio and optical knot at which the jet apparently bends by about 70 degrees. The Chandra ... More
Multiwavelength evidence of the physical processes in radio jetsOct 12 2004Jun 08 2018Over the last few years, high-quality X-ray imaging and spectroscopic data from Chandra and XMM-Newton have added greatly to the understanding of the physics of radio jets. Here we describe the current state of knowledge with an emphasis on the underlying ... More
The temperature and distribution of gas in CL 0016+16 measured with XMM-NewtonJan 07 2003We present results of a 37 ks observation of CL 0016+16 with the XMM-Newton EPIC instrument. Within 1.5 arcmin of the cluster centre we measure a gas temperature of kT = 9.13^{+0.24}_{-0.22} keV and an abundance of 0.22^{+0.04}_{-0.03} times the solar ... More
The X-ray emission of 3C 346 and its environmentDec 15 2000We present a detailed spectral and spatial analysis of the X-ray properties of the compact and unusual radio galaxy 3C 346, combining information from ROSAT and ASCA. The dominant component of X-ray emission (~ 10^44 ergs/s in each of the 0.5-3 keV and ... More
Models of a protoplanetary disk forming in-situ the Galilean and smaller nearby satellites before Jupiter is fully formedJan 16 2019We fit an isothermal oscillatory density model of Jupiter's protoplanetary disk to the present-day Galilean and other nearby satellites and we determine the radial scale length of the disk, the equation of state and the central density of the primordial ... More
A new approach to Naturalness in SUSY modelsApr 03 2013Apr 29 2013We review recent results that provide a new approach to the old problem of naturalness in supersymmetric models, without relying on subjective definitions for the fine-tuning associated with {\it fixing} the EW scale (to its measured value) in the presence ... More
The longitudinal structure function of the proton for small xMar 04 2002A comparison of the H1 data on the longitudinal structure function, $F_L$, at small $x$ with the predictions from the generalized vector dominance / color dipole picture (GVD/CDP) is presented. Using the set of parameters previously determined in the ... More
K-ImplementationJun 30 2011This paper discusses an interested party who wishes to influence the behavior of agents in a game (multi-agent interaction), which is not under his control. The interested party cannot design a new game, cannot enforce agents' behavior, cannot enforce ... More
Dynamic Non-Bayesian Decision MakingNov 01 1997The model of a non-Bayesian agent who faces a repeated game with incomplete information against Nature is an appropriate tool for modeling general agent-environment interactions. In such a model the environment state (controlled by Nature) may change ... More
Antimatter Bounds by Anti-Asteroids annihilations on Planets and SunSep 14 2001Jul 19 2002The existence of antimatter stars in the Galaxy as possible signature for inflationary models with non-homogeneous baryo-synthesis may leave the trace by antimatter cosmic rays as well as by their secondaries (anti-planets and anti-meteorites) diffused ... More
The Properties of High Redshift GalaxiesDec 04 2000In recent years, a variety of techniques at optical, near-infrared, sub-mm, and radio wavelengths have opened complementary windows on the high-redshift Universe. Here we review the current understanding of the general properties of the z>~2 galaxies ... More
Anisotropy of spin coherence in high mobility quantum wells with arbitrary magnetic fieldsMay 11 2016Sep 14 2016We present a theoretical study of the anisotropy of the spin relaxation and decoherence in typical quantum wells with an arbitrary magnetic field. In such systems, the orientation of the magnetic field relative to the main crystallographic directions ... More
Estimation of the regression slope by means of Gini's cograduation indexNov 18 2014The simple linear model $$Y_i = \alpha + \beta \, x_i + \epsilon_i \qquad i=1,2, \ldots,N \geq 2$$ is considered, where the $x_i$'s are given constants and $\epsilon_1, \epsilon_2 , \ldots, \epsilon_N$ are iid with continuous distribution function $F$. ... More
Revisiting the T2K data using different models for the neutrino-nucleus cross sectionsMar 15 2012Sep 19 2012We present a three-flavour fit to the recent \nu\mu --> \nu e and \nu\mu --> \nu\mu T2K oscillation data with different models for the neutrino-nucleus cross section. We show that, even for a limited statistics, the allowed regions and best fit points ... More
Continuum time limit and stationary states of the Minority GameFeb 14 2001Jul 03 2001We discuss in detail the derivation of stochastic differential equations for the continuum time limit of the Minority Game. We show that all properties of the Minority Game can be understood by a careful theoretical analysis of such equations. In particular, ... More
Discovery of ultra-steep spectrum giant radio galaxy with recurrent radio jet activity in Abell 449Feb 09 2016We report a discovery of a 1.3 Mpc diffuse radio source with extremely steep spectrum fading radio structures in the vicinity of the Abell 449 cluster of galaxies. Its extended diffuse lobes are bright only at low radio frequencies and their synchrotron ... More
Recent Results on the Bc MesonJun 24 2005The pseudoscalar meson B_c is the lowest mass bound state of the (c b-bar) and the charge conjugate. It is the last such meson to be discovered. Both the CDF and D0 collaborations have reported recent results on the mass and lifetime of this elusive state. ... More
Stationary quantum source codingDec 22 1999Mar 09 2001In this paper the quantum source coding theorem is obtained for a completely ergodic source. This results extends Shannon's classical theorem as well as Schumacher's quantum noiseless coding theorem for memoryless sources. The control of the memory effects ... More
Review of Neutrino Oscllations ExperimentsJun 05 2006Several experiments have sought evidence for neutrino mass and mixing via the phenomenon of neutrino flavor oscillations. In a three neutrino model, these oscillations are described by three angles, two mass splittings, and one CP violating phase. Experiments ... More
Being at RestOct 29 2001As a subject, an observer is fundamentally at rest in a reference frame, and this being at rest allows for measuring the motion of physical objects. Exploring the experience of centrifugal force brings to the fore the natural inclination to see oneself ... More
Dark MatterAug 08 1999Aug 18 1999Gravitational force manifested in its affect on rotational velocity is what indicates the presence of dark matter in individual galaxies. Newtonian mechanics is generally used to derive the relationship between rotational velocity and gravitational force. ... More
Combining Research Methods and Results from Psychology and Physics in the Investigation of Quantum MechanicsJun 18 2000Research methods and results from physics and psychology are used to explore a question in quantum mechanics. In this investigation, an observer variable is manipulated in an experimental context concerning the trajectory of electrons affected by their ... More
On the Arbitrary Choice Regarding which Inertial Reference Frame is "Stationary" and which is "Moving" in the Special Theory of RelativityMay 28 2000Einstein's argument on the relativity of simultaneity itself is the first result of the special theory of relativity. The nature of this result is explored, and implications of this result for the structure and functioning of the physical world found ... More
Theory of Semi-Instantiation in Abstract ArgumentationApr 27 2015We study instantiated abstract argumentation frames of the form $(S,R,I)$, where $(S,R)$ is an abstract argumentation frame and where the arguments $x$ of $S$ are instantiated by $I(x)$ as well formed formulas of a well known logic, for example as Boolean ... More
Topological Quantum Groups, Star Products and their relationsSep 10 1994This short summary of recent developments in quantum compact groups and star products is divided into 2 parts. In the first one we recast star products in a more abstract form as deformations and review its recent developments. The second part starts ... More
Violent Relaxation in Hierarchical ClusteringFeb 05 1996The term ``violent relaxation'' was coined by Donald Lynden-Bell as a memorable oxymoron describing how a stellar dynamical system relaxes from a chaotic initial state to a quasi-equilibrium. His analysis showed that this process is rapid, even for systems ... More
Time Interval OperatorsApr 16 2001Apr 20 2001In this work we will advance farther along a line previously developed concerning our proposal of a time interval operator, on finite dimensional spaces. The time interval operator is Hermitian, and its eigenvalues are time values with a precise and interesting ... More
Magnetic dipole moment of the $Δ^+$(1232) from the $γp \to γπ^0 p$ reactionMay 07 2001The $\gamma p \to \gamma \pi^0 p$ reaction in the $\Delta(1232)$-resonance region is investigated as a method to access the $\Delta^+(1232)$ magnetic dipole moment. The calculations are performed within the context of an effective Lagrangian model containing ... More
The Optical Variability of the Quasar 3C~279: The Signature of a Decelerating Jet?Nov 03 2008A recent optical monitoring campaign on the prominent quasar 3C279 revealed a period of a remarkably clean exponential decay of BVRI fluxes with time, with a time constant of 12.8 d, over about 14 days. This is clearly too long to be associated with radiative ... More
Geometrical measures of non-Gaussianity generated from single field Inflationary modelsJun 03 2015Aug 18 2015We have calculated the third order moments of scalar curvature perturbations in configuration space for different inflationary models. We developed a robust numerical technique to compute the bispectrum for different models that have some features in ... More
Cosmology and Gravitation: Summary talk at the XXIV Brazilian Meeting on Particles and FieldsApr 06 2004This is a brief summary with comments on selected contributions to the Cosmology and Gravitation section at the $24^{th}$ Brazilian Meeting on Particle and Fields (ENFPC XXIV), held at Caxambu, from September 30 to October 4, 2003.
Gravitational Waves from Coalescing Binary SourcesJul 08 2010Coalescing binary systems (eg pulsars, neutron stars and black holes) are the most likely sources of gravitational radiation, yet to be detected on or near Earth, where the local gravitational field is negligible and the Poincar\'e symmetry rules. On ... More